/*- * Copyright 2005 Colin Percival * Copyright 2013 Christian Mehlis & René Kijewski * Copyright 2016 Martin Landsmann * Copyright 2016 OTA keys S.A. * Copyright 2020 HAW Hamburg * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/lib/libmd/sha256.h,v 1.1.2.1 2005/06/24 13:32:25 cperciva Exp $ */ /** * @ingroup sys_hashes * @{ * * @file * @brief Common code for SHA2XX hash functions * * @author Colin Percival * @author Christian Mehlis * @author Rene Kijewski * @author Martin Landsmann * @author Hermann Lelong * * @} */ #include #include #include "hashes/sha2xx_common.h" #ifdef __BIG_ENDIAN__ /* Copy a vector of big-endian uint32_t into a vector of bytes */ #define be32enc_vect memcpy /* Copy a vector of bytes into a vector of big-endian uint32_t */ #define be32dec_vect memcpy #else /* !__BIG_ENDIAN__ */ /* * Encode a length len/4 vector of (uint32_t) into a length len vector of * (unsigned char) in big-endian form. Assumes len is a multiple of 4. */ static void be32enc_vect(void *dst_, const void *src_, size_t len) { /* Assert if len is not a multiple of 4 */ assert(!(len & 3)); if ((uintptr_t)dst_ % sizeof(uint32_t) == 0 && (uintptr_t)src_ % sizeof(uint32_t) == 0) { uint32_t *dst = dst_; const uint32_t *src = src_; for (size_t i = 0; i < len / 4; i++) { dst[i] = __builtin_bswap32(src[i]); } } else { uint8_t *dst = dst_; const uint8_t *src = src_; for (size_t i = 0; i < len; i += 4) { dst[i] = src[i + 3]; dst[i + 1] = src[i + 2]; dst[i + 2] = src[i + 1]; dst[i + 3] = src[i]; } } } /* * Decode a big-endian length len vector of (unsigned char) into a length * len/4 vector of (uint32_t). Assumes len is a multiple of 4. */ #define be32dec_vect be32enc_vect #endif /* __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__ */ /* * SHA256 block compression function. The 256-bit state is transformed via * the 512-bit input block to produce a new state. */ static void sha2xx_transform(uint32_t *state, const unsigned char block[64]) { uint32_t W[64]; uint32_t S[8]; /* 1. Prepare message schedule W. */ be32dec_vect(W, block, 64); for (int i = 16; i < 64; i++) { W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16]; } /* 2. Initialize working variables. */ memcpy(S, state, 32); /* 3. Mix. */ for (int i = 0; i < 64; ++i) { uint32_t e = S[(68 - i) % 8], f = S[(69 - i) % 8]; uint32_t g = S[(70 - i) % 8], h = S[(71 - i) % 8]; uint32_t t0 = h + S1(e) + Ch(e, f, g) + W[i] + K[i]; uint32_t a = S[(64 - i) % 8], b = S[(65 - i) % 8]; uint32_t c = S[(66 - i) % 8], d = S[(67 - i) % 8]; uint32_t t1 = S0(a) + Maj(a, b, c); S[(67 - i) % 8] = d + t0; S[(71 - i) % 8] = t0 + t1; } /* 4. Mix local working variables into global state */ for (int i = 0; i < 8; i++) { state[i] += S[i]; } } static unsigned char PAD[64] = { 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }; /* Add padding and terminating bit-count. */ void sha2xx_pad(sha2xx_context_t *ctx) { /* * Convert length to a vector of bytes -- we do this now rather * than later because the length will change after we pad. */ unsigned char len[8]; be32enc_vect(len, ctx->count, 8); /* Add 1--64 bytes so that the resulting length is 56 mod 64 */ uint32_t r = (ctx->count[1] >> 3) & 0x3f; uint32_t plen = (r < 56) ? (56 - r) : (120 - r); sha2xx_update(ctx, PAD, (size_t) plen); /* Add the terminating bit-count */ sha2xx_update(ctx, len, 8); } /* Add bytes into the hash */ void sha2xx_update(sha2xx_context_t *ctx, const void *data, size_t len) { /* Number of bytes left in the buffer from previous updates */ uint32_t r = (ctx->count[1] >> 3) & 0x3f; /* Convert the length into a number of bits */ uint32_t bitlen1 = ((uint32_t) len) << 3; uint32_t bitlen0 = ((uint32_t) len) >> 29; /* Update number of bits */ if ((ctx->count[1] += bitlen1) < bitlen1) { ctx->count[0]++; } ctx->count[0] += bitlen0; /* Handle the case where we don't need to perform any transforms */ if (len < 64 - r) { if (len > 0) { memcpy(&ctx->buf[r], data, len); } return; } /* Finish the current block */ const unsigned char *src = data; memcpy(&ctx->buf[r], src, 64 - r); sha2xx_transform(ctx->state, ctx->buf); src += 64 - r; len -= 64 - r; /* Perform complete blocks */ while (len >= 64) { sha2xx_transform(ctx->state, src); src += 64; len -= 64; } /* Copy left over data into buffer */ memcpy(ctx->buf, src, len); } /* * SHA-224 finalization. Pads the input data, exports the hash value, * and clears the context state. */ void sha2xx_final(sha2xx_context_t *ctx, void *dst, size_t dig_len) { /* Add padding */ sha2xx_pad(ctx); /* Write the hash */ be32enc_vect(dst, ctx->state, dig_len); /* Clear the context state */ memset((void *) ctx, 0, sizeof(*ctx)); }