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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 | ||
21 | #include "crypto/hash.h" | |
22 | ||
23 | #ifdef CONFIG_GNUTLS_HASH | |
24 | #include <gnutls/gnutls.h> | |
25 | #include <gnutls/crypto.h> | |
26 | ||
27 | static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG_LAST] = { | |
28 | [QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5, | |
29 | [QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1, | |
30 | [QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256, | |
31 | }; | |
32 | ||
33 | gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg) | |
34 | { | |
35 | if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map)) { | |
36 | return true; | |
37 | } | |
38 | return false; | |
39 | } | |
40 | ||
41 | int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg, | |
42 | const struct iovec *iov, | |
43 | size_t niov, | |
44 | uint8_t **result, | |
45 | size_t *resultlen, | |
46 | Error **errp) | |
47 | { | |
48 | int i, ret; | |
49 | gnutls_hash_hd_t dig; | |
50 | ||
51 | if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map)) { | |
52 | error_setg(errp, | |
53 | "Unknown hash algorithm %d", | |
54 | alg); | |
55 | return -1; | |
56 | } | |
57 | ||
58 | ret = gnutls_hash_init(&dig, qcrypto_hash_alg_map[alg]); | |
59 | ||
60 | if (ret < 0) { | |
61 | error_setg(errp, | |
62 | "Unable to initialize hash algorithm: %s", | |
63 | gnutls_strerror(ret)); | |
64 | return -1; | |
65 | } | |
66 | ||
67 | for (i = 0; i < niov; i++) { | |
68 | ret = gnutls_hash(dig, iov[i].iov_base, iov[i].iov_len); | |
69 | if (ret < 0) { | |
70 | error_setg(errp, | |
71 | "Unable process hash data: %s", | |
72 | gnutls_strerror(ret)); | |
73 | goto error; | |
74 | } | |
75 | } | |
76 | ||
77 | ret = gnutls_hash_get_len(qcrypto_hash_alg_map[alg]); | |
78 | if (ret <= 0) { | |
79 | error_setg(errp, | |
80 | "Unable to get hash length: %s", | |
81 | gnutls_strerror(ret)); | |
82 | goto error; | |
83 | } | |
84 | if (*resultlen == 0) { | |
85 | *resultlen = ret; | |
86 | *result = g_new0(uint8_t, *resultlen); | |
87 | } else if (*resultlen != ret) { | |
88 | error_setg(errp, | |
89 | "Result buffer size %zu is smaller than hash %d", | |
90 | *resultlen, ret); | |
91 | goto error; | |
92 | } | |
93 | ||
94 | gnutls_hash_deinit(dig, *result); | |
95 | return 0; | |
96 | ||
97 | error: | |
98 | gnutls_hash_deinit(dig, NULL); | |
99 | return -1; | |
100 | } | |
101 | ||
102 | #else /* ! CONFIG_GNUTLS_HASH */ | |
103 | ||
104 | gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg G_GNUC_UNUSED) | |
105 | { | |
106 | return false; | |
107 | } | |
108 | ||
109 | int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg, | |
110 | const struct iovec *iov G_GNUC_UNUSED, | |
111 | size_t niov G_GNUC_UNUSED, | |
112 | uint8_t **result G_GNUC_UNUSED, | |
113 | size_t *resultlen G_GNUC_UNUSED, | |
114 | Error **errp) | |
115 | { | |
116 | error_setg(errp, | |
117 | "Hash algorithm %d not supported without GNUTLS", | |
118 | alg); | |
119 | return -1; | |
120 | } | |
121 | ||
122 | #endif /* ! CONFIG_GNUTLS_HASH */ | |
123 | ||
124 | int qcrypto_hash_bytes(QCryptoHashAlgorithm alg, | |
125 | const char *buf, | |
126 | size_t len, | |
127 | uint8_t **result, | |
128 | size_t *resultlen, | |
129 | Error **errp) | |
130 | { | |
131 | struct iovec iov = { .iov_base = (char *)buf, | |
132 | .iov_len = len }; | |
133 | return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp); | |
134 | } | |
135 | ||
136 | static const char hex[] = "0123456789abcdef"; | |
137 | ||
138 | int qcrypto_hash_digestv(QCryptoHashAlgorithm alg, | |
139 | const struct iovec *iov, | |
140 | size_t niov, | |
141 | char **digest, | |
142 | Error **errp) | |
143 | { | |
144 | uint8_t *result = NULL; | |
145 | size_t resultlen = 0; | |
146 | size_t i; | |
147 | ||
148 | if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) { | |
149 | return -1; | |
150 | } | |
151 | ||
152 | *digest = g_new0(char, (resultlen * 2) + 1); | |
153 | for (i = 0 ; i < resultlen ; i++) { | |
154 | (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf]; | |
155 | (*digest)[(i * 2) + 1] = hex[result[i] & 0xf]; | |
156 | } | |
157 | (*digest)[resultlen * 2] = '\0'; | |
158 | g_free(result); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | int qcrypto_hash_digest(QCryptoHashAlgorithm alg, | |
163 | const char *buf, | |
164 | size_t len, | |
165 | char **digest, | |
166 | Error **errp) | |
167 | { | |
168 | struct iovec iov = { .iov_base = (char *)buf, .iov_len = len }; | |
169 | ||
170 | return qcrypto_hash_digestv(alg, &iov, 1, digest, errp); | |
171 | } | |
172 | ||
173 | int qcrypto_hash_base64v(QCryptoHashAlgorithm alg, | |
174 | const struct iovec *iov, | |
175 | size_t niov, | |
176 | char **base64, | |
177 | Error **errp) | |
178 | { | |
179 | uint8_t *result = NULL; | |
180 | size_t resultlen = 0; | |
181 | ||
182 | if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) { | |
183 | return -1; | |
184 | } | |
185 | ||
186 | *base64 = g_base64_encode(result, resultlen); | |
187 | g_free(result); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | int qcrypto_hash_base64(QCryptoHashAlgorithm alg, | |
192 | const char *buf, | |
193 | size_t len, | |
194 | char **base64, | |
195 | Error **errp) | |
196 | { | |
197 | struct iovec iov = { .iov_base = (char *)buf, .iov_len = len }; | |
198 | ||
199 | return qcrypto_hash_base64v(alg, &iov, 1, base64, errp); | |
200 | } |