1 /*
2 SipHash reference C implementation
3
4 Written in 2012 by
5 Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
6 Daniel J. Bernstein <djb@cr.yp.to>
7
8 To the extent possible under law, the author(s) have dedicated all copyright
9 and related and neighboring rights to this software to the public domain
10 worldwide. This software is distributed without any warranty.
11
12 You should have received a copy of the CC0 Public Domain Dedication along with
13 this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
14 */
15 #include <stdint.h>
16 #include <stdio.h>
17 #include <string.h>
18 #include "siphash24.h"
19
20 typedef uint64_t u64;
21 typedef uint32_t u32;
22 typedef uint8_t u8;
23
24 #define ROTL(x,b) (u64)( ((x) << (b)) | ( (x) >> (64 - (b))) )
25
26 #define U32TO8_LE(p, v) \
27 (p)[0] = (u8)((v) ); (p)[1] = (u8)((v) >> 8); \
28 (p)[2] = (u8)((v) >> 16); (p)[3] = (u8)((v) >> 24);
29
30 #define U64TO8_LE(p, v) \
31 U32TO8_LE((p), (u32)((v) )); \
32 U32TO8_LE((p) + 4, (u32)((v) >> 32));
33
34 #define U8TO64_LE(p) \
35 (((u64)((p)[0]) ) | \
36 ((u64)((p)[1]) << 8) | \
37 ((u64)((p)[2]) << 16) | \
38 ((u64)((p)[3]) << 24) | \
39 ((u64)((p)[4]) << 32) | \
40 ((u64)((p)[5]) << 40) | \
41 ((u64)((p)[6]) << 48) | \
42 ((u64)((p)[7]) << 56))
43
44 #define SIPROUND \
45 { \
46 v0 += v1; v1=ROTL(v1,13); v1 ^= v0; v0=ROTL(v0,32); \
47 v2 += v3; v3=ROTL(v3,16); v3 ^= v2; \
48 v0 += v3; v3=ROTL(v3,21); v3 ^= v0; \
49 v2 += v1; v1=ROTL(v1,17); v1 ^= v2; v2=ROTL(v2,32); \
50 }
51
52 /* SipHash-2-4 */
crypto_auth(unsigned char * out,const unsigned char * in,unsigned long long inlen,const unsigned char * k)53 static int crypto_auth( unsigned char *out, const unsigned char *in, unsigned long long inlen, const unsigned char *k )
54 {
55 /* "somepseudorandomlygeneratedbytes" */
56 u64 v0 = 0x736f6d6570736575ULL;
57 u64 v1 = 0x646f72616e646f6dULL;
58 u64 v2 = 0x6c7967656e657261ULL;
59 u64 v3 = 0x7465646279746573ULL;
60 u64 b;
61 u64 k0 = U8TO64_LE( k );
62 u64 k1 = U8TO64_LE( k + 8 );
63 const u8 *end = in + inlen - ( inlen % sizeof( u64 ) );
64 const int left = inlen & 7;
65 b = ( ( u64 )inlen ) << 56;
66 v3 ^= k1;
67 v2 ^= k0;
68 v1 ^= k1;
69 v0 ^= k0;
70
71 for ( ; in != end; in += 8 )
72 {
73 u64 m;
74 m = U8TO64_LE( in );
75 #ifdef xxxDEBUG
76 printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( v0 >> 32 ), ( u32 )v0 );
77 printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( v1 >> 32 ), ( u32 )v1 );
78 printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( v2 >> 32 ), ( u32 )v2 );
79 printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( v3 >> 32 ), ( u32 )v3 );
80 printf( "(%3d) compress %08x %08x\n", ( int )inlen, ( u32 )( m >> 32 ), ( u32 )m );
81 #endif
82 v3 ^= m;
83 SIPROUND;
84 SIPROUND;
85 v0 ^= m;
86 }
87
88 switch( left )
89 {
90 case 7: b |= ( ( u64 )in[ 6] ) << 48;
91 case 6: b |= ( ( u64 )in[ 5] ) << 40;
92 case 5: b |= ( ( u64 )in[ 4] ) << 32;
93 case 4: b |= ( ( u64 )in[ 3] ) << 24;
94 case 3: b |= ( ( u64 )in[ 2] ) << 16;
95 case 2: b |= ( ( u64 )in[ 1] ) << 8;
96 case 1: b |= ( ( u64 )in[ 0] ); break;
97 case 0: break;
98 }
99
100 #ifdef xxxDEBUG
101 printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( v0 >> 32 ), ( u32 )v0 );
102 printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( v1 >> 32 ), ( u32 )v1 );
103 printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( v2 >> 32 ), ( u32 )v2 );
104 printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( v3 >> 32 ), ( u32 )v3 );
105 printf( "(%3d) padding %08x %08x\n", ( int )inlen, ( u32 )( b >> 32 ), ( u32 )b );
106 #endif
107 v3 ^= b;
108 SIPROUND;
109 SIPROUND;
110 v0 ^= b;
111 #ifdef xxxDEBUG
112 printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( v0 >> 32 ), ( u32 )v0 );
113 printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( v1 >> 32 ), ( u32 )v1 );
114 printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( v2 >> 32 ), ( u32 )v2 );
115 printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( v3 >> 32 ), ( u32 )v3 );
116 #endif
117 v2 ^= 0xff;
118 SIPROUND;
119 SIPROUND;
120 SIPROUND;
121 SIPROUND;
122 b = v0 ^ v1 ^ v2 ^ v3;
123 U64TO8_LE( out, b );
124 return 0;
125 }
126
127 uint64_t
siphash24(const void * in,size_t inlen,const uint64_t key[2])128 siphash24(const void *in, size_t inlen, const uint64_t key[2])
129 {
130 uint64_t result;
131
132 crypto_auth((unsigned char*)&result,
133 (const unsigned char *)in,
134 inlen,
135 (const unsigned char *)&key[0]);
136
137 return result;
138 }
139
140 /*
141 SipHash-2-4 output with
142 k = 00 01 02 ...
