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Diffstat (limited to 'lib/util/sha2.c')
| -rw-r--r-- | lib/util/sha2.c | 515 |
1 files changed, 515 insertions, 0 deletions
diff --git a/lib/util/sha2.c b/lib/util/sha2.c new file mode 100644 index 0000000..a9e3857 --- /dev/null +++ b/lib/util/sha2.c @@ -0,0 +1,515 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2013-2015 Todd C. Miller <Todd.Miller@sudo.ws> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +/* + * Implementation of SHA-224, SHA-256, SHA-384 and SHA-512 + * as per FIPS 180-4: Secure Hash Standard (SHS) + * http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf + * + * Derived from the public domain SHA-1 and SHA-2 implementations + * by Steve Reid and Wei Dai respectively. + */ + +#include <config.h> +#include <string.h> +#if defined(HAVE_STDINT_H) +# include <stdint.h> +#elif defined(HAVE_INTTYPES_H) +# include <inttypes.h> +#endif +#if defined(HAVE_ENDIAN_H) +# include <endian.h> +#elif defined(HAVE_SYS_ENDIAN_H) +# include <sys/endian.h> +#elif defined(HAVE_MACHINE_ENDIAN_H) +# include <machine/endian.h> +#else +# include "compat/endian.h" +#endif + +#include "sudo_compat.h" +#include "compat/sha2.h" + +/* + * SHA-2 operates on 32-bit and 64-bit words in big endian byte order. + * The following macros convert between character arrays and big endian words. + */ +#define BE8TO32(x, y) do { \ + (x) = (((uint32_t)((y)[0] & 255) << 24) | \ + ((uint32_t)((y)[1] & 255) << 16) | \ + ((uint32_t)((y)[2] & 255) << 8) | \ + ((uint32_t)((y)[3] & 255))); \ +} while (0) + +#define BE8TO64(x, y) do { \ + (x) = (((uint64_t)((y)[0] & 255) << 56) | \ + ((uint64_t)((y)[1] & 255) << 48) | \ + ((uint64_t)((y)[2] & 255) << 40) | \ + ((uint64_t)((y)[3] & 255) << 32) | \ + ((uint64_t)((y)[4] & 255) << 24) | \ + ((uint64_t)((y)[5] & 255) << 16) | \ + ((uint64_t)((y)[6] & 255) << 8) | \ + ((uint64_t)((y)[7] & 255))); \ +} while (0) + +#define BE32TO8(x, y) do { \ + (x)[0] = (uint8_t)(((y) >> 24) & 255); \ + (x)[1] = (uint8_t)(((y) >> 16) & 255); \ + (x)[2] = (uint8_t)(((y) >> 8) & 255); \ + (x)[3] = (uint8_t)((y) & 255); \ +} while (0) + +#define BE64TO8(x, y) do { \ + (x)[0] = (uint8_t)(((y) >> 56) & 255); \ + (x)[1] = (uint8_t)(((y) >> 48) & 255); \ + (x)[2] = (uint8_t)(((y) >> 40) & 255); \ + (x)[3] = (uint8_t)(((y) >> 32) & 255); \ + (x)[4] = (uint8_t)(((y) >> 24) & 255); \ + (x)[5] = (uint8_t)(((y) >> 16) & 255); \ + (x)[6] = (uint8_t)(((y) >> 8) & 255); \ + (x)[7] = (uint8_t)((y) & 255); \ +} while (0) + +#define rotrFixed(x,y) (y ? ((x>>y) | (x<<(sizeof(x)*8-y))) : x) + +#define blk0(i) (W[i]) +#define blk2(i) (W[i&15]+=s1(W[(i-2)&15])+W[(i-7)&15]+s0(W[(i-15)&15])) + +#define Ch(x,y,z) (z^(x&(y^z))) +#define Maj(x,y,z) (y^((x^y)&(y^z))) + +#define a(i) T[(0-i)&7] +#define b(i) T[(1-i)&7] +#define c(i) T[(2-i)&7] +#define d(i) T[(3-i)&7] +#define e(i) T[(4-i)&7] +#define f(i) T[(5-i)&7] +#define g(i) T[(6-i)&7] +#define h(i) T[(7-i)&7] + +void +SHA224Init(SHA2_CTX *ctx) +{ + memset(ctx, 0, sizeof(*ctx)); + ctx->state.st32[0] = 0xc1059ed8UL; + ctx->state.st32[1] = 0x367cd507UL; + ctx->state.st32[2] = 0x3070dd17UL; + ctx->state.st32[3] = 0xf70e5939UL; + ctx->state.st32[4] = 0xffc00b31UL; + ctx->state.st32[5] = 0x68581511UL; + ctx->state.st32[6] = 0x64f98fa7UL; + ctx->state.st32[7] = 0xbefa4fa4UL; +} + +void +SHA224Transform(uint32_t state[8], const uint8_t buffer[SHA224_BLOCK_LENGTH]) +{ + SHA256Transform(state, buffer); +} + +void +SHA224Update(SHA2_CTX *ctx, const uint8_t *data, size_t len) +{ + SHA256Update(ctx, data, len); +} + +void +SHA224Pad(SHA2_CTX *ctx) +{ + SHA256Pad(ctx); +} + +void +SHA224Final(uint8_t digest[SHA224_DIGEST_LENGTH], SHA2_CTX *ctx) +{ + SHA256Pad(ctx); + if (digest != NULL) { +#if BYTE_ORDER == BIG_ENDIAN + memcpy(digest, ctx->state.st32, SHA224_DIGEST_LENGTH); +#else + unsigned int i; + + for (i = 0; i < 7; i++) + BE32TO8(digest + (i * 4), ctx->state.st32[i]); +#endif + memset(ctx, 0, sizeof(*ctx)); + } +} + +static const uint32_t SHA256_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 +}; + +void +SHA256Init(SHA2_CTX *ctx) +{ + memset(ctx, 0, sizeof(*ctx)); + ctx->state.st32[0] = 0x6a09e667UL; + ctx->state.st32[1] = 0xbb67ae85UL; + ctx->state.st32[2] = 0x3c6ef372UL; + ctx->state.st32[3] = 0xa54ff53aUL; + ctx->state.st32[4] = 0x510e527fUL; + ctx->state.st32[5] = 0x9b05688cUL; + ctx->state.st32[6] = 0x1f83d9abUL; + ctx->state.st32[7] = 0x5be0cd19UL; +} + +/* Round macros for SHA256 */ +#define R(i) do { \ + h(i)+=S1(e(i))+Ch(e(i),f(i),g(i))+SHA256_K[i+j]+(j?blk2(i):blk0(i)); \ + d(i)+=h(i); \ + h(i)+=S0(a(i))+Maj(a(i),b(i),c(i)); \ +} while (0) + +#define S0(x) (rotrFixed(x,2)^rotrFixed(x,13)^rotrFixed(x,22)) +#define S1(x) (rotrFixed(x,6)^rotrFixed(x,11)^rotrFixed(x,25)) +#define s0(x) (rotrFixed(x,7)^rotrFixed(x,18)^(x>>3)) +#define s1(x) (rotrFixed(x,17)^rotrFixed(x,19)^(x>>10)) + +void +SHA256Transform(uint32_t state[8], const uint8_t data[SHA256_BLOCK_LENGTH]) +{ + uint32_t W[16]; + uint32_t T[8]; + unsigned int j; + + /* Copy context state to working vars. */ + memcpy(T, state, sizeof(T)); + /* Copy data to W in big endian format. */ +#if BYTE_ORDER == BIG_ENDIAN + memcpy(W, data, sizeof(W)); +#else + for (j = 0; j < 16; j++) { + BE8TO32(W[j], data); + data += 4; + } +#endif + /* 64 operations, partially loop unrolled. */ + for (j = 0; j < 64; j += 16) + { + R( 0); R( 1); R( 2); R( 3); + R( 4); R( 5); R( 6); R( 7); + R( 8); R( 9); R(10); R(11); + R(12); R(13); R(14); R(15); + } + /* Add the working vars back into context state. */ + state[0] += a(0); + state[1] += b(0); + state[2] += c(0); + state[3] += d(0); + state[4] += e(0); + state[5] += f(0); + state[6] += g(0); + state[7] += h(0); + /* Cleanup */ + explicit_bzero(T, sizeof(T)); + explicit_bzero(W, sizeof(W)); +} + +#undef S0 +#undef S1 +#undef s0 +#undef s1 +#undef R + +void +SHA256Update(SHA2_CTX *ctx, const uint8_t *data, size_t len) +{ + size_t i = 0, j; + + j = (size_t)((ctx->count[0] >> 3) & (SHA256_BLOCK_LENGTH - 1)); + ctx->count[0] += ((uint64_t)len << 3); + if ((j + len) > SHA256_BLOCK_LENGTH - 1) { + memcpy(&ctx->buffer[j], data, (i = SHA256_BLOCK_LENGTH - j)); + SHA256Transform(ctx->state.st32, ctx->buffer); + for ( ; i + SHA256_BLOCK_LENGTH - 1 < len; i += SHA256_BLOCK_LENGTH) + SHA256Transform(ctx->state.st32, (uint8_t *)&data[i]); + j = 0; + } + memcpy(&ctx->buffer[j], &data[i], len - i); +} + +void +SHA256Pad(SHA2_CTX *ctx) +{ + uint8_t finalcount[8]; + + /* Store unpadded message length in bits in big endian format. */ + BE64TO8(finalcount, ctx->count[0]); + + /* Append a '1' bit (0x80) to the message. */ + SHA256Update(ctx, (uint8_t *)"\200", 1); + + /* Pad message such that the resulting length modulo 512 is 448. */ + while ((ctx->count[0] & 511) != 448) + SHA256Update(ctx, (uint8_t *)"\0", 1); + + /* Append length of message in bits and do final SHA256Transform(). */ + SHA256Update(ctx, finalcount, sizeof(finalcount)); +} + +void +SHA256Final(uint8_t digest[SHA256_DIGEST_LENGTH], SHA2_CTX *ctx) +{ + SHA256Pad(ctx); + if (digest != NULL) { +#if BYTE_ORDER == BIG_ENDIAN + memcpy(digest, ctx->state.st32, SHA256_DIGEST_LENGTH); +#else + unsigned int i; + + for (i = 0; i < 8; i++) + BE32TO8(digest + (i * 4), ctx->state.st32[i]); +#endif + memset(ctx, 0, sizeof(*ctx)); + } +} + +void +SHA384Init(SHA2_CTX *ctx) +{ + memset(ctx, 0, sizeof(*ctx)); + ctx->state.st64[0] = 0xcbbb9d5dc1059ed8ULL; + ctx->state.st64[1] = 0x629a292a367cd507ULL; + ctx->state.st64[2] = 0x9159015a3070dd17ULL; + ctx->state.st64[3] = 0x152fecd8f70e5939ULL; + ctx->state.st64[4] = 0x67332667ffc00b31ULL; + ctx->state.st64[5] = 0x8eb44a8768581511ULL; + ctx->state.st64[6] = 0xdb0c2e0d64f98fa7ULL; + ctx->state.st64[7] = 0x47b5481dbefa4fa4ULL; +} + +void +SHA384Transform(uint64_t state[8], const uint8_t data[SHA384_BLOCK_LENGTH]) +{ + SHA512Transform(state, data); +} + +void +SHA384Update(SHA2_CTX *ctx, const uint8_t *data, size_t len) +{ + SHA512Update(ctx, data, len); +} + +void +SHA384Pad(SHA2_CTX *ctx) +{ + SHA512Pad(ctx); +} + +void +SHA384Final(uint8_t digest[SHA384_DIGEST_LENGTH], SHA2_CTX *ctx) +{ + SHA384Pad(ctx); + if (digest != NULL) { +#if BYTE_ORDER == BIG_ENDIAN + memcpy(digest, ctx->state.st64, SHA384_DIGEST_LENGTH); +#else + unsigned int i; + + for (i = 0; i < 6; i++) + BE64TO8(digest + (i * 8), ctx->state.st64[i]); +#endif + memset(ctx, 0, sizeof(*ctx)); + } +} + +static const uint64_t SHA512_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 +}; + +void +SHA512Init(SHA2_CTX *ctx) +{ + memset(ctx, 0, sizeof(*ctx)); + ctx->state.st64[0] = 0x6a09e667f3bcc908ULL; + ctx->state.st64[1] = 0xbb67ae8584caa73bULL; + ctx->state.st64[2] = 0x3c6ef372fe94f82bULL; + ctx->state.st64[3] = 0xa54ff53a5f1d36f1ULL; + ctx->state.st64[4] = 0x510e527fade682d1ULL; + ctx->state.st64[5] = 0x9b05688c2b3e6c1fULL; + ctx->state.st64[6] = 0x1f83d9abfb41bd6bULL; + ctx->state.st64[7] = 