1 /* 2 * QEMU Crypto cipher 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/cipher.h" 22 23 24 static size_t alg_key_len[QCRYPTO_CIPHER_ALG_LAST] = { 25 [QCRYPTO_CIPHER_ALG_AES_128] = 16, 26 [QCRYPTO_CIPHER_ALG_AES_192] = 24, 27 [QCRYPTO_CIPHER_ALG_AES_256] = 32, 28 [QCRYPTO_CIPHER_ALG_DES_RFB] = 8, 29 }; 30 31 static bool 32 qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg, 33 size_t nkey, 34 Error **errp) 35 { 36 if ((unsigned)alg >= QCRYPTO_CIPHER_ALG_LAST) { 37 error_setg(errp, "Cipher algorithm %d out of range", 38 alg); 39 return false; 40 } 41 42 if (alg_key_len[alg] != nkey) { 43 error_setg(errp, "Cipher key length %zu should be %zu", 44 alg_key_len[alg], nkey); 45 return false; 46 } 47 return true; 48 } 49 50 #if defined(CONFIG_GCRYPT) || defined(CONFIG_NETTLE) 51 static uint8_t * 52 qcrypto_cipher_munge_des_rfb_key(const uint8_t *key, 53 size_t nkey) 54 { 55 uint8_t *ret = g_new0(uint8_t, nkey); 56 size_t i; 57 for (i = 0; i < nkey; i++) { 58 uint8_t r = key[i]; 59 r = (r & 0xf0) >> 4 | (r & 0x0f) << 4; 60 r = (r & 0xcc) >> 2 | (r & 0x33) << 2; 61 r = (r & 0xaa) >> 1 | (r & 0x55) << 1; 62 ret[i] = r; 63 } 64 return ret; 65 } 66 #endif /* CONFIG_GCRYPT || CONFIG_NETTLE */ 67 68 #ifdef CONFIG_GCRYPT 69 #include "crypto/cipher-gcrypt.c" 70 #elif defined CONFIG_NETTLE 71 #include "crypto/cipher-nettle.c" 72 #else 73 #include "crypto/cipher-builtin.c" 74 #endif 75