143 and
144 in = (empty string)
145 in = 00 (1 byte)
146 in = 00 01 (2 bytes)
147 in = 00 01 02 (3 bytes)
148 ...
149 in = 00 01 02 ... 3e (63 bytes)
150 */
151 static u8 vectors[64][8] =
152 {
153 { 0x31, 0x0e, 0x0e, 0xdd, 0x47, 0xdb, 0x6f, 0x72, },
154 { 0xfd, 0x67, 0xdc, 0x93, 0xc5, 0x39, 0xf8, 0x74, },
155 { 0x5a, 0x4f, 0xa9, 0xd9, 0x09, 0x80, 0x6c, 0x0d, },
156 { 0x2d, 0x7e, 0xfb, 0xd7, 0x96, 0x66, 0x67, 0x85, },
157 { 0xb7, 0x87, 0x71, 0x27, 0xe0, 0x94, 0x27, 0xcf, },
158 { 0x8d, 0xa6, 0x99, 0xcd, 0x64, 0x55, 0x76, 0x18, },
159 { 0xce, 0xe3, 0xfe, 0x58, 0x6e, 0x46, 0xc9, 0xcb, },
160 { 0x37, 0xd1, 0x01, 0x8b, 0xf5, 0x00, 0x02, 0xab, },
161 { 0x62, 0x24, 0x93, 0x9a, 0x79, 0xf5, 0xf5, 0x93, },
162 { 0xb0, 0xe4, 0xa9, 0x0b, 0xdf, 0x82, 0x00, 0x9e, },
163 { 0xf3, 0xb9, 0xdd, 0x94, 0xc5, 0xbb, 0x5d, 0x7a, },
164 { 0xa7, 0xad, 0x6b, 0x22, 0x46, 0x2f, 0xb3, 0xf4, },
165 { 0xfb, 0xe5, 0x0e, 0x86, 0xbc, 0x8f, 0x1e, 0x75, },
166 { 0x90, 0x3d, 0x84, 0xc0, 0x27, 0x56, 0xea, 0x14, },
167 { 0xee, 0xf2, 0x7a, 0x8e, 0x90, 0xca, 0x23, 0xf7, },
168 { 0xe5, 0x45, 0xbe, 0x49, 0x61, 0xca, 0x29, 0xa1, },
169 { 0xdb, 0x9b, 0xc2, 0x57, 0x7f, 0xcc, 0x2a, 0x3f, },
170 { 0x94, 0x47, 0xbe, 0x2c, 0xf5, 0xe9, 0x9a, 0x69, },
171 { 0x9c, 0xd3, 0x8d, 0x96, 0xf0, 0xb3, 0xc1, 0x4b, },
172 { 0xbd, 0x61, 0x79, 0xa7, 0x1d, 0xc9, 0x6d, 0xbb, },
173 { 0x98, 0xee, 0xa2, 0x1a, 0xf2, 0x5c, 0xd6, 0xbe, },
174 { 0xc7, 0x67, 0x3b, 0x2e, 0xb0, 0xcb, 0xf2, 0xd0, },
175 { 0x88, 0x3e, 0xa3, 0xe3, 0x95, 0x67, 0x53, 0x93, },
176 { 0xc8, 0xce, 0x5c, 0xcd, 0x8c, 0x03, 0x0c, 0xa8, },
177 { 0x94, 0xaf, 0x49, 0xf6, 0xc6, 0x50, 0xad, 0xb8, },
178 { 0xea, 0xb8, 0x85, 0x8a, 0xde, 0x92, 0xe1, 0xbc, },
179 { 0xf3, 0x15, 0xbb, 0x5b, 0xb8, 0x35, 0xd8, 0x17, },
180 { 0xad, 0xcf, 0x6b, 0x07, 0x63, 0x61, 0x2e, 0x2f, },
181 { 0xa5, 0xc9, 0x1d, 0xa7, 0xac, 0xaa, 0x4d, 0xde, },
182 { 0x71, 0x65, 0x95, 0x87, 0x66, 0x50, 0xa2, 0xa6, },
183 { 0x28, 0xef, 0x49, 0x5c, 0x53, 0xa3, 0x87, 0xad, },
184 { 0x42, 0xc3, 0x41, 0xd8, 0xfa, 0x92, 0xd8, 0x32, },
185 { 0xce, 0x7c, 0xf2, 0x72, 0x2f, 0x51, 0x27, 0x71, },
186 { 0xe3, 0x78, 0x59, 0xf9, 0x46, 0x23, 0xf3, 0xa7, },
187 { 0x38, 0x12, 0x05, 0xbb, 0x1a, 0xb0, 0xe0, 0x12, },
