1 /*- 2 * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * Copyright (c) 2015 Allan Jude <allanjude@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <stdio.h> 29 #include <string.h> 30 #include <strings.h> 31 32 #include "geliboot_internal.h" 33 #include "geliboot.h" 34 35 int 36 geliboot_crypt(u_int algo, geli_op_t enc, u_char *data, size_t datasize, 37 const u_char *key, size_t keysize, u_char *iv) 38 { 39 keyInstance aeskey; 40 cipherInstance cipher; 41 struct aes_xts_ctx xtsctx, *ctxp; 42 size_t xts_len; 43 int err, blks; 44 45 switch (algo) { 46 case CRYPTO_AES_CBC: 47 err = rijndael_makeKey(&aeskey, !enc, keysize, 48 (const char *)key); 49 if (err < 0) { 50 printf("Failed to setup crypo keys: %d\n", err); 51 return (err); 52 } 53 54 err = rijndael_cipherInit(&cipher, MODE_CBC, iv); 55 if (err < 0) { 56 printf("Failed to setup IV: %d\n", err); 57 return (err); 58 } 59 60 switch (enc) { 61 case GELI_DECRYPT: 62 blks = rijndael_blockDecrypt(&cipher, &aeskey, data, 63 datasize * 8, data); 64 break; 65 case GELI_ENCRYPT: 66 blks = rijndael_blockEncrypt(&cipher, &aeskey, data, 67 datasize * 8, data); 68 break; 69 } 70 if (datasize != (blks / 8)) { 71 printf("Failed to %s the entire input: %u != %zu\n", 72 enc ? "decrypt" : "encrypt", 73 blks, datasize); 74 return (1); 75 } 76 break; 77 case CRYPTO_AES_XTS: 78 xts_len = keysize << 1; 79 ctxp = &xtsctx; 80 81 enc_xform_aes_xts.setkey(ctxp, key, xts_len / 8); 82 enc_xform_aes_xts.reinit(ctxp, iv, AES_XTS_IV_LEN); 83 84 switch (enc) { 85 case GELI_DECRYPT: 86 enc_xform_aes_xts.decrypt_multi(ctxp, data, data, 87 datasize); 88 break; 89 case GELI_ENCRYPT: 90 enc_xform_aes_xts.encrypt_multi(ctxp, data, data, 91 datasize); 92 break; 93 } 94 break; 95 default: 96 printf("Unsupported crypto algorithm #%d\n", algo); 97 return (1); 98 } 99 100 return (0); 101 } 102 103 static int 104 g_eli_crypto_cipher(u_int algo, geli_op_t enc, u_char *data, size_t datasize, 105 const u_char *key, size_t keysize) 106 { 107 u_char iv[G_ELI_IVKEYLEN]; 108 109 explicit_bzero(iv, sizeof(iv)); 110 return (geliboot_crypt(algo, enc, data, datasize, key, keysize, iv)); 111 } 112 113 int 114 g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize, 115 const u_char *key, size_t keysize) 116 { 117 118 /* We prefer AES-CBC for metadata protection. */ 119 if (algo == CRYPTO_AES_XTS) 120 algo = CRYPTO_AES_CBC; 121 122 return (g_eli_crypto_cipher(algo, GELI_ENCRYPT, data, datasize, key, 123 keysize)); 124 } 125 126 int 127 g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize, 128 const u_char *key, size_t keysize) 129 { 130 131 /* We prefer AES-CBC for metadata protection. */ 132 if (algo == CRYPTO_AES_XTS) 133 algo = CRYPTO_AES_CBC; 134 135 return (g_eli_crypto_cipher(algo, GELI_DECRYPT, data, datasize, key, 136 keysize)); 137 } 138