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Diffstat (limited to 'src/sha256.c')
| -rw-r--r-- | src/sha256.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/src/sha256.c b/src/sha256.c new file mode 100644 index 0000000..71be516 --- /dev/null +++ b/src/sha256.c @@ -0,0 +1,265 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com + */ + +#include "common.h" +#include "libimobiledevice-glue/sha.h" + +#include "fixedint.h" + +/* the K array */ +static const uint32_t K[64] = { + 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL, + 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL, + 0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, + 0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL, + 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL, + 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL, + 0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, + 0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL, + 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL, + 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL, + 0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, + 0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL, + 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL +}; + +/* Various logical functions */ + +#define RORc(x, y) \ + ( ((((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)((y)&31)) | \ + ((unsigned long)(x)<<(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL) + +#define STORE32H(x, y) \ + { (y)[0] = (unsigned char)(((x)>>24)&255); (y)[1] = (unsigned char)(((x)>>16)&255); \ + (y)[2] = (unsigned char)(((x)>>8)&255); (y)[3] = (unsigned char)((x)&255); } + +#define LOAD32H(x, y) \ + { x = ((unsigned long)((y)[0] & 255)<<24) | \ + ((unsigned long)((y)[1] & 255)<<16) | \ + ((unsigned long)((y)[2] & 255)<<8) | \ + ((unsigned long)((y)[3] & 255)); } + +#define STORE64H(x, y) \ + { (y)[0] = (unsigned char)(((x)>>56)&255); (y)[1] = (unsigned char)(((x)>>48)&255); \ + (y)[2] = (unsigned char)(((x)>>40)&255); (y)[3] = (unsigned char)(((x)>>32)&255); \ + (y)[4] = (unsigned char)(((x)>>24)&255); (y)[5] = (unsigned char)(((x)>>16)&255); \ + (y)[6] = (unsigned char)(((x)>>8)&255); (y)[7] = (unsigned char)((x)&255); } + +#define Ch(x,y,z) (z ^ (x & (y ^ z))) +#define Maj(x,y,z) (((x | y) & z) | (x & y)) +#define S(x, n) RORc((x),(n)) +#define R(x, n) (((x)&0xFFFFFFFFUL)>>(n)) +#define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22)) +#define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25)) +#define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3)) +#define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10)) +#ifndef MIN + #define MIN(x, y) ( ((x)<(y))?(x):(y) ) +#endif + +/* compress 256-bits */ +static int sha256_compress(sha256_context * md, unsigned char *buf) +{ + uint32_t S[8], W[64], t0, t1; + uint32_t t; + int i; + /* copy state into S */ + for (i = 0; i < 8; i++) { + S[i] = md->state[i]; + } + /* copy the state into 512-bits into W[0..15] */ + for (i = 0; i < 16; i++) { + LOAD32H(W[i], buf + (4*i)); + } + /* fill W[16..63] */ + for (i = 16; i < 64; i++) { + W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16]; + } + /* Compress */ + #define RND(a,b,c,d,e,f,g,h,i) \ + t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \ + t1 = Sigma0(a) + Maj(a, b, c); \ + d += t0; \ + h = t0 + t1; + for (i = 0; i < 64; ++i) { + RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i); + t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4]; + S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t; + } + #undef RND + /* feedback */ + for (i = 0; i < 8; i++) { + md->state[i] = md->state[i] + S[i]; + } + return 0; +} + +/** + Initialize the hash state + @param md The hash state you wish to initialize + @return CRYPT_OK if successful +*/ +int sha256_init(sha256_context * md) +{ + if (md == NULL) return 1; + md->curlen = 0; + md->length = 0; + md->state[0] = 0x6A09E667UL; + md->state[1] = 0xBB67AE85UL; + md->state[2] = 0x3C6EF372UL; + md->state[3] = 0xA54FF53AUL; + md->state[4] = 0x510E527FUL; + md->state[5] = 0x9B05688CUL; + md->state[6] = 0x1F83D9ABUL; + md->state[7] = 0x5BE0CD19UL; + md->num_dwords = 8; + return 0; +} + +/** + Process a block of memory though the hash + @param md The hash state + @param data The data to hash + @param inlen The length of the data (octets) + @return 0 if successful +*/ +int sha256_update (sha256_context * md, const void *data, size_t inlen) +{ + const unsigned char* in = (const unsigned char*)data; + size_t n; + size_t i; + int err; + if (md == NULL) return 1; + if (in == NULL) return 1; + if (md->curlen > sizeof(md->buf)) { + return 1; + } + while (inlen > 0) { + if (md->curlen == 0 && inlen >= 64) { + if ((err = sha256_compress (md, (unsigned char *)in)) != 0) { + return err; + } + md->length += 64 * 8; + in += 64; + inlen -= 64; + } else { + n = MIN(inlen, (64 - md->curlen)); + + for (i = 0; i < n; i++) { + md->buf[i + md->curlen] = in[i]; + } + + + md->curlen += n; + in += n; + inlen -= n; + if (md->curlen == 64) { + if ((err = sha256_compress (md, md->buf)) != 0) { + return err; + } + md->length += 8*64; + md->curlen = 0; + } + } + } + return 0; +} + +/** + Terminate the hash to get the digest + @param md The hash state + @param out [out] The destination of the hash (32 bytes) + @return 0 if successful +*/ +int sha256_final(sha256_context * md, unsigned char *out) +{ + int i; + if (md == NULL) return 1; + if (out == NULL) return 1; + if (md->curlen >= sizeof(md->buf)) { + return 1; + } + /* increase the length of the message */ + md->length += md->curlen * 8; + /* append the '1' bit */ + md->buf[md->curlen++] = (unsigned char)0x80; + /* if the length is currently above 56 bytes we append zeros + * then compress. Then we can fall back to padding zeros and length + * encoding like normal. + */ + if (md->curlen > 56) { + while (md->curlen < 64) { + md->buf[md->curlen++] = (unsigned char)0; + } + sha256_compress(md, md->buf); + md->curlen = 0; + } + /* pad upto 56 bytes of zeroes */ + while (md->curlen < 56) { + md->buf[md->curlen++] = (unsigned char)0; + } + /* store length */ + STORE64H(md->length, md->buf+56); + sha256_compress(md, md->buf); + /* copy output */ + for (i = 0; i < md->num_dwords; i++) { + STORE32H(md->state[i], out+(4*i)); + } + return 0; +} + +int sha256(const unsigned char *message, size_t message_len, unsigned char *out) +{ + sha256_context ctx; + int ret; + if ((ret = sha256_init(&ctx))) return ret; + if ((ret = sha256_update(&ctx, message, message_len))) return ret; + if ((ret = sha256_final(&ctx, out))) return ret; + return 0; +} + +int sha224_init(sha224_context * md) { + if (md == NULL) return 1; + + md->curlen = 0; + md->length = 0; + md->state[0] = 0xc1059ed8UL; + md->state[1] = 0x367cd507UL; + md->state[2] = 0x3070dd17UL; + md->state[3] = 0xf70e5939UL; + md->state[4] = 0xffc00b31UL; + md->state[5] = 0x68581511UL; + md->state[6] = 0x64f98fa7UL; + md->state[7] = 0xbefa4fa4UL; + md->num_dwords = 6; + + return 0; +} + +int sha224_update(sha224_context * md, const void *data, size_t inlen) +{ + return sha256_update(md, data, inlen); +} + +int sha224_final(sha224_context * md, unsigned char* out) +{ + return sha256_final(md, out); +} + +int sha224(const unsigned char *message, size_t message_len, unsigned char *out) +{ + sha224_context ctx; + int ret; + if ((ret = sha224_init(&ctx))) return ret; + if ((ret = sha224_update(&ctx, message, message_len))) return ret; + if ((ret = sha224_final(&ctx, out))) return ret; + return 0; +} |