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ddbb0d09 DB |
1 | /* |
2 | * QEMU Crypto hash algorithms | |
3 | * | |
4 | * Copyright (c) 2015 Red Hat, Inc. | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
18 | * | |
19 | */ | |
20 | ||
42f7a448 | 21 | #include "qemu/osdep.h" |
da34e65c | 22 | #include "qapi/error.h" |
ddbb0d09 DB |
23 | #include "crypto/hash.h" |
24 | ||
25 | #ifdef CONFIG_GNUTLS_HASH | |
26 | #include <gnutls/gnutls.h> | |
27 | #include <gnutls/crypto.h> | |
c0377a7c | 28 | #endif |
ddbb0d09 | 29 | |
ddbb0d09 | 30 | |
d84b79d3 | 31 | static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = { |
7b36064c DB |
32 | [QCRYPTO_HASH_ALG_MD5] = 16, |
33 | [QCRYPTO_HASH_ALG_SHA1] = 20, | |
34 | [QCRYPTO_HASH_ALG_SHA256] = 32, | |
35 | }; | |
36 | ||
7b36064c DB |
37 | size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg) |
38 | { | |
b35c1f33 | 39 | assert(alg < G_N_ELEMENTS(qcrypto_hash_alg_size)); |
7b36064c DB |
40 | return qcrypto_hash_alg_size[alg]; |
41 | } | |
42 | ||
43 | ||
c0377a7c DB |
44 | #ifdef CONFIG_GNUTLS_HASH |
45 | static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = { | |
46 | [QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5, | |
47 | [QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1, | |
48 | [QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256, | |
49 | }; | |
50 | ||
51 | gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg) | |
52 | { | |
53 | if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map)) { | |
54 | return true; | |
55 | } | |
56 | return false; | |
57 | } | |
58 | ||
59 | ||
ddbb0d09 DB |
60 | int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg, |
61 | const struct iovec *iov, | |
62 | size_t niov, | |
63 | uint8_t **result, | |
64 | size_t *resultlen, | |
65 | Error **errp) | |
66 | { | |
67 | int i, ret; | |
68 | gnutls_hash_hd_t dig; | |
69 | ||
70 | if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map)) { | |
71 | error_setg(errp, | |
72 | "Unknown hash algorithm %d", | |
73 | alg); | |
74 | return -1; | |
75 | } | |
76 | ||
77 | ret = gnutls_hash_init(&dig, qcrypto_hash_alg_map[alg]); | |
78 | ||
79 | if (ret < 0) { | |
80 | error_setg(errp, | |
81 | "Unable to initialize hash algorithm: %s", | |
82 | gnutls_strerror(ret)); | |
83 | return -1; | |
84 | } | |
85 | ||
86 | for (i = 0; i < niov; i++) { | |
87 | ret = gnutls_hash(dig, iov[i].iov_base, iov[i].iov_len); | |
88 | if (ret < 0) { | |
89 | error_setg(errp, | |
90 | "Unable process hash data: %s", | |
91 | gnutls_strerror(ret)); | |
92 | goto error; | |
93 | } | |
94 | } | |
95 | ||
96 | ret = gnutls_hash_get_len(qcrypto_hash_alg_map[alg]); | |
97 | if (ret <= 0) { | |
98 | error_setg(errp, | |
99 | "Unable to get hash length: %s", | |
100 | gnutls_strerror(ret)); | |
101 | goto error; | |
102 | } | |
103 | if (*resultlen == 0) { | |
104 | *resultlen = ret; | |
105 | *result = g_new0(uint8_t, *resultlen); | |
106 | } else if (*resultlen != ret) { | |
107 | error_setg(errp, | |
108 | "Result buffer size %zu is smaller than hash %d", | |
109 | *resultlen, ret); | |
110 | goto error; | |
111 | } | |
112 | ||
113 | gnutls_hash_deinit(dig, *result); | |
114 | return 0; | |
115 | ||
116 | error: | |
117 | gnutls_hash_deinit(dig, NULL); | |
118 | return -1; | |
119 | } | |
120 | ||
121 | #else /* ! CONFIG_GNUTLS_HASH */ | |
122 | ||
123 | gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg G_GNUC_UNUSED) | |
124 | { | |
125 | return false; | |
126 | } | |
127 | ||
128 | int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg, | |
129 | const struct iovec *iov G_GNUC_UNUSED, | |
130 | size_t niov G_GNUC_UNUSED, | |
131 | uint8_t **result G_GNUC_UNUSED, | |
132 | size_t *resultlen G_GNUC_UNUSED, | |
133 | Error **errp) | |
134 | { | |
135 | error_setg(errp, | |
136 | "Hash algorithm %d not supported without GNUTLS", | |
137 | alg); | |
138 | return -1; | |
139 | } | |
140 | ||
141 | #endif /* ! CONFIG_GNUTLS_HASH */ | |
142 | ||
143 | int qcrypto_hash_bytes(QCryptoHashAlgorithm alg, | |
144 | const char *buf, | |
145 | size_t len, | |
146 | uint8_t **result, | |
147 | size_t *resultlen, | |
148 | Error **errp) | |
149 | { | |
150 | struct iovec iov = { .iov_base = (char *)buf, | |
151 | .iov_len = len }; | |
152 | return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp); | |
153 | } | |
154 | ||
155 | static const char hex[] = "0123456789abcdef"; | |
156 | ||
157 | int qcrypto_hash_digestv(QCryptoHashAlgorithm alg, | |
158 | const struct iovec *iov, | |
159 | size_t niov, | |
160 | char **digest, | |
161 | Error **errp) | |
162 | { | |
163 | uint8_t *result = NULL; | |
164 | size_t resultlen = 0; | |
165 | size_t i; | |
166 | ||
167 | if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) { | |
168 | return -1; | |
169 | } | |
170 | ||
171 | *digest = g_new0(char, (resultlen * 2) + 1); | |
172 | for (i = 0 ; i < resultlen ; i++) { | |
173 | (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf]; | |
174 | (*digest)[(i * 2) + 1] = hex[result[i] & 0xf]; | |
175 | } | |
176 | (*digest)[resultlen * 2] = '\0'; | |
177 | g_free(result); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | int qcrypto_hash_digest(QCryptoHashAlgorithm alg, | |
182 | const char *buf, | |
183 | size_t len, | |
184 | char **digest, | |
185 | Error **errp) | |
186 | { | |
187 | struct iovec iov = { .iov_base = (char *)buf, .iov_len = len }; | |
188 | ||
189 | return qcrypto_hash_digestv(alg, &iov, 1, digest, errp); | |
190 | } | |
191 | ||
192 | int qcrypto_hash_base64v(QCryptoHashAlgorithm alg, | |
193 | const struct iovec *iov, | |
194 | size_t niov, | |
195 | char **base64, | |
196 | Error **errp) | |
197 | { | |
198 | uint8_t *result = NULL; | |
199 | size_t resultlen = 0; | |
200 | ||
201 | if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) { | |
202 | return -1; | |
203 | } | |
204 | ||
205 | *base64 = g_base64_encode(result, resultlen); | |
206 | g_free(result); | |
207 | return 0; | |
208 | } | |
209 | ||
210 | int qcrypto_hash_base64(QCryptoHashAlgorithm alg, | |
211 | const char *buf, | |
212 | size_t len, | |
213 | char **base64, | |
214 | Error **errp) | |
215 | { | |
216 | struct iovec iov = { .iov_base = (char *)buf, .iov_len = len }; | |
217 | ||
218 | return qcrypto_hash_base64v(alg, &iov, 1, base64, errp); | |
219 | } |