diff options
author | Denis Vlasenko <vda.linux@googlemail.com> | 2009-03-12 00:15:51 +0300 |
---|---|---|
committer | Denis Vlasenko <vda.linux@googlemail.com> | 2009-03-12 00:15:51 +0300 |
commit | 98c87f75755c1b53c8bd84f487e4bc7cba359b3e (patch) | |
tree | 7850459b7323f2f6cf338f0022009eea7c43748f /libbb/sha1.c | |
parent | 54ac03a61885c714b4ef606b0a09129b27f72626 (diff) |
sha256/512: code shrink. Run-tested.
function old new delta
sha512_process_block128 - 1444 +1444
sha1_process_block64 - 542 +542
sha256_process_block64 - 529 +529
K512_lo - 320 +320
K256 - 320 +320
init512_lo - 32 +32
init256 - 32 +32
sha1_hash 99 128 +29
sha256_end 160 135 -25
sha1_end 189 160 -29
sha512_end 237 204 -33
sha256_begin 77 44 -33
sha512_begin 154 88 -66
sha256_hash 338 259 -79
sha512_hash 358 262 -96
sha1_compile 542 - -542
sha256_process_block 594 - -594
static.K 896 - -896
sha512_process_block 1861 - -1861
------------------------------------------------------------------------------
(add/remove: 7/4 grow/shrink: 1/7 up/down: 3248/-4254) Total: -1006 bytes
text data bss dec hex filename
808013 468 7856 816337 c74d1 busybox_old
807007 468 7856 815331 c70e3 busybox_unstripped
Diffstat (limited to 'libbb/sha1.c')
-rw-r--r-- | libbb/sha1.c | 537 |
1 files changed, 253 insertions, 284 deletions
diff --git a/libbb/sha1.c b/libbb/sha1.c index 76d5c8fbb..5fc312393 100644 --- a/libbb/sha1.c +++ b/libbb/sha1.c @@ -52,7 +52,7 @@ static inline uint64_t hton64(uint64_t v) #define SHA1_HASH_SIZE SHA1_DIGEST_SIZE #define SHA1_MASK (SHA1_BLOCK_SIZE - 1) -static void sha1_compile(sha1_ctx_t *ctx) +static void sha1_process_block64(sha1_ctx_t *ctx) { uint32_t w[80], i, a, b, c, d, e, t; @@ -60,7 +60,7 @@ static void sha1_compile(sha1_ctx_t *ctx) /* words in big-endian order so an order reversal is needed */ /* here on little endian machines */ for (i = 0; i < SHA1_BLOCK_SIZE / 4; ++i) - w[i] = ntohl(ctx->wbuf[i]); + w[i] = ntohl(ctx->wbuffer[i]); for (/*i = SHA1_BLOCK_SIZE / 4*/; i < 80; ++i) { t = w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16]; @@ -108,31 +108,98 @@ static void sha1_compile(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 +}; + /* Process LEN bytes of BUFFER, accumulating context into CTX. - It is assumed that LEN % 64 == 0. */ -static void sha256_process_block(const void *buffer, size_t len, sha256_ctx_t *ctx) + LEN is rounded _down_ to 64. */ +static void sha256_process_block64(const void *buffer, size_t len, sha256_ctx_t *ctx) { - /* Constants for SHA256 from FIPS 180-2:4.2.2. */ - static const uint32_t 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 - }; const uint32_t *words = buffer; - size_t nwords = len / sizeof(uint32_t); uint32_t a = ctx->H[0]; uint32_t b = ctx->H[1]; uint32_t c = ctx->H[2]; @@ -143,24 +210,17 @@ static void sha256_process_block(const void *buffer, size_t len, sha256_ctx_t *c uint32_t h = ctx->H[7]; /* First increment the byte count. FIPS 180-2 specifies the possible - length of the file up to 2^64 bits. Here we only compute the - number of bytes. Do a double word increment. */ - ctx->total[0] += len; - if (ctx->total[0] < len) - ctx->total[1]++; + length of the file up to 2^64 _bits_. + We compute the number of _bytes_ and convert to bits later. */ + len &= ~(size_t)(sizeof(uint32_t) * 16 - 1); + ctx->total64 += len; /* Process all bytes in the buffer with 64 bytes in each round of the loop. */ - while (nwords > 0) { + len /= (sizeof(uint32_t) * 16); + while (len) { + unsigned t; uint32_t W[64]; - uint32_t a_save = a; - uint32_t b_save = b; - uint32_t c_save = c; - uint32_t d_save = d; - uint32_t e_save = e; - uint32_t f_save = f; - uint32_t g_save = g; - uint32_t h_save = h; /* Operators defined in FIPS 180-2:4.1.2. */ #define Ch(x, y, z) ((x & y) ^ (~x & z)) @@ -171,16 +231,17 @@ static void sha256_process_block(const void *buffer, size_t len, sha256_ctx_t *c #define R1(x) (rotr32(x, 17) ^ rotr32(x, 19) ^ (x >> 10)) /* Compute the message schedule according to FIPS 180-2:6.2.2 step 2. */ - for (unsigned t = 0; t < 16; ++t) { + for (t = 0; t < 16; ++t) { W[t] = ntohl(*words); ++words; } - for (unsigned t = 16; t < 64; ++t) + + for (/*t = 16*/; t < 64; ++t) W[t] = R1(W[t - 2]) + W[t - 7] + R0(W[t - 15]) + W[t - 16]; /* The actual computation according to FIPS 180-2:6.2.2 step 3. */ - for (unsigned t = 0; t < 64; ++t) { - uint32_t T1 = h + S1(e) + Ch(e, f, g) + K[t] + W[t]; + for (t = 0; t < 64; ++t) { + uint32_t T1 = h + S1(e) + Ch(e, f, g) + K256[t] + W[t]; uint32_t T2 = S0(a) + Maj(a, b, c); h = g; g = f; @@ -199,79 +260,24 @@ static void sha256_process_block(const void *buffer, size_t len, sha256_ctx_t *c #undef R1 /* Add the starting values of the context according to FIPS 180-2:6.2.2 step 4. */ - a += a_save; - b += b_save; - c += c_save; - d += d_save; - e += e_save; - f += f_save; - g += g_save; - h += h_save; + ctx->H[0] = a += ctx->H[0]; + ctx->H[1] = b += ctx->H[1]; + ctx->H[2] = c += ctx->H[2]; + ctx->H[3] = d += ctx->H[3]; + ctx->H[4] = e += ctx->H[4]; + ctx->H[5] = f += ctx->H[5]; + ctx->H[6] = g += ctx->H[6]; + ctx->H[7] = h += ctx->H[7]; /* Prepare for the next round. */ - nwords -= 16; + len--; } - - /* Put checksum in context given as argument. */ - ctx->H[0] = a; - ctx->H[1] = b; - ctx->H[2] = c; - ctx->H[3] = d; - ctx->H[4] = e; - ctx->H[5] = f; - ctx->H[6] = g; - ctx->H[7] = h; } - /* Process LEN bytes of BUFFER, accumulating context into CTX. - It is assumed that LEN % 128 == 0. */ -static void sha512_process_block(const void *buffer, size_t len, sha512_ctx_t *ctx) + LEN is rounded _down_ to 128. */ +static void sha512_process_block128(const void *buffer, size_t len, sha512_ctx_t *ctx) { - /* Constants for SHA512 from FIPS 180-2:4.2.3. */ - static const uint64_t 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, - 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, - 0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, - 0x113f9804bef90daeULL, 