/******************************************************************************* This file is part of LibTMCG. [CS00] Ronald Cramer, Victor Shoup: 'Signature schemes based on the strong RSA assumption', ACM Transactions on Information and System Security, Vol.3(3), pp. 161--185, 2000 [RS00] Jean-Francois Raymond, Anton Stiglic: 'Security Issues in the Diffie-Hellman Key Agreement Protocol', ZKS technical report http://citeseer.ist.psu.edu/455251.html [HAC] Alfred J. Menezes, Paul C. van Oorschot, and Scott A. Vanstone: 'Handbook of Applied Cryptography', CRC Press, 1996. Copyright (C) 2004, 2005, 2006, 2016, 2017, 2018, 2019 Heiko Stamer LibTMCG is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. LibTMCG is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with LibTMCG; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. *******************************************************************************/ // include headers #ifdef HAVE_CONFIG_H #include "libTMCG_config.h" #endif #include "mpz_sprime.hh" // additional headers #include #include #include #include #include "mpz_srandom.hh" #define PRIMES 668 #define MPRIMES 7836 #define SIEVE_SIZE 16 unsigned long int primes[] = { 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997, 1009, 1013, 1019, 1021, 1031, 1033, 1039, 1049, 1051, 1061, 1063, 1069, 1087, 1091, 1093, 1097, 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163, 1171, 1181, 1187, 1193, 1201, 1213, 1217, 1223, 1229, 1231, 1237, 1249, 1259, 1277, 1279, 1283, 1289, 1291, 1297, 1301, 1303, 1307, 1319, 1321, 1327, 1361, 1367, 1373, 1381, 1399, 1409, 1423, 1427, 1429, 1433, 1439, 1447, 1451, 1453, 1459, 1471, 1481, 1483, 1487, 1489, 1493, 1499, 1511, 1523, 1531, 1543, 1549, 1553, 1559, 1567, 1571, 1579, 1583, 1597, 1601, 1607, 1609, 1613, 1619, 1621, 1627, 1637, 1657, 1663, 1667, 1669, 1693, 1697, 1699, 1709, 1721, 1723, 1733, 1741, 1747, 1753, 1759, 1777, 1783, 1787, 1789, 1801, 1811, 1823, 1831, 1847, 1861, 1867, 1871, 1873, 1877, 1879, 1889, 1901, 1907, 1913, 1931, 1933, 1949, 1951, 1973, 1979, 1987, 1993, 1997, 1999, 2003, 2011, 2017, 2027, 2029, 2039, 2053, 2063, 2069, 2081, 2083, 2087, 2089, 2099, 2111, 2113, 2129, 2131, 2137, 2141, 2143, 2153, 2161, 2179, 2203, 2207, 2213, 2221, 2237, 2239, 2243, 2251, 2267, 2269, 2273, 2281, 2287, 2293, 2297, 2309, 2311, 2333, 2339, 2341, 2347, 2351, 2357, 2371, 2377, 2381, 2383, 2389, 2393, 2399, 2411, 2417, 2423, 2437, 2441, 2447, 2459, 2467, 2473, 2477, 2503, 2521, 2531, 2539, 2543, 2549, 2551, 2557, 2579, 2591, 2593, 2609, 2617, 2621, 2633, 2647, 2657, 2659, 2663, 2671, 2677, 2683, 2687, 2689, 2693, 2699, 2707, 2711, 2713, 2719, 2729, 2731, 2741, 2749, 2753, 2767, 2777, 2789, 2791, 2797, 2801, 2803, 2819, 2833, 2837, 2843, 2851, 2857, 2861, 2879, 2887, 2897, 2903, 2909, 2917, 2927, 2939, 2953, 2957, 2963, 2969, 2971, 2999, 3001, 3011, 3019, 3023, 3037, 3041, 3049, 3061, 3067, 3079, 3083, 3089, 3109, 3119, 3121, 3137, 3163, 3167, 3169, 3181, 3187, 3191, 3203, 3209, 3217, 3221, 3229, 3251, 3253, 3257, 3259, 3271, 3299, 3301, 3307, 3313, 3319, 3323, 3329, 3331, 3343, 3347, 3359, 3361, 3371, 3373, 3389, 3391, 3407, 3413, 3433, 3449, 3457, 3461, 3463, 3467, 3469, 3491, 3499, 3511, 3517, 3527, 3529, 3533, 3539, 3541, 3547, 3557, 3559, 3571, 3581, 3583, 3593, 3607, 3613, 3617, 3623, 3631, 3637, 3643, 3659, 3671, 3673, 3677, 3691, 3697, 3701, 3709, 3719, 3727, 3733, 3739, 3761, 3767, 3769, 3779, 3793, 3797, 3803, 3821, 3823, 3833, 3847, 3851, 3853, 3863, 3877, 3881, 3889, 3907, 3911, 3917, 3919, 3923, 3929, 3931, 3943, 3947, 3967, 3989, 4001, 4003, 4007, 4013, 4019, 4021, 4027, 4049, 4051, 4057, 4073, 4079, 4091, 4093, 4099, 4111, 4127, 4129, 4133, 4139, 4153, 4157, 4159, 4177, 4201, 4211, 4217, 4219, 4229, 4231, 4241, 4243, 4253, 4259, 4261, 4271, 4273, 4283, 4289, 4297, 4327, 4337, 4339, 4349, 4357, 4363, 4373, 4391, 4397, 4409, 4421, 4423, 4441, 4447, 4451, 4457, 4463, 4481, 4483, 4493, 4507, 4513, 4517, 4519, 4523, 4547, 4549, 4561, 4567, 4583, 4591, 4597, 4603, 4621, 4637, 4639, 4643, 4649, 4651, 4657, 4663, 4673, 4679, 4691, 4703, 4721, 4723, 4729, 4733, 4751, 4759, 4783, 4787, 4789, 4793, 4799, 4801, 4813, 4817, 4831, 4861, 4871, 4877, 4889, 4903, 4909, 4919, 4931, 4933, 4937, 4943, 4951, 4957, 4967, 4969, 4973, 4987, 4993, 4999, 5003, 5009, 5011, 5021, 5023, 5039, 5051, 5059, 5077, 5081, 5087, 5099, 5101, 5107, 5113, 5119, 5147, 5153, 5167, 5171, 5179, 5189, 5197, 5209, 5227, 5231, 5233, 5237, 5261, 5273, 5279, 5281, 5297, 5303, 5309, 5323, 5333, 5347, 5351, 5381, 5387, 5393, 5399, 5407, 5413, 5417, 5419, 5431, 5437, 5441, 5443, 5449, 5471, 5477, 5479, 5483, 5501, 5503, 5507, 5519, 5521, 5527, 5531, 5557, 5563, 5569, 5573, 5581, 5591, 5623, 5639, 5641, 5647, 5651, 5653, 5657, 5659, 5669, 5683, 5689, 5693, 5701, 5711, 5717, 5737, 5741, 5743, 5749, 5779, 5783, 5791, 5801, 5807, 5813, 5821, 5827, 5839, 5843, 5849, 5851, 5857, 5861, 5867, 5869, 5879, 5881, 5897, 5903, 5923, 5927, 5939, 5953, 5981, 5987, 6007, 6011, 6029, 6037, 6043, 6047, 6053, 6067, 6073, 6079, 6089, 6091, 6101, 6113, 6121, 6131, 6133, 6143, 6151, 6163, 6173, 6197, 6199, 6203, 6211, 6217, 6221, 6229, 6247, 6257, 6263, 6269, 6271, 6277, 6287, 6299, 6301, 6311, 6317, 6323, 6329, 6337, 6343, 6353, 6359, 6361, 6367, 6373, 6379, 6389, 6397, 6421, 6427, 6449, 6451, 6469, 6473, 6481, 6491, 6521, 6529, 6547, 6551, 6553, 6563, 6569, 6571, 6577, 6581, 6599, 6607, 6619, 6637, 6653, 6659, 6661, 6673, 6679, 6689, 6691, 6701, 6703, 6709, 6719, 6733, 6737, 6761, 6763, 6779, 6781, 6791, 6793, 6803, 6823, 6827, 6829, 6833, 6841, 6857, 6863, 6869, 6871, 6883, 6899, 6907, 6911, 6917, 6947, 6949, 6959, 6961, 6967, 6971, 6977, 6983, 6991, 6997, 7001, 7013, 7019, 7027, 7039, 7043, 7057, 7069, 7079, 7103, 7109, 7121, 7127, 7129, 7151, 7159, 7177, 7187, 7193, 7207, 7211, 7213, 7219, 7229, 7237, 7243, 7247, 7253, 7283, 7297, 7307, 7309, 7321, 7331, 7333, 7349, 7351, 7369, 7393, 7411, 7417, 7433, 7451, 7457, 7459, 7477, 7481, 7487, 7489, 7499, 7507, 7517, 7523, 7529, 7537, 7541, 7547, 7549, 7559, 7561, 7573, 7577, 7583, 7589, 7591, 7603, 7607, 7621, 7639, 7643, 7649, 7669, 7673, 7681, 7687, 7691, 7699, 7703, 7717, 7723, 7727, 7741, 7753, 7757, 7759, 7789, 7793, 7817, 7823, 7829, 7841, 7853, 7867, 7873, 7877, 7879, 7883, 7901, 7907, 7919, 7927, 7933, 7937, 7949, 7951, 7963, 7993, 8009, 8011, 8017, 8039, 8053, 8059, 8069, 8081, 8087, 8089, 8093, 8101, 8111, 8117, 8123, 8147, 8161, 8167, 8171, 8179, 8191, 8209, 8219, 8221, 8231, 8233, 8237, 8243, 8263, 8269, 8273, 8287, 8291, 8293, 8297, 8311, 8317, 8329, 8353, 8363, 8369, 8377, 8387, 8389, 8419, 8423, 8429, 8431, 8443, 8447, 8461, 8467, 8501, 8513, 8521, 8527, 8537, 8539, 8543, 8563, 8573, 8581, 8597, 8599, 8609, 8623, 8627, 8629, 8641, 8647, 