crypto/hmac-nettle.c

   1 /*
   2  * QEMU Crypto hmac algorithms (based on nettle)
   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 #include <nettle/hmac.h>
  20
  21 typedef void (*qcrypto_nettle_hmac_setkey)(void *ctx,
  22                                            size_t key_length,
  23                                            const uint8_t *key);
  24
  25 typedef void (*qcrypto_nettle_hmac_update)(void *ctx,
  26                                            size_t length,
  27                                            const uint8_t *data);
  28
  29 typedef void (*qcrypto_nettle_hmac_digest)(void *ctx,
  30                                            size_t length,
  31                                            uint8_t *digest);
  32
  33 typedef struct QCryptoHmacNettle QCryptoHmacNettle;
  34 struct QCryptoHmacNettle {
  35     union qcrypto_nettle_hmac_ctx {
  36         struct hmac_md5_ctx md5_ctx;
  37         struct hmac_sha1_ctx sha1_ctx;
  38         struct hmac_sha256_ctx sha256_ctx; /* equals hmac_sha224_ctx */
  39         struct hmac_sha512_ctx sha512_ctx; /* equals hmac_sha384_ctx */
  40         struct hmac_ripemd160_ctx ripemd160_ctx;
  41     } u;
  42 };
  43
  44 struct qcrypto_nettle_hmac_alg {
  45     qcrypto_nettle_hmac_setkey setkey;
  46     qcrypto_nettle_hmac_update update;
  47     qcrypto_nettle_hmac_digest digest;
  48     size_t len;
  49 } qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
  50     [QCRYPTO_HASH_ALG_MD5] = {
  51         .setkey = (qcrypto_nettle_hmac_setkey)hmac_md5_set_key,
  52         .update = (qcrypto_nettle_hmac_update)hmac_md5_update,
  53         .digest = (qcrypto_nettle_hmac_digest)hmac_md5_digest,
  54         .len = MD5_DIGEST_SIZE,
  55     },
  56     [QCRYPTO_HASH_ALG_SHA1] = {
  57         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha1_set_key,
  58         .update = (qcrypto_nettle_hmac_update)hmac_sha1_update,
  59         .digest = (qcrypto_nettle_hmac_digest)hmac_sha1_digest,
  60         .len = SHA1_DIGEST_SIZE,
  61     },
  62     [QCRYPTO_HASH_ALG_SHA224] = {
  63         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha224_set_key,
  64         .update = (qcrypto_nettle_hmac_update)hmac_sha224_update,
  65         .digest = (qcrypto_nettle_hmac_digest)hmac_sha224_digest,
  66         .len = SHA224_DIGEST_SIZE,
  67     },
  68     [QCRYPTO_HASH_ALG_SHA256] = {
  69         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha256_set_key,
  70         .update = (qcrypto_nettle_hmac_update)hmac_sha256_update,
  71         .digest = (qcrypto_nettle_hmac_digest)hmac_sha256_digest,
  72         .len = SHA256_DIGEST_SIZE,
  73     },
  74     [QCRYPTO_HASH_ALG_SHA384] = {
  75         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha384_set_key,
  76         .update = (qcrypto_nettle_hmac_update)hmac_sha384_update,
  77         .digest = (qcrypto_nettle_hmac_digest)hmac_sha384_digest,
  78         .len = SHA384_DIGEST_SIZE,
  79     },
  80     [QCRYPTO_HASH_ALG_SHA512] = {
  81         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha512_set_key,
  82         .update = (qcrypto_nettle_hmac_update)hmac_sha512_update,
  83         .digest = (qcrypto_nettle_hmac_digest)hmac_sha512_digest,
  84         .len = SHA512_DIGEST_SIZE,
  85     },
  86     [QCRYPTO_HASH_ALG_RIPEMD160] = {
  87         .setkey = (qcrypto_nettle_hmac_setkey)hmac_ripemd160_set_key,
  88         .update = (qcrypto_nettle_hmac_update)hmac_ripemd160_update,
  89         .digest = (qcrypto_nettle_hmac_digest)hmac_ripemd160_digest,
  90         .len = RIPEMD160_DIGEST_SIZE,
  91     },
  92 };
  93
  94 bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
  95 {
  96     if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
  97         qcrypto_hmac_alg_map[alg].setkey != NULL) {
  98         return true;
  99     }
 100
 101     return false;
 102 }
 103
 104 void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,
 105                            const uint8_t *key, size_t nkey,
 106                            Error **errp)
 107 {
 108     QCryptoHmacNettle *ctx;
 109
 110     if (!qcrypto_hmac_supports(alg)) {
 111         error_setg(errp, "Unsupported hmac algorithm %s",
 112                    QCryptoHashAlgorithm_str(alg));
 113         return NULL;
 114     }
 115
 116     ctx = g_new0(QCryptoHmacNettle, 1);
 117
 118     qcrypto_hmac_alg_map[alg].setkey(&ctx->u, nkey, key);
 119
 120     return ctx;
 121 }
 122
 123 static void
 124 qcrypto_nettle_hmac_ctx_free(QCryptoHmac *hmac)
 125 {
 126     QCryptoHmacNettle *ctx;
 127
 128     ctx = hmac->opaque;
 129     g_free(ctx);
 130 }
 131
 132 static int
 133 qcrypto_nettle_hmac_bytesv(QCryptoHmac *hmac,
 134                            const struct iovec *iov,
 135                            size_t niov,
 136                            uint8_t **result,
 137                            size_t *resultlen,
 138                            Error **errp)
 139 {
 140     QCryptoHmacNettle *ctx;
 141     size_t i;
 142
 143     ctx = (QCryptoHmacNettle *)hmac->opaque;
 144
 145     for (i = 0; i < niov; ++i) {
 146         size_t len = iov[i].iov_len;
 147         uint8_t *base = iov[i].iov_base;
 148         while (len) {
 149             size_t shortlen = MIN(len, UINT_MAX);
 150             qcrypto_hmac_alg_map[hmac->alg].update(&ctx->u, len, base);
 151             len -= shortlen;
 152             base += len;
 153         }
 154     }
 155
 156     if (*resultlen == 0) {
 157         *resultlen = qcrypto_hmac_alg_map[hmac->alg].len;
 158         *result = g_new0(uint8_t, *resultlen);
 159     } else if (*resultlen != qcrypto_hmac_alg_map[hmac->alg].len) {
 160         error_setg(errp,
 161                    "Result buffer size %zu is smaller than hash %zu",
 162                    *resultlen, qcrypto_hmac_alg_map[hmac->alg].len);
 163         return -1;
 164     }
 165
 166     qcrypto_hmac_alg_map[hmac->alg].digest(&ctx->u, *resultlen, *result);
 167
 168     return 0;
 169 }
 170
 171 QCryptoHmacDriver qcrypto_hmac_lib_driver = {
 172     .hmac_bytesv = qcrypto_nettle_hmac_bytesv,
 173     .hmac_free = qcrypto_nettle_hmac_ctx_free,
 174 };