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 | |