8663, 8669, 8677, 8681, 8689, 8693, 8699, 8707, 8713, 8719, 8731, 8737, 8741, 8747, 8753, 8761, 8779, 8783, 8803, 8807, 8819, 8821, 8831, 8837, 8839, 8849, 8861, 8863, 8867, 8887, 8893, 8923, 8929, 8933, 8941, 8951, 8963, 8969, 8971, 8999, 9001, 9007, 9011, 9013, 9029, 9041, 9043, 9049, 9059, 9067, 9091, 9103, 9109, 9127, 9133, 9137, 9151, 9157, 9161, 9173, 9181, 9187, 9199, 9203, 9209, 9221, 9227, 9239, 9241, 9257, 9277, 9281, 9283, 9293, 9311, 9319, 9323, 9337, 9341, 9343, 9349, 9371, 9377, 9391, 9397, 9403, 9413, 9419, 9421, 9431, 9433, 9437, 9439, 9461, 9463, 9467, 9473, 9479, 9491, 9497, 9511, 9521, 9533, 9539, 9547, 9551, 9587, 9601, 9613, 9619, 9623, 9629, 9631, 9643, 9649, 9661, 9677, 9679, 9689, 9697, 9719, 9721, 9733, 9739, 9743, 9749, 9767, 9769, 9781, 9787, 9791, 9803, 9811, 9817, 9829, 9833, 9839, 9851, 9857, 9859, 9871, 9883, 9887, 9901, 9907, 9923, 9929, 9931, 9941, 9949, 9967, 9973, 10007, 10009, 10037, 10039, 10061, 10067, 10069, 10079, 10091, 10093, 10099, 10103, 10111, 10133, 10139, 10141, 10151, 10159, 10163, 10169, 10177, 10181, 10193, 10211, 10223, 10243, 10247, 10253, 10259, 10267, 10271, 10273, 10289, 10301, 10303, 10313, 10321, 10331, 10333, 10337, 10343, 10357, 10369, 10391, 10399, 10427, 10429, 10433, 10453, 10457, 10459, 10463, 10477, 10487, 10499, 10501, 10513, 10529, 10531, 10559, 10567, 10589, 10597, 10601, 10607, 10613, 10627, 10631, 10639, 10651, 10657, 10663, 10667, 10687, 10691, 10709, 10711, 10723, 10729, 10733, 10739, 10753, 10771, 10781, 10789, 10799, 10831, 10837, 10847, 10853, 10859, 10861, 10867, 10883, 10889, 10891, 10903, 10909, 10937, 10939, 10949, 10957, 10973, 10979, 10987, 10993, 11003, 11027, 11047, 11057, 11059, 11069, 11071, 11083, 11087, 11093, 11113, 11117, 11119, 11131, 11149, 11159, 11161, 11171, 11173, 11177, 11197, 11213, 11239, 11243, 11251, 11257, 11261, 11273, 11279, 11287, 11299, 11311, 11317, 11321, 11329, 11351, 11353, 11369, 11383, 11393, 11399, 11411, 11423, 11437, 11443, 11447, 11467, 11471, 11483, 11489, 11491, 11497, 11503, 11519, 11527, 11549, 11551, 11579, 11587, 11593, 11597, 11617, 11621, 11633, 11657, 11677, 11681, 11689, 11699, 11701, 11717, 11719, 11731, 11743, 11777, 11779, 11783, 11789, 11801, 11807, 11813, 11821, 11827, 11831, 11833, 11839, 11863, 11867, 11887, 11897, 11903, 11909, 11923, 11927, 11933, 11939, 11941, 11953, 11959, 11969, 11971, 11981, 11987, 12007, 12011, 12037, 12041, 12043, 12049, 12071, 12073, 12097, 12101, 12107, 12109, 12113, 12119, 12143, 12149, 12157, 12161, 12163, 12197, 12203, 12211, 12227, 12239, 12241, 12251, 12253, 12263, 12269, 12277, 12281, 12289, 12301, 12323, 12329, 12343, 12347, 12373, 12377, 12379, 12391, 12401, 12409, 12413, 12421, 12433, 12437, 12451, 12457, 12473, 12479, 12487, 12491, 12497, 12503, 12511, 12517, 12527, 12539, 12541, 12547, 12553, 12569, 12577, 12583, 12589, 12601, 12611, 12613, 12619, 12637, 12641, 12647, 12653, 12659, 12671, 12689, 12697, 12703, 12713, 12721, 12739, 12743, 12757, 12763, 12781, 12791, 12799, 12809, 12821, 12823, 12829, 12841, 12853, 12889, 12893, 12899, 12907, 12911, 12917, 12919, 12923, 12941, 12953, 12959, 12967, 12973, 12979, 12983, 13001, 13003, 13007, 13009, 13033, 13037, 13043, 13049, 13063, 13093, 13099, 13103, 13109, 13121, 13127, 13147, 13151, 13159, 13163, 13171, 13177, 13183, 13187, 13217, 13219, 13229, 13241, 13249, 13259, 13267, 13291, 13297, 13309, 13313, 13327, 13331, 13337, 13339, 13367, 13381, 13397, 13399, 13411, 13417, 13421, 13441, 13451, 13457, 13463, 13469, 13477, 13487, 13499, 13513, 13523, 13537, 13553, 13567, 13577, 13591, 13597, 13613, 13619, 13627, 13633, 13649, 13669, 13679, 13681, 13687, 13691, 13693, 13697, 13709, 13711, 13721, 13723, 13729, 13751, 13757, 13759, 13763, 13781, 13789, 13799, 13807, 13829, 13831, 13841, 13859, 13873, 13877, 13879, 13883, 13901, 13903, 13907, 13913, 13921, 13931, 13933, 13963, 13967, 13997, 13999, 14009, 14011, 14029, 14033, 14051, 14057, 14071, 14081, 14083, 14087, 14107, 14143, 14149, 14153, 14159, 14173, 14177, 14197, 14207, 14221, 14243, 14249, 14251, 14281, 14293, 14303, 14321, 14323, 14327, 14341, 14347, 14369, 14387, 14389, 14401, 14407, 14411, 14419, 14423, 14431, 14437, 14447, 14449, 14461, 14479, 14489, 14503, 14519, 14533, 14537, 14543, 14549, 14551, 14557, 14561, 14563, 14591, 14593, 14621, 14627, 14629, 14633, 14639, 14653, 14657, 14669, 14683, 14699, 14713, 14717, 14723, 14731, 14737, 14741, 14747, 14753, 14759, 14767, 14771, 14779, 14783, 14797, 14813, 14821, 14827, 14831, 14843, 14851, 14867, 14869, 14879, 14887, 14891, 14897, 14923, 14929, 14939, 14947, 14951, 14957, 14969, 14983, 15013, 15017, 15031, 15053, 15061, 15073, 15077, 15083, 15091, 15101, 15107, 15121, 15131, 15137, 15139, 15149, 15161, 15173, 15187, 15193, 15199, 15217, 15227, 15233, 15241, 15259, 15263, 15269, 15271, 15277, 15287, 15289, 15299, 15307, 15313, 15319, 15329, 15331, 15349, 15359, 15361, 15373, 15377, 15383, 15391, 15401, 15413, 15427, 15439, 15443, 15451, 15461, 15467, 15473, 15493, 15497, 15511, 15527, 15541, 15551, 15559, 15569, 15581, 15583, 15601, 15607, 15619, 15629, 15641, 15643, 15647, 15649, 15661, 15667, 15671, 15679, 15683, 15727, 15731, 15733, 15737, 15739, 15749, 15761, 15767, 15773, 15787, 15791, 15797, 15803, 15809, 15817, 15823, 15859, 15877, 15881, 15887, 15889, 15901, 15907, 15913, 15919, 15923, 15937, 15959, 15971, 15973, 15991, 16001, 16007, 16033, 16057, 16061, 16063, 16067, 16069, 16073, 16087, 16091, 16097, 16103, 16111, 16127, 16139, 16141, 16183, 16187, 16189, 16193, 16217, 16223, 16229, 16231, 16249, 16253, 16267, 16273, 16301, 16319, 16333, 16339, 16349, 16361, 16363, 16369, 16381, 16411, 16417, 16421, 16427, 16433, 16447, 16451, 16453, 16477, 16481, 16487, 16493, 16519, 16529, 16547, 16553, 16561, 16567, 16573, 16603, 16607, 16619, 16631, 16633, 16649, 16651, 16657, 16661, 16673, 16691, 16693, 16699, 16703, 16729, 16741, 16747, 16759, 16763, 16787, 16811, 16823, 16829, 16831, 16843, 16871, 16879, 16883, 16889, 16901, 16903, 16921, 16927, 16931, 16937, 16943, 16963, 16979, 16981, 16987, 16993, 17011, 17021, 17027, 17029, 17033, 17041, 17047, 17053, 17077, 17093, 17099, 17107, 17117, 17123, 17137, 17159, 17167, 17183, 17189, 17191, 17203, 17207, 17209, 17231, 17239, 17257, 17291, 17293, 17299, 17317, 17321, 17327, 17333, 17341, 17351, 17359, 17377, 17383, 17387, 17389, 17393, 17401, 17417, 17419, 17431, 17443, 17449, 17467, 17471, 17477, 17483, 17489, 17491, 17497, 17509, 17519, 17539, 17551, 17569, 17573, 17579, 17581, 17597, 17599, 17609, 17623, 17627, 17657, 17659, 17669, 17681, 17683, 17707, 17713, 17729, 17737, 17747, 17749, 17761, 17783, 17789, 17791, 17807, 17827, 17837, 17839, 17851, 17863, 17881, 17891, 17903, 17909, 17911, 17921, 17923, 17929, 17939, 17957, 17959, 