| 1 | /* |
| 2 | ** Copyright 2005 Double Precision, Inc. |
| 3 | ** See COPYING for distribution information. |
| 4 | */ |
| 5 | |
| 6 | #define SHA1_INTERNAL |
| 7 | #include "sha1.h" |
| 8 | |
| 9 | #include <string.h> |
| 10 | #include <stdlib.h> |
| 11 | |
| 12 | |
| 13 | #define ROTR(x,n) ((SHA256_WORD)(((SHA256_WORD)(x) >> (n))|((x) << (32-(n))))) |
| 14 | |
| 15 | #define ROTL(x,n) ((SHA256_WORD)(((SHA256_WORD)(x) << (n))|((x) >> (32-(n))))) |
| 16 | |
| 17 | |
| 18 | #define CH(x,y,z) ((SHA256_WORD)(((x) & (y)) ^ ((~(x))&(z)))) |
| 19 | #define MAJ(x,y,z) ((SHA256_WORD)(((x)&(y))^((x)&(z))^((y)&(z)))) |
| 20 | |
| 21 | #define SUM0(x) ((SHA256_WORD)(ROTR((x),2)^ROTR((x),13)^ROTR((x),22))) |
| 22 | #define SUM1(x) ((SHA256_WORD)(ROTR((x),6)^ROTR((x),11)^ROTR((x),25))) |
| 23 | |
| 24 | #define TH0(x) ((SHA256_WORD)(ROTR((x),7)^ROTR((x),18)^((SHA256_WORD)(x)>>3))) |
| 25 | #define TH1(x) ((SHA256_WORD)(ROTR((x),17)^ROTR((x),19)^((SHA256_WORD)(x)>>10))) |
| 26 | |
| 27 | static const SHA256_WORD K[64]= |
| 28 | {0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5, |
| 29 | 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174, |
| 30 | 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da, |
| 31 | 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967, |
| 32 | 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85, |
| 33 | 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070, |
| 34 | 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3, |
| 35 | 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2}; |
| 36 | |
| 37 | void sha256_context_init(struct SHA256_CONTEXT *c) |
| 38 | { |
| 39 | if (sizeof(SHA256_WORD) != 4) |
| 40 | abort(); |
| 41 | |
| 42 | c->H[0] = 0x6A09E667; |
| 43 | c->H[1] = 0xBB67AE85; |
| 44 | c->H[2] = 0x3C6EF372; |
| 45 | c->H[3] = 0xA54FF53A; |
| 46 | c->H[4] = 0x510E527F; |
| 47 | c->H[5] = 0x9B05688C; |
| 48 | c->H[6] = 0x1F83D9AB; |
| 49 | c->H[7] = 0x5BE0CD19; |
| 50 | c->blk_ptr=0; |
| 51 | } |
| 52 | |
| 53 | void sha256_context_hash(struct SHA256_CONTEXT *cc, |
| 54 | const unsigned char blk[SHA256_BLOCK_SIZE]) |
| 55 | { |
| 56 | SHA256_WORD W[64]; |
| 57 | unsigned i, t; |
| 58 | SHA256_WORD a,b,c,d,e,f,g,h; |
| 59 | |
| 60 | for (i=t=0; t<16; t++) |
| 61 | { |
| 62 | SHA256_WORD x=blk[i]; i++; |
| 63 | |
| 64 | x=(x << 8) | blk[i]; i++; |
| 65 | x=(x << 8) | blk[i]; i++; |
| 66 | W[t]=(x << 8) | blk[i]; i++; |
| 67 | } |
| 68 | |
| 69 | for (t=16; t<64; t++) |
| 70 | W[t]= TH1(W[t-2]) + W[t-7] + TH0(W[t-15]) + W[t-16]; |
| 71 | |
| 72 | a=cc->H[0]; |
| 73 | b=cc->H[1]; |
| 74 | c=cc->H[2]; |
| 75 | d=cc->H[3]; |
| 76 | e=cc->H[4]; |
| 77 | f=cc->H[5]; |
| 78 | g=cc->H[6]; |
| 79 | h=cc->H[7]; |
| 80 | |
| 81 | for (t=0; t<64; t++) |
| 82 | { |
| 83 | SHA256_WORD T1=h + SUM1(e) + CH(e,f,g) + K[t] + W[t]; |
| 84 | SHA256_WORD T2=SUM0(a)+MAJ(a,b,c); |
| 85 | h=g; |
| 86 | g=f; |
| 87 | f=e; |
| 88 | e=d+T1; |
| 89 | d=c; |
| 90 | c=b; |
| 91 | b=a; |
| 92 | a=T1+T2; |
| 93 | } |
| 94 | |
| 95 | cc->H[0] += a; |
| 96 | cc->H[1] += b; |
