1 /* $OpenBSD: xform.c,v 1.16 2001/08/28 12:20:43 ben Exp $ */ 2 /*- 3 * The authors of this code are John Ioannidis (ji@tla.org), 4 * Angelos D. Keromytis (kermit@csd.uch.gr), 5 * Niels Provos (provos@physnet.uni-hamburg.de) and 6 * Damien Miller (djm@mindrot.org). 7 * 8 * This code was written by John Ioannidis for BSD/OS in Athens, Greece, 9 * in November 1995. 10 * 11 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 12 * by Angelos D. Keromytis. 13 * 14 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 15 * and Niels Provos. 16 * 17 * Additional features in 1999 by Angelos D. Keromytis. 18 * 19 * AES XTS implementation in 2008 by Damien Miller 20 * 21 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 22 * Angelos D. Keromytis and Niels Provos. 23 * 24 * Copyright (C) 2001, Angelos D. Keromytis. 25 * 26 * Copyright (C) 2008, Damien Miller 27 * Copyright (c) 2014 The FreeBSD Foundation 28 * All rights reserved. 29 * 30 * Portions of this software were developed by John-Mark Gurney 31 * under sponsorship of the FreeBSD Foundation and 32 * Rubicon Communications, LLC (Netgate). 33 * 34 * Permission to use, copy, and modify this software with or without fee 35 * is hereby granted, provided that this entire notice is included in 36 * all copies of any software which is or includes a copy or 37 * modification of this software. 38 * You may use this code under the GNU public license if you so wish. Please 39 * contribute changes back to the authors under this freer than GPL license 40 * so that we may further the use of strong encryption without limitations to 41 * all. 42 * 43 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 44 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 45 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 46 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 47 * PURPOSE. 48 */ 49 50 #include <sys/cdefs.h> 51 #include <sys/types.h> 52 #include <crypto/camellia/camellia.h> 53 #include <opencrypto/xform_enc.h> 54 55 struct camellia_cbc_ctx { 56 camellia_ctx state; 57 char iv[CAMELLIA_BLOCK_LEN]; 58 }; 59 60 static int cml_setkey(void *, const uint8_t *, int); 61 static void cml_encrypt(void *, const uint8_t *, uint8_t *); 62 static void cml_decrypt(void *, const uint8_t *, uint8_t *); 63 static void cml_encrypt_multi(void *, const uint8_t *, uint8_t *, size_t); 64 static void cml_decrypt_multi(void *, const uint8_t *, uint8_t *, size_t); 65 static void cml_reinit(void *, const uint8_t *, size_t); 66 67 /* Encryption instances */ 68 const struct enc_xform enc_xform_camellia = { 69 .type = CRYPTO_CAMELLIA_CBC, 70 .name = "Camellia-CBC", 71 .ctxsize = sizeof(struct camellia_cbc_ctx), 72 .blocksize = CAMELLIA_BLOCK_LEN, 73 .ivsize = CAMELLIA_BLOCK_LEN, 74 .minkey = CAMELLIA_MIN_KEY, 75 .maxkey = CAMELLIA_MAX_KEY, 76 .setkey = cml_setkey, 77 .reinit = cml_reinit, 78 .encrypt = cml_encrypt, 79 .decrypt = cml_decrypt, 80 .encrypt_multi = cml_encrypt_multi, 81 .decrypt_multi = cml_decrypt_multi, 82 }; 83 84 /* 85 * Encryption wrapper routines. 86 */ 87 static void 88 cml_encrypt(void *vctx, const uint8_t *in, uint8_t *out) 89 { 90 struct camellia_cbc_ctx *ctx = vctx; 91 92 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++) 93 out[i] = in[i] ^ ctx->iv[i]; 94 camellia_encrypt(&ctx->state, out, out); 95 memcpy(ctx->iv, out, CAMELLIA_BLOCK_LEN); 96 } 97 98 static void 99 cml_decrypt(void *vctx, const uint8_t *in, uint8_t *out) 100 { 101 struct camellia_cbc_ctx *ctx = vctx; 102 char block[CAMELLIA_BLOCK_LEN]; 103 104 memcpy(block, in, CAMELLIA_BLOCK_LEN); 105 camellia_decrypt(&ctx->state, in, out); 106 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++) 107 out[i] ^= ctx->iv[i]; 108 memcpy(ctx->iv, block, CAMELLIA_BLOCK_LEN); 109 explicit_bzero(block, sizeof(block)); 110 } 111 112 static void 113 cml_encrypt_multi(void *vctx, const uint8_t *in, uint8_t *out, size_t len) 114 { 115 struct camellia_cbc_ctx *ctx = vctx; 116 117 KASSERT(len % CAMELLIA_BLOCK_LEN == 0, ("%s: invalid length", 118 __func__)); 119 while (len > 0) { 120 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++) 121 out[i] = in[i] ^ ctx->iv[i]; 122 camellia_encrypt(&ctx->state, out, out); 123 memcpy(ctx->iv, out, CAMELLIA_BLOCK_LEN); 124 out += CAMELLIA_BLOCK_LEN; 125 in += CAMELLIA_BLOCK_LEN; 126 len -= CAMELLIA_BLOCK_LEN; 127 } 128 } 129 130 static void 131 cml_decrypt_multi(void *vctx, const uint8_t *in, uint8_t *out, size_t len) 132 { 133 struct camellia_cbc_ctx *ctx = vctx; 134 char block[CAMELLIA_BLOCK_LEN]; 135 136 KASSERT(len % CAMELLIA_BLOCK_LEN == 0, ("%s: invalid length", 137 __func__)); 138 while (len > 0) { 139 memcpy(block, in, CAMELLIA_BLOCK_LEN); 140 camellia_decrypt(&ctx->state, in, out); 141 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++) 142 out[i] ^= ctx->iv[i]; 143 memcpy(ctx->iv, block, CAMELLIA_BLOCK_LEN); 144 out += CAMELLIA_BLOCK_LEN; 145 in += CAMELLIA_BLOCK_LEN; 146 len -= CAMELLIA_BLOCK_LEN; 147 } 148 explicit_bzero(block, sizeof(block)); 149 } 150 151 static int 152 cml_setkey(void *vctx, const uint8_t *key, int len) 153 { 154 struct camellia_cbc_ctx *ctx = vctx; 155 156 if (len != 16 && len != 24 && len != 32) 157 return (EINVAL); 158 159 camellia_set_key(&ctx->state, key, len * 8); 160 return (0); 161 } 162 163 static void 164 cml_reinit(void *vctx, const uint8_t *iv, size_t iv_len) 165 { 166 struct camellia_cbc_ctx *ctx = vctx; 167 168 KASSERT(iv_len == sizeof(ctx->iv), ("%s: bad IV length", __func__)); 169 memcpy(ctx->iv, iv, sizeof(ctx->iv)); 170 } 171