17971, 17977, 17981, 17987, 17989, 18013, 18041, 18043, 18047, 18049, 18059, 18061, 18077, 18089, 18097, 18119, 18121, 18127, 18131, 18133, 18143, 18149, 18169, 18181, 18191, 18199, 18211, 18217, 18223, 18229, 18233, 18251, 18253, 18257, 18269, 18287, 18289, 18301, 18307, 18311, 18313, 18329, 18341, 18353, 18367, 18371, 18379, 18397, 18401, 18413, 18427, 18433, 18439, 18443, 18451, 18457, 18461, 18481, 18493, 18503, 18517, 18521, 18523, 18539, 18541, 18553, 18583, 18587, 18593, 18617, 18637, 18661, 18671, 18679, 18691, 18701, 18713, 18719, 18731, 18743, 18749, 18757, 18773, 18787, 18793, 18797, 18803, 18839, 18859, 18869, 18899, 18911, 18913, 18917, 18919, 18947, 18959, 18973, 18979, 19001, 19009, 19013, 19031, 19037, 19051, 19069, 19073, 19079, 19081, 19087, 19121, 19139, 19141, 19157, 19163, 19181, 19183, 19207, 19211, 19213, 19219, 19231, 19237, 19249, 19259, 19267, 19273, 19289, 19301, 19309, 19319, 19333, 19373, 19379, 19381, 19387, 19391, 19403, 19417, 19421, 19423, 19427, 19429, 19433, 19441, 19447, 19457, 19463, 19469, 19471, 19477, 19483, 19489, 19501, 19507, 19531, 19541, 19543, 19553, 19559, 19571, 19577, 19583, 19597, 19603, 19609, 19661, 19681, 19687, 19697, 19699, 19709, 19717, 19727, 19739, 19751, 19753, 19759, 19763, 19777, 19793, 19801, 19813, 19819, 19841, 19843, 19853, 19861, 19867, 19889, 19891, 19913, 19919, 19927, 19937, 19949, 19961, 19963, 19973, 19979, 19991, 19993, 19997, 20011, 20021, 20023, 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68863, 68879, 68881, 68891, 68897, 68899, 68903, 68909, 68917, 68927, 68947, 68963, 68993, 69001, 69011, 69019, 69029, 69031, 69061, 69067, 69073, 69109, 69119, 69127, 69143, 69149, 69151, 69163, 69191, 69193, 69197, 69203, 69221, 69233, 69239, 69247, 69257, 69259, 69263, 69313, 69317, 69337, 69341, 69371, 69379, 69383, 69389, 69401, 69403, 69427, 69431, 69439, 69457, 69463, 69467, 69473, 69481, 69491, 69493, 69497, 69499, 69539, 69557, 69593, 69623, 69653, 69661, 69677, 69691, 69697, 69709, 69737, 69739, 69761, 69763, 69767, 69779, 69809, 69821, 69827, 69829, 69833, 69847, 69857, 69859, 69877, 69899, 69911, 69929, 69931, 69941, 69959, 69991, 69997, 70001, 70003, 70009, 70019, 70039, 70051, 70061, 70067, 70079, 70099, 70111, 70117, 70121, 70123, 70139, 70141, 70157, 70163, 70177, 70181, 70183, 70199, 70201, 70207, 70223, 70229, 70237, 70241, 70249, 70271, 70289, 70297, 70309, 70313, 70321, 70327, 70351, 70373, 70379, 70381, 70393, 70423, 70429, 70439, 70451, 70457, 70459, 70481, 70487, 70489, 70501, 70507, 70529, 70537, 70549, 70571, 70573, 70583, 70589, 70607, 70619, 70621, 70627, 70639, 70657, 70663, 70667, 70687, 70709, 70717, 70729, 70753, 70769, 70783, 70793, 70823, 70841, 70843, 70849, 70853, 70867, 70877, 70879, 70891, 70901, 70913, 70919, 70921, 70937, 70949, 70951, 70957, 70969, 70979, 70981, 70991, 70997, 70999, 71011, 71023, 71039, 71059, 71069, 71081, 71089, 71119, 71129, 71143, 71147, 71153, 71161, 71167, 71171, 71191, 71209, 71233, 71237, 71249, 71257, 71261, 71263, 71287, 71293, 71317, 71327, 71329, 71333, 71339, 71341, 71347, 71353, 71359, 71363, 71387, 71389, 71399, 71411, 71413, 71419, 71429, 71437, 71443, 71453, 71471, 71473, 71479, 71483, 71503, 71527, 71537, 71549, 71551, 71563, 71569, 71593, 71597, 71633, 71647, 71663, 71671, 71693, 71699, 71707, 71711, 71713, 71719, 71741, 71761, 71777, 71789, 71807, 71809, 71821, 71837, 71843, 71849, 71861, 71867, 71879, 71881, 71887, 71899, 71909, 71917, 71933, 71941, 71947, 71963, 71971, 71983, 71987, 71993, 71999, 72019, 72031, 72043, 72047, 72053, 72073, 72077, 72089, 72091, 72101, 72103, 72109, 72139, 72161, 72167, 72169, 72173, 72211, 72221, 72223, 72227, 72229, 72251, 72253, 72269, 72271, 72277, 72287, 72307, 72313, 72337, 72341, 72353, 72367, 72379, 72383, 72421, 72431, 72461, 72467, 72469, 72481, 72493, 72497, 72503, 72533, 72547, 72551, 72559, 72577, 72613, 72617, 72623, 72643, 72647, 72649, 72661, 72671, 72673, 72679, 72689, 72701, 72707, 72719, 72727, 72733, 72739, 72763, 72767, 72797, 72817, 72823, 72859, 72869, 72871, 72883, 72889, 72893, 72901, 72907, 72911, 72923, 72931, 72937, 72949, 72953, 72959, 72973, 72977, 72997, 73009, 73013, 73019, 73037, 73039, 73043, 73061, 73063, 73079, 73091, 73121, 73127, 73133, 73141, 73181, 73189, 73237, 73243, 73259, 73277, 73291, 73303, 73309, 73327, 73331, 73351, 73361, 73363, 73369, 73379, 73387, 73417, 73421, 73433, 73453, 73459, 73471, 73477, 73483, 73517, 73523, 73529, 73547, 73553, 73561, 73571, 73583, 73589, 73597, 73607, 73609, 73613, 73637, 73643, 73651, 73673, 73679, 73681, 73693, 73699, 73709, 73721, 73727, 73751, 73757, 73771, 73783, 73819, 73823, 73847, 73849, 73859, 73867, 73877, 73883, 73897, 73907, 73939, 73943, 73951, 73961, 73973, 73999, 74017, 74021, 74027, 74047, 74051, 74071, 74077, 74093, 74099, 74101, 74131, 74143, 74149, 74159, 74161, 74167, 74177, 74189, 74197, 74201, 74203, 74209, 74219, 74231, 74257, 74279, 74287, 74293, 74297, 74311, 74317, 74323, 74353, 74357, 74363, 74377, 74381, 74383, 74411, 74413, 74419, 74441, 74449, 74453, 74471, 74489, 74507, 74509, 74521, 74527, 74531, 74551, 74561, 74567, 74573, 74587, 74597, 74609, 74611, 74623, 74653, 74687, 74699, 74707, 74713, 74717, 74719, 74729, 74731, 74747, 74759, 74761, 74771, 74779, 74797, 74821, 74827, 74831, 74843, 74857, 74861, 74869, 74873, 74887, 74891, 74897, 74903, 74923, 74929, 74933, 74941, 74959, 75011, 75013, 75017, 75029, 75037, 75041, 75079, 75083, 75109, 75133, 75149, 75161, 75167, 75169, 75181, 75193, 75209, 75211, 75217, 75223, 75227, 75239, 75253, 75269, 75277, 75289, 75307, 75323, 75329, 75337, 75347, 75353, 75367, 75377, 75389, 75391, 75401, 75403, 75407, 75431, 75437, 75479, 75503, 75511, 75521, 75527, 75533, 75539, 75541, 75553, 75557, 75571, 75577, 75583, 75611, 75617, 75619, 75629, 75641, 75653, 75659, 75679, 75683, 75689, 75703, 75707, 75709, 75721, 75731, 75743, 75767, 75773, 75781, 75787, 75793, 75797, 75821, 75833, 75853, 75869, 75883, 75913, 75931, 75937, 75941, 75967, 75979, 75983, 75989, 75991, 75997, 76001, 76003, 76031, 76039, 76079, 76081, 76091, 76099, 76103, 76123, 76129, 76147, 76157, 76159, 76163, 76207, 76213, 76231, 76243, 76249, 76253, 76259, 76261, 76283, 76289, 76303, 76333, 76343, 76367, 76369, 76379, 76387, 76403, 76421, 76423, 76441, 76463, 76471, 76481, 76487, 76493, 76507, 76511, 76519, 76537, 76541, 76543, 76561, 76579, 76597, 76603, 76607, 76631, 76649, 76651, 76667, 76673, 76679, 76697, 76717, 76733, 76753, 76757, 76771, 76777, 76781, 76801, 76819, 76829, 76831, 76837, 76847, 76871, 76873, 76883, 76907, 76913, 76919, 76943, 76949, 76961, 76963, 76991, 77003, 77017, 77023, 77029, 77041, 77047, 77069, 77081, 77093, 77101, 77137, 77141, 77153, 77167, 77171, 77191, 77201, 77213, 77237, 77239, 77243, 