0x1b710b35131c471bULL, - 0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, - 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL, - 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, - 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL, - }; const uint64_t *words = buffer; - size_t nwords = len / sizeof(uint64_t); uint64_t a = ctx->H[0]; uint64_t b = ctx->H[1]; uint64_t c = ctx->H[2]; @@ -282,24 +288,17 @@ static void sha512_process_block(const void *buffer, size_t len, sha512_ctx_t *c uint64_t h = ctx->H[7]; /* First increment the byte count. FIPS 180-2 specifies the possible - length of the file up to 2^128 bits. Here we only compute the - number of bytes. Do a double word increment. */ - ctx->total[0] += len; - if (ctx->total[0] < len) - ctx->total[1]++; - - /* Process all bytes in the buffer with 128 bytes in each round of - the loop. */ - while (nwords > 0) { + length of the file up to 2^128 _bits_. + We compute the number of _bytes_ and convert to bits later. */ + len &= ~(size_t)(sizeof(uint64_t) * 16 - 1); + ctx->total64[0] += len; + if (ctx->total64[0] < len) + ctx->total64[1]++; + + len /= (sizeof(uint64_t) * 16); + while (len) { + unsigned t; uint64_t W[80]; - uint64_t a_save = a; - uint64_t b_save = b; - uint64_t c_save = c; - uint64_t d_save = d; - uint64_t e_save = e; - uint64_t f_save = f; - uint64_t g_save = g; - uint64_t h_save = h; /* Operators defined in FIPS 180-2:4.1.2. */ #define Ch(x, y, z) ((x & y) ^ (~x & z)) @@ -310,16 +309,17 @@ static void sha512_process_block(const void *buffer, size_t len, sha512_ctx_t *c #define R1(x) (rotr64(x, 19) ^ rotr64(x, 61) ^ (x >> 6)) /* Compute the message schedule according to FIPS 180-2:6.3.2 step 2. */ - for (unsigned t = 0; t < 16; ++t) { + for (t = 0; t < 16; ++t) { W[t] = ntoh64(*words); ++words; } - for (unsigned t = 16; t < 80; ++t) + for (/*t = 16*/; t < 80; ++t) W[t] = R1(W[t - 2]) + W[t - 7] + R0(W[t - 15]) + W[t - 16]; /* The actual computation according to FIPS 180-2:6.3.2 step 3. */ - for (unsigned t = 0; t < 80; ++t) { - uint64_t T1 = h + S1(e) + Ch(e, f, g) + K[t] + W[t]; + 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 T2 = S0(a) + Maj(a, b, c); h = g; g = f; @@ -338,34 +338,23 @@ static void sha512_process_block(const void *buffer, size_t len, sha512_ctx_t *c #undef R1 /* Add the starting values of the context according to FIPS 180-2:6.3.2 step 4. */ - a += a_save; - b += b_save; - c += c_save; - d += d_save; - e += e_save; - f += f_save; - g += g_save; - h += h_save; - - /* Prepare for the next round. */ - nwords -= 16; + ctx->H[0] = a += ctx->H[0]; + ctx->H[1] = b += ctx->H[1]; + ctx->H[2] = c += ctx->H[2]; + ctx->H[3] = d += ctx->H[3]; + ctx->H[4] = e += ctx->H[4]; + ctx->H[5] = f += ctx->H[5]; + ctx->H[6] = g += ctx->H[6]; + ctx->H[7] = h += ctx->H[7]; + + len--; } - - /* Put checksum in context given as argument. */ - ctx->H[0] = a; - ctx->H[1] = b; - ctx->H[2] = c; - ctx->H[3] = d; - ctx->H[4] = e; - ctx->H[5] = f; - ctx->H[6] = g; - ctx->H[7] = h; } void