cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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hash.c (4381B)

      1/*
      2 * QEMU Crypto hash algorithms
      3 *
      4 * Copyright (c) 2015 Red Hat, Inc.
      5 *
      6 * This library is free software; you can redistribute it and/or
      7 * modify it under the terms of the GNU Lesser General Public
      8 * License as published by the Free Software Foundation; either
      9 * version 2.1 of the License, or (at your option) any later version.
     10 *
     11 * This library is distributed in the hope that it will be useful,
     12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14 * Lesser General Public License for more details.
     15 *
     16 * You should have received a copy of the GNU Lesser General Public
     17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
     18 *
     19 */
     20
     21#include "qemu/osdep.h"
     22#include "crypto/hash.h"
     23#include "hashpriv.h"
     24
     25static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = {
     26    [QCRYPTO_HASH_ALG_MD5] = 16,
     27    [QCRYPTO_HASH_ALG_SHA1] = 20,
     28    [QCRYPTO_HASH_ALG_SHA224] = 28,
     29    [QCRYPTO_HASH_ALG_SHA256] = 32,
     30    [QCRYPTO_HASH_ALG_SHA384] = 48,
     31    [QCRYPTO_HASH_ALG_SHA512] = 64,
     32    [QCRYPTO_HASH_ALG_RIPEMD160] = 20,
     33};
     34
     35size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)
     36{
     37    assert(alg < G_N_ELEMENTS(qcrypto_hash_alg_size));
     38    return qcrypto_hash_alg_size[alg];
     39}
     40
     41int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
     42                        const struct iovec *iov,
     43                        size_t niov,
     44                        uint8_t **result,
     45                        size_t *resultlen,
     46                        Error **errp)
     47{
     48#ifdef CONFIG_AF_ALG
     49    int ret;
     50    /*
     51     * TODO:
     52     * Maybe we should treat some afalg errors as fatal
     53     */
     54    ret = qcrypto_hash_afalg_driver.hash_bytesv(alg, iov, niov,
     55                                                result, resultlen,
     56                                                NULL);
     57    if (ret == 0) {
     58        return ret;
     59    }
     60#endif
     61
     62    return qcrypto_hash_lib_driver.hash_bytesv(alg, iov, niov,
     63                                               result, resultlen,
     64                                               errp);
     65}
     66
     67
     68int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
     69                       const char *buf,
     70                       size_t len,
     71                       uint8_t **result,
     72                       size_t *resultlen,
     73                       Error **errp)
     74{
     75    struct iovec iov = { .iov_base = (char *)buf,
     76                         .iov_len = len };
     77    return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp);
     78}
     79
     80static const char hex[] = "0123456789abcdef";
     81
     82int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
     83                         const struct iovec *iov,
     84                         size_t niov,
     85                         char **digest,
     86                         Error **errp)
     87{
     88    uint8_t *result = NULL;
     89    size_t resultlen = 0;
     90    size_t i;
     91
     92    if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
     93        return -1;
     94    }
     95
     96    *digest = g_new0(char, (resultlen * 2) + 1);
     97    for (i = 0 ; i < resultlen ; i++) {
     98        (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf];
     99        (*digest)[(i * 2) + 1] = hex[result[i] & 0xf];
    100    }
    101    (*digest)[resultlen * 2] = '\0';
    102    g_free(result);
    103    return 0;
    104}
    105
    106int qcrypto_hash_digest(QCryptoHashAlgorithm alg,
    107                        const char *buf,
    108                        size_t len,
    109                        char **digest,
    110                        Error **errp)
    111{
    112    struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
    113
    114    return qcrypto_hash_digestv(alg, &iov, 1, digest, errp);
    115}
    116
    117int qcrypto_hash_base64v(QCryptoHashAlgorithm alg,
    118                         const struct iovec *iov,
    119                         size_t niov,
    120                         char **base64,
    121                         Error **errp)
    122{
    123    uint8_t *result = NULL;
    124    size_t resultlen = 0;
    125
    126    if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
    127        return -1;
    128    }
    129
    130    *base64 = g_base64_encode(result, resultlen);
    131    g_free(result);
    132    return 0;
    133}
    134
    135int qcrypto_hash_base64(QCryptoHashAlgorithm alg,
    136                        const char *buf,
    137                        size_t len,
    138                        char **base64,
    139                        Error **errp)
    140{
    141    struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
    142
    143    return qcrypto_hash_base64v(alg, &iov, 1, base64, errp);
    144}