77249, 77261, 77263, 77267, 77269, 77279, 77291, 77317, 77323, 77339, 77347, 77351, 77359, 77369, 77377, 77383, 77417, 77419, 77431, 77447, 77471, 77477, 77479, 77489, 77491, 77509, 77513, 77521, 77527, 77543, 77549, 77551, 77557, 77563, 77569, 77573, 77587, 77591, 77611, 77617, 77621, 77641, 77647, 77659, 77681, 77687, 77689, 77699, 77711, 77713, 77719, 77723, 77731, 77743, 77747, 77761, 77773, 77783, 77797, 77801, 77813, 77839, 77849, 77863, 77867, 77893, 77899, 77929, 77933, 77951, 77969, 77977, 77983, 77999, 78007, 78017, 78031, 78041, 78049, 78059, 78079, 78101, 78121, 78137, 78139, 78157, 78163, 78167, 78173, 78179, 78191, 78193, 78203, 78229, 78233, 78241, 78259, 78277, 78283, 78301, 78307, 78311, 78317, 78341, 78347, 78367, 78401, 78427, 78437, 78439, 78467, 78479, 78487, 78497, 78509, 78511, 78517, 78539, 78541, 78553, 78569, 78571, 78577, 78583, 78593, 78607, 78623, 78643, 78649, 78653, 78691, 78697, 78707, 78713, 78721, 78737, 78779, 78781, 78787, 78791, 78797, 78803, 78809, 78823, 78839, 78853, 78857, 78877, 78887, 78889, 78893, 78901, 78919, 78929, 78941, 78977, 78979, 78989, 79031, 79039, 79043, 79063, 79087, 79103, 79111, 79133, 79139, 79147, 79151, 79153, 79159, 79181, 79187, 79193, 79201, 79229, 79231, 79241, 79259, 79273, 79279, 79283, 79301, 79309, 79319, 79333, 79337, 79349, 79357, 79367, 79379, 79393, 79397, 79399, 79411, 79423, 79427, 79433, 79451, 79481, 79493, 79531, 79537, 79549, 79559, 79561, 79579, 79589, 79601, 79609, 79613, 79621, 79627, 79631, 79633, 79657, 79669, 79687, 79691, 79693, 79697, 79699, 79757, 79769, 79777, 79801, 79811, 79813, 79817, 79823, 79829, 79841, 79843, 79847, 79861, 79867, 79873, 79889, 79901, 79903, 79907, 79939, 79943, 79967, 79973, 79979, 79987, 79997, 79999, 0 }; // PRIMES_SIZE = 7836 unsigned long int primes_m1d2[] = { 1, 2, 3, 5, 6, 8, 9, 11, 14, 15, 18, 20, 21, 23, 26, 29, 30, 33, 35, 36, 39, 41, 44, 48, 50, 51, 53, 54, 56, 63, 65, 68, 69, 74, 75, 78, 81, 83, 86, 89, 90, 95, 96, 98, 99, 105, 111, 113, 114, 116, 119, 120, 125, 128, 131, 134, 135, 138, 140, 141, 146, 153, 155, 156, 158, 165, 168, 173, 174, 176, 179, 183, 186, 189, 191, 194, 198, 200, 204, 209, 210, 215, 216, 219, 221, 224, 228, 230, 231, 233, 239, 243, 245, 249, 251, 254, 260, 261, 270, 273, 278, 281, 284, 285, 288, 293, 296, 299, 300, 303, 306, 308, 309, 315, 320, 321, 323, 326, 329, 330, 336, 338, 341, 345, 350, 354, 359, 363, 366, 369, 371, 375, 378, 380, 384, 386, 393, 398, 404, 405, 410, 411, 413, 414, 419, 426, 428, 429, 431, 438, 440, 441, 443, 453, 455, 459, 464, 468, 470, 473, 476, 483, 485, 488, 491, 495, 498, 504, 506, 509, 510, 515, 516, 519, 524, 525, 530, 531, 534, 543, 545, 546, 548, 551, 554, 558, 561, 564, 575, 576, 581, 585, 590, 593, 596, 600, 606, 608, 611, 614, 615, 618, 624, 629, 638, 639, 641, 644, 645, 648, 650, 651, 653, 659, 660, 663, 680, 683, 686, 690, 699, 704, 711, 713, 714, 716, 719, 723, 725, 726, 729, 735, 740, 741, 743, 744, 746, 749, 755, 761, 765, 771, 774, 776, 779, 783, 785, 789, 791, 798, 800, 803, 804, 806, 809, 810, 813, 818, 828, 831, 833, 834, 846, 848, 849, 854, 860, 861, 866, 870, 873, 876, 879, 888, 891, 893, 894, 900, 905, 911, 915, 923, 930, 933, 935, 936, 938, 939, 944, 950, 953, 956, 965, 966, 974, 975, 986, 989, 993, 996, 998, 999, 1001, 1005, 1008, 1013, 1014, 1019, 1026, 1031, 1034, 1040, 1041, 1043, 1044, 1049, 1055, 1056, 1064, 1065, 1068, 1070, 1071, 1076, 1080, 1089, 1101, 1103, 1106, 1110, 1118, 1119, 1121, 1125, 1133, 1134, 1136, 1140, 1143, 1146, 1148, 1154, 1155, 1166, 1169, 1170, 1173, 1175, 1178, 1185, 1188, 1190, 1191, 1194, 1196, 1199, 1205, 1208, 1211, 1218, 1220, 1223, 1229, 1233, 1236, 1238, 1251, 1260, 1265, 1269, 1271, 1274, 1275, 1278, 1289, 1295, 1296, 1304, 1308, 1310, 1316, 1323, 1328, 1329, 1331, 1335, 1338, 1341, 1343, 1344, 1346, 1349, 1353, 1355, 1356, 1359, 1364, 1365, 1370, 1374, 1376, 1383, 1388, 1394, 1395, 1398, 1400, 1401, 1409, 1416, 1418, 1421, 1425, 1428, 1430, 1439, 1443, 1448, 1451, 1454, 1458, 1463, 1469, 1476, 1478, 1481, 1484, 1485, 1499, 1500, 1505, 1509, 1511, 1518, 1520, 1524, 1530, 1533, 1539, 1541, 1544, 1554, 1559, 1560, 1568, 1581, 1583, 1584, 1590, 1593, 1595, 1601, 1604, 1608, 1610, 1614, 1625, 1626, 1628, 1629, 1635, 1649, 1650, 1653, 1656, 1659, 1661, 1664, 1665, 1671, 1673, 1679, 1680, 1685, 1686, 1694, 1695, 1703, 1706, 1716, 1724, 1728, 1730, 1731, 1733, 1734, 1745, 1749, 1755, 1758, 1763, 1764, 1766, 1769, 1770, 1773, 1778, 1779, 1785, 1790, 1791, 1796, 1803, 1806, 1808, 1811, 1815, 1818, 1821, 1829, 1835, 1836, 1838, 1845, 1848, 1850, 1854, 1859, 1863, 1866, 1869, 1880, 1883, 1884, 1889, 1896, 1898, 1901, 1910, 1911, 1916, 1923, 1925, 1926, 1931, 1938, 1940, 1944, 1953, 1955, 1958, 1959, 1961, 1964, 1965, 1971, 1973, 1983, 1994, 2000, 2001, 2003, 2006, 2009, 2010, 2013, 2024, 2025, 2028, 2036, 2039, 2045, 2046, 2049, 2055, 2063, 2064, 2066, 2069, 2076, 2078, 2079, 2088, 2100, 2105, 2108, 2109, 2114, 2115, 2120, 2121, 2126, 2129, 2130, 2135, 2136, 2141, 2144, 2148, 2163, 2168, 2169, 2174, 2178, 2181, 2186, 2195, 2198, 2204, 2210, 2211, 2220, 2223, 2225, 2228, 2231, 2240, 2241, 2246, 2253, 2256, 2258, 2259, 2261, 2273, 2274, 2280, 2283, 2291, 2295, 2298, 2301, 2310, 2318, 2319, 2321, 2324, 2325, 2328, 2331, 2336, 2339, 2345, 2351, 2360, 2361, 2364, 2366, 2375, 2379, 2391, 2393, 2394, 2396, 2399, 2400, 2406, 2408, 2415, 2430, 2435, 2438, 2444, 2451, 2454, 2459, 2465, 2466, 2468, 2471, 2475, 2478, 2483, 2484, 2486, 2493, 2496, 2499, 2501, 2504, 2505, 2510, 2511, 2519, 2525, 2529, 2538, 2540, 2543, 2549, 2550, 2553, 2556, 2559, 2573, 2576, 2583, 2585, 2589, 2594, 2598, 2604, 2613, 2615, 2616, 2618, 2630, 2636, 2639, 2640, 2648, 2651, 2654, 2661, 2666, 2673, 2675, 2690, 2693, 2696, 2699, 2703, 2706, 2708, 2709, 2715, 2718, 2720, 2721, 2724, 2735, 2738, 2739, 2741, 2750, 2751, 2753, 2759, 2760, 2763, 2765, 2778, 2781, 2784, 2786, 2790, 2795, 2811, 2819, 2820, 2823, 2825, 2826, 2828, 2829, 2834, 2841, 2844, 2846, 2850, 2855, 2858, 2868, 2870, 2871, 2874, 2889, 2891, 2895, 2900, 2903, 2906, 2910, 2913, 2919, 2921, 2924, 2925, 2928, 2930, 2933, 2934, 2939, 2940, 2948, 2951, 2961, 2963, 2969, 2976, 2990, 2993, 3003, 3005, 3014, 3018, 3021, 3023, 3026, 3033, 3036, 3039, 3044, 3045, 3050, 3056, 3060, 3065, 3066, 3071, 3075, 3081, 3086, 3098, 3099, 3101, 3105, 3108, 3110, 3114, 3123, 3128, 3131, 3134, 3135, 3138, 3143, 3149, 3150, 3155, 3158, 3161, 3164, 3168, 3171, 3176, 3179, 3180, 3183, 3186, 3189, 3194, 3198, 3210, 3213, 3224, 3225, 3234, 3236, 3240, 3245, 3260, 3264, 3273, 3275, 3276, 3281, 3284, 3285, 3288, 3290, 3299, 3303, 3309, 3318, 3326, 3329, 3330, 3336, 3339, 3344, 3345, 3350, 3351, 3354, 3359, 3366, 3368, 3380, 3381, 3389, 3390, 3395, 3396, 3401, 3411, 3413, 3414, 