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_ALGO__MAX] = { 50 [QCRYPTO_HASH_ALGO_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_ALGO_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_ALGO_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_ALGO_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_ALGO_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_ALGO_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_ALGO_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(QCryptoHashAlgo 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(QCryptoHashAlgo 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 QCryptoHashAlgo_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 }; 175