diff options
Diffstat (limited to 'libotr/libgcrypt-1.8.7/cipher/hash-common.c')
| -rw-r--r-- | libotr/libgcrypt-1.8.7/cipher/hash-common.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/libotr/libgcrypt-1.8.7/cipher/hash-common.c b/libotr/libgcrypt-1.8.7/cipher/hash-common.c new file mode 100644 index 0000000..a750d64 --- /dev/null +++ b/libotr/libgcrypt-1.8.7/cipher/hash-common.c @@ -0,0 +1,167 @@ +/* hash-common.c - Common code for hash algorithms + * Copyright (C) 2008 Free Software Foundation, Inc. + * + * This file is part of Libgcrypt. + * + * Libgcrypt is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as + * published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * Libgcrypt is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#ifdef HAVE_STDINT_H +# include <stdint.h> +#endif + +#include "g10lib.h" +#include "hash-common.h" + + +/* Run a selftest for hash algorithm ALGO. If the resulting digest + matches EXPECT/EXPECTLEN and everything else is fine as well, + return NULL. If an error occurs, return a static text string + describing the error. + + DATAMODE controls what will be hashed according to this table: + + 0 - Hash the supplied DATA of DATALEN. + 1 - Hash one million times a 'a'. DATA and DATALEN are ignored. + +*/ +const char * +_gcry_hash_selftest_check_one (int algo, + int datamode, const void *data, size_t datalen, + const void *expect, size_t expectlen) +{ + const char *result = NULL; + gcry_error_t err = 0; + gcry_md_hd_t hd; + unsigned char *digest; + char aaa[1000]; + int xof = 0; + + if (_gcry_md_get_algo_dlen (algo) == 0) + xof = 1; + else if (_gcry_md_get_algo_dlen (algo) != expectlen) + return "digest size does not match expected size"; + + err = _gcry_md_open (&hd, algo, 0); + if (err) + return "gcry_md_open failed"; + + switch (datamode) + { + case 0: + _gcry_md_write (hd, data, datalen); + break; + + case 1: /* Hash one million times an "a". */ + { + int i; + + /* Write in odd size chunks so that we test the buffering. */ + memset (aaa, 'a', 1000); + for (i = 0; i < 1000; i++) + _gcry_md_write (hd, aaa, 1000); + } + break; + + default: + result = "invalid DATAMODE"; + } + + if (!result) + { + if (!xof) + { + digest = _gcry_md_read (hd, algo); + + if ( memcmp (digest, expect, expectlen) ) + result = "digest mismatch"; + } + else + { + gcry_assert(expectlen <= sizeof(aaa)); + + err = _gcry_md_extract (hd, algo, aaa, expectlen); + if (err) + result = "error extracting output from XOF"; + else if ( memcmp (aaa, expect, expectlen) ) + result = "digest mismatch"; + } + } + + _gcry_md_close (hd); + + return result; +} + + +/* Common function to write a chunk of data to the transform function + of a hash algorithm. Note that the use of the term "block" does + not imply a fixed size block. Note that we explicitly allow to use + this function after the context has been finalized; the result does + not have any meaning but writing after finalize is sometimes + helpful to mitigate timing attacks. */ +void +_gcry_md_block_write (void *context, const void *inbuf_arg, size_t inlen) +{ + const unsigned char *inbuf = inbuf_arg; + gcry_md_block_ctx_t *hd = context; + unsigned int stack_burn = 0; + const unsigned int blocksize = hd->blocksize; + size_t inblocks; + + if (sizeof(hd->buf) < blocksize) + BUG(); + + if (!hd->bwrite) + return; + + if (hd->count == blocksize) /* Flush the buffer. */ + { + stack_burn = hd->bwrite (hd, hd->buf, 1); + _gcry_burn_stack (stack_burn); + stack_burn = 0; + hd->count = 0; + if (!++hd->nblocks) + hd->nblocks_high++; + } + if (!inbuf) + return; + + if (hd->count) + { + for (; inlen && hd->count < blocksize; inlen--) + hd->buf[hd->count++] = *inbuf++; + _gcry_md_block_write (hd, NULL, 0); + if (!inlen) + return; + } + + if (inlen >= blocksize) + { + inblocks = inlen / blocksize; + stack_burn = hd->bwrite (hd, inbuf, inblocks); + hd->count = 0; + hd->nblocks_high += (hd->nblocks + inblocks < inblocks); + hd->nblocks += inblocks; + inlen -= inblocks * blocksize; + inbuf += inblocks * blocksize; + } + _gcry_burn_stack (stack_burn); + for (; inlen && hd->count < blocksize; inlen--) + hd->buf[hd->count++] = *inbuf++; +} |