3416, 3420, 3428, 3431, 3434, 3435, 3441, 3449, 3453, 3455, 3458, 3473, 3474, 3479, 3480, 3483, 3485, 3488, 3491, 3495, 3498, 3500, 3506, 3509, 3513, 3519, 3521, 3528, 3534, 3539, 3551, 3554, 3560, 3563, 3564, 3575, 3579, 3588, 3593, 3596, 3603, 3605, 3606, 3609, 3614, 3618, 3621, 3623, 3626, 3641, 3648, 3653, 3654, 3660, 3665, 3666, 3674, 3675, 3684, 3696, 3705, 3708, 3716, 3725, 3728, 3729, 3738, 3740, 3743, 3744, 3749, 3753, 3758, 3761, 3764, 3768, 3770, 3773, 3774, 3779, 3780, 3786, 3788, 3791, 3794, 3795, 3801, 3803, 3810, 3819, 3821, 3824, 3834, 3836, 3840, 3843, 3845, 3849, 3851, 3858, 3861, 3863, 3870, 3876, 3878, 3879, 3894, 3896, 3908, 3911, 3914, 3920, 3926, 3933, 3936, 3938, 3939, 3941, 3950, 3953, 3959, 3963, 3966, 3968, 3974, 3975, 3981, 3996, 4004, 4005, 4008, 4019, 4026, 4029, 4034, 4040, 4043, 4044, 4046, 4050, 4055, 4058, 4061, 4073, 4080, 4083, 4085, 4089, 4095, 4104, 4109, 4110, 4115, 4116, 4118, 4121, 4131, 4134, 4136, 4143, 4145, 4146, 4148, 4155, 4158, 4164, 4176, 4181, 4184, 4188, 4193, 4194, 4209, 4211, 4214, 4215, 4221, 4223, 4230, 4233, 4250, 4256, 4260, 4263, 4268, 4269, 4271, 4281, 4286, 4290, 4298, 4299, 4304, 4311, 4313, 4314, 4320, 4323, 4331, 4334, 4338, 4340, 4344, 4346, 4349, 4353, 4356, 4359, 4365, 4368, 4370, 4373, 4376, 4380, 4389, 4391, 4401, 4403, 4409, 4410, 4415, 4418, 4419, 4424, 4430, 4431, 4433, 4443, 4446, 4461, 4464, 4466, 4470, 4475, 4481, 4484, 4485, 4499, 4500, 4503, 4505, 4506, 4514, 4520, 4521, 4524, 4529, 4533, 4545, 4551, 4554, 4563, 4566, 4568, 4575, 4578, 4580, 4586, 4590, 4593, 4599, 4601, 4604, 4610, 4613, 4619, 4620, 4628, 4638, 4640, 4641, 4646, 4655, 4659, 4661, 4668, 4670, 4671, 4674, 4685, 4688, 4695, 4698, 4701, 4706, 4709, 4710, 4715, 4716, 4718, 4719, 4730, 4731, 4733, 4736, 4739, 4745, 4748, 4755, 4760, 4766, 4769, 4773, 4775, 4793, 4800, 4806, 4809, 4811, 4814, 4815, 4821, 4824, 4830, 4838, 4839, 4844, 4848, 4859, 4860, 4866, 4869, 4871, 4874, 4883, 4884, 4890, 4893, 4895, 4901, 4905, 4908, 4914, 4916, 4919, 4925, 4928, 4929, 4935, 4941, 4943, 4950, 4953, 4961, 4964, 4965, 4970, 4974, 4983, 4986, 5003, 5004, 5018, 5019, 5030, 5033, 5034, 5039, 5045, 5046, 5049, 5051, 5055, 5066, 5069, 5070, 5075, 5079, 5081, 5084, 5088, 5090, 5096, 5105, 5111, 5121, 5123, 5126, 5129, 5133, 5135, 5136, 5144, 5150, 5151, 5156, 5160, 5165, 5166, 5168, 5171, 5178, 5184, 5195, 5199, 5213, 5214, 5216, 5226, 5228, 5229, 5231, 5238, 5243, 5249, 5250, 5256, 5264, 5265, 5279, 5283, 5294, 5298, 5300, 5303, 5306, 5313, 5315, 5319, 5325, 5328, 5331, 5333, 5343, 5345, 5354, 5355, 5361, 5364, 5366, 5369, 5376, 5385, 5390, 5394, 5399, 5415, 5418, 5423, 5426, 5429, 5430, 5433, 5441, 5444, 5445, 5451, 5454, 5468, 5469, 5474, 5478, 5486, 5489, 5493, 5496, 5501, 5513, 5523, 5528, 5529, 5534, 5535, 5541, 5543, 5546, 5556, 5558, 5559, 5565, 5574, 5579, 5580, 5585, 5586, 5588, 5598, 5606, 5619, 5621, 5625, 5628, 5630, 5636, 5639, 5643, 5649, 5655, 5658, 5660, 5664, 5675, 5676, 5684, 5691, 5696, 5699, 5705, 5711, 5718, 5721, 5723, 5733, 5735, 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30129, 30135, 30144, 30146, 30158, 30165, 30168, 30171, 30176, 30186, 30191, 30198, 30206, 30213, 30221, 30224, 30228, 30246, 30248, 30254, 30260, 30263, 30269, 30294, 30300, 30303, 30305, 30308, 30311, 30315, 30318, 30323, 30324, 30329, 30330, 30339, 30344, 30351, 30359, 30363, 30366, 30368, 30378, 30380, 30381, 30386, 30389, 30396, 30405, 30410, 30429, 30434, 30443, 30444, 30449, 30450, 30456, 30458, 30459, 30461, 30468, 30471, 30476, 30480, 30500, 30503, 30513, 30515, 30521, 30525, 30528, 30545, 30549, 30560, 30564, 30570, 30575, 30576, 30584, 30605, 30611, 30615, 30626, 30630, 30641, 30645, 30648, 30665, 30666, 30669, 30671, 30678, 30681, 30689, 30690, 30701, 30704, 30708, 30720, 30731, 30734, 30735, 30741, 30743, 30746, 30753, 30755, 30759, 30771, 30773, 30776, 30779, 30780, 30791, 30801, 30804, 30806, 30813, 30815, 30818, 30821, 30825, 30828, 30833, 30836, 30840, 30843, 30851, 30858, 30861, 30864, 30875, 30878, 30890, 30906, 30909, 30918, 30921, 30930, 30935, 30939, 30954, 30963, 30966, 30974, 30980, 30983, 30989, 30990, 30993, 30995, 31001, 31005, 31008, 31019, 31023, 31026, 31028, 31035, 31040, 31049, 31059, 31064, 31065, 31068, 31070, 31071, 31085, 31094, 31095, 31100, 31103, 31106, 31109, 31116, 31136, 31148, 31149, 31151, 31155, 31161, 31163, 31173, 31175, 31191, 31200, 31208, 31211, 31229, 31233, 31236, 31238, 31241, 31248, 31250, 31253, 31266, 31269, 31274, 31281, 31290, 31295, 31298, 31301, 31308, 31313, 31316, 31319, 31326, 31329, 31341, 31343, 31350, 31361, 31365, 31371, 31376, 31380, 31386, 31395, 31400, 31409, 31413, 31425, 31430, 31434, 31436, 31448, 31451, 31460, 31463, 31464, 31469, 31484, 31485, 31490, 31491, 31493, 31494, 31514, 31515, 31529, 31533, 31536, 31539, 31548, 31551, 31556, 31563, 31565, 31574, 31589, 31598, 31599, 31605, 31620, 31623, 31638, 31640, 31649, 31655, 31656, 31658, 31665, 31668, 31673, 31676, 31680, 31683, 31688, 31694, 31695, 31698, 31704, 31709, 31710, 31719, 31721, 31731, 31733, 31736, 31743, 31746, 31749, 31760, 31763, 31766, 31770, 31779, 31788, 31793, 31794, 31799, 31800, 31803, 31805, 31808, 31814, 31823, 31824, 31829, 31833, 31835, 31844, 31845, 31848, 31851, 31854, 31859, 31863, 31868, 31871, 31880, 31886, 31890, 31896, 31899, 31901, 31904, 31911, 31919, 31920, 31926, 31928, 31931, 31950, 31953, 31956, 31964, 31974, 31988, 31998, 32003, 32006, 32009, 32016, 32018, 32031, 32033, 32040, 32045, 32054, 32061, 32075, 32076, 32078, 32085, 32093, 32094, 32108, 32111, 32115, 32118, 32135, 32139, 32141, 32150, 32151, 32159, 32163, 32166, 32186, 32190, 32199, 32201, 32216, 32219, 32225, 32226, 32241, 32244, 32249, 32256, 32276, 32283, 32288, 32289, 32295, 32300, 32304, 32306, 32310, 32313, 32316, 32330, 32331, 32333, 32339, 32346, 32354, 32358, 32373, 32381, 32390, 32391, 32396, 32405, 32408, 32424, 32426, 32435, 32438, 32439, 32445, 32450, 32459, 32460, 32463, 32468, 32475, 32484, 32498, 32501, 32505, 32513, 32514, 32516, 32526, 32531, 32535, 32544, 32549, 32550, 32555, 32559, 32561, 32564, 32570, 32573, 32583, 32585, 32586, 32589, 32591, 32601, 32606, 32619, 32628, 32633, 32634, 32643, 32646, 32654, 32661, 32663, 32676, 32678, 32685, 32690, 32696, 32703, 32706, 32709, 32711, 32718, 32723, 32724, 32739, 32748, 32759, 32760, 32768, 32769, 32771, 32775, 32778, 32781, 32789, 32790, 32793, 32799, 32804, 32808, 32814, 32816, 32823, 32825, 32828, 32838, 32843, 32849, 32850, 32853, 32856, 32858, 32859, 32864, 32865, 32880, 32888, 32894, 32904, 32913, 32915, 32918, 32919, 32921, 32925, 32933, 32940, 32949, 32960, 32963, 32964, 32975, 32978, 32981, 32990, 32991, 32996, 33014, 33018, 33020, 33023, 33033, 33035, 33041, 33044, 33051, 33053, 33054, 