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_lookup[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 }; 172