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_ALG__MAX] = {
50 [QCRYPTO_HASH_ALG_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_ALG_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_ALG_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_ALG_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_ALG_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_ALG_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_ALG_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
qcrypto_hmac_supports(QCryptoHashAlgorithm alg)94 bool qcrypto_hmac_supports(QCryptoHashAlgorithm 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
qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,const uint8_t * key,size_t nkey,Error ** errp)104 void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm 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 QCryptoHashAlgorithm_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
qcrypto_nettle_hmac_ctx_free(QCryptoHmac * hmac)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
qcrypto_nettle_hmac_bytesv(QCryptoHmac * hmac,const struct iovec * iov,size_t niov,uint8_t ** result,size_t * resultlen,Error ** errp)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