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 <gcrypt.h> 23 #include "qapi/error.h" 24 #include "crypto/pbkdf.h" 25 26 bool qcrypto_pbkdf2_supports(QCryptoHashAlgo hash) 27 { 28 switch (hash) { 29 case QCRYPTO_HASH_ALGO_MD5: 30 case QCRYPTO_HASH_ALGO_SHA1: 31 case QCRYPTO_HASH_ALGO_SHA224: 32 case QCRYPTO_HASH_ALGO_SHA256: 33 case QCRYPTO_HASH_ALGO_SHA384: 34 case QCRYPTO_HASH_ALGO_SHA512: 35 case QCRYPTO_HASH_ALGO_RIPEMD160: 36 #ifdef CONFIG_CRYPTO_SM3 37 case QCRYPTO_HASH_ALGO_SM3: 38 #endif 39 return qcrypto_hash_supports(hash); 40 default: 41 return false; 42 } 43 } 44 45 int qcrypto_pbkdf2(QCryptoHashAlgo hash, 46 const uint8_t *key, size_t nkey, 47 const uint8_t *salt, size_t nsalt, 48 uint64_t iterations, 49 uint8_t *out, size_t nout, 50 Error **errp) 51 { 52 static const int hash_map[QCRYPTO_HASH_ALGO__MAX] = { 53 [QCRYPTO_HASH_ALGO_MD5] = GCRY_MD_MD5, 54 [QCRYPTO_HASH_ALGO_SHA1] = GCRY_MD_SHA1, 55 [QCRYPTO_HASH_ALGO_SHA224] = GCRY_MD_SHA224, 56 [QCRYPTO_HASH_ALGO_SHA256] = GCRY_MD_SHA256, 57 [QCRYPTO_HASH_ALGO_SHA384] = GCRY_MD_SHA384, 58 [QCRYPTO_HASH_ALGO_SHA512] = GCRY_MD_SHA512, 59 [QCRYPTO_HASH_ALGO_RIPEMD160] = GCRY_MD_RMD160, 60 #ifdef CONFIG_CRYPTO_SM3 61 [QCRYPTO_HASH_ALGO_SM3] = GCRY_MD_SM3, 62 #endif 63 }; 64 int ret; 65 66 if (iterations > ULONG_MAX) { 67 error_setg_errno(errp, ERANGE, 68 "PBKDF iterations %llu must be less than %lu", 69 (long long unsigned)iterations, ULONG_MAX); 70 return -1; 71 } 72 73 if (hash >= G_N_ELEMENTS(hash_map) || 74 hash_map[hash] == GCRY_MD_NONE) { 75 error_setg_errno(errp, ENOSYS, 76 "PBKDF does not support hash algorithm %s", 77 QCryptoHashAlgo_str(hash)); 78 return -1; 79 } 80 81 ret = gcry_kdf_derive(key, nkey, GCRY_KDF_PBKDF2, 82 hash_map[hash], 83 salt, nsalt, iterations, 84 nout, out); 85 if (ret != 0) { 86 error_setg(errp, "Cannot derive password: %s", 87 gcry_strerror(ret)); 88 return -1; 89 } 90 91 return 0; 92 } 93