mirror of
https://github.com/DarkFlippers/unleashed-firmware
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251 lines
8.2 KiB
C
251 lines
8.2 KiB
C
/* sha1.c - Functions to compute SHA1 message digest of files or
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memory blocks according to the NIST specification FIPS-180-1.
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Copyright (C) 2000-2001, 2003-2006, 2008-2022 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Scott G. Miller
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Credits:
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Robert Klep <robert@ilse.nl> -- Expansion function fix
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*/
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/* Specification. */
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#include "sha1.h"
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#include <stdint.h>
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#include <string.h>
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#include "sha_pad_buffer.h"
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#ifdef WORDS_BIGENDIAN
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#define SWAP(n) (n)
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#else
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#include "byteswap.h"
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#define SWAP(n) swap_uint32(n)
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#endif
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/* Take a pointer to a 160 bit block of data (five 32 bit ints) and
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initialize it to the start constants of the SHA1 algorithm. This
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must be called before using hash in the call to sha1_hash. */
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void sha1_init_ctx(struct sha1_ctx* ctx) {
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ctx->A = 0x67452301;
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ctx->B = 0xefcdab89;
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ctx->C = 0x98badcfe;
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ctx->D = 0x10325476;
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ctx->E = 0xc3d2e1f0;
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ctx->total[0] = ctx->total[1] = 0;
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ctx->buflen = 0;
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}
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/* Copy the 4 byte value from v into the memory location pointed to by *cp,
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If your architecture allows unaligned access this is equivalent to
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* (uint32_t *) cp = v */
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static void set_uint32(char* cp, uint32_t v) {
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memcpy(cp, &v, sizeof v);
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}
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/* Put result from CTX in first 20 bytes following RESBUF. The result
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must be in little endian byte order. */
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void* sha1_read_ctx(const struct sha1_ctx* ctx, void* resbuf) {
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char* r = resbuf;
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set_uint32(r + 0 * sizeof ctx->A, SWAP(ctx->A));
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set_uint32(r + 1 * sizeof ctx->B, SWAP(ctx->B));
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set_uint32(r + 2 * sizeof ctx->C, SWAP(ctx->C));
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set_uint32(r + 3 * sizeof ctx->D, SWAP(ctx->D));
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set_uint32(r + 4 * sizeof ctx->E, SWAP(ctx->E));
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return resbuf;
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}
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/* Process the remaining bytes in the internal buffer and the usual
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prolog according to the standard and write the result to RESBUF. */
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void* sha1_finish_ctx(struct sha1_ctx* ctx, void* resbuf) {
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/* Take yet unprocessed bytes into account. */
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uint32_t bytes = ctx->buflen;
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size_t size = (bytes < 56) ? 64 / 4 : 64 * 2 / 4;
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/* Now count remaining bytes. */
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ctx->total[0] += bytes;
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if(ctx->total[0] < bytes) ++ctx->total[1];
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/* Put the 64-bit file length in *bits* at the end of the buffer. */
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ctx->buffer[size - 2] = SWAP((ctx->total[1] << 3) | (ctx->total[0] >> 29));
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ctx->buffer[size - 1] = SWAP(ctx->total[0] << 3);
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sha_pad_buffer(&((uint8_t*)ctx->buffer)[bytes], (size - 2) * 4 - bytes);
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/* Process last bytes. */
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sha1_process_block(ctx->buffer, size * 4, ctx);
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return sha1_read_ctx(ctx, resbuf);
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}
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/* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
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result is always in little endian byte order, so that a byte-wise
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output yields to the wanted ASCII representation of the message
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digest. */
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void* sha1_buffer(const char* buffer, size_t len, void* resblock) {
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struct sha1_ctx ctx;
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/* Initialize the computation context. */
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sha1_init_ctx(&ctx);
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/* Process whole buffer but last len % 64 bytes. */
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sha1_process_bytes(buffer, len, &ctx);
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/* Put result in desired memory area. */
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return sha1_finish_ctx(&ctx, resblock);
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}
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void sha1_process_bytes(const void* buffer, size_t len, struct sha1_ctx* ctx) {
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/* When we already have some bits in our internal buffer concatenate
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both inputs first. */
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if(ctx->buflen != 0) {
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size_t left_over = ctx->buflen;
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size_t add = 128 - left_over > len ? len : 128 - left_over;
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memcpy(&((char*)ctx->buffer)[left_over], buffer, add);
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ctx->buflen += add;
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if(ctx->buflen > 64) {
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sha1_process_block(ctx->buffer, ctx->buflen & ~63, ctx);
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ctx->buflen &= 63;
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/* The regions in the following copy operation cannot overlap,
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because ctx->buflen < 64 ≤ (left_over + add) & ~63. */
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memcpy(ctx->buffer, &((char*)ctx->buffer)[(left_over + add) & ~63], ctx->buflen);
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}
