Merge remote-tracking branch 'remotes/kraxel/tags/pull-vga-20170103-1' into staging
[qemu.git] / 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 <nettle/hmac.h>
19
20 typedef void (*qcrypto_nettle_hmac_setkey)(void *ctx,
21 size_t key_length, const uint8_t *key);
22
23 typedef void (*qcrypto_nettle_hmac_update)(void *ctx,
24 size_t length, const uint8_t *data);
25
26 typedef void (*qcrypto_nettle_hmac_digest)(void *ctx,
27 size_t length, uint8_t *digest);
28
29 typedef struct QCryptoHmacNettle QCryptoHmacNettle;
30 struct QCryptoHmacNettle {
31 union qcrypto_nettle_hmac_ctx {
32 struct hmac_md5_ctx md5_ctx;
33 struct hmac_sha1_ctx sha1_ctx;
34 struct hmac_sha256_ctx sha256_ctx; /* equals hmac_sha224_ctx */
35 struct hmac_sha512_ctx sha512_ctx; /* equals hmac_sha384_ctx */
36 struct hmac_ripemd160_ctx ripemd160_ctx;
37 } u;
38 };
39
40 struct qcrypto_nettle_hmac_alg {
41 qcrypto_nettle_hmac_setkey setkey;
42 qcrypto_nettle_hmac_update update;
43 qcrypto_nettle_hmac_digest digest;
44 size_t len;
45 } qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
46 [QCRYPTO_HASH_ALG_MD5] = {
47 .setkey = (qcrypto_nettle_hmac_setkey)hmac_md5_set_key,
48 .update = (qcrypto_nettle_hmac_update)hmac_md5_update,
49 .digest = (qcrypto_nettle_hmac_digest)hmac_md5_digest,
50 .len = MD5_DIGEST_SIZE,
51 },
52 [QCRYPTO_HASH_ALG_SHA1] = {
53 .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha1_set_key,
54 .update = (qcrypto_nettle_hmac_update)hmac_sha1_update,
55 .digest = (qcrypto_nettle_hmac_digest)hmac_sha1_digest,
56 .len = SHA1_DIGEST_SIZE,
57 },
58 [QCRYPTO_HASH_ALG_SHA224] = {
59 .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha224_set_key,
60 .update = (qcrypto_nettle_hmac_update)hmac_sha224_update,
61 .digest = (qcrypto_nettle_hmac_digest)hmac_sha224_digest,
62 .len = SHA224_DIGEST_SIZE,
63 },
64 [QCRYPTO_HASH_ALG_SHA256] = {
65 .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha256_set_key,
66 .update = (qcrypto_nettle_hmac_update)hmac_sha256_update,
67 .digest = (qcrypto_nettle_hmac_digest)hmac_sha256_digest,
68 .len = SHA256_DIGEST_SIZE,
69 },
70 [QCRYPTO_HASH_ALG_SHA384] = {
71 .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha384_set_key,
72 .update = (qcrypto_nettle_hmac_update)hmac_sha384_update,
73 .digest = (qcrypto_nettle_hmac_digest)hmac_sha384_digest,
74 .len = SHA384_DIGEST_SIZE,
75 },
76 [QCRYPTO_HASH_ALG_SHA512] = {
77 .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha512_set_key,
78 .update = (qcrypto_nettle_hmac_update)hmac_sha512_update,
79 .digest = (qcrypto_nettle_hmac_digest)hmac_sha512_digest,
80 .len = SHA512_DIGEST_SIZE,
81 },
82 [QCRYPTO_HASH_ALG_RIPEMD160] = {
83 .setkey = (qcrypto_nettle_hmac_setkey)hmac_ripemd160_set_key,
84 .update = (qcrypto_nettle_hmac_update)hmac_ripemd160_update,
85 .digest = (qcrypto_nettle_hmac_digest)hmac_ripemd160_digest,
86 .len = RIPEMD160_DIGEST_SIZE,
87 },
88 };
89
90 bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
91 {
92 if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
93 qcrypto_hmac_alg_map[alg].setkey != NULL) {
94 return true;
95 }
96
97 return false;
98 }
99
100 QCryptoHmac *qcrypto_hmac_new(QCryptoHashAlgorithm alg,
101 const uint8_t *key, size_t nkey,
102 Error **errp)
103 {
104 QCryptoHmac *hmac;
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 hmac = g_new0(QCryptoHmac, 1);
114 hmac->alg = alg;
115
116 ctx = g_new0(QCryptoHmacNettle, 1);
117
118 qcrypto_hmac_alg_map[alg].setkey(&ctx->u, nkey, key);
119
120 hmac->opaque = ctx;
121
122 return hmac;
123 }
124
125 void qcrypto_hmac_free(QCryptoHmac *hmac)
126 {
127 QCryptoHmacNettle *ctx;
128
129 if (!hmac) {
130 return;
131 }
132
133 ctx = hmac->opaque;
134
135 g_free(ctx);
136 g_free(hmac);
137 }
138
139 int qcrypto_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 int 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 }