mirror of
https://github.com/RIOT-OS/RIOT.git
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258 lines
8.2 KiB
C
258 lines
8.2 KiB
C
/*
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* Copyright (C) 2023 TU Dresden
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup sys_hashes_sha512_common SHA-512 common
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* @ingroup sys_hashes_unkeyed
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* @brief Implementation of common functionality for SHA-512-based hashing functions
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* @{
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*
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* @file
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* @brief Common code for SHA-512-based hash functions
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*
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* @author Mikolai Gütschow <mikolai.guetschow@tu-dresden.de>
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*
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* @}
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*/
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#include <stdint.h>
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#include <assert.h>
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#include "hashes/sha512_common.h"
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#ifdef __BIG_ENDIAN__
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/* Copy a vector of big-endian uint32_t into a vector of bytes */
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#define be64enc_vect memcpy
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/* Copy a vector of bytes into a vector of big-endian uint32_t */
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#define be64dec_vect memcpy
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#else /* !__BIG_ENDIAN__ */
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/*
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* Encode a length ceil(len/8) vector of (uint64_t) into a length len vector of
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* (unsigned char) in big-endian form.
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*/
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static void be64enc_vect(void *dst_, const void *src_, size_t len)
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{
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size_t i;
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if ((uintptr_t)dst_ % sizeof(uint64_t) == 0 &&
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(uintptr_t)src_ % sizeof(uint64_t) == 0) {
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uint64_t *dst = dst_;
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const uint64_t *src = src_;
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for (i = 0; i < len / 8; i++) {
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dst[i] = __builtin_bswap64(src[i]);
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}
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i *= 8;
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}
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else {
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uint8_t *dst = dst_;
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const uint8_t *src = src_;
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for (i = 0; i < len-7; i += 8) {
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dst[i] = src[i + 7];
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dst[i + 1] = src[i + 6];
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dst[i + 2] = src[i + 5];
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dst[i + 3] = src[i + 4];
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dst[i + 4] = src[i + 3];
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dst[i + 5] = src[i + 2];
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dst[i + 6] = src[i + 1];
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dst[i + 7] = src[i];
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}
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}
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/* copy len%8 remaining bytes */
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if (i < len) {
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uint8_t *dst = dst_;
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const uint8_t *src = src_;
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for (size_t j = 0; j < len-i; j++) {
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dst[i + j] = src[i+7 - j];
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}
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}
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}
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/*
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* Decode a big-endian length len vector of (unsigned char) into a length
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* len/8 vector of (uint64_t). Assumes len is a multiple of 8.
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*/
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#define be64dec_vect be64enc_vect
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#endif /* __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__ */
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/**
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* @brief Elementary functions used by SHA512
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* @{
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*/
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#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
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#define Maj(x, y, z) ((x & (y | z)) | (y & z))
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#define SHR(x, n) (x >> n)
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#define ROTR(x, n) ((x >> n) | (x << (64 - n)))
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#define S0(x) (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
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#define S1(x) (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))
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#define s0(x) (ROTR(x, 1) ^ ROTR(x, 8) ^ SHR(x, 7))
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#define s1(x) (ROTR(x, 19) ^ ROTR(x, 61) ^ SHR(x, 6))
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/** @} */
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/** @brief SHA-384, SHA-512, SHA-512/224 and SHA-512/256 Constants */
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static const uint64_t K[80] = {
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0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc,
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0x3956c25bf348b538, 0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118,
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0xd807aa98a3030242, 0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2,
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0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235, 0xc19bf174cf692694,
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0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65,
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0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5,
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0x983e5152ee66dfab, 0xa831c66d2db43210, 0xb00327c898fb213f, 0xbf597fc7beef0ee4,
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0xc6e00bf33da88fc2, 0xd5a79147930aa725, 0x06ca6351e003826f, 0x142929670a0e6e70,
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0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df,
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0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b,
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0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30,
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0xd192e819d6ef5218, 0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8,
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0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8,
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0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3,
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0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec,
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0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b,
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0xca273eceea26619c, 0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178,
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0x06f067aa72176fba, 0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b,
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0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc, 0x431d67c49c100d4c,
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0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817,
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};
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/*
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* SHA512 block compression function. The 512-bit state is transformed via
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* the 1024-bit input block to produce a new state.
