diff options
| -rw-r--r-- | libbb/sha1.c | 221 |
1 files changed, 96 insertions, 125 deletions
diff --git a/libbb/sha1.c b/libbb/sha1.c index ccc3176..a074359 100644 --- a/libbb/sha1.c +++ b/libbb/sha1.c @@ -53,24 +53,20 @@ static inline uint64_t hton64(uint64_t v) #endif -#define SHA1_BLOCK_SIZE 64 -#define SHA1_MASK (SHA1_BLOCK_SIZE - 1) - static void FAST_FUNC sha1_process_block64(sha1_ctx_t *ctx) { - unsigned i; - uint32_t w[80], a, b, c, d, e, t; - uint32_t *words; + unsigned t; + uint32_t W[80], a, b, c, d, e; + const uint32_t *words = (uint32_t*) ctx->wbuffer; - words = (uint32_t*) ctx->wbuffer; - for (i = 0; i < SHA1_BLOCK_SIZE / 4; ++i) { - w[i] = ntohl(*words); + for (t = 0; t < 16; ++t) { + W[t] = ntohl(*words); words++; } - for (/*i = SHA1_BLOCK_SIZE / 4*/; i < 80; ++i) { - t = w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16]; - w[i] = rotl32(t, 1); + for (/*t = 16*/; t < 80; ++t) { + uint32_t T = W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16]; + W[t] = rotl32(T, 1); } a = ctx->hash[0]; @@ -87,20 +83,24 @@ static void FAST_FUNC sha1_process_block64(sha1_ctx_t *ctx) /* partial loop unrolling and is optimised for the Pentium 4 */ #define rnd(f,k) \ do { \ - t = a; a = rotl32(a,5) + f(b,c,d) + e + k + w[i]; \ - e = d; d = c; c = rotl32(b, 30); b = t; \ + uint32_t T = a; \ + a = rotl32(a, 5) + f(b, c, d) + e + k + W[t]; \ + e = d; \ + d = c; \ + c = rotl32(b, 30); \ + b = T; \ } while (0) - for (i = 0; i < 20; ++i) + for (t = 0; t < 20; ++t) rnd(ch, 0x5a827999); - for (/*i = 20*/; i < 40; ++i) + for (/*t = 20*/; t < 40; ++t) rnd(parity, 0x6ed9eba1); - for (/*i = 40*/; i < 60; ++i) + for (/*t = 40*/; t < 60; ++t) rnd(maj, 0x8f1bbcdc); - for (/*i = 60*/; i < 80; ++i) + for (/*t = 60*/; t < 80; ++t) rnd(parity, 0xca62c1d6); #undef ch #undef parity @@ -114,107 +114,58 @@ static void FAST_FUNC sha1_process_block64(sha1_ctx_t *ctx) ctx->hash[4] += e; } -/* Constants for SHA256 from FIPS 180-2:4.2.2. */ -static const uint32_t K256[80] = { - 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, - 0xca273ece, 0xd186b8c7, /* [64]+ are used for sha512 only */ - 0xeada7dd6, 0xf57d4f7f, - 0x06f067aa, 0x0a637dc5, - 0x113f9804, 0x1b710b35, - 0x28db77f5, 0x32caab7b, - 0x3c9ebe0a, 0x431d67c4, - 0x4cc5d4be, 0x597f299c, - 0x5fcb6fab, 0x6c44198c -}; -/* Constants for SHA512 from FIPS 180-2:4.2.3. */ -static const uint32_t K512_lo[80] = { - 0xd728ae22, 0x23ef65cd, - 0xec4d3b2f, 0x8189dbbc, - 0xf348b538, 0xb605d019, - 0xaf194f9b, 0xda6d8118, - 0xa3030242, 0x45706fbe, - 0x4ee4b28c, 0xd5ffb4e2, - 0xf27b896f, 0x3b1696b1, - 0x25c71235, 0xcf692694, - 0x9ef14ad2, 0x384f25e3, - 0x8b8cd5b5, 0x77ac9c65, - 0x592b0275, 0x6ea6e483, - 0xbd41fbd4, 0x831153b5, - 0xee66dfab, 0x2db43210, - 0x98fb213f, 0xbeef0ee4, - 0x3da88fc2, 0x930aa725, - 0xe003826f, 0x0a0e6e70, - 0x46d22ffc, 0x5c26c926, - 0x5ac42aed, 0x9d95b3df, - 0x8baf63de, 0x3c77b2a8, - 0x47edaee6, 0x1482353b, - 0x4cf10364, 0xbc423001, - 0xd0f89791, 0x0654be30, - 0xd6ef5218, 0x5565a910, - 0x5771202a, 0x32bbd1b8, - 0xb8d2d0c8, 0x5141ab53, - 0xdf8eeb99, 0xe19b48a8, - 0xc5c95a63, 0xe3418acb, - 0x7763e373, 0xd6b2b8a3, - 0x5defb2fc, 0x43172f60, - 0xa1f0ab72, 0x1a6439ec, - 0x23631e28, 0xde82bde9, - 0xb2c67915, 0xe372532b, - 0xea26619c, 0x21c0c207, - 0xcde0eb1e, 0xee6ed178, - 0x72176fba, 0xa2c898a6, - 0xbef90dae, 0x131c471b, - 0x23047d84, 0x40c72493, - 0x15c9bebc, 0x9c100d4c, - 0xcb3e42b6, 0xfc657e2a, - 