crypto/hash-afalg.c

   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
  23 static char *
  24 qcrypto_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
  68 static QCryptoAFAlg *
  69 qcrypto_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
 102 static QCryptoAFAlg *
 103 qcrypto_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
 109 QCryptoAFAlg *
 110 qcrypto_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
 117 static int
 118 qcrypto_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
 169 out:
 170     if (!is_hmac) {
 171         qcrypto_afalg_comm_free(afalg);
 172     }
 173     return ret;
 174 }
 175
 176 static int
 177 qcrypto_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
 187 static int
 188 qcrypto_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
 199 static 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
 207 QCryptoHashDriver qcrypto_hash_afalg_driver = {
 208     .hash_bytesv = qcrypto_afalg_hash_bytesv,
 209 };
 210
 211 QCryptoHmacDriver qcrypto_hmac_afalg_driver = {
 212     .hmac_bytesv = qcrypto_afalg_hmac_bytesv,
 213     .hmac_free = qcrypto_afalg_hmac_ctx_free,
 214 };