33068, 33080, 33084, 33086, 33089, 33095, 33110, 33119, 33135, 33146, 33150, 33168, 33171, 33173, 33179, 33180, 33186, 33188, 33191, 33201, 33206, 33215, 33224, 33228, 33231, 33233, 33245, 33249, 33254, 33261, 33264, 33266, 33270, 33276, 33284, 33285, 33293, 33296, 33300, 33308, 33314, 33321, 33326, 33341, 33348, 33350, 33356, 33360, 33366, 33369, 33374, 33375, 33381, 33395, 33398, 33404, 33410, 33420, 33425, 33426, 33431, 33438, 33441, 33444, 33459, 33461, 33465, 33471, 33473, 33474, 33479, 33486, 33488, 33501, 33510, 33516, 33521, 33524, 33528, 33530, 33536, 33539, 33551, 33560, 33564, 33569, 33570, 33576, 33578, 33584, 33590, 33593, 33594, 33605, 33606, 33608, 33609, 33615, 33623, 33630, 33635, 33636, 33644, 33653, 33669, 33671, 33674, 33684, 33695, 33699, 33704, 33705, 33710, 33713, 33714, 33716, 33723, 33726, 33738, 33740, 33744, 33746, 33749, 33755, 33761, 33765, 33768, 33773, 33779, 33783, 33788, 33789, 33794, 33800, 33803, 33809, 33815, 33825, 33839, 33849, 33854, 33861, 33866, 33870, 33875, 33878, 33879, 33881, 33888, 33891, 33894, 33900, 33903, 33909, 33914, 33921, 33926, 33933, 33941, 33945, 33950, 33963, 33965, 33966, 33969, 33971, 33978, 33980, 33983, 33989, 33993, 33996, 34011, 34020, 34026, 34029, 34035, 34043, 34049, 34055, 34056, 34070, 34073, 34080, 34085, 34103, 34104, 34106, 34109, 34113, 34119, 34130, 34139, 34140, 34155, 34164, 34175, 34185, 34194, 34199, 34218, 34221, 34223, 34224, 34236, 34238, 34241, 34244, 34245, 34250, 34253, 34260, 34265, 34269, 34271, 34283, 34290, 34298, 34305, 34316, 34319, 34329, 34334, 34341, 34343, 34349, 34355, 34356, 34364, 34368, 34371, 34374, 34383, 34385, 34388, 34395, 34406, 34409, 34410, 34431, 34439, 34440, 34445, 34448, 34449, 34451, 34454, 34458, 34463, 34473, 34481, 34496, 34500, 34505, 34509, 34514, 34515, 34530, 34533, 34536, 34554, 34559, 34563, 34571, 34574, 34575, 34581, 34595, 34596, 34598, 34601, 34610, 34616, 34619, 34623, 34628, 34629, 34631, 34656, 34658, 34668, 34670, 34685, 34689, 34691, 34694, 34700, 34701, 34713, 34715, 34719, 34728, 34731, 34733, 34736, 34740, 34745, 34746, 34748, 34749, 34769, 34778, 34796, 34811, 34826, 34830, 34838, 34845, 34848, 34854, 34868, 34869, 34880, 34881, 34883, 34889, 34904, 34910, 34913, 34914, 34916, 34923, 34928, 34929, 34938, 34949, 34955, 34964, 34965, 34970, 34979, 34995, 34998, 35000, 35001, 35004, 35009, 35019, 35025, 35030, 35033, 35039, 35049, 35055, 35058, 35060, 35061, 35069, 35070, 35078, 35081, 35088, 35090, 35091, 35099, 35100, 35103, 35111, 35114, 35118, 35120, 35124, 35135, 35144, 35148, 35154, 35156, 35160, 35163, 35175, 35186, 35189, 35190, 35196, 35211, 35214, 35219, 35225, 35228, 35229, 35240, 35243, 35244, 35250, 35253, 35264, 35268, 35274, 35285, 35286, 35291, 35294, 35303, 35309, 35310, 35313, 35319, 35328, 35331, 35333, 35343, 35354, 35358, 35364, 35376, 35384, 35391, 35396, 35411, 35420, 35421, 35424, 35426, 35433, 35438, 35439, 35445, 35450, 35456, 35459, 35460, 35468, 35474, 35475, 35478, 35484, 35489, 35490, 35495, 35498, 35499, 35505, 35511, 35519, 35529, 35534, 35540, 35544, 35559, 35564, 35571, 35573, 35576, 35580, 35583, 35585, 35595, 35604, 35616, 35618, 35624, 35628, 35630, 35631, 35643, 35646, 35658, 35663, 35664, 35666, 35669, 35670, 35673, 35676, 35679, 35681, 35693, 35694, 35699, 35705, 35706, 35709, 35714, 35718, 35721, 35726, 35735, 35736, 35739, 35741, 35751, 35763, 35768, 35774, 35775, 35781, 35784, 35796, 35798, 35816, 35823, 35831, 35835, 35846, 35849, 35853, 35855, 35856, 35859, 35870, 35880, 35888, 35894, 35903, 35904, 35910, 35918, 35921, 35924, 35930, 35933, 35939, 35940, 35943, 35949, 35954, 35958, 35966, 35970, 35973, 35981, 35985, 35991, 35993, 35996, 35999, 36009, 36015, 36021, 36023, 36026, 36036, 36038, 36044, 36045, 36050, 36051, 36054, 36069, 36080, 36083, 36084, 36086, 36105, 36110, 36111, 36113, 36114, 36125, 36126, 36134, 36135, 36138, 36143, 36153, 36156, 36168, 36170, 36176, 36183, 36189, 36191, 36210, 36215, 36230, 36233, 36234, 36240, 36246, 36248, 36251, 36266, 36273, 36275, 36279, 36288, 36306, 36308, 36311, 36321, 36323, 36324, 36330, 36335, 36336, 36339, 36344, 36350, 36353, 36359, 36363, 36366, 36369, 36381, 36383, 36398, 36408, 36411, 36429, 36434, 36435, 36441, 36444, 36446, 36450, 36453, 36455, 36461, 36465, 36468, 36474, 36476, 36479, 36486, 36488, 36498, 36504, 36506, 36509, 36518, 36519, 36521, 36530, 36531, 36539, 36545, 36560, 36563, 36566, 36570, 36590, 36594, 36618, 36621, 36629, 36638, 36645, 36651, 36654, 36663, 36665, 36675, 36680, 36681, 36684, 36689, 36693, 36708, 36710, 36716, 36726, 36729, 36735, 36738, 36741, 36758, 36761, 36764, 36773, 36776, 36780, 36785, 36791, 36794, 36798, 36803, 36804, 36806, 36818, 36821, 36825, 36836, 36839, 36840, 36846, 36849, 36854, 36860, 36863, 36875, 36878, 36885, 36891, 36909, 36911, 36923, 36924, 36929, 36933, 36938, 36941, 36948, 36953, 36969, 36971, 36975, 36980, 36986, 36999, 37008, 37010, 37013, 37023, 37025, 37035, 37038, 37046, 37049, 37050, 37065, 37071, 37074, 37079, 37080, 37083, 37088, 37094, 37098, 37100, 37101, 37104, 37109, 37115, 37128, 37139, 37143, 37146, 37148, 37155, 37158, 37161, 37176, 37178, 37181, 37188, 37190, 37191, 37205, 37206, 37209, 37220, 37224, 37226, 37235, 37244, 37253, 37254, 37260, 37263, 37265, 37275, 37280, 37283, 37286, 37293, 37298, 37304, 37305, 37311, 37326, 37343, 37349, 37353, 37356, 37358, 37359, 37364, 37365, 37373, 37379, 37380, 37385, 37389, 37398, 37410, 37413, 37415, 37421, 37428, 37430, 37434, 37436, 37443, 37445, 37448, 37451, 37461, 37464, 37466, 37470, 37479, 37505, 37506, 37508, 37514, 37518, 37520, 37539, 37541, 37554, 37566, 37574, 37580, 37583, 37584, 37590, 37596, 37604, 37605, 37608, 37611, 37613, 37619, 37626, 37634, 37638, 37644, 37653, 37661, 37664, 37668, 37673, 37676, 37683, 37688, 37694, 37695, 37700, 37701, 37703, 37715, 37718, 37739, 37751, 37755, 37760, 37763, 37766, 37769, 37770, 37776, 37778, 37785, 37788, 37791, 37805, 37808, 37809, 37814, 37820, 37826, 37829, 37839, 37841, 37844, 37851, 37853, 37854, 37860, 37865, 37871, 37883, 37886, 37890, 37893, 37896, 37898, 37910, 37916, 37926, 37934, 37941, 37956, 37965, 37968, 37970, 37983, 37989, 37991, 37994, 37995, 37998, 38000, 38001, 38015, 38019, 38039, 38040, 38045, 38049, 38051, 38061, 38064, 38073, 38078, 38079, 38081, 38103, 38106, 38115, 38121, 38124, 38126, 38129, 38130, 38141, 38144, 38151, 38166, 38171, 38183, 38184, 38189, 38193, 38201, 38210, 38211, 38220, 38231, 38235, 38240, 38243, 38246, 38253, 38255, 38259, 38268, 38270, 38271, 38280, 38289, 38298, 38301, 38303, 38315, 38324, 38325, 38333, 38336, 38339, 38348, 38358, 38366, 38376, 38378, 38385, 38388, 38390, 38400, 38409, 38414, 38415, 38418, 38423, 38435, 38436, 38441, 38453, 38456, 38459, 