cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

hmac-glib.c (3046B)

      1/*
      2 * QEMU Crypto hmac algorithms (based on glib)
      3 *
      4 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
      5 *
      6 * Authors:
      7 *    Longpeng(Mike) <longpeng2@huawei.com>
      8 *
      9 * This work is licensed under the terms of the GNU GPL, version 2 or
     10 * (at your option) any later version.  See the COPYING file in the
     11 * top-level directory.
     12 *
     13 */
     14
     15#include "qemu/osdep.h"
     16#include "qapi/error.h"
     17#include "crypto/hmac.h"
     18#include "hmacpriv.h"
     19
     20static int qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
     21    [QCRYPTO_HASH_ALG_MD5] = G_CHECKSUM_MD5,
     22    [QCRYPTO_HASH_ALG_SHA1] = G_CHECKSUM_SHA1,
     23    [QCRYPTO_HASH_ALG_SHA256] = G_CHECKSUM_SHA256,
     24    [QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512,
     25    [QCRYPTO_HASH_ALG_SHA224] = -1,
     26    [QCRYPTO_HASH_ALG_SHA384] = -1,
     27    [QCRYPTO_HASH_ALG_RIPEMD160] = -1,
     28};
     29
     30typedef struct QCryptoHmacGlib QCryptoHmacGlib;
     31struct QCryptoHmacGlib {
     32    GHmac *ghmac;
     33};
     34
     35bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
     36{
     37    if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
     38        qcrypto_hmac_alg_map[alg] != -1) {
     39        return true;
     40    }
     41
     42    return false;
     43}
     44
     45void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,
     46                           const uint8_t *key, size_t nkey,
     47                           Error **errp)
     48{
     49    QCryptoHmacGlib *ctx;
     50
     51    if (!qcrypto_hmac_supports(alg)) {
     52        error_setg(errp, "Unsupported hmac algorithm %s",
     53                   QCryptoHashAlgorithm_str(alg));
     54        return NULL;
     55    }
     56
     57    ctx = g_new0(QCryptoHmacGlib, 1);
     58
     59    ctx->ghmac = g_hmac_new(qcrypto_hmac_alg_map[alg],
     60                            (const uint8_t *)key, nkey);
     61    if (!ctx->ghmac) {
     62        error_setg(errp, "Cannot initialize hmac and set key");
     63        goto error;
     64    }
     65
     66    return ctx;
     67
     68error:
     69    g_free(ctx);
     70    return NULL;
     71}
     72
     73static void
     74qcrypto_glib_hmac_ctx_free(QCryptoHmac *hmac)
     75{
     76    QCryptoHmacGlib *ctx;
     77
     78    ctx = hmac->opaque;
     79    g_hmac_unref(ctx->ghmac);
     80
     81    g_free(ctx);
     82}
     83
     84static int
     85qcrypto_glib_hmac_bytesv(QCryptoHmac *hmac,
     86                         const struct iovec *iov,
     87                         size_t niov,
     88                         uint8_t **result,
     89                         size_t *resultlen,
     90                         Error **errp)
     91{
     92    QCryptoHmacGlib *ctx;
     93    int i, ret;
     94
     95    ctx = hmac->opaque;
     96
     97    for (i = 0; i < niov; i++) {
     98        g_hmac_update(ctx->ghmac, iov[i].iov_base, iov[i].iov_len);
     99    }
    100
    101    ret = g_checksum_type_get_length(qcrypto_hmac_alg_map[hmac->alg]);
    102    if (ret < 0) {
    103        error_setg(errp, "Unable to get hmac length");
    104        return -1;
    105    }
    106
    107    if (*resultlen == 0) {
    108        *resultlen = ret;
    109        *result = g_new0(uint8_t, *resultlen);
    110    } else if (*resultlen != ret) {
    111        error_setg(errp, "Result buffer size %zu is smaller than hmac %d",
    112                   *resultlen, ret);
    113        return -1;
    114    }
    115
    116    g_hmac_get_digest(ctx->ghmac, *result, resultlen);
    117
    118    return 0;
    119}
    120
    121QCryptoHmacDriver qcrypto_hmac_lib_driver = {
    122    .hmac_bytesv = qcrypto_glib_hmac_bytesv,
    123    .hmac_free = qcrypto_glib_hmac_ctx_free,
    124};