g_eli_crypto.c revision 271148
1148456Spjd/*- 2213072Spjd * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3148456Spjd * All rights reserved. 4148456Spjd * 5148456Spjd * Redistribution and use in source and binary forms, with or without 6148456Spjd * modification, are permitted provided that the following conditions 7148456Spjd * are met: 8148456Spjd * 1. Redistributions of source code must retain the above copyright 9148456Spjd * notice, this list of conditions and the following disclaimer. 10148456Spjd * 2. Redistributions in binary form must reproduce the above copyright 11148456Spjd * notice, this list of conditions and the following disclaimer in the 12148456Spjd * documentation and/or other materials provided with the distribution. 13155174Spjd * 14148456Spjd * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15148456Spjd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16148456Spjd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17148456Spjd * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18148456Spjd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19148456Spjd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20148456Spjd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21148456Spjd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22148456Spjd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23148456Spjd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24148456Spjd * SUCH DAMAGE. 25148456Spjd */ 26148456Spjd 27148456Spjd#include <sys/cdefs.h> 28148456Spjd__FBSDID("$FreeBSD: head/sys/geom/eli/g_eli_crypto.c 271148 2014-09-04 23:53:51Z jmg $"); 29148456Spjd 30148456Spjd#include <sys/param.h> 31148456Spjd#ifdef _KERNEL 32148456Spjd#include <sys/systm.h> 33148456Spjd#include <sys/kernel.h> 34148456Spjd#include <sys/malloc.h> 35148456Spjd#else 36148456Spjd#include <stdint.h> 37148456Spjd#include <string.h> 38148456Spjd#include <strings.h> 39148456Spjd#include <errno.h> 40148456Spjd#include <assert.h> 41148456Spjd#include <openssl/evp.h> 42148456Spjd#define _OpenSSL_ 43148456Spjd#endif 44148456Spjd#include <geom/eli/g_eli.h> 45148456Spjd 46148456Spjd#ifdef _KERNEL 47148456SpjdMALLOC_DECLARE(M_ELI); 48148456Spjd 49148456Spjdstatic int 50148456Spjdg_eli_crypto_done(struct cryptop *crp) 51148456Spjd{ 52148456Spjd 53148456Spjd crp->crp_opaque = (void *)crp; 54148456Spjd wakeup(crp); 55148456Spjd return (0); 56148456Spjd} 57148456Spjd 58148456Spjdstatic int 59148456Spjdg_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize, 60148456Spjd const u_char *key, size_t keysize) 61148456Spjd{ 62148456Spjd struct cryptoini cri; 63148456Spjd struct cryptop *crp; 64148456Spjd struct cryptodesc *crd; 65148456Spjd uint64_t sid; 66148456Spjd u_char *p; 67148456Spjd int error; 68148456Spjd 69213070Spjd KASSERT(algo != CRYPTO_AES_XTS, 70213070Spjd ("%s: CRYPTO_AES_XTS unexpected here", __func__)); 71213070Spjd 72148456Spjd bzero(&cri, sizeof(cri)); 73148456Spjd cri.cri_alg = algo; 74148456Spjd cri.cri_key = __DECONST(void *, key); 75148456Spjd cri.cri_klen = keysize; 76167755Ssam error = crypto_newsession(&sid, &cri, CRYPTOCAP_F_SOFTWARE); 77148456Spjd if (error != 0) 78148456Spjd return (error); 79271148Sjmg p = malloc(sizeof(*crp) + sizeof(*crd), M_ELI, M_NOWAIT | M_ZERO); 80148456Spjd if (p == NULL) { 81148456Spjd crypto_freesession(sid); 82148456Spjd return (ENOMEM); 83148456Spjd } 84148456Spjd crp = (struct cryptop *)p; p += sizeof(*crp); 85148456Spjd crd = (struct cryptodesc *)p; p += sizeof(*crd); 86148456Spjd 87148456Spjd crd->crd_skip = 0; 88148456Spjd crd->crd_len = datasize; 89157900Spjd crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 90148456Spjd if (enc) 91148456Spjd crd->crd_flags |= CRD_F_ENCRYPT; 92148456Spjd crd->crd_alg = algo; 93148456Spjd crd->crd_key = __DECONST(void *, key); 94148456Spjd crd->crd_klen = keysize; 95148456Spjd bzero(crd->crd_iv, sizeof(crd->crd_iv)); 96148456Spjd crd->crd_next = NULL; 97148456Spjd 98148456Spjd crp->crp_sid = sid; 99148456Spjd crp->crp_ilen = datasize; 100148456Spjd crp->crp_olen = datasize; 101148456Spjd crp->crp_opaque = NULL; 102148456Spjd crp->crp_callback = g_eli_crypto_done; 103271148Sjmg crp->crp_buf = (void *)data; 104271148Sjmg crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_REL; 105148456Spjd crp->crp_desc = crd; 106148456Spjd 107148456Spjd error = crypto_dispatch(crp); 108148456Spjd if (error == 0) { 109148456Spjd while (crp->crp_opaque == NULL) 110148456Spjd tsleep(crp, PRIBIO, "geli", hz / 5); 111148456Spjd error = crp->crp_etype; 112148456Spjd } 113148456Spjd 114148456Spjd free(crp, M_ELI); 115148456Spjd crypto_freesession(sid); 116148456Spjd return (error); 117148456Spjd} 118148456Spjd#else /* !