1 /*- 2 * Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * Copyright (c) 2004 Mark R V Murray 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 /* $OpenBSD: via.c,v 1.3 2004/06/15 23:36:55 deraadt Exp $ */ 29 /*- 30 * Copyright (c) 2003 Jason Wright 31 * Copyright (c) 2003, 2004 Theo de Raadt 32 * All rights reserved. 33 * 34 * Permission to use, copy, modify, and distribute this software for any 35 * purpose with or without fee is hereby granted, provided that the above 36 * copyright notice and this permission notice appear in all copies. 37 * 38 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 39 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 40 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 41 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 42 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 43 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 44 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 45 */ 46 47 #include <sys/cdefs.h> 48 __FBSDID("$FreeBSD$"); 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/kernel.h> 53 #include <sys/module.h> 54 #include <sys/malloc.h> 55 #include <sys/libkern.h> 56 #include <sys/pcpu.h> 57 #include <sys/uio.h> 58 59 #include <opencrypto/cryptodev.h> 60 #include <crypto/rijndael/rijndael.h> 61 62 #include <crypto/via/padlock.h> 63 64 #define PADLOCK_ROUND_COUNT_AES128 10 65 #define PADLOCK_ROUND_COUNT_AES192 12 66 #define PADLOCK_ROUND_COUNT_AES256 14 67 68 #define PADLOCK_ALGORITHM_TYPE_AES 0 69 70 #define PADLOCK_KEY_GENERATION_HW 0 71 #define PADLOCK_KEY_GENERATION_SW 1 72 73 #define PADLOCK_DIRECTION_ENCRYPT 0 74 #define PADLOCK_DIRECTION_DECRYPT 1 75 76 #define PADLOCK_KEY_SIZE_128 0 77 #define PADLOCK_KEY_SIZE_192 1 78 #define PADLOCK_KEY_SIZE_256 2 79 80 MALLOC_DECLARE(M_PADLOCK); 81 82 static __inline void 83 padlock_cbc(void *in, void *out, size_t count, void *key, union padlock_cw *cw, 84 void *iv) 85 { 86 /* The .byte line is really VIA C3 "xcrypt-cbc" instruction */ 87 __asm __volatile( 88 "pushf \n\t" 89 "popf \n\t" 90 "rep \n\t" 91 ".byte 0x0f, 0xa7, 0xd0" 92 : "+a" (iv), "+c" (count), "+D" (out), "+S" (in) 93 : "b" (key), "d" (cw) 94 : "cc", "memory" 95 ); 96 } 97 98 static void 99 padlock_cipher_key_setup(struct padlock_session *ses, const void *key, int klen) 100 { 101 union padlock_cw *cw; 102 int i; 103 104 cw = &ses->ses_cw; 105 if (cw->cw_key_generation == PADLOCK_KEY_GENERATION_SW) { 106 /* Build expanded keys for both directions */ 107 rijndaelKeySetupEnc(ses->ses_ekey, key, klen * 8); 108 rijndaelKeySetupDec(ses->ses_dkey, key, klen * 8); 109 for (i = 0; i < 4 * (RIJNDAEL_MAXNR + 1); i++) { 110 ses->ses_ekey[i] = ntohl(ses->ses_ekey[i]); 111 ses->ses_dkey[i] = ntohl(ses->ses_dkey[i]); 112 } 113 } else { 114 bcopy(key, ses->ses_ekey, klen); 115 bcopy(key, ses->ses_dkey, klen); 116 } 117 } 118 119 int 120 padlock_cipher_setup(struct padlock_session *ses, 121 const struct crypto_session_params *csp) 122 { 123 union padlock_cw *cw; 124 125 if (csp->csp_cipher_klen != 16 && csp->csp_cipher_klen != 24 && 126 csp->csp_cipher_klen != 32) { 127 return (EINVAL); 128 } 129 130 cw = &ses->ses_cw; 131 bzero(cw, sizeof(*cw)); 132 cw->cw_algorithm_type = PADLOCK_ALGORITHM_TYPE_AES; 133 cw->cw_key_generation = PADLOCK_KEY_GENERATION_SW; 134 cw->cw_intermediate = 0; 135 switch (csp->csp_cipher_klen * 8) { 136 case 128: 137 cw->cw_round_count = PADLOCK_ROUND_COUNT_AES128; 138 cw->cw_key_size = PADLOCK_KEY_SIZE_128; 139 #ifdef HW_KEY_GENERATION 140 /* This doesn't buy us much, that's why it is commented out. */ 141 cw->cw_key_generation = PADLOCK_KEY_GENERATION_HW; 142 #endif 143 break; 144 case 192: 145 cw->cw_round_count = PADLOCK_ROUND_COUNT_AES192; 146 cw->cw_key_size = PADLOCK_KEY_SIZE_192; 147 break; 148 case 256: 149 cw->cw_round_count = PADLOCK_ROUND_COUNT_AES256; 150 cw->cw_key_size = PADLOCK_KEY_SIZE_256; 151 break; 152 } 153 if (csp->csp_cipher_key != NULL) { 154 padlock_cipher_key_setup(ses, csp->csp_cipher_key, 155 csp->csp_cipher_klen); 156 } 157 return (0); 158 } 159 160 /* 161 * Function checks if the given buffer is already 16 bytes aligned. 162 * If it is there is no need to allocate new buffer. 163 * If it isn't, new buffer is allocated. 164 */ 165 static u_char * 166 padlock_cipher_alloc(struct cryptop *crp, int *allocated) 167 { 168 u_char *addr; 169 170 addr = crypto_contiguous_subsegment(crp, crp->crp_payload_start, 171 crp->crp_payload_length); 172 if (((uintptr_t)addr & 0xf) == 0) { /* 16 bytes aligned? */ 173 *allocated = 0; 174 return (addr); 175 } 176 177 *allocated = 1; 178 addr = malloc(crp->crp_payload_length + 16, M_PADLOCK, M_NOWAIT); 179 return (addr); 180 } 181 182 int 183 padlock_cipher_process(struct padlock_session *ses, struct cryptop *crp, 184 const struct crypto_session_params *csp) 185 { 186 union padlock_cw *cw; 187 struct thread *td; 188 u_char *buf, *abuf; 189 uint32_t *key; 190 uint8_t iv[AES_BLOCK_LEN] __aligned(16); 191 int allocated; 192 193 buf = padlock_cipher_alloc(crp, &allocated); 194 if (buf == NULL) 195 return (ENOMEM); 196 /* Buffer has to be 16 bytes aligned. */ 197 abuf = PADLOCK_ALIGN(buf); 198 199 if (crp->crp_cipher_key != NULL) { 200 padlock_cipher_key_setup(ses, crp->crp_cipher_key, 201 csp->csp_cipher_klen); 202 } 203 204 cw = &ses->ses_cw; 205 cw->cw_filler0 = 0; 206 cw->cw_filler1 = 0; 207 cw->cw_filler2 = 0; 208 cw->cw_filler3 = 0; 209 210 crypto_read_iv(crp, iv); 211 212 if (CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) { 213 cw->cw_direction = PADLOCK_DIRECTION_ENCRYPT; 214 key = ses->ses_ekey; 215 } else { 216 cw->cw_direction = PADLOCK_DIRECTION_DECRYPT; 217 key = ses->ses_dkey; 218 } 219 220 if (allocated) { 221 crypto_copydata(crp, crp->crp_payload_start, 222 crp->crp_payload_length, abuf); 223 } 224 225 td = curthread; 226 fpu_kern_enter(td, ses->ses_fpu_ctx, FPU_KERN_NORMAL | FPU_KERN_KTHR); 227 padlock_cbc(abuf, abuf, crp->crp_payload_length / AES_BLOCK_LEN, key, 228 cw, iv); 229 fpu_kern_leave(td, ses->ses_fpu_ctx); 230 231 if (allocated) { 232 crypto_copyback(crp, crp->crp_payload_start, 233 crp->crp_payload_length, abuf); 234 235 zfree(buf, M_PADLOCK); 236 } 237 return (0); 238 } 239