38471, 38474, 38480, 38481, 38495, 38501, 38508, 38511, 38514, 38520, 38523, 38534, 38540, 38546, 38550, 38568, 38570, 38576, 38583, 38585, 38595, 38600, 38606, 38618, 38619, 38621, 38624, 38630, 38631, 38633, 38634, 38639, 38645, 38658, 38661, 38669, 38673, 38675, 38679, 38684, 38688, 38691, 38708, 38709, 38715, 38723, 38735, 38738, 38739, 38744, 38745, 38754, 38756, 38760, 38763, 38771, 38774, 38775, 38778, 38781, 38784, 38786, 38793, 38795, 38805, 38808, 38810, 38820, 38823, 38829, 38840, 38843, 38844, 38849, 38855, 38856, 38859, 38861, 38865, 38871, 38873, 38880, 38886, 38891, 38898, 38900, 38906, 38919, 38924, 38931, 38933, 38946, 38949, 38964, 38966, 38975, 38984, 38988, 38991, 38999, 39003, 39008, 39015, 39020, 39024, 39029, 39039, 39050, 39060, 39068, 39069, 39078, 39081, 39083, 39086, 39089, 39095, 39096, 39101, 39114, 39116, 39120, 39129, 39138, 39141, 39150, 39153, 39155, 39158, 39170, 39173, 39183, 39200, 39213, 39218, 39219, 39233, 39239, 39243, 39248, 39254, 39255, 39258, 39269, 39270, 39276, 39284, 39285, 39288, 39291, 39296, 39303, 39311, 39321, 39324, 39326, 39345, 39348, 39353, 39356, 39360, 39368, 39389, 39390, 39393, 39395, 39398, 39401, 39404, 39411, 39419, 39426, 39428, 39438, 39443, 39444, 39446, 39450, 39459, 39464, 39470, 39488, 39489, 39494, 39515, 39519, 39521, 39531, 39543, 39551, 39555, 39566, 39569, 39573, 39575, 39576, 39579, 39590, 39593, 39596, 39600, 39614, 39615, 39620, 39629, 39636, 39639, 39641, 39650, 39654, 39659, 39666, 39668, 39674, 39678, 39683, 39689, 39696, 39698, 39699, 39705, 39711, 39713, 39716, 39725, 39740, 39746, 39765, 39768, 39774, 39779, 39780, 39789, 39794, 39800, 39804, 39806, 39810, 39813, 39815, 39816, 39828, 39834, 39843, 39845, 39846, 39848, 39849, 39878, 39884, 39888, 39900, 39905, 39906, 39908, 39911, 39914, 39920, 39921, 39923, 39930, 39933, 39936, 39944, 39950, 39951, 39953, 39969, 39971, 39983, 39986, 39989, 39993, 39998, 39999, 0 }; int notest (mpz_ptr p, mpz_ptr q) { assert((p == q) || (p != q)); // dummy to supress compiler warning return 1; } int test7mod8 (mpz_ptr p, mpz_ptr q) { assert((p == q) || (p != q)); // dummy to supress compiler warning return mpz_congruent_ui_p(p, 7L, 8L); } int test3mod4 (mpz_ptr p, mpz_ptr q) { assert((p == q) || (p != q)); // dummy to supress compiler warning return mpz_congruent_ui_p(p, 3L, 4L); } /** Miller-Rabin witness test, basically algorithm 4.24 [HAC], for a fixed base. @returns 1, if the number @a base is a Miller-Rabin witness to the compositness of @a n. @returns 0, otherwise. */ int tmcg_mpz_mr_witness (mpz_srcptr n, mpz_srcptr base) { int result = 1; mpz_t y, r, nm1; mpz_init(y), mpz_init(nm1), mpz_init(r); // 1. Write $\mathtt{n} - 1 = 2^s r$ such that $r$ is odd. mpz_sub_ui(nm1, n, 1L); unsigned long int s = mpz_scan1(nm1, 0L); mpz_tdiv_q_2exp(r, nm1, s); if (mpz_odd_p(r)) { // 2.2 Compute $y = \mathtt{base}^r \bmod \mathtt{n}$. mpz_powm(y, base, r, n); result = 0; // 2.3 If $y \neq 1$ and $y \neq \mathtt{n} - 1$ then do the following: if ((mpz_cmp_ui(y, 1L) != 0) && (mpz_cmp(y, nm1) != 0)) { for (unsigned long int j = 1; j < s; j++) { mpz_mul(y, y, y); mpz_mod(y, y, n); if (mpz_cmp_ui(y, 1L) == 0) { result = 1; break; } if (mpz_cmp(y, nm1) == 0) break; } // strong witness? if (mpz_cmp(y, nm1) != 0) result = 1; } } mpz_clear(y), mpz_clear(nm1), mpz_clear(r); return result; } bool tmcg_mpz_mr_witness_fast (mpz_srcptr n, mpz_srcptr base, mpz_ptr y, mpz_srcptr nm1, mpz_ptr r) { // 1. Write $\mathtt{n} - 1 = 2^s r$ such that $r$ is odd. unsigned long int s = mpz_scan1(nm1, 0L); mpz_tdiv_q_2exp(r, nm1, s); if (mpz_even_p(r)) return true; // 2.2 Compute $y = \mathtt{base}^r \bmod \mathtt{n}$. mpz_powm(y, base, r, n); // 2.3 If $y \neq 1$ and $y \neq \mathtt{n} - 1$ then do the following: if ((mpz_cmp_ui(y, 1L) != 0) && (mpz_cmp(y, nm1) != 0)) { for (unsigned long int j = 1; j < s; j++) { mpz_mul(y, y, y); mpz_mod(y, y, n); if (mpz_cmp_ui(y, 1L) == 0) return true; if (mpz_cmp(y, nm1) == 0) break; } // strong witness? if (mpz_cmp(y, nm1) != 0) return true; } return false; } /** The fast generation of safe primes is implemented according to [CS00] and M.J. Wiener's "Safe Prime Generation with a Combined Sieve". */ void tmcg_mpz_sprime_test (mpz_ptr p, mpz_ptr q, const unsigned long int qsize, int (*test)(mpz_ptr, mpz_ptr), const unsigned long int mr_iterations, const size_t primes_size) { unsigned long int R_q[SIEVE_SIZE], R_p[SIEVE_SIZE]; mpz_t tmp, y, pm1, qm1, a; mpz_init(tmp), mpz_init(y), mpz_init(pm1), mpz_init(qm1); mpz_init_set_ui(a, 2L); /* Step 1. [CS00]: choose randomly an odd number $q$ of appropriate size */ do tmcg_mpz_srandomb(q, qsize); while (mpz_sizeinbase(q, 2L) < qsize); if (mpz_even_p(q)) mpz_add_ui(q, q, 1L); /* Compute $p = 2q + 1$. */ mpz_mul_2exp(pm1, q, 1L), mpz_add_ui(p, pm1, 1L); mpz_sub_ui(qm1, q, 1L); /* Initalize the sieves for testing divisability by small primes. */ for (size_t i = 0; i < SIEVE_SIZE; i++) { mpz_set_ui(tmp, primes[i]); /* R_q[i] = q mod primes[i] */ mpz_mod(y, q, tmp); R_q[i] = mpz_get_ui(y); /* R_p[i] = (2q+1) mod primes[i] */ mpz_mod(y, p, tmp); R_p[i] = mpz_get_ui(y); } while (1) { /* Increase $q$ by 2 (incremental prime number generator). */ mpz_add_ui(q, q, 2L), mpz_add_ui(qm1, qm1, 2L); /* Increase $p$ by 4 (actually compute $p = 2q + 1$). */ mpz_add_ui(p, p, 4L), mpz_add_ui(pm1, pm1, 4L); /* Use the sieve optimization procedure of Note 4.51(ii) [HAC]. */ bool fail = false; for (size_t i = 0; i < SIEVE_SIZE; i++) { /* Update the sieves. */ R_q[i] += 2, R_q[i] %= primes[i], R_p[i] += 4, R_p[i] %= primes[i]; /* Check whether R_q[i] or R_p[i] is zero. We cannot break this loop, because we have to update the sieves completely for the next round. */ if ((R_q[i] == 0) || (R_p[i] == 0)) fail = true; } if (fail) continue; /* Additional tests? */ if (!test(p, q)) continue; /* Step 2. [CS00]: M.J. Wiener's "Combined Sieve" Check whether $q$ or $p$ are divisable by any primes up to $B$. */ for (size_t i = 0; i < primes_size; i++) { if (mpz_congruent_ui_p(q, primes_m1d2[i], primes[i]) || mpz_congruent_ui_p(p, primes_m1d2[i], primes[i])) { fail = true; break; } if (i >= SIEVE_SIZE) { if (mpz_congruent_ui_p(q, 0L, primes[i]) || mpz_congruent_ui_p(p, 0L, primes[i])) { fail = true; break; } } } if (fail) continue; /* Step 3. [CS00]: Test whether 2 is not a Miller-Rabin witness to the compositeness of $q$. */ if (tmcg_mpz_mr_witness_fast(q, a, y, qm1, tmp)) continue; /* Step 4. [CS00]: Test whether $2^q \equiv \pm 1 \pmod{p}$. */ mpz_powm(y, a, q, p); if ((mpz_cmp_ui(y, 1L) != 0) && (mpz_cmp(y, pm1) != 0)) continue; /* Step 5. [CS00]: Apply the Miller-Rabin test to $q$ a defined number of times (maximum error probability $4^{-mr_iterations}$) using randomly