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