1 /*
2 * QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
3 *
4 * Copyright (c) 2015-2016 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 2.1 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 "qemu/osdep.h"
22 #include <nettle/pbkdf2.h>
23 #include <nettle/hmac.h>
24 #include "qapi/error.h"
25 #include "crypto/pbkdf.h"
26
27
qcrypto_pbkdf2_supports(QCryptoHashAlgo hash)28 bool qcrypto_pbkdf2_supports(QCryptoHashAlgo hash)
29 {
30 switch (hash) {
31 case QCRYPTO_HASH_ALGO_SHA1:
32 case QCRYPTO_HASH_ALGO_SHA224:
33 case QCRYPTO_HASH_ALGO_SHA256:
34 case QCRYPTO_HASH_ALGO_SHA384:
35 case QCRYPTO_HASH_ALGO_SHA512:
36 case QCRYPTO_HASH_ALGO_RIPEMD160:
37 #ifdef CONFIG_CRYPTO_SM3
38 case QCRYPTO_HASH_ALGO_SM3:
39 #endif
40 return true;
41 default:
42 return false;
43 }
44 }
45
qcrypto_pbkdf2(QCryptoHashAlgo hash,const uint8_t * key,size_t nkey,const uint8_t * salt,size_t nsalt,uint64_t iterations,uint8_t * out,size_t nout,Error ** errp)46 int qcrypto_pbkdf2(QCryptoHashAlgo hash,
47 const uint8_t *key, size_t nkey,
48 const uint8_t *salt, size_t nsalt,
49 uint64_t iterations,
50 uint8_t *out, size_t nout,
51 Error **errp)
52 {
53 union {
54 struct hmac_md5_ctx md5;
55 struct hmac_sha1_ctx sha1;
56 struct hmac_sha224_ctx sha224;
57 struct hmac_sha256_ctx sha256;
58 struct hmac_sha384_ctx sha384;
59 struct hmac_sha512_ctx sha512;
60 struct hmac_ripemd160_ctx ripemd160;
61 #ifdef CONFIG_CRYPTO_SM3
62 struct hmac_sm3_ctx sm3;
63 #endif
64 } ctx;
65
66 if (iterations > UINT_MAX) {
67 error_setg_errno(errp, ERANGE,
68 "PBKDF iterations %llu must be less than %u",
69 (long long unsigned)iterations, UINT_MAX);
70 return -1;
71 }
72
73 switch (hash) {
74 case QCRYPTO_HASH_ALGO_MD5:
75 hmac_md5_set_key(&ctx.md5, nkey, key);
76 PBKDF2(&ctx.md5, hmac_md5_update, hmac_md5_digest,
77 MD5_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
78 break;
79
80 case QCRYPTO_HASH_ALGO_SHA1:
81 hmac_sha1_set_key(&ctx.sha1, nkey, key);
82 PBKDF2(&ctx.sha1, hmac_sha1_update, hmac_sha1_digest,
83 SHA1_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
84 break;
85
86 case QCRYPTO_HASH_ALGO_SHA224:
87 hmac_sha224_set_key(&ctx.sha224, nkey, key);
88 PBKDF2(&ctx.sha224, hmac_sha224_update, hmac_sha224_digest,
89 SHA224_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
90 break;
91
92 case QCRYPTO_HASH_ALGO_SHA256:
93 hmac_sha256_set_key(&ctx.sha256, nkey, key);
94 PBKDF2(&ctx.sha256, hmac_sha256_update, hmac_sha256_digest,
95 SHA256_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
96 break;
97
98 case QCRYPTO_HASH_ALGO_SHA384:
99 hmac_sha384_set_key(&ctx.sha384, nkey, key);
100 PBKDF2(&ctx.sha384, hmac_sha384_update, hmac_sha384_digest,
101 SHA384_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
102 break;
103
104 case QCRYPTO_HASH_ALGO_SHA512:
105 hmac_sha512_set_key(&ctx.sha512, nkey, key);
106 PBKDF2(&ctx.sha512, hmac_sha512_update, hmac_sha512_digest,
107 SHA512_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
108 break;
109
110 case QCRYPTO_HASH_ALGO_RIPEMD160:
111 hmac_ripemd160_set_key(&ctx.ripemd160, nkey, key);
112 PBKDF2(&ctx.ripemd160, hmac_ripemd160_update, hmac_ripemd160_digest,
113 RIPEMD160_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
114 break;
115 #ifdef CONFIG_CRYPTO_SM3
116 case QCRYPTO_HASH_ALGO_SM3:
117 hmac_sm3_set_key(&ctx.sm3, nkey, key);
118 PBKDF2(&ctx.sm3, hmac_sm3_update, hmac_sm3_digest,
119 SM3_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
120 break;
121 #endif
122
123 default:
124 error_setg_errno(errp, ENOSYS,
125 "PBKDF does not support hash algorithm %s",
126 QCryptoHashAlgo_str(hash));
127 return -1;
128 }
129 return 0;
130 }
131