selected bases. */ if (mpz_probab_prime_p(q, mr_iterations - 1)) break; } mpz_clear(tmp), mpz_clear(y), mpz_clear(pm1), mpz_clear(qm1), mpz_clear(a); } // A naive generator for safe primes void tmcg_mpz_sprime_test_naive (mpz_ptr p, mpz_ptr q, const unsigned long int qsize, int (*test)(mpz_ptr, mpz_ptr), const unsigned long int mr_iterations, const size_t primes_size) { /* Choose randomly an odd number $q$ of appropriate size. */ do tmcg_mpz_srandomb(q, qsize); while (mpz_sizeinbase(q, 2L) < qsize); if (mpz_even_p(q)) mpz_add_ui(q, q, 1L); while (1) { /* Increase $q$ by 2 (incremental prime number generator). */ mpz_add_ui(q, q, 2L); /* Compute $p = 2q + 1$. */ mpz_mul_2exp(p, q, 1L); mpz_add_ui(p, p, 1L); /* Additional tests? */ if (!test(p, q)) continue; /* Check whether $q$ or $p$ are divisable by any primes up to $B$. */ bool fail = false; for (size_t i = 0; i < primes_size; i++) { if (mpz_congruent_ui_p(q, primes_m1d2[i], primes[i]) || mpz_congruent_ui_p(p, primes_m1d2[i], primes[i]) || mpz_congruent_ui_p(q, 0L, primes[i]) || mpz_congruent_ui_p(p, 0L, primes[i])) { fail = true; break; } } if (fail) continue; if (!mpz_probab_prime_p(p, 1)) continue; if (!mpz_probab_prime_p(q, mr_iterations)) continue; if (mpz_probab_prime_p(p, mr_iterations - 1)) break; } } // A non-incremental generator for safe primes (slow for $\log_2 p \ge 1024$) void tmcg_mpz_sprime_test_noninc (mpz_ptr p, mpz_ptr q, const unsigned long int qsize, int (*test)(mpz_ptr, mpz_ptr), const unsigned long int mr_iterations, const size_t primes_size) { while (1) { /* Choose randomly an odd number $q$ of appropriate size. */ do tmcg_mpz_srandomb(q, qsize); while (mpz_sizeinbase(q, 2L) < qsize); if (mpz_even_p(q)) mpz_add_ui(q, q, 1L); /* Compute $p = 2q + 1$. */ mpz_mul_2exp(p, q, 1L); mpz_add_ui(p, p, 1L); /* Additional tests? */ if (!test(p, q)) continue; /* Check whether $q$ or $p$ are divisable by any primes up to $B$. */ bool fail = false; for (size_t i = 0; i < primes_size; i++) { if (mpz_congruent_ui_p(q, primes_m1d2[i], primes[i]) || mpz_congruent_ui_p(p, primes_m1d2[i], primes[i]) || mpz_congruent_ui_p(q, 0L, primes[i]) || mpz_congruent_ui_p(p, 0L, primes[i])) { fail = true; break; } } if (fail) continue; // Check that $p$ and $q$ are probable prime. if (!mpz_probab_prime_p(p, 1)) continue; if (!mpz_probab_prime_p(q, mr_iterations)) continue; if (mpz_probab_prime_p(p, mr_iterations - 1)) break; } } void tmcg_mpz_sprime (mpz_ptr p, mpz_ptr q, const unsigned long int qsize, const unsigned long int mr_iterations) { tmcg_mpz_sprime_test(p, q, qsize, notest, mr_iterations, PRIMES); } void tmcg_mpz_smprime (mpz_ptr p, mpz_ptr q, const unsigned long int qsize, const unsigned long int mr_iterations) { tmcg_mpz_sprime_test(p, q, qsize, notest, mr_iterations, MPRIMES); } void tmcg_mpz_sprime_naive (mpz_ptr p, mpz_ptr q, const unsigned long int qsize, const unsigned long int mr_iterations) { tmcg_mpz_sprime_test_naive(p, q, qsize, notest, mr_iterations, PRIMES); } void tmcg_mpz_sprime_noninc (mpz_ptr p, mpz_ptr q, const unsigned long int qsize, const unsigned long int mr_iterations) { tmcg_mpz_sprime_test_noninc(p, q, qsize, notest, mr_iterations, PRIMES); } void tmcg_mpz_sprime2g (mpz_ptr p, mpz_ptr q, const unsigned long int qsize, const unsigned long int mr_iterations) { /* The additional test is required, if we want 2 as generator of $\mathbb{QR}_p$. If $p$ is congruent 7 modulo 8, then 2 is a quadratic residue and hence it will generate the cyclic subgroup of prime order $q = (p-1)/2$. [RS00] */ tmcg_mpz_sprime_test(p, q, qsize, test7mod8, mr_iterations, PRIMES); } void tmcg_mpz_sprime3mod4 (mpz_ptr p, const unsigned long int psize, const unsigned long int mr_iterations) { mpz_t q; /* This test is required, if we want to construct a Blum integer $n$, i.e. a number where both factors are primes congruent 3 modulo 4. */ mpz_init(q); tmcg_mpz_sprime_test(p, q, psize - 1L, test3mod4, mr_iterations, PRIMES); mpz_clear(q); } void tmcg_mpz_lprime (mpz_ptr p, mpz_ptr q, mpz_ptr k, const unsigned long int psize, const unsigned long int qsize, const unsigned long int mr_iterations) { mpz_t foo; if (qsize >= psize) throw std::invalid_argument("tmcg_mpz_lprime: qsize >= psize"); /* Choose randomly a prime number $q$ of appropriate size. Primes of this type are only for public usage, because we use weak random numbers here! */ do tmcg_mpz_wrandomb(q, qsize); while ((mpz_sizeinbase(q, 2L) < qsize) || !mpz_probab_prime_p(q, mr_iterations)); mpz_init(foo); do { /* Choose randomly an even number $k$ and compute $p:= qk + 1$. */ do tmcg_mpz_wrandomb(k, psize - qsize); while (mpz_sizeinbase(k, 2L) < (psize - qsize)); if (mpz_odd_p(k)) mpz_add_ui(k, k, 1L); mpz_mul(p, q, k); mpz_add_ui(p, p, 1L); /* Check wether $k$ and $q$ are coprime, i.e. $gcd(k, q) = 1$. */ mpz_gcd(foo, k, q); } while (mpz_cmp_ui(foo, 1L) || (mpz_sizeinbase(p, 2L) < psize) || !mpz_probab_prime_p(p, mr_iterations)); mpz_clear(foo); } void tmcg_mpz_lprime_prefix (mpz_ptr p, mpz_ptr q, mpz_ptr k, const unsigned long int psize, const unsigned long int qsize, const unsigned long int mr_iterations) { mpz_t foo; if (qsize >= psize) throw std::invalid_argument("tmcg_mpz_lprime_prefix: qsize >= psize"); mpz_init(foo); do { /* Choose randomly a prime number $q$ of appropriate size. Primes of this type are only for public usage, because we use weak random numbers here! */ do tmcg_mpz_wrandomb(q, qsize); while ((mpz_sizeinbase(q, 2L) < qsize) || !mpz_probab_prime_p(q, mr_iterations)); /* Enhance given $k$ by multiples of TMCG_MPZ_IO_BASE. */ while (mpz_sizeinbase(k, 2L) < (psize - qsize)) mpz_mul_ui(k, k, TMCG_MPZ_IO_BASE); if (mpz_odd_p(k)) mpz_add_ui(k, k, 1L); mpz_mul(p, q, k); mpz_add_ui(p, p, 1L); /* Check wether $k$ and $q$ are coprime, i.e. $gcd(k, q) = 1$. */ mpz_gcd(foo, k, q); } while (mpz_cmp_ui(foo, 1L) || (mpz_sizeinbase(p, 2L) < psize) || !mpz_probab_prime_p(p, mr_iterations)); mpz_clear(foo); } void tmcg_mpz_oprime (mpz_ptr p, const unsigned long int psize, const unsigned long int mr_iterations) { /* Choose randomly an odd number $p$ of appropriate size. */ do tmcg_mpz_srandomb(p, psize); while (mpz_sizeinbase(p, 2L) < psize); if (mpz_even_p(p)) mpz_add_ui(p, p, 1L); /* Add two as long as $p$ is not probable prime. */ while (!mpz_probab_prime_p(p, mr_iterations)) mpz_add_ui(p, p, 2L); } void tmcg_mpz_oprime_noninc (mpz_ptr p, const unsigned long int psize, const unsigned long int mr_iterations) { do { /* Choose randomly an odd number $p$ of appropriate size. */ do tmcg_mpz_srandomb(p, psize); while (mpz_sizeinbase(p, 2L) < psize); if (mpz_even_p(p)) mpz_add_ui(p, p, 1L); /* Check whether this number is probably prime. */ } while (!mpz_probab_prime_p(p, mr_iterations)); }