FAST_FUNC sha1_begin(sha1_ctx_t *ctx) { - ctx->count[0] = ctx->count[1] = 0; + ctx->total64 = 0; ctx->hash[0] = 0x67452301; ctx->hash[1] = 0xefcdab89; ctx->hash[2] = 0x98badcfe; @@ -373,84 +362,92 @@ void FAST_FUNC sha1_begin(sha1_ctx_t *ctx) ctx->hash[4] = 0xc3d2e1f0; } +static const uint32_t init256[] = { + 0x6a09e667, + 0xbb67ae85, + 0x3c6ef372, + 0xa54ff53a, + 0x510e527f, + 0x9b05688c, + 0x1f83d9ab, + 0x5be0cd19 +}; +static const uint32_t init512_lo[] = { + 0xf3bcc908, + 0x84caa73b, + 0xfe94f82b, + 0x5f1d36f1, + 0xade682d1, + 0x2b3e6c1f, + 0xfb41bd6b, + 0x137e2179 +}; /* Initialize structure containing state of computation. (FIPS 180-2:5.3.2) */ void FAST_FUNC sha256_begin(sha256_ctx_t *ctx) { - ctx->H[0] = 0x6a09e667; - ctx->H[1] = 0xbb67ae85; - ctx->H[2] = 0x3c6ef372; - ctx->H[3] = 0xa54ff53a; - ctx->H[4] = 0x510e527f; - ctx->H[5] = 0x9b05688c; - ctx->H[6] = 0x1f83d9ab; - ctx->H[7] = 0x5be0cd19; - ctx->total[0] = ctx->total[1] = 0; - ctx->buflen = 0; + memcpy(ctx->H, init256, sizeof(init256)); + ctx->total64 = 0; + ctx->wbuflen = 0; } - /* Initialize structure containing state of computation. (FIPS 180-2:5.3.3) */ void FAST_FUNC sha512_begin(sha512_ctx_t *ctx) { - ctx->H[0] = 0x6a09e667f3bcc908ULL; - ctx->H[1] = 0xbb67ae8584caa73bULL; - ctx->H[2] = 0x3c6ef372fe94f82bULL; - ctx->H[3] = 0xa54ff53a5f1d36f1ULL; - ctx->H[4] = 0x510e527fade682d1ULL; - ctx->H[5] = 0x9b05688c2b3e6c1fULL; - ctx->H[6] = 0x1f83d9abfb41bd6bULL; - ctx->H[7] = 0x5be0cd19137e2179ULL; - ctx->total[0] = ctx->total[1] = 0; - ctx->buflen = 0; + int i; + for (i = 0; i < 8; i++) + ctx->H[i] = ((uint64_t)(init256[i]) << 32) + init512_lo[i]; + ctx->total64[0] = ctx->total64[1] = 0; + ctx->wbuflen = 0; } /* SHA1 hash data in an array of bytes into hash buffer and call the */ /* hash_compile function as required. */ -void FAST_FUNC sha1_hash(const void *data, size_t length, sha1_ctx_t *ctx) +void FAST_FUNC sha1_hash(const void *buffer, size_t len, sha1_ctx_t *ctx) { - uint32_t pos = (uint32_t) (ctx->count[0] & SHA1_MASK); + uint32_t pos = (uint32_t) (ctx->total64 & SHA1_MASK); uint32_t freeb = SHA1_BLOCK_SIZE - pos; - const unsigned char *sp = data; + const unsigned char *sp = buffer; - ctx->count[0] += length; - if (ctx->count[0] < length) - ctx->count[1]++; + ctx->total64 += len; - while (length >= freeb) { /* transfer whole blocks while possible */ - memcpy(((unsigned char *) ctx->wbuf) + pos, sp, freeb); + while (len >= freeb) { /* transfer whole blocks while possible */ + memcpy(((unsigned char *) ctx->wbuffer) + pos, sp, freeb); sp += freeb; - length -= freeb; + len -= freeb; freeb = SHA1_BLOCK_SIZE; pos = 0; - sha1_compile(ctx); + sha1_process_block64(ctx); } - memcpy(((unsigned char *) ctx->wbuf) + pos, sp, length); + memcpy(((unsigned char *) ctx->wbuffer) + pos, sp, len); } void FAST_FUNC sha256_hash(const void *buffer, size_t len, sha256_ctx_t *ctx) { /* When