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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
238 lines
8.0 KiB
C
238 lines
8.0 KiB
C
/* Functions to compute SHA512 message digest of files or memory blocks.
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according to the definition of SHA512 in FIPS 180-2.
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Copyright (C) 2007-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <endian.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include "sha512.h"
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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# ifdef _LIBC
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# include <byteswap.h>
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# define SWAP(n) bswap_64 (n)
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# else
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# define SWAP(n) \
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(((n) << 56) \
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| (((n) & 0xff00) << 40) \
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| (((n) & 0xff0000) << 24) \
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| (((n) & 0xff000000) << 8) \
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| (((n) >> 8) & 0xff000000) \
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| (((n) >> 24) & 0xff0000) \
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| (((n) >> 40) & 0xff00) \
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| ((n) >> 56))
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# endif
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#else
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# define SWAP(n) (n)
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#endif
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/* This array contains the bytes used to pad the buffer to the next
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64-byte boundary. (FIPS 180-2:5.1.2) */
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static const unsigned char fillbuf[128] = { 0x80, 0 /* , 0, 0, ... */ };
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/* Constants for SHA512 from FIPS 180-2:4.2.3. */
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static const uint64_t K[80] =
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{
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UINT64_C (0x428a2f98d728ae22), UINT64_C (0x7137449123ef65cd),
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UINT64_C (0xb5c0fbcfec4d3b2f), UINT64_C (0xe9b5dba58189dbbc),
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UINT64_C (0x3956c25bf348b538), UINT64_C (0x59f111f1b605d019),
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UINT64_C (0x923f82a4af194f9b), UINT64_C (0xab1c5ed5da6d8118),
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UINT64_C (0xd807aa98a3030242), UINT64_C (0x12835b0145706fbe),
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UINT64_C (0x243185be4ee4b28c), UINT64_C (0x550c7dc3d5ffb4e2),
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UINT64_C (0x72be5d74f27b896f), UINT64_C (0x80deb1fe3b1696b1),
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UINT64_C (0x9bdc06a725c71235), UINT64_C (0xc19bf174cf692694),
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UINT64_C (0xe49b69c19ef14ad2), UINT64_C (0xefbe4786384f25e3),
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UINT64_C (0x0fc19dc68b8cd5b5), UINT64_C (0x240ca1cc77ac9c65),
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UINT64_C (0x2de92c6f592b0275), UINT64_C (0x4a7484aa6ea6e483),
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UINT64_C (0x5cb0a9dcbd41fbd4), UINT64_C (0x76f988da831153b5),
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UINT64_C (0x983e5152ee66dfab), UINT64_C (0xa831c66d2db43210),
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UINT64_C (0xb00327c898fb213f), UINT64_C (0xbf597fc7beef0ee4),
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UINT64_C (0xc6e00bf33da88fc2), UINT64_C (0xd5a79147930aa725),
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UINT64_C (0x06ca6351e003826f), UINT64_C (0x142929670a0e6e70),
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UINT64_C (0x27b70a8546d22ffc), UINT64_C (0x2e1b21385c26c926),
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UINT64_C (0x4d2c6dfc5ac42aed), UINT64_C (0x53380d139d95b3df),
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UINT64_C (0x650a73548baf63de), UINT64_C (0x766a0abb3c77b2a8),
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UINT64_C (0x81c2c92e47edaee6), UINT64_C (0x92722c851482353b),
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UINT64_C (0xa2bfe8a14cf10364), UINT64_C (0xa81a664bbc423001),
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UINT64_C (0xc24b8b70d0f89791), UINT64_C (0xc76c51a30654be30),
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UINT64_C (0xd192e819d6ef5218), UINT64_C (0xd69906245565a910),
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UINT64_C (0xf40e35855771202a), UINT64_C (0x106aa07032bbd1b8),
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UINT64_C (0x19a4c116b8d2d0c8), UINT64_C (0x1e376c085141ab53),
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UINT64_C (0x2748774cdf8eeb99), UINT64_C (0x34b0bcb5e19b48a8),
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UINT64_C (0x391c0cb3c5c95a63), UINT64_C (0x4ed8aa4ae3418acb),
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UINT64_C (0x5b9cca4f7763e373), UINT64_C (0x682e6ff3d6b2b8a3),
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UINT64_C (0x748f82ee5defb2fc), UINT64_C (0x78a5636f43172f60),
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UINT64_C (0x84c87814a1f0ab72), UINT64_C (0x8cc702081a6439ec),
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UINT64_C (0x90befffa23631e28), UINT64_C (0xa4506cebde82bde9),
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UINT64_C (0xbef9a3f7b2c67915), UINT64_C (0xc67178f2e372532b),
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UINT64_C (0xca273eceea26619c), UINT64_C (0xd186b8c721c0c207),
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UINT64_C (0xeada7dd6cde0eb1e), UINT64_C (0xf57d4f7fee6ed178),
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UINT64_C (0x06f067aa72176fba), UINT64_C (0x0a637dc5a2c898a6),
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UINT64_C (0x113f9804bef90dae), UINT64_C (0x1b710b35131c471b),
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UINT64_C (0x28db77f523047d84), UINT64_C (0x32caab7b40c72493),
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UINT64_C (0x3c9ebe0a15c9bebc), UINT64_C (0x431d67c49c100d4c),
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UINT64_C (0x4cc5d4becb3e42b6), UINT64_C (0x597f299cfc657e2a),
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UINT64_C (0x5fcb6fab3ad6faec), UINT64_C (0x6c44198c4a475817)
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};
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void __sha512_process_block (const void *buffer, size_t len,
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struct sha512_ctx *ctx);
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/* Initialize structure containing state of computation.