| 97 | cc->H[2] += c; |
| 98 | cc->H[3] += d; |
| 99 | cc->H[4] += e; |
| 100 | cc->H[5] += f; |
| 101 | cc->H[6] += g; |
| 102 | cc->H[7] += h; |
| 103 | } |
| 104 | |
| 105 | void sha256_context_hashstream(struct SHA256_CONTEXT *c, const void *p, unsigned l) |
| 106 | { |
| 107 | const unsigned char *cp=(const unsigned char *)p; |
| 108 | unsigned ll; |
| 109 | |
| 110 | while (l) |
| 111 | { |
| 112 | if (c->blk_ptr == 0 && l >= SHA256_BLOCK_SIZE) |
| 113 | { |
| 114 | sha256_context_hash(c, cp); |
| 115 | cp += SHA256_BLOCK_SIZE; |
| 116 | l -= SHA256_BLOCK_SIZE; |
| 117 | continue; |
| 118 | } |
| 119 | |
| 120 | ll=l; |
| 121 | if (ll > SHA256_BLOCK_SIZE - c->blk_ptr) |
| 122 | ll=SHA256_BLOCK_SIZE - c->blk_ptr; |
| 123 | memcpy(c->blk + c->blk_ptr, cp, ll); |
| 124 | c->blk_ptr += ll; |
| 125 | cp += ll; |
| 126 | l -= ll; |
| 127 | if (c->blk_ptr >= SHA256_BLOCK_SIZE) |
| 128 | { |
| 129 | sha256_context_hash(c, c->blk); |
| 130 | c->blk_ptr=0; |
| 131 | } |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | void sha256_context_endstream(struct SHA256_CONTEXT *c, unsigned long l) |
| 136 | { |
| 137 | unsigned char buf[8]; |
| 138 | static const unsigned char zero[SHA256_BLOCK_SIZE-8]; |
| 139 | |
| 140 | buf[0]=0x80; |
| 141 | sha256_context_hashstream(c, &buf, 1); |
| 142 | while (c->blk_ptr != SHA256_BLOCK_SIZE-8) |
| 143 | { |
| 144 | if (c->blk_ptr > SHA256_BLOCK_SIZE-8) |
| 145 | { |
| 146 | sha256_context_hashstream(c, zero, |
| 147 | SHA256_BLOCK_SIZE - c->blk_ptr); |
| 148 | continue; |
| 149 | } |
| 150 | sha256_context_hashstream(c, zero, |
| 151 | SHA256_BLOCK_SIZE-8-c->blk_ptr); |
| 152 | } |
| 153 | |
| 154 | l *= 8; |
| 155 | buf[7] = l; |
| 156 | buf[6] = (l >>= 8); |
| 157 | buf[5] = (l >>= 8); |
| 158 | buf[4] = (l >> 8); |
| 159 | buf[3]=buf[2]=buf[1]=buf[0]=0; |
| 160 | |
| 161 | sha256_context_hashstream(c, buf, 8); |
| 162 | } |
| 163 | |
| 164 | void sha256_context_digest(struct SHA256_CONTEXT *c, SHA256_DIGEST d) |
| 165 | { |
| 166 | unsigned char *dp=d + SHA256_DIGEST_SIZE; |
| 167 | unsigned i; |
| 168 | |
| 169 | for ( i=8; i; ) |
| 170 | { |
| 171 | SHA256_WORD w=c->H[--i]; |
| 172 | |
| 173 | *--dp=w; w >>= 8; |
| 174 | *--dp=w; w >>= 8; |
| 175 | *--dp=w; w >>= 8; |
| 176 | *--dp=w; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | void sha256_context_restore(struct SHA256_CONTEXT *c, const SHA256_DIGEST d) |
| 181 | { |
| 182 | const unsigned char *dp=d; |
| 183 | unsigned i; |
| 184 | |
| 185 | for (i=0; i<8; i++) |
| 186 | { |
| 187 | SHA256_WORD w= *dp++; |
| 188 | |
| 189 | w=(w << 8) | *dp++; |
| 190 | w=(w << 8) | *dp++; |
| 191 | w=(w << 8) | *dp++; |
| 192 | c->H[i]=w; |
| 193 | } |
| 194 | c->blk_ptr=0; |
| 195 | } |
| 196 | |
| 197 | void sha256_digest(const void *msg, unsigned len, SHA256_DIGEST d) |
| 198 | { |
| 199 | struct SHA256_CONTEXT c; |
| 200 | |
| 201 | sha256_context_init( &c ); |
| 202 | sha256_context_hashstream(&c, msg, len); |
| 203 | sha256_context_endstream(&c, len); |
| 204 | sha256_context_digest( &c, d ); |
| 205 | } |