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 <nettle/hmac.h>
  19
  20 typedef void (*qcrypto_nettle_hmac_setkey)(void *ctx,
  21               size_t key_length, const uint8_t *key);
  22
  23 typedef void (*qcrypto_nettle_hmac_update)(void *ctx,
  24               size_t length, const uint8_t *data);
  25
  26 typedef void (*qcrypto_nettle_hmac_digest)(void *ctx,
  27               size_t length, uint8_t *digest);
  28
  29 typedef struct QCryptoHmacNettle QCryptoHmacNettle;
  30 struct QCryptoHmacNettle {
  31     union qcrypto_nettle_hmac_ctx {
  32         struct hmac_md5_ctx md5_ctx;
  33         struct hmac_sha1_ctx sha1_ctx;
  34         struct hmac_sha256_ctx sha256_ctx; /* equals hmac_sha224_ctx */
  35         struct hmac_sha512_ctx sha512_ctx; /* equals hmac_sha384_ctx */
  36         struct hmac_ripemd160_ctx ripemd160_ctx;
  37     } u;
  38 };
  39
  40 struct qcrypto_nettle_hmac_alg {
  41     qcrypto_nettle_hmac_setkey setkey;
  42     qcrypto_nettle_hmac_update update;
  43     qcrypto_nettle_hmac_digest digest;
  44     size_t len;
  45 } qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
  46     [QCRYPTO_HASH_ALG_MD5] = {
  47         .setkey = (qcrypto_nettle_hmac_setkey)hmac_md5_set_key,
  48         .update = (qcrypto_nettle_hmac_update)hmac_md5_update,
  49         .digest = (qcrypto_nettle_hmac_digest)hmac_md5_digest,
  50         .len = MD5_DIGEST_SIZE,
  51     },
  52     [QCRYPTO_HASH_ALG_SHA1] = {
  53         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha1_set_key,
  54         .update = (qcrypto_nettle_hmac_update)hmac_sha1_update,
  55         .digest = (qcrypto_nettle_hmac_digest)hmac_sha1_digest,
  56         .len = SHA1_DIGEST_SIZE,
  57     },
  58     [QCRYPTO_HASH_ALG_SHA224] = {
  59         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha224_set_key,
  60         .update = (qcrypto_nettle_hmac_update)hmac_sha224_update,
  61         .digest = (qcrypto_nettle_hmac_digest)hmac_sha224_digest,
  62         .len = SHA224_DIGEST_SIZE,
  63     },
  64     [QCRYPTO_HASH_ALG_SHA256] = {
  65         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha256_set_key,
  66         .update = (qcrypto_nettle_hmac_update)hmac_sha256_update,
  67         .digest = (qcrypto_nettle_hmac_digest)hmac_sha256_digest,
  68         .len = SHA256_DIGEST_SIZE,
  69     },
  70     [QCRYPTO_HASH_ALG_SHA384] = {
  71         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha384_set_key,
  72         .update = (qcrypto_nettle_hmac_update)hmac_sha384_update,
  73         .digest = (qcrypto_nettle_hmac_digest)hmac_sha384_digest,
  74         .len = SHA384_DIGEST_SIZE,
  75     },
  76     [QCRYPTO_HASH_ALG_SHA512] = {
  77         .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha512_set_key,
  78         .update = (qcrypto_nettle_hmac_update)hmac_sha512_update,
  79         .digest = (qcrypto_nettle_hmac_digest)hmac_sha512_digest,
  80         .len = SHA512_DIGEST_SIZE,
  81     },
  82     [QCRYPTO_HASH_ALG_RIPEMD160] = {
  83         .setkey = (qcrypto_nettle_hmac_setkey)hmac_ripemd160_set_key,
  84         .update = (qcrypto_nettle_hmac_update)hmac_ripemd160_update,
  85         .digest = (qcrypto_nettle_hmac_digest)hmac_ripemd160_digest,
  86         .len = RIPEMD160_DIGEST_SIZE,
  87     },
  88 };
  89
  90 bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
  91 {
  92     if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
  93         qcrypto_hmac_alg_map[alg].setkey != NULL) {
  94         return true;
  95     }
  96
  97     return false;
  98 }
  99
 100 QCryptoHmac *qcrypto_hmac_new(QCryptoHashAlgorithm alg,
 101                               const uint8_t *key, size_t nkey,
 102                               Error **errp)
 103 {
 104     QCryptoHmac *hmac;
 105     QCryptoHmacNettle *ctx;
 106
 107     if (!qcrypto_hmac_supports(alg)) {
 108         error_setg(errp, "Unsupported hmac algorithm %s",
 109                    QCryptoHashAlgorithm_lookup[alg]);
 110         return NULL;
 111     }
 112
 113     hmac = g_new0(QCryptoHmac, 1);
 114     hmac->alg = alg;
 115
 116     ctx = g_new0(QCryptoHmacNettle, 1);
 117
 118     qcrypto_hmac_alg_map[alg].setkey(&ctx->u, nkey, key);
 119
 120     hmac->opaque = ctx;
 121
 122     return hmac;
 123 }
 124
 125 void qcrypto_hmac_free(QCryptoHmac *hmac)
 126 {
 127     QCryptoHmacNettle *ctx;
 128
 129     if (!hmac) {
 130         return;
 131     }
 132
 133     ctx = hmac->opaque;
 134
 135     g_free(ctx);
 136     g_free(hmac);
 137 }
 138
 139 int qcrypto_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     int 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 }