crypto/hmac.c

   1 /*
   2  * QEMU Crypto hmac algorithms
   3  *
   4  * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or
   7  * (at your option) any later version.  See the COPYING file in the
   8  * top-level directory.
   9  *
  10  */
  11
  12 #include "qemu/osdep.h"
  13 #include "qapi/error.h"
  14 #include "crypto/hmac.h"
  15
  16 static const char hex[] = "0123456789abcdef";
  17
  18 int qcrypto_hmac_bytes(QCryptoHmac *hmac,
  19                        const char *buf,
  20                        size_t len,
  21                        uint8_t **result,
  22                        size_t *resultlen,
  23                        Error **errp)
  24 {
  25     struct iovec iov = {
  26             .iov_base = (char *)buf,
  27             .iov_len = len
  28     };
  29
  30     return qcrypto_hmac_bytesv(hmac, &iov, 1, result, resultlen, errp);
  31 }
  32
  33 int qcrypto_hmac_digestv(QCryptoHmac *hmac,
  34                          const struct iovec *iov,
  35                          size_t niov,
  36                          char **digest,
  37                          Error **errp)
  38 {
  39     uint8_t *result = NULL;
  40     size_t resultlen = 0;
  41     size_t i;
  42
  43     if (qcrypto_hmac_bytesv(hmac, iov, niov, &result, &resultlen, errp) < 0) {
  44         return -1;
  45     }
  46
  47     *digest = g_new0(char, (resultlen * 2) + 1);
  48
  49     for (i = 0 ; i < resultlen ; i++) {
  50         (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf];
  51         (*digest)[(i * 2) + 1] = hex[result[i] & 0xf];
  52     }
  53
  54     (*digest)[resultlen * 2] = '\0';
  55
  56     g_free(result);
  57     return 0;
  58 }
  59
  60 int qcrypto_hmac_digest(QCryptoHmac *hmac,
  61                         const char *buf,
  62                         size_t len,
  63                         char **digest,
  64                         Error **errp)
  65 {
  66     struct iovec iov = {
  67             .iov_base = (char *)buf,
  68             .iov_len = len
  69     };
  70
  71     return qcrypto_hmac_digestv(hmac, &iov, 1, digest, errp);
  72 }