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