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