qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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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 
     25 static 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 
     35 size_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 
     41 int 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 
     68 int 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 
     80 static const char hex[] = "0123456789abcdef";
     81 
     82 int 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 
    106 int 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 
    117 int 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 
    135 int 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 }