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buffer = (const char*)buffer + add;
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len -= add;
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}
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/* Process available complete blocks. */
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if(len >= 64) {
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#if !(_STRING_ARCH_unaligned || _STRING_INLINE_unaligned)
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#define UNALIGNED_P(p) ((uintptr_t)(p) % sizeof(uint32_t) != 0)
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if(UNALIGNED_P(buffer))
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while(len > 64) {
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sha1_process_block(memcpy(ctx->buffer, buffer, 64), 64, ctx); //-V1086
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buffer = (const char*)buffer + 64;
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len -= 64;
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}
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else
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#endif
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{
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sha1_process_block(buffer, len & ~63, ctx);
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buffer = (const char*)buffer + (len & ~63);
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len &= 63;
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}
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}
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/* Move remaining bytes in internal buffer. */
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if(len > 0) {
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size_t left_over = ctx->buflen;
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memcpy(&((char*)ctx->buffer)[left_over], buffer, len);
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left_over += len;
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if(left_over >= 64) {
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sha1_process_block(ctx->buffer, 64, ctx);
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left_over -= 64;
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/* The regions in the following copy operation cannot overlap,
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because left_over ≤ 64. */
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memcpy(ctx->buffer, &ctx->buffer[16], left_over);
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}
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ctx->buflen = left_over;
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}
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}
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/* --- Code below is the primary difference between md5.c and sha1.c --- */
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/* SHA1 round constants */
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static const int sha1_round_constants[4] = {0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6};
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/* Round functions. Note that F2 is the same as F4. */
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#define F1(B, C, D) (D ^ (B & (C ^ D)))
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#define F2_4(B, C, D) (B ^ C ^ D)
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#define F3(B, C, D) ((B & C) | (D & (B | C)))
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#define FN(I, B, C, D) (I == 0 ? F1(B, C, D) : (I == 2 ? F3(B, C, D) : F2_4(B, C, D)))
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/* Process LEN bytes of BUFFER, accumulating context into CTX.
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It is assumed that LEN % 64 == 0.
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Most of this code comes from GnuPG's cipher/sha1.c. */
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void sha1_process_block(const void* buffer, size_t len, struct sha1_ctx* ctx) {
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const uint32_t* words = buffer;
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size_t nwords = len / sizeof(uint32_t);
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const uint32_t* endp = words + nwords;
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uint32_t x[16];
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uint32_t a = ctx->A;
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uint32_t b = ctx->B;
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uint32_t c = ctx->C;
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uint32_t d = ctx->D;
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uint32_t e = ctx->E;
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uint32_t lolen = len;
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/* First increment the byte count. RFC 1321 specifies the possible
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length of the file up to 2^64 bits. Here we only compute the
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number of bytes. Do a double word increment. */
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ctx->total[0] += lolen;
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ctx->total[1] += (len >> 31 >> 1) + (ctx->total[0] < lolen);
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#define rol(x, n) (((x) << (n)) | ((uint32_t)(x) >> (32 - (n))))
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#define M(I) \
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(tm = x[I & 0x0f] ^ x[(I - 14) & 0x0f] ^ x[(I - 8) & 0x0f] ^ x[(I - 3) & 0x0f], \
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(x[I & 0x0f] = rol(tm, 1)))
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#define R(A, B, C, D, E, F, K, M, KI) \
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do { \
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E += rol(A, 5) + F(KI, B, C, D) + K + M; \
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B = rol(B, 30); \
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} while(0)
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while(words < endp) {
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uint32_t tm;
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int t;
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for(t = 0; t < 16; t++) {
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x[t] = SWAP(*words);
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words++;
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}
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for(uint8_t i = 0; i < 80; i++) {
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uint32_t m = i < 16 ? x[i] : M(i);
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uint8_t ki = i / 20;
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int k_const = sha1_round_constants[ki];
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R(a, b, c, d, e, FN, k_const, m, ki);
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uint32_t tt = a;
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a = e;
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e = d;
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d = c;
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c = b;
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b = tt;
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}
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a = ctx->A += a;
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b = ctx->B += b;
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c = ctx->C += c;
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d = ctx->D += d;
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e = ctx->E += e;
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}
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}
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/*
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* Hey Emacs!
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* Local Variables:
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* coding: utf-8
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* End:
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*/
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