0x3ad6faec, 0x4a475817 +/* Constants for SHA512 from FIPS 180-2:4.2.3. + * SHA256 constants from FIPS 180-2:4.2.2 + * are the most significant half of first 64 elements + * of the same array. + */ +static const uint64_t sha_K[80] = { + 0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, + 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL, + 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, + 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, + 0xd807aa98a3030242ULL, 0x12835b0145706fbeULL, + 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL, + 0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, + 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL, + 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, + 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, + 0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, + 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL, + 0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, + 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL, + 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, + 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, + 0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, + 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL, + 0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, + 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL, + 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, + 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, + 0xd192e819d6ef5218ULL, 0xd69906245565a910ULL, + 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL, + 0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, + 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL, + 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, + 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, + 0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, + 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL, + 0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, + 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL, + 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL, /* [64]+ are used for sha512 only */ + 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, + 0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, + 0x113f9804bef90daeULL, 0x1b710b35131c471bULL, + 0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, + 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL, + 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, + 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL }; -/* Process LEN bytes of BUFFER, accumulating context into CTX. - LEN is rounded _down_ to 64. */ static void FAST_FUNC sha256_process_block64(sha256_ctx_t *ctx) { unsigned t; - uint32_t W[64]; - uint32_t a = ctx->hash[0]; - uint32_t b = ctx->hash[1]; - uint32_t c = ctx->hash[2]; - uint32_t d = ctx->hash[3]; - uint32_t e = ctx->hash[4]; - uint32_t f = ctx->hash[5]; - uint32_t g = ctx->hash[6]; - uint32_t h = ctx->hash[7]; + uint32_t W[64], a, b, c, d, e, f, g, h; const uint32_t *words = (uint32_t*) ctx->wbuffer; /* Operators defined in FIPS 180-2:4.1.2. */ @@ -234,9 +185,24 @@ static void FAST_FUNC sha256_process_block64(sha256_ctx_t *ctx) for (/*t = 16*/; t < 64; ++t) W[t] = R1(W[t - 2]) + W[t - 7] + R0(W[t - 15]) + W[t - 16]; + a = ctx->hash[0]; + b = ctx->hash[1]; + c = ctx->hash[2]; + d = ctx->hash[3]; + e = ctx->hash[4]; + f = ctx->hash[5]; + g = ctx->hash[6]; + h = ctx->hash[7]; + /* The actual computation according to FIPS 180-2:6.2.2 step 3. */ for (t = 0; t < 64; ++t) { - uint32_t T1 = h + S1(e) + Ch(e, f, g) + K256[t] + W[t]; + /* Need to fetch upper half of sha_K[t] */ +#if BB_BIG_ENDIAN + uint32_t K_t = ((uint32_t*)(sha_K + t))[0]; +#else + uint32_t K_t = ((uint32_t*)(sha_K + t))[1]; +#endif + uint32_t T1 = h + S1(e) + Ch(e, f, g) + K_t + W[t]; uint32_t T2 = S0(a) + Maj(a, b, c); h = g; g = f; @@ -264,12 +230,14 @@ static void FAST_FUNC sha256_process_block64(sha256_ctx_t *ctx) ctx->hash[6] += g; ctx->hash[7] += h; } -/* Process LEN bytes of BUFFER, accumulating context into CTX. - LEN is rounded _down_ to 128. */ + static void FAST_FUNC sha512_process_block128(sha512_ctx_t *ctx) { unsigned t; uint64_t W[80]; + /* On i386, having assignments here (not later as sha256 does) + * produces 99 bytes smaller code with gcc 4.3.1 + */ uint64_t a = ctx->hash[0]; uint64_t b = ctx->hash[1]; uint64_t c = ctx->hash[2]; @@ -298,8 +266,7 @@ static void FAST_FUNC sha512_process_block128(sha512_ctx_t *ctx) /* The actual computation according to FIPS 180-2:6.3.2 step 3. */ for (t = 0; t < 80; ++t) { - uint64_t K512_t = ((uint64_t)(K256[t]) << 32) + K512_lo[t]; - uint64_t T1 = h + S1(e) + Ch(e, f, g) + K512_t + W[t]; + uint64_t T1 = h + S1(e) + Ch(e, f, g) + sha_K[t] + W[t]; uint64_t T2 = S0(a) + Maj(a, b, c); h = g; g = f; @@ -360,6 +327,7 @@ static const uint32_t init512_lo[] = { 0xfb41bd6b, 0x137e2179 }; + /* Initialize structure containing state of computation. (FIPS 180-2:5.3.2) */ void FAST_FUNC sha256_begin(sha256_ctx_t *ctx) @@ -368,6 +336,7 @@ void FAST_FUNC sha256_begin(sha256_ctx_t *ctx) ctx->total64 = 0; ctx->process_block = sha256_process_block64; } + /* Initialize structure containing state of computation. (FIPS 180-2:5.3.3) */ void FAST_FUNC sha512_begin(sha512_ctx_t *ctx) @@ -379,10 +348,11 @@ void FAST_FUNC sha512_begin(sha512_ctx_t *ctx) } +/* Used also for sha256 */ void FAST_FUNC sha1_hash(const void *buffer, size_t len, sha1_ctx_t *ctx) { - unsigned in_buf = ctx->total64 & SHA1_MASK; - unsigned add = SHA1_BLOCK_SIZE - in_buf; + unsigned in_buf = ctx->total64 & 63; + unsigned add = 64 - in_buf; ctx->total64 += len; @@ -390,7 +360,7 @@ void FAST_FUNC sha1_hash(const void *buffer, size_t len, sha1_ctx_t *ctx) memcpy(ctx->wbuffer + in_buf, buffer, add); buffer = (const char *)buffer + add; len -= add; - add = SHA1_BLOCK_SIZE; + add = 64; in_buf = 0; ctx->process_block(ctx); } @@ -423,17 +393,18 @@ void FAST_FUNC sha512_hash(const void *buffer, size_t len, sha512_ctx_t *ctx) } +/* Used also for sha256 */ void FAST_FUNC sha1_end(void *resbuf, sha1_ctx_t *ctx) { unsigned i, pad, in_buf; - in_buf = ctx->total64 & SHA1_MASK; + in_buf = ctx->total64 & 63; /* Pad the buffer to the next 64-byte boundary with 0x80,0,0,0... */ ctx->wbuffer[in_buf++] = 0x80; /* This loop iterates either once or twice, no more, no less */ while (1) { - pad = SHA1_BLOCK_SIZE - in_buf; + pad = 64 - in_buf; memset(ctx->wbuffer + in_buf, 0, pad); in_buf = 0; /* Do we have enough space for the length count? */ @@ -442,7 +413,7 @@ void FAST_FUNC sha1_end(void *resbuf, sha1_ctx_t *ctx) uint64_t t = ctx->total64 << 3; t = hton64(t); /* wbuffer is suitably aligned for this */ - *(uint64_t *) (&ctx->wbuffer[SHA1_BLOCK_SIZE - 8]) = t; + *(uint64_t *) (&ctx->wbuffer[64 - 8]) = t; } ctx->process_block(ctx); if (pad >= 8) |