we already have some bits in our internal buffer concatenate both inputs first. */ - if (ctx->buflen != 0) { - size_t left_over = ctx->buflen; - size_t add = 128 - left_over > len ? len : 128 - left_over; - - memcpy(&ctx->buffer[left_over], buffer, add); - ctx->buflen += add; - - if (ctx->buflen > 64) { - sha256_process_block(ctx->buffer, ctx->buflen & ~63, ctx); - - ctx->buflen &= 63; - /* The regions in the following copy operation cannot overlap. */ - memcpy(ctx->buffer, - &ctx->buffer[(left_over + add) & ~63], - ctx->buflen); - } - + if (ctx->wbuflen != 0) { + unsigned add; + + /* NB: 1/2 of wbuffer is used only in sha256_end + * when length field is added and hashed. + * With buffer twice as small, it may happen that + * we have it almost full and can't add length field. */ + + add = sizeof(ctx->wbuffer)/2 - ctx->wbuflen; + if (add > len) + add = len; + memcpy(&ctx->wbuffer[ctx->wbuflen], buffer, add); + ctx->wbuflen += add; + + /* If we still didn't collect full wbuffer, bail out */ + if (ctx->wbuflen < sizeof(ctx->wbuffer)/2) + return; + + sha256_process_block64(ctx->wbuffer, 64, ctx); + ctx->wbuflen = 0; buffer = (const char *)buffer + add; len -= add; } @@ -459,13 +456,12 @@ void FAST_FUNC sha256_hash(const void *buffer, size_t len, sha256_ctx_t *ctx) if (len >= 64) { if (UNALIGNED_P(buffer, uint32_t)) { while (len > 64) { - sha256_process_block(memcpy(ctx->buffer, buffer, 64), - 64, ctx); + sha256_process_block64(memcpy(ctx->wbuffer, buffer, 64), 64, ctx); buffer = (const char *)buffer + 64; len -= 64; } } else { - sha256_process_block(buffer, len & ~63, ctx); + sha256_process_block64(buffer, len /*& ~63*/, ctx); buffer = (const char *)buffer + (len & ~63); len &= 63; } @@ -473,75 +469,48 @@ void FAST_FUNC sha256_hash(const void *buffer, size_t len, sha256_ctx_t *ctx) /* Move remaining bytes into internal buffer. */ if (len > 0) { - size_t left_over = ctx->buflen; - - memcpy(&ctx->buffer[left_over], buffer, len); - left_over += len; - if (left_over >= 64) { - sha256_process_block(ctx->buffer, 64, ctx); - left_over -= 64; - memcpy(ctx->buffer, &ctx->buffer[64], left_over); - } - ctx->buflen = left_over; + memcpy(ctx->wbuffer, buffer, len); + ctx->wbuflen = len; } } void FAST_FUNC sha512_hash(const void *buffer, size_t len, sha512_ctx_t *ctx) { - /* When we already have some bits in our internal buffer concatenate - both inputs first. */ - if (ctx->buflen != 0) { - size_t left_over = ctx->buflen; - size_t add = 256 - left_over > len ? len : 256 - left_over; + if (ctx->wbuflen != 0) { + unsigned add; - memcpy(&ctx->buffer[left_over], buffer, add); - ctx->buflen += add; + add = sizeof(ctx->wbuffer)/2 - ctx->wbuflen; + if (add > len) + add = len; + memcpy(&ctx->wbuffer[ctx->wbuflen], buffer, add); + ctx->wbuflen += add; - if (ctx->buflen > 128) { - sha512_process_block(ctx->buffer, ctx->buflen & ~127, ctx); - - ctx->buflen &= 127; - /* The regions in the following copy operation cannot overlap. */ - memcpy(ctx->buffer, - &ctx->buffer[(left_over + add) & ~127], - ctx->buflen); - } + if (ctx->wbuflen < sizeof(ctx->wbuffer)/2) + return; + sha512_process_block128(ctx->wbuffer, 128, ctx); + ctx->wbuflen = 0; buffer = (const char *)buffer + add; len -= add; } - /* Process available complete blocks. */ if (len >= 128) { -// #if BB_ARCH_REQUIRES_ALIGNMENT if (UNALIGNED_P(buffer, uint64_t)) { while (len > 128) { - sha512_process_block(memcpy(ctx->buffer, buffer, 128), - 128, ctx); + sha512_process_block128(memcpy(ctx->wbuffer, buffer, 128), 128, ctx); buffer = (const char *)buffer + 128; len -= 128; } - } else -// #endif - { - sha512_process_block(buffer, len & ~127, ctx); + } else { + sha512_process_block128(buffer, len /*& ~127*/, ctx); buffer = (const char *)buffer + (len & ~127); len &= 127; } } - /* Move remaining bytes into internal buffer. */ if (len > 0) { - size_t left_over = ctx->buflen; - - memcpy(&ctx->buffer[left_over], buffer, len); - left_over += len; - if (left_over >= 128) { - sha512_process_block(ctx->buffer, 128, ctx); - left_over -= 128; - memcpy(ctx->buffer, &ctx->buffer[128], left_over); - } - ctx->buflen = left_over; + memcpy(ctx->wbuffer, buffer, len); + ctx->wbuflen = len; } } @@ -558,36 +527,40 @@ void FAST_FUNC sha1_end(void *resbuf, sha1_ctx_t *ctx) #endif uint8_t *hval = resbuf; - uint32_t i, cnt = (uint32_t) (ctx->count[0] & SHA1_MASK); + uint32_t i, cnt = (uint32_t) (ctx->total64 & SHA1_MASK); /* mask out the rest of any partial 32-bit word and then set */ /* the next byte to 0x80. On big-endian machines any bytes in */ /* the buffer will be at the top end of 32 bit words, on little */ /* endian machines they will be at the bottom. Hence the AND */ /* and OR masks above are reversed for little endian systems */ - ctx->wbuf[cnt >> 2] = - (ctx->wbuf[cnt >> 2] & mask[cnt & 3]) | bits[cnt & 3]; + ctx->wbuffer[cnt >> 2] = + (ctx->wbuffer[cnt >> 2] & mask[cnt & 3]) | bits[cnt & 3]; /* we need 9 or more empty positions, one for the padding byte */ /* (above) and eight for the length count. If there is not */ /* enough space pad and empty the buffer */ if (cnt > SHA1_BLOCK_SIZE - 9) { if (cnt < 60) - ctx->wbuf[15] = 0; - sha1_compile(ctx); + ctx->wbuffer[15] = 0; + sha1_process_block64(ctx); cnt = 0; } else /* compute a word index for the empty buffer positions */ cnt = (cnt >> 2) + 1; while (cnt < 14) /* and zero pad all but last two positions */ - ctx->wbuf[cnt++] = 0; + ctx->wbuffer[cnt++] = 0; - /* assemble the eight byte counter in the buffer in big-endian */ + /* assemble the 64-bit counter of bits in the buffer in BE */ /* format */ - ctx->wbuf[14] = htonl((ctx->count[1] << 3) | (ctx->count[0] >> 29)); - ctx->wbuf[15] = htonl(ctx->count[0] << 3); + { + uint64_t t = ctx->total64 << 3; + t = hton64(t); + /* wbuffer is suitably aligned for this */ + *(uint64_t *) &ctx->wbuffer[14] = t; + } - sha1_compile(ctx); + sha1_process_block64(ctx); /* extract the hash value as bytes