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(FIPS 180-2:5.3.3) */
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void
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__sha512_init_ctx (struct sha512_ctx *ctx)
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{
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ctx->H[0] = UINT64_C (0x6a09e667f3bcc908);
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ctx->H[1] = UINT64_C (0xbb67ae8584caa73b);
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ctx->H[2] = UINT64_C (0x3c6ef372fe94f82b);
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ctx->H[3] = UINT64_C (0xa54ff53a5f1d36f1);
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ctx->H[4] = UINT64_C (0x510e527fade682d1);
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ctx->H[5] = UINT64_C (0x9b05688c2b3e6c1f);
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ctx->H[6] = UINT64_C (0x1f83d9abfb41bd6b);
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ctx->H[7] = UINT64_C (0x5be0cd19137e2179);
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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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/* 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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IMPORTANT: On some systems it is required that RESBUF is correctly
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aligned for a 32 bits value. */
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void *
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__sha512_finish_ctx (struct sha512_ctx *ctx, void *resbuf)
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{
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/* Take yet unprocessed bytes into account. */
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uint64_t bytes = ctx->buflen;
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size_t pad;
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/* Now count remaining bytes. */
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#ifdef USE_TOTAL128
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ctx->total128 += bytes;
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#else
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ctx->total[TOTAL128_low] += bytes;
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if (ctx->total[TOTAL128_low] < bytes)
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++ctx->total[TOTAL128_high];
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#endif
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pad = bytes >= 112 ? 128 + 112 - bytes : 112 - bytes;
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memcpy (&ctx->buffer[bytes], fillbuf, pad);
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/* Put the 128-bit file length in *bits* at the end of the buffer. */
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ctx->buffer64[(bytes + pad + 8) / 8] = SWAP (ctx->total[TOTAL128_low] << 3);
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ctx->buffer64[(bytes + pad) / 8] = SWAP ((ctx->total[TOTAL128_high] << 3)
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| (ctx->total[TOTAL128_low] >> 61));
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/* Process last bytes. */
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__sha512_process_block (ctx->buffer, bytes + pad + 16, ctx);
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/* Put result from CTX in first 64 bytes following RESBUF. */
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for (unsigned int i = 0; i < 8; ++i)
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((uint64_t *) resbuf)[i] = SWAP (ctx->H[i]);
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return resbuf;
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}
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void
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__sha512_process_bytes (const void *buffer, size_t len, struct sha512_ctx *ctx)
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{
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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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{
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size_t left_over = ctx->buflen;
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size_t add = 256 - left_over > len ? len : 256 - left_over;
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memcpy (&ctx->buffer[left_over], buffer, add);
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ctx->buflen += add;
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if (ctx->buflen > 128)
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{
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__sha512_process_block (ctx->buffer, ctx->buflen & ~127, ctx);
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ctx->buflen &= 127;
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/* The regions in the following copy operation cannot overlap. */
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memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~127],
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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 >= 128)
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{
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#if !_STRING_ARCH_unaligned
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/* To check alignment gcc has an appropriate operator. Other
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compilers don't. */
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# if __GNUC__ >= 2
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# define UNALIGNED_P(p) (((uintptr_t) p) % __alignof__ (uint64_t) != 0)
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# else
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# define UNALIGNED_P(p) (((uintptr_t) p) % sizeof (uint64_t) != 0)
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# endif
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if (UNALIGNED_P (buffer))
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while (len > 128)
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{
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__sha512_process_block (memcpy (ctx->buffer, buffer, 128), 128,
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ctx);
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buffer = (const char *) buffer + 128;
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len -= 128;
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}
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else
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#endif
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{
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__sha512_process_block (buffer, len & ~127, ctx);
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buffer = (const char *) buffer + (len & ~127);
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len &= 127;
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}
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}
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/* Move remaining bytes into internal buffer. */
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if (len > 0)
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{
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size_t left_over = ctx->buflen;
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memcpy (&ctx->buffer[left_over], buffer, len);
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left_over += len;
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if (left_over >= 128)
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{
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__sha512_process_block (ctx->buffer, 128, ctx);
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left_over -= 128;
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memcpy (ctx->buffer, &ctx->buffer[128], 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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#include <sha512-block.c>
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