337 lines
11 KiB
C
337 lines
11 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 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Written by Ulrich Drepper <drepper@redhat.com>, 2007. */
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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 <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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/* Process LEN bytes of BUFFER, accumulating context into CTX.
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It is assumed that LEN % 128 == 0. */
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static void
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sha512_process_block (const void *buffer, size_t len, struct sha512_ctx *ctx)
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{
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const uint64_t *words = buffer;
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size_t nwords = len / sizeof (uint64_t);
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uint64_t a = ctx->H[0];
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uint64_t b = ctx->H[1];
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uint64_t c = ctx->H[2];
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uint64_t d = ctx->H[3];
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uint64_t e = ctx->H[4];
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uint64_t f = ctx->H[5];
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uint64_t g = ctx->H[6];
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uint64_t h = ctx->H[7];
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/* First increment the byte count. FIPS 180-2 specifies the possible
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length of the file up to 2^128 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] += len;
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if (ctx->total[0] < len)
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++ctx->total[1];
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/* Process all bytes in the buffer with 128 bytes in each round of
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the loop. */
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while (nwords > 0)
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{
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uint64_t W[80];
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uint64_t a_save = a;
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uint64_t b_save = b;
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uint64_t c_save = c;
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uint64_t d_save = d;
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uint64_t e_save = e;
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uint64_t f_save = f;
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uint64_t g_save = g;
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uint64_t h_save = h;
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/* Operators defined in FIPS 180-2:4.1.2. */
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#define Ch(x, y, z) ((x & y) ^ (~x & z))
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#define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
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#define S0(x) (CYCLIC (x, 28) ^ CYCLIC (x, 34) ^ CYCLIC (x, 39))
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#define S1(x) (CYCLIC (x, 14) ^ CYCLIC (x, 18) ^ CYCLIC (x, 41))
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#define R0(x) (CYCLIC (x, 1) ^ CYCLIC (x, 8) ^ (x >> 7))
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#define R1(x) (CYCLIC (x, 19) ^ CYCLIC (x, 61) ^ (x >> 6))
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/* It is unfortunate that C does not provide an operator for
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cyclic rotation. Hope the C compiler is smart enough. */
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#define CYCLIC(w, s) ((w >> s) | (w << (64 - s)))
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/* Compute the message schedule according to FIPS 180-2:6.3.2 step 2. */
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for (unsigned int t = 0; t < 16; ++t)
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{
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W[t] = SWAP (*words);
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++words;
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}
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for (unsigned int t = 16; t < 80; ++t)
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W[t] = R1 (W[t - 2]) + W[t - 7] + R0 (W[t - 15]) + W[t - 16];
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/* The actual computation according to FIPS 180-2:6.3.2 step 3. */
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for (unsigned int t = 0; t < 80; ++t)
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{
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uint64_t T1 = h + S1 (e) + Ch (e, f, g) + K[t] + W[t];
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uint64_t T2 = S0 (a) + Maj (a, b, c);
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h = g;
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g = f;
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f = e;
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e = d + T1;
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d = c;
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c = b;
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b = a;
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a = T1 + T2;
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}
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/* Add the starting values of the context according to FIPS 180-2:6.3.2
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step 4. */
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a += a_save;
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b += b_save;
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c += c_save;
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d += d_save;
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e += e_save;
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f += f_save;
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g += g_save;
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h += h_save;
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/* Prepare for the next round. */
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nwords -= 16;
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}
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/* Put checksum in context given as argument. */
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ctx->H[0] = a;
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ctx->H[1] = b;
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ctx->H[2] = c;
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ctx->H[3] = d;
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ctx->H[4] = e;
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ctx->H[5] = f;
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ctx->H[6] = g;
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ctx->H[7] = h;
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}
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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 (ctx)
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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 (ctx, resbuf)
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struct sha512_ctx *ctx;
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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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ctx->total[0] += bytes;
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if (ctx->total[0] < bytes)
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++ctx->total[1];
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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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*(uint64_t *) &ctx->buffer[bytes + pad + 8] = SWAP (ctx->total[0] << 3);
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*(uint64_t *) &ctx->buffer[bytes + pad] = SWAP ((ctx->total[1] << 3) |
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(ctx->total[0] >> 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 (buffer, len, ctx)
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const void *buffer;
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size_t len;
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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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