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 }; 181