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*/
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static void sha512_transform(uint64_t *state, const unsigned char block[128])
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{
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uint64_t W[80];
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uint64_t S[8];
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/* 1. Prepare message schedule W. */
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be64dec_vect(W, block, 128);
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for (int i = 16; i < 80; i++) {
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W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
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}
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/* 2. Initialize working variables. */
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memcpy(S, state, 64);
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/* 3. Mix. */
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for (int i = 0; i < 80; ++i) {
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uint64_t e = S[(84 - i) % 8], f = S[(85 - i) % 8];
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uint64_t g = S[(86 - i) % 8], h = S[(87 - i) % 8];
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uint64_t t0 = h + S1(e) + Ch(e, f, g) + W[i] + K[i];
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uint64_t a = S[(80 - i) % 8], b = S[(81 - i) % 8];
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uint64_t c = S[(82 - i) % 8], d = S[(83 - i) % 8];
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uint64_t t1 = S0(a) + Maj(a, b, c);
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S[(83 - i) % 8] = d + t0;
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S[(87 - i) % 8] = t0 + t1;
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}
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/* 4. Mix local working variables into global state */
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for (int i = 0; i < 8; i++) {
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state[i] += S[i];
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}
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}
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static const unsigned char PAD[128] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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};
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/* Add padding and terminating bit-count. */
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void sha512_common_pad(sha512_common_context_t *ctx)
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{
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assert(ctx != NULL);
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/*
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* Convert length to a vector of bytes -- we do this now rather
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* than later because the length will change after we pad.
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*/
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unsigned char len[16];
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be64enc_vect(len, ctx->count, 16);
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/* Add 1--128 bytes so that the resulting length is 112 mod 128 */
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uint8_t r = (ctx->count[1] >> 3) & 0x7f;
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uint8_t plen = (r < 112) ? (112 - r) : (240 - r);
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sha512_common_update(ctx, PAD, (size_t) plen);
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/* Add the terminating bit-count */
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sha512_common_update(ctx, len, 16);
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}
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/* Add bytes into the hash */
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void sha512_common_update(sha512_common_context_t *ctx, const void *data, size_t len)
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{
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assert(ctx != NULL);
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/* Number of bytes left in the buffer from previous updates */
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uint8_t r = (ctx->count[1] >> 3) & 0x7f;
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/* Number of bytes free in the buffer from previous updates */
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uint8_t f = 128 - r;
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/* Convert the length into a number of bits */
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uint64_t bitlen1 = ((uint64_t) len) << 3;
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uint64_t bitlen0 = ((uint64_t) len) >> 61;
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/* Update number of bits */
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if ((ctx->count[1] += bitlen1) < bitlen1) {
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ctx->count[0]++;
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}
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ctx->count[0] += bitlen0;
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/* Handle the case where we don't need to perform any transforms */
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if (len < f) {
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if (len > 0) {
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memcpy(&ctx->buf[r], data, len);
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}
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return;
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}
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/* Finish the current block */
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const unsigned char *src = data;
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memcpy(&ctx->buf[r], src, f);
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sha512_transform(ctx->state, ctx->buf);
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src += f;
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len -= f;
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/* Perform complete blocks */
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while (len >= 128) {
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sha512_transform(ctx->state, src);
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src += 128;
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len -= 128;
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}
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/* Copy left over data into buffer */
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memcpy(ctx->buf, src, len);
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}
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/*
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* SHA-512 finalization. Pads the input data, exports the hash value,
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* and clears the context state.
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*/
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void sha512_common_final(sha512_common_context_t *ctx, void *dst, size_t dig_len)
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{
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assert(ctx != NULL);
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/* Add padding */
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sha512_common_pad(ctx);
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/* Write the hash */
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be64enc_vect(dst, ctx->state, dig_len);
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/* Clear the context state */
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memset(ctx, 0, sizeof(*ctx));
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}
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