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-afalg.c (5756B)

      1/*
      2 * QEMU Crypto af_alg-backend hash/hmac support
      3 *
      4 * Copyright (c) 2017 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#include "qemu/osdep.h"
     14#include "qemu/iov.h"
     15#include "qemu/sockets.h"
     16#include "qemu-common.h"
     17#include "qapi/error.h"
     18#include "crypto/hash.h"
     19#include "crypto/hmac.h"
     20#include "hashpriv.h"
     21#include "hmacpriv.h"
     22
     23static char *
     24qcrypto_afalg_hash_format_name(QCryptoHashAlgorithm alg,
     25                               bool is_hmac,
     26                               Error **errp)
     27{
     28    char *name;
     29    const char *alg_name;
     30
     31    switch (alg) {
     32    case QCRYPTO_HASH_ALG_MD5:
     33        alg_name = "md5";
     34        break;
     35    case QCRYPTO_HASH_ALG_SHA1:
     36        alg_name = "sha1";
     37        break;
     38    case QCRYPTO_HASH_ALG_SHA224:
     39        alg_name = "sha224";
     40        break;
     41    case QCRYPTO_HASH_ALG_SHA256:
     42        alg_name = "sha256";
     43        break;
     44    case QCRYPTO_HASH_ALG_SHA384:
     45        alg_name = "sha384";
     46        break;
     47    case QCRYPTO_HASH_ALG_SHA512:
     48        alg_name = "sha512";
     49        break;
     50    case QCRYPTO_HASH_ALG_RIPEMD160:
     51        alg_name = "rmd160";
     52        break;
     53
     54    default:
     55        error_setg(errp, "Unsupported hash algorithm %d", alg);
     56        return NULL;
     57    }
     58
     59    if (is_hmac) {
     60        name = g_strdup_printf("hmac(%s)", alg_name);
     61    } else {
     62        name = g_strdup_printf("%s", alg_name);
     63    }
     64
     65    return name;
     66}
     67
     68static QCryptoAFAlg *
     69qcrypto_afalg_hash_hmac_ctx_new(QCryptoHashAlgorithm alg,
     70                                const uint8_t *key, size_t nkey,
     71                                bool is_hmac, Error **errp)
     72{
     73    QCryptoAFAlg *afalg;
     74    char *name;
     75
     76    name = qcrypto_afalg_hash_format_name(alg, is_hmac, errp);
     77    if (!name) {
     78        return NULL;
     79    }
     80
     81    afalg = qcrypto_afalg_comm_alloc(AFALG_TYPE_HASH, name, errp);
     82    if (!afalg) {
     83        g_free(name);
     84        return NULL;
     85    }
     86
     87    g_free(name);
     88
     89    /* HMAC needs setkey */
     90    if (is_hmac) {
     91        if (qemu_setsockopt(afalg->tfmfd, SOL_ALG, ALG_SET_KEY,
     92                            key, nkey) != 0) {
     93            error_setg_errno(errp, errno, "Set hmac key failed");
     94            qcrypto_afalg_comm_free(afalg);
     95            return NULL;
     96        }
     97    }
     98
     99    return afalg;
    100}
    101
    102static QCryptoAFAlg *
    103qcrypto_afalg_hash_ctx_new(QCryptoHashAlgorithm alg,
    104                           Error **errp)
    105{
    106    return qcrypto_afalg_hash_hmac_ctx_new(alg, NULL, 0, false, errp);
    107}
    108
    109QCryptoAFAlg *
    110qcrypto_afalg_hmac_ctx_new(QCryptoHashAlgorithm alg,
    111                           const uint8_t *key, size_t nkey,
    112                           Error **errp)
    113{
    114    return qcrypto_afalg_hash_hmac_ctx_new(alg, key, nkey, true, errp);
    115}
    116
    117static int
    118qcrypto_afalg_hash_hmac_bytesv(QCryptoAFAlg *hmac,
    119                               QCryptoHashAlgorithm alg,
    120                               const struct iovec *iov,
    121                               size_t niov, uint8_t **result,
    122                               size_t *resultlen,
    123                               Error **errp)
    124{
    125    QCryptoAFAlg *afalg;
    126    struct iovec outv;
    127    int ret = 0;
    128    bool is_hmac = (hmac != NULL) ? true : false;
    129    const int expect_len = qcrypto_hash_digest_len(alg);
    130
    131    if (*resultlen == 0) {
    132        *resultlen = expect_len;
    133        *result = g_new0(uint8_t, *resultlen);
    134    } else if (*resultlen != expect_len) {
    135        error_setg(errp,
    136                   "Result buffer size %zu is not match hash %d",
    137                   *resultlen, expect_len);
    138        return -1;
    139    }
    140
    141    if (is_hmac) {
    142        afalg = hmac;
    143    } else {
    144        afalg = qcrypto_afalg_hash_ctx_new(alg, errp);
    145        if (!afalg) {
    146            return -1;
    147        }
    148    }
    149
    150    /* send data to kernel's crypto core */
    151    ret = iov_send_recv(afalg->opfd, iov, niov,
    152                        0, iov_size(iov, niov), true);
    153    if (ret < 0) {
    154        error_setg_errno(errp, errno, "Send data to afalg-core failed");
    155        goto out;
    156    }
    157
    158    /* hash && get result */
    159    outv.iov_base = *result;
    160    outv.iov_len = *resultlen;
    161    ret = iov_send_recv(afalg->opfd, &outv, 1,
    162                        0, iov_size(&outv, 1), false);
    163    if (ret < 0) {
    164        error_setg_errno(errp, errno, "Recv result from afalg-core failed");
    165    } else {
    166        ret = 0;
    167    }
    168
    169out:
    170    if (!is_hmac) {
    171        qcrypto_afalg_comm_free(afalg);
    172    }
    173    return ret;
    174}
    175
    176static int
    177qcrypto_afalg_hash_bytesv(QCryptoHashAlgorithm alg,
    178                          const struct iovec *iov,
    179                          size_t niov, uint8_t **result,
    180                          size_t *resultlen,
    181                          Error **errp)
    182{
    183    return qcrypto_afalg_hash_hmac_bytesv(NULL, alg, iov, niov, result,
    184                                          resultlen, errp);
    185}
    186
    187static int
    188qcrypto_afalg_hmac_bytesv(QCryptoHmac *hmac,
    189                          const struct iovec *iov,
    190                          size_t niov, uint8_t **result,
    191                          size_t *resultlen,
    192                          Error **errp)
    193{
    194    return qcrypto_afalg_hash_hmac_bytesv(hmac->opaque, hmac->alg,
    195                                          iov, niov, result, resultlen,
    196                                          errp);
    197}
    198
    199static void qcrypto_afalg_hmac_ctx_free(QCryptoHmac *hmac)
    200{
    201    QCryptoAFAlg *afalg;
    202
    203    afalg = hmac->opaque;
    204    qcrypto_afalg_comm_free(afalg);
    205}
    206
    207QCryptoHashDriver qcrypto_hash_afalg_driver = {
    208    .hash_bytesv = qcrypto_afalg_hash_bytesv,
    209};
    210
    211QCryptoHmacDriver qcrypto_hmac_afalg_driver = {
    212    .hmac_bytesv = qcrypto_afalg_hmac_bytesv,
    213    .hmac_free = qcrypto_afalg_hmac_ctx_free,
    214};