diff options
Diffstat (limited to 'sha1/sha256.c')
| -rw-r--r-- | sha1/sha256.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/sha1/sha256.c b/sha1/sha256.c new file mode 100644 index 0000000..15cfae9 --- /dev/null +++ b/sha1/sha256.c @@ -0,0 +1,205 @@ +/* +** Copyright 2005 Double Precision, Inc. +** See COPYING for distribution information. +*/ + +#define SHA1_INTERNAL +#include "sha1.h" + +#include <string.h> +#include <stdlib.h> + + +#define ROTR(x,n) ((SHA256_WORD)(((SHA256_WORD)(x) >> (n))|((x) << (32-(n))))) + +#define ROTL(x,n) ((SHA256_WORD)(((SHA256_WORD)(x) << (n))|((x) >> (32-(n))))) + + +#define CH(x,y,z) ((SHA256_WORD)(((x) & (y)) ^ ((~(x))&(z)))) +#define MAJ(x,y,z) ((SHA256_WORD)(((x)&(y))^((x)&(z))^((y)&(z)))) + +#define SUM0(x) ((SHA256_WORD)(ROTR((x),2)^ROTR((x),13)^ROTR((x),22))) +#define SUM1(x) ((SHA256_WORD)(ROTR((x),6)^ROTR((x),11)^ROTR((x),25))) + +#define TH0(x) ((SHA256_WORD)(ROTR((x),7)^ROTR((x),18)^((SHA256_WORD)(x)>>3))) +#define TH1(x) ((SHA256_WORD)(ROTR((x),17)^ROTR((x),19)^((SHA256_WORD)(x)>>10))) + +static const SHA256_WORD K[64]= + {0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5, + 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174, + 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da, + 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967, + 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85, + 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070, + 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3, + 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2}; + +void sha256_context_init(struct SHA256_CONTEXT *c) +{ + if (sizeof(SHA256_WORD) != 4) + abort(); + + c->H[0] = 0x6A09E667; + c->H[1] = 0xBB67AE85; + c->H[2] = 0x3C6EF372; + c->H[3] = 0xA54FF53A; + c->H[4] = 0x510E527F; + c->H[5] = 0x9B05688C; + c->H[6] = 0x1F83D9AB; + c->H[7] = 0x5BE0CD19; + c->blk_ptr=0; +} + +void sha256_context_hash(struct SHA256_CONTEXT *cc, + const unsigned char blk[SHA256_BLOCK_SIZE]) +{ + SHA256_WORD W[64]; + unsigned i, t; + SHA256_WORD a,b,c,d,e,f,g,h; + + for (i=t=0; t<16; t++) + { + SHA256_WORD x=blk[i]; i++; + + x=(x << 8) | blk[i]; i++; + x=(x << 8) | blk[i]; i++; + W[t]=(x << 8) | blk[i]; i++; + } + + for (t=16; t<64; t++) + W[t]= TH1(W[t-2]) + W[t-7] + TH0(W[t-15]) + W[t-16]; + + a=cc->H[0]; + b=cc->H[1]; + c=cc->H[2]; + d=cc->H[3]; + e=cc->H[4]; + f=cc->H[5]; + g=cc->H[6]; + h=cc->H[7]; + + for (t=0; t<64; t++) + { + SHA256_WORD T1=h + SUM1(e) + CH(e,f,g) + K[t] + W[t]; + SHA256_WORD T2=SUM0(a)+MAJ(a,b,c); + h=g; + g=f; + f=e; + e=d+T1; + d=c; + c=b; + b=a; + a=T1+T2; + } + + cc->H[0] += a; + cc->H[1] += b; + cc->H[2] += c; + cc->H[3] += d; + cc->H[4] += e; + cc->H[5] += f; + cc->H[6] += g; + cc->H[7] += h; +} + +void sha256_context_hashstream(struct SHA256_CONTEXT *c, const void *p, unsigned l) +{ +const unsigned char *cp=(const unsigned char *)p; +unsigned ll; + + while (l) + { + if (c->blk_ptr == 0 && l >= SHA256_BLOCK_SIZE) + { + sha256_context_hash(c, cp); + cp += SHA256_BLOCK_SIZE; + l -= SHA256_BLOCK_SIZE; + continue; + } + + ll=l; + if (ll > SHA256_BLOCK_SIZE - c->blk_ptr) + ll=SHA256_BLOCK_SIZE - c->blk_ptr; + memcpy(c->blk + c->blk_ptr, cp, ll); + c->blk_ptr += ll; + cp += ll; + l -= ll; + if (c->blk_ptr >= SHA256_BLOCK_SIZE) + { + sha256_context_hash(c, c->blk); + c->blk_ptr=0; + } + } +} + +void sha256_context_endstream(struct SHA256_CONTEXT *c, unsigned long l) +{ + unsigned char buf[8]; + static const unsigned char zero[SHA256_BLOCK_SIZE-8]; + + buf[0]=0x80; + sha256_context_hashstream(c, &buf, 1); + while (c->blk_ptr != SHA256_BLOCK_SIZE-8) + { + if (c->blk_ptr > SHA256_BLOCK_SIZE-8) + { + sha256_context_hashstream(c, zero, + SHA256_BLOCK_SIZE - c->blk_ptr); + continue; + } + sha256_context_hashstream(c, zero, + SHA256_BLOCK_SIZE-8-c->blk_ptr); + } + + l *= 8; + buf[7] = l; + buf[6] = (l >>= 8); + buf[5] = (l >>= 8); + buf[4] = (l >> 8); + buf[3]=buf[2]=buf[1]=buf[0]=0; + + sha256_context_hashstream(c, buf, 8); +} + +void sha256_context_digest(struct SHA256_CONTEXT *c, SHA256_DIGEST d) +{ + unsigned char *dp=d + SHA256_DIGEST_SIZE; + unsigned i; + + for ( i=8; i; ) + { + SHA256_WORD w=c->H[--i]; + + *--dp=w; w >>= 8; + *--dp=w; w >>= 8; + *--dp=w; w >>= 8; + *--dp=w; + } +} + +void sha256_context_restore(struct SHA256_CONTEXT *c, const SHA256_DIGEST d) +{ + const unsigned char *dp=d; + unsigned i; + + for (i=0; i<8; i++) + { + SHA256_WORD w= *dp++; + + w=(w << 8) | *dp++; + w=(w << 8) | *dp++; + w=(w << 8) | *dp++; + c->H[i]=w; + } + c->blk_ptr=0; +} + +void sha256_digest(const void *msg, unsigned len, SHA256_DIGEST d) +{ + struct SHA256_CONTEXT c; + + sha256_context_init( &c ); + sha256_context_hashstream(&c, msg, len); + sha256_context_endstream(&c, len); + sha256_context_digest( &c, d ); +} |