188 { 0xae, 0x97, 0xa1, 0x0f, 0xd4, 0x34, 0xe0, 0x15, },
189 { 0xb4, 0xa3, 0x15, 0x08, 0xbe, 0xff, 0x4d, 0x31, },
190 { 0x81, 0x39, 0x62, 0x29, 0xf0, 0x90, 0x79, 0x02, },
191 { 0x4d, 0x0c, 0xf4, 0x9e, 0xe5, 0xd4, 0xdc, 0xca, },
192 { 0x5c, 0x73, 0x33, 0x6a, 0x76, 0xd8, 0xbf, 0x9a, },
193 { 0xd0, 0xa7, 0x04, 0x53, 0x6b, 0xa9, 0x3e, 0x0e, },
194 { 0x92, 0x59, 0x58, 0xfc, 0xd6, 0x42, 0x0c, 0xad, },
195 { 0xa9, 0x15, 0xc2, 0x9b, 0xc8, 0x06, 0x73, 0x18, },
196 { 0x95, 0x2b, 0x79, 0xf3, 0xbc, 0x0a, 0xa6, 0xd4, },
197 { 0xf2, 0x1d, 0xf2, 0xe4, 0x1d, 0x45, 0x35, 0xf9, },
198 { 0x87, 0x57, 0x75, 0x19, 0x04, 0x8f, 0x53, 0xa9, },
199 { 0x10, 0xa5, 0x6c, 0xf5, 0xdf, 0xcd, 0x9a, 0xdb, },
200 { 0xeb, 0x75, 0x09, 0x5c, 0xcd, 0x98, 0x6c, 0xd0, },
201 { 0x51, 0xa9, 0xcb, 0x9e, 0xcb, 0xa3, 0x12, 0xe6, },
202 { 0x96, 0xaf, 0xad, 0xfc, 0x2c, 0xe6, 0x66, 0xc7, },
203 { 0x72, 0xfe, 0x52, 0x97, 0x5a, 0x43, 0x64, 0xee, },
204 { 0x5a, 0x16, 0x45, 0xb2, 0x76, 0xd5, 0x92, 0xa1, },
205 { 0xb2, 0x74, 0xcb, 0x8e, 0xbf, 0x87, 0x87, 0x0a, },
206 { 0x6f, 0x9b, 0xb4, 0x20, 0x3d, 0xe7, 0xb3, 0x81, },
207 { 0xea, 0xec, 0xb2, 0xa3, 0x0b, 0x22, 0xa8, 0x7f, },
208 { 0x99, 0x24, 0xa4, 0x3c, 0xc1, 0x31, 0x57, 0x24, },
209 { 0xbd, 0x83, 0x8d, 0x3a, 0xaf, 0xbf, 0x8d, 0xb7, },
210 { 0x0b, 0x1a, 0x2a, 0x32, 0x65, 0xd5, 0x1a, 0xea, },
211 { 0x13, 0x50, 0x79, 0xa3, 0x23, 0x1c, 0xe6, 0x60, },
212 { 0x93, 0x2b, 0x28, 0x46, 0xe4, 0xd7, 0x06, 0x66, },
213 { 0xe1, 0x91, 0x5f, 0x5c, 0xb1, 0xec, 0xa4, 0x6c, },
214 { 0xf3, 0x25, 0x96, 0x5c, 0xa1, 0x6d, 0x62, 0x9f, },
215 { 0x57, 0x5f, 0xf2, 0x8e, 0x60, 0x38, 0x1b, 0xe5, },
216 { 0x72, 0x45, 0x06, 0xeb, 0x4c, 0x32, 0x8a, 0x95, }
217 };
218
219
220 static int
test_vectors()221 test_vectors()
222 {
223 #define MAXLEN 64
224 u8 in[MAXLEN], out[8], k[16];
225 int i;
226 int ok = 1;
227
228 for( i = 0; i < 16; ++i ) k[i] = (u8)i;
229
230 for( i = 0; i < MAXLEN; ++i )
231 {
232 in[i] = (u8)i;
233 crypto_auth( out, in, i, k );
234
235 if ( memcmp( out, vectors[i], 8 ) )
236 {
237 printf( "test vector failed for %d bytes\n", i );
238 ok = 0;
239 }
240 }
241
242 return ok;
243 }
244
245 int
siphash24_selftest(void)246 siphash24_selftest(void)
247 {
248 if (test_vectors())
249 return 0;
250 else
251 return 1;
252 }
253