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 * $FreeBSD$ 28 */ 29 30 #include <stdio.h> 31 #include <string.h> 32 #include <strings.h> 33 34 #include "geliboot_internal.h" 35 #include "geliboot.h" 36 37 int 38 geliboot_crypt(u_int algo, geli_op_t enc, u_char *data, size_t datasize, 39 const u_char *key, size_t keysize, u_char *iv, size_t ivlen) 40 { 41 keyInstance aeskey; 42 cipherInstance cipher; 43 struct aes_xts_ctx xtsctx, *ctxp; 44 size_t xts_len; 45 int err, blks, i; 46 47 switch (algo) { 48 case CRYPTO_AES_CBC: 49 err = rijndael_makeKey(&aeskey, !enc, keysize, 50 (const char *)key); 51 if (err < 0) { 52 printf("Failed to setup crypo keys: %d\n", err); 53 return (err); 54 } 55 56 err = rijndael_cipherInit(&cipher, MODE_CBC, iv); 57 if (err < 0) { 58 printf("Failed to setup IV: %d\n", err); 59 return (err); 60 } 61 62 switch (enc) { 63 case GELI_DECRYPT: 64 blks = rijndael_blockDecrypt(&cipher, &aeskey, data, 65 datasize * 8, data); 66 break; 67 case GELI_ENCRYPT: 68 blks = rijndael_blockEncrypt(&cipher, &aeskey, data, 69 datasize * 8, data); 70 break; 71 } 72 if (datasize != (blks / 8)) { 73 printf("Failed to %s the entire input: %u != %zu\n", 74 enc ? "decrypt" : "encrypt", 75 blks, datasize); 76 return (1); 77 } 78 break; 79 case CRYPTO_AES_XTS: 80 xts_len = keysize << 1; 81 ctxp = &xtsctx; 82 83 enc_xform_aes_xts.setkey(ctxp, key, xts_len / 8); 84 enc_xform_aes_xts.reinit(ctxp, iv, ivlen); 85 86 switch (enc) { 87 case GELI_DECRYPT: 88 for (i = 0; i < datasize; i += AES_XTS_BLOCKSIZE) { 89 enc_xform_aes_xts.decrypt(ctxp, data + i, 90 data + i); 91 } 92 break; 93 case GELI_ENCRYPT: 94 for (i = 0; i < datasize; i += AES_XTS_BLOCKSIZE) { 95 enc_xform_aes_xts.encrypt(ctxp, data + i, 96 data + i); 97 } 98 break; 99 } 100 break; 101 default: 102 printf("Unsupported crypto algorithm #%d\n", algo); 103 return (1); 104 } 105 106 return (0); 107 } 108 109 static int 110 g_eli_crypto_cipher(u_int algo, geli_op_t enc, u_char *data, size_t datasize, 111 const u_char *key, size_t keysize) 112 { 113 u_char iv[keysize]; 114 115 explicit_bzero(iv, sizeof(iv)); 116 return (geliboot_crypt(algo, enc, data, datasize, key, keysize, iv, 117 sizeof(iv))); 118 } 119 120 int 121 g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize, 122 const u_char *key, size_t keysize) 123 { 124 125 /* We prefer AES-CBC for metadata protection. */ 126 if (algo == CRYPTO_AES_XTS) 127 algo = CRYPTO_AES_CBC; 128 129 return (g_eli_crypto_cipher(algo, GELI_ENCRYPT, data, datasize, key, 130 keysize)); 131 } 132 133 int 134 g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize, 135 const u_char *key, size_t keysize) 136 { 137 138 /* We prefer AES-CBC for metadata protection. */ 139 if (algo == CRYPTO_AES_XTS) 140 algo = CRYPTO_AES_CBC; 141 142 return (g_eli_crypto_cipher(algo, GELI_DECRYPT, data, datasize, key, 143 keysize)); 144 } 145