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 #if CONFIG_NETTLE_VERSION_MAJOR < 3
  22 typedef unsigned int hmac_length_t;
  23 #else
  24 typedef size_t hmac_length_t;
  25 #endif
  26
  27 typedef void (*qcrypto_nettle_hmac_setkey)(void *ctx,
  28                                            hmac_length_t key_length,
  29                                            const uint8_t *key);
  30
  31 typedef void (*qcrypto_nettle_hmac_update)(void *ctx,
  32                                            hmac_length_t length,
  33                                            const uint8_t *data);
  34
  35 typedef void (*qcrypto_nettle_hmac_digest)(void *ctx,
  36                                            hmac_length_t length,
  37                                            uint8_t *digest);
  38
  39 typedef struct QCryptoHmacNettle QCryptoHmacNettle;
  40 struct QCryptoHmacNettle {
  41     union qcrypto_nettle_hmac_ctx {
  42         struct hmac_md5_ctx md5_ctx;
  43         struct hmac_sha1_ctx sha1_ctx;
  44         struct hmac_sha256_ctx sha256_ctx; /* equals hmac_sha224_ctx */
  45         struct hmac_sha512_ctx sha512_ctx; /* equals hmac_sha384_ctx */
  46         struct hmac_ripemd160_ctx ripemd160_ctx;
  47     } u;
  48 };
  49
  50 struct qcrypto_nettle_hmac_alg {
  51     qcrypto_nettle_hmac_setkey setkey;
  52     qcrypto_nettle_hmac_update update;
  53     qcrypto_nettle_hmac_digest digest;
  54     size_t len;
  55 } qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
  56     [QCRYPTO_HASH_ALG_MD5] = {
  57         .setkey = (qcrypto_nettle_hmac_setkey)hmac_md5_set_key,
  58         .update = (qcrypto_nettle_hmac_update)hmac_md5_update,
  59         .digest = (qcrypto_nettle_hmac_digest)hmac_md5_digest,
  60         .len = MD5_DIGEST_SIZE,
  61     },
  62     [QCRYPTO_HASH_ALG_SHA1] = {
  63         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha1_set_key,
  64         .update = (qcrypto_nettle_hmac_update)hmac_sha1_update,
  65         .digest = (qcrypto_nettle_hmac_digest)hmac_sha1_digest,
  66         .len = SHA1_DIGEST_SIZE,
  67     },
  68     [QCRYPTO_HASH_ALG_SHA224] = {
  69         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha224_set_key,
  70         .update = (qcrypto_nettle_hmac_update)hmac_sha224_update,
  71         .digest = (qcrypto_nettle_hmac_digest)hmac_sha224_digest,
  72         .len = SHA224_DIGEST_SIZE,
  73     },
  74     [QCRYPTO_HASH_ALG_SHA256] = {
  75         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha256_set_key,
  76         .update = (qcrypto_nettle_hmac_update)hmac_sha256_update,
  77         .digest = (qcrypto_nettle_hmac_digest)hmac_sha256_digest,
  78         .len = SHA256_DIGEST_SIZE,
  79     },
  80     [QCRYPTO_HASH_ALG_SHA384] = {
  81         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha384_set_key,
  82         .update = (qcrypto_nettle_hmac_update)hmac_sha384_update,
  83         .digest = (qcrypto_nettle_hmac_digest)hmac_sha384_digest,
  84         .len = SHA384_DIGEST_SIZE,
  85     },
  86     [QCRYPTO_HASH_ALG_SHA512] = {
  87         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha512_set_key,
  88         .update = (qcrypto_nettle_hmac_update)hmac_sha512_update,
  89         .digest = (qcrypto_nettle_hmac_digest)hmac_sha512_digest,
  90         .len = SHA512_DIGEST_SIZE,
  91     },
  92     [QCRYPTO_HASH_ALG_RIPEMD160] = {
  93         .setkey = (qcrypto_nettle_hmac_setkey)hmac_ripemd160_set_key,
  94         .update = (qcrypto_nettle_hmac_update)hmac_ripemd160_update,
  95         .digest = (qcrypto_nettle_hmac_digest)hmac_ripemd160_digest,
  96         .len = RIPEMD160_DIGEST_SIZE,
  97     },
  98 };
  99
 100 bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
 101 {
 102     if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
 103         qcrypto_hmac_alg_map[alg].setkey != NULL) {
 104         return true;
 105     }
 106
 107     return false;
 108 }
 109
 110 void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,
 111                            const uint8_t *key, size_t nkey,
 112                            Error **errp)
 113 {
 114     QCryptoHmacNettle *ctx;
 115
 116     if (!qcrypto_hmac_supports(alg)) {
 117         error_setg(errp, "Unsupported hmac algorithm %s",
 118                    QCryptoHashAlgorithm_str(alg));
 119         return NULL;
 120     }
 121
 122     ctx = g_new0(QCryptoHmacNettle, 1);
 123
 124     qcrypto_hmac_alg_map[alg].setkey(&ctx->u, nkey, key);
 125
 126     return ctx;
 127 }
 128
 129 static void
 130 qcrypto_nettle_hmac_ctx_free(QCryptoHmac *hmac)
 131 {
 132     QCryptoHmacNettle *ctx;
 133
 134     ctx = hmac->opaque;
 135     g_free(ctx);
 136 }
 137
 138 static int
 139 qcrypto_nettle_hmac_bytesv(QCryptoHmac *hmac,
 140                            const struct iovec *iov,
 141                            size_t niov,
 142                            uint8_t **result,
 143                            size_t *resultlen,
 144                            Error **errp)
 145 {
 146     QCryptoHmacNettle *ctx;
 147     size_t i;
 148
 149     ctx = (QCryptoHmacNettle *)hmac->opaque;
 150
 151     for (i = 0; i < niov; ++i) {
 152         size_t len = iov[i].iov_len;
 153         uint8_t *base = iov[i].iov_base;
 154         while (len) {
 155             size_t shortlen = MIN(len, UINT_MAX);
 156             qcrypto_hmac_alg_map[hmac->alg].update(&ctx->u, len, base);
 157             len -= shortlen;
 158             base += len;
 159         }
 160     }
 161
 162     if (*resultlen == 0) {
 163         *resultlen = qcrypto_hmac_alg_map[hmac->alg].len;
 164         *result = g_new0(uint8_t, *resultlen);
 165     } else if (*resultlen != qcrypto_hmac_alg_map[hmac->alg].len) {
 166         error_setg(errp,
 167                    "Result buffer size %zu is smaller than hash %zu",
 168                    *resultlen, qcrypto_hmac_alg_map[hmac->alg].len);
 169         return -1;
 170     }
 171
 172     qcrypto_hmac_alg_map[hmac->alg].digest(&ctx->u, *resultlen, *result);
 173
 174     return 0;
 175 }
 176
 177 QCryptoHmacDriver qcrypto_hmac_lib_driver = {
 178     .hmac_bytesv = qcrypto_nettle_hmac_bytesv,
 179     .hmac_free = qcrypto_nettle_hmac_ctx_free,
 180 };