in case the hash buffer is */ /* misaligned for 32-bit words */ @@ -604,28 +577,29 @@ void FAST_FUNC sha1_end(void *resbuf, sha1_ctx_t *ctx) void FAST_FUNC sha256_end(void *resbuf, sha256_ctx_t *ctx) { /* Take yet unprocessed bytes into account. */ - uint32_t bytes = ctx->buflen; - size_t pad; + unsigned bytes = ctx->wbuflen; + unsigned pad; /* Now count remaining bytes. */ - ctx->total[0] += bytes; - if (ctx->total[0] < bytes) - ctx->total[1]++; + ctx->total64 += bytes; /* Pad the buffer to the next 64-byte boundary with 0x80,0,0,0... (FIPS 180-2:5.1.1) */ pad = (bytes >= 56 ? 64 + 56 - bytes : 56 - bytes); - memset(&ctx->buffer[bytes], 0, pad); - ctx->buffer[bytes] = 0x80; + memset(&ctx->wbuffer[bytes], 0, pad); + ctx->wbuffer[bytes] = 0x80; /* Put the 64-bit file length in *bits* at the end of the buffer. */ - *(uint32_t *) &ctx->buffer[bytes + pad + 4] = ntohl(ctx->total[0] << 3); - *(uint32_t *) &ctx->buffer[bytes + pad] = ntohl((ctx->total[1] << 3) | (ctx->total[0] >> 29)); + { + uint64_t t = ctx->total64 << 3; + t = hton64(t); + /* wbuffer is suitably aligned for this */ + *(uint64_t *) &ctx->wbuffer[bytes + pad] = t; + } /* Process last bytes. */ - sha256_process_block(ctx->buffer, bytes + pad + 8, ctx); + sha256_process_block64(ctx->wbuffer, bytes + pad + 8, ctx); - /* Put result from CTX in first 32 bytes following RESBUF. */ for (unsigned i = 0; i < 8; ++i) ((uint32_t *) resbuf)[i] = ntohl(ctx->H[i]); } @@ -637,29 +611,24 @@ void FAST_FUNC sha256_end(void *resbuf, sha256_ctx_t *ctx) aligned for a 64 bits value. */ void FAST_FUNC sha512_end(void *resbuf, sha512_ctx_t *ctx) { - /* Take yet unprocessed bytes into account. */ - uint64_t bytes = ctx->buflen; - size_t pad; + unsigned bytes = ctx->wbuflen; + unsigned pad; - /* Now count remaining bytes. */ - ctx->total[0] += bytes; - if (ctx->total[0] < bytes) - ctx->total[1]++; + ctx->total64[0] += bytes; + if (ctx->total64[0] < bytes) + ctx->total64[1]++; /* Pad the buffer to the next 128-byte boundary with 0x80,0,0,0... (FIPS 180-2:5.1.2) */ pad = bytes >= 112 ? 128 + 112 - bytes : 112 - bytes; - memset(&ctx->buffer[bytes], 0, pad); - ctx->buffer[bytes] = 0x80; + memset(&ctx->wbuffer[bytes], 0, pad); + ctx->wbuffer[bytes] = 0x80; - /* Put the 128-bit file length in *bits* at the end of the buffer. */ - *(uint64_t *) &ctx->buffer[bytes + pad + 8] = hton64(ctx->total[0] << 3); - *(uint64_t *) &ctx->buffer[bytes + pad] = hton64((ctx->total[1] << 3) | (ctx->total[0] >> 61)); + *(uint64_t *) &ctx->wbuffer[bytes + pad + 8] = hton64(ctx->total64[0] << 3); + *(uint64_t *) &ctx->wbuffer[bytes + pad] = hton64((ctx->total64[1] << 3) | (ctx->total64[0] >> 61)); - /* Process last bytes. */ - sha512_process_block(ctx->buffer, bytes + pad + 16, ctx); + sha512_process_block128(ctx->wbuffer, bytes + pad + 16, ctx); - /* Put result from CTX in first 64 bytes following RESBUF. */ for (unsigned i = 0; i < 8; ++i) ((uint64_t *) resbuf)[i] = hton64(ctx->H[i]); } |