0x5be0cd19137e2179ULL; +} + +/* Round macros for SHA512 */ +#define R(i) do { \ + h(i)+=S1(e(i))+Ch(e(i),f(i),g(i))+SHA512_K[i+j]+(j?blk2(i):blk0(i)); \ + d(i)+=h(i); \ + h(i)+=S0(a(i))+Maj(a(i),b(i),c(i)); \ +} while (0) + +#define S0(x) (rotrFixed(x,28)^rotrFixed(x,34)^rotrFixed(x,39)) +#define S1(x) (rotrFixed(x,14)^rotrFixed(x,18)^rotrFixed(x,41)) +#define s0(x) (rotrFixed(x,1)^rotrFixed(x,8)^(x>>7)) +#define s1(x) (rotrFixed(x,19)^rotrFixed(x,61)^(x>>6)) + +void +SHA512Transform(uint64_t state[8], const uint8_t data[SHA512_BLOCK_LENGTH]) +{ + uint64_t W[16]; + uint64_t T[8]; + unsigned int j; + + /* Copy context state to working vars. */ + memcpy(T, state, sizeof(T)); + /* Copy data to W in big endian format. */ +#if BYTE_ORDER == BIG_ENDIAN + memcpy(W, data, sizeof(W)); +#else + for (j = 0; j < 16; j++) { + BE8TO64(W[j], data); + data += 8; + } +#endif + /* 80 operations, partially loop unrolled. */ + for (j = 0; j < 80; j += 16) + { + R( 0); R( 1); R( 2); R( 3); + R( 4); R( 5); R( 6); R( 7); + R( 8); R( 9); R(10); R(11); + R(12); R(13); R(14); R(15); + } + /* Add the working vars back into context state. */ + state[0] += a(0); + state[1] += b(0); + state[2] += c(0); + state[3] += d(0); + state[4] += e(0); + state[5] += f(0); + state[6] += g(0); + state[7] += h(0); + /* Cleanup. */ + explicit_bzero(T, sizeof(T)); + explicit_bzero(W, sizeof(W)); +} + +void +SHA512Update(SHA2_CTX *ctx, const uint8_t *data, size_t len) +{ + size_t i = 0, j; + + j = (size_t)((ctx->count[0] >> 3) & (SHA512_BLOCK_LENGTH - 1)); + ctx->count[0] += ((uint64_t)len << 3); + if (ctx->count[0] < ((uint64_t)len << 3)) + ctx->count[1]++; + if ((j + len) > SHA512_BLOCK_LENGTH - 1) { + memcpy(&ctx->buffer[j], data, (i = SHA512_BLOCK_LENGTH - j)); + SHA512Transform(ctx->state.st64, ctx->buffer); + for ( ; i + SHA512_BLOCK_LENGTH - 1 < len; i += SHA512_BLOCK_LENGTH) + SHA512Transform(ctx->state.st64, (uint8_t *)&data[i]); + j = 0; + } + memcpy(&ctx->buffer[j], &data[i], len - i); +} + +void +SHA512Pad(SHA2_CTX *ctx) +{ + uint8_t finalcount[16]; + + /* Store unpadded message length in bits in big endian format. */ + BE64TO8(finalcount, ctx->count[1]); + BE64TO8(finalcount + 8, ctx->count[0]); + + /* Append a '1' bit (0x80) to the message. */ + SHA512Update(ctx, (uint8_t *)"\200", 1); + + /* Pad message such that the resulting length modulo 1024 is 896. */ + while ((ctx->count[0] & 1023) != 896) + SHA512Update(ctx, (uint8_t *)"\0", 1); + + /* Append length of message in bits and do final SHA512Transform(). */ + SHA512Update(ctx, finalcount, sizeof(finalcount)); +} + +void +SHA512Final(uint8_t digest[SHA512_DIGEST_LENGTH], SHA2_CTX *ctx) +{ + SHA512Pad(ctx); + if (digest != NULL) { +#if BYTE_ORDER == BIG_ENDIAN + memcpy(digest, ctx->state.st64, SHA512_DIGEST_LENGTH); +#else + unsigned int i; + + for (i = 0; i < 8; i++) + BE64TO8(digest + (i * 8), ctx->state.st64[i]); +#endif + memset(ctx, 0, sizeof(*ctx)); + } +} |