_KERNEL */ 119148456Spjdstatic int 120148456Spjdg_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize, 121148456Spjd const u_char *key, size_t keysize) 122148456Spjd{ 123148456Spjd EVP_CIPHER_CTX ctx; 124148456Spjd const EVP_CIPHER *type; 125148456Spjd u_char iv[keysize]; 126148456Spjd int outsize; 127148456Spjd 128213070Spjd assert(algo != CRYPTO_AES_XTS); 129213070Spjd 130148456Spjd switch (algo) { 131148456Spjd case CRYPTO_NULL_CBC: 132148456Spjd type = EVP_enc_null(); 133148456Spjd break; 134148456Spjd case CRYPTO_AES_CBC: 135148456Spjd switch (keysize) { 136148456Spjd case 128: 137148456Spjd type = EVP_aes_128_cbc(); 138148456Spjd break; 139148456Spjd case 192: 140148456Spjd type = EVP_aes_192_cbc(); 141148456Spjd break; 142148456Spjd case 256: 143148456Spjd type = EVP_aes_256_cbc(); 144148456Spjd break; 145148456Spjd default: 146148456Spjd return (EINVAL); 147148456Spjd } 148148456Spjd break; 149148456Spjd case CRYPTO_BLF_CBC: 150148456Spjd type = EVP_bf_cbc(); 151148456Spjd break; 152173746Sjb#ifndef OPENSSL_NO_CAMELLIA 153172031Spjd case CRYPTO_CAMELLIA_CBC: 154172031Spjd switch (keysize) { 155172031Spjd case 128: 156172031Spjd type = EVP_camellia_128_cbc(); 157172031Spjd break; 158172031Spjd case 192: 159172031Spjd type = EVP_camellia_192_cbc(); 160172031Spjd break; 161172031Spjd case 256: 162172031Spjd type = EVP_camellia_256_cbc(); 163172031Spjd break; 164172031Spjd default: 165172031Spjd return (EINVAL); 166172031Spjd } 167172031Spjd break; 168173746Sjb#endif 169148456Spjd case CRYPTO_3DES_CBC: 170148456Spjd type = EVP_des_ede3_cbc(); 171148456Spjd break; 172148456Spjd default: 173148456Spjd return (EINVAL); 174148456Spjd } 175148456Spjd 176148456Spjd EVP_CIPHER_CTX_init(&ctx); 177148456Spjd 178148456Spjd EVP_CipherInit_ex(&ctx, type, NULL, NULL, NULL, enc); 179148456Spjd EVP_CIPHER_CTX_set_key_length(&ctx, keysize / 8); 180148456Spjd EVP_CIPHER_CTX_set_padding(&ctx, 0); 181148456Spjd bzero(iv, sizeof(iv)); 182148456Spjd EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, enc); 183148456Spjd 184148456Spjd if (EVP_CipherUpdate(&ctx, data, &outsize, data, datasize) == 0) { 185148456Spjd EVP_CIPHER_CTX_cleanup(&ctx); 186148456Spjd return (EINVAL); 187148456Spjd } 188148456Spjd assert(outsize == (int)datasize); 189148456Spjd 190148456Spjd if (EVP_CipherFinal_ex(&ctx, data + outsize, &outsize) == 0) { 191148456Spjd EVP_CIPHER_CTX_cleanup(&ctx); 192148456Spjd return (EINVAL); 193148456Spjd } 194148456Spjd assert(outsize == 0); 195148456Spjd 196148456Spjd EVP_CIPHER_CTX_cleanup(&ctx); 197148456Spjd return (0); 198148456Spjd} 199148456Spjd#endif /* !_KERNEL */ 200148456Spjd 201148456Spjdint 202148456Spjdg_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize, 203148456Spjd const u_char *key, size_t keysize) 204148456Spjd{ 205148456Spjd 206213070Spjd /* We prefer AES-CBC for metadata protection. */ 207213070Spjd if (algo == CRYPTO_AES_XTS) 208213070Spjd algo = CRYPTO_AES_CBC; 209213070Spjd 210148456Spjd return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize)); 211148456Spjd} 212148456Spjd 213148456Spjdint 214148456Spjdg_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize, 215148456Spjd const u_char *key, size_t keysize) 216148456Spjd{ 217148456Spjd 218213070Spjd /* We prefer AES-CBC for metadata protection. */ 219213070Spjd if (algo == CRYPTO_AES_XTS) 220213070Spjd algo = CRYPTO_AES_CBC; 221213070Spjd 222148456Spjd return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize)); 223148456Spjd} 224148456Spjd 225148456Spjdvoid 226148456Spjdg_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey, 227148456Spjd size_t hkeylen) 228148456Spjd{ 229148456Spjd u_char k_ipad[128], key[128]; 230148456Spjd SHA512_CTX lctx; 231148456Spjd u_int i; 232148456Spjd 233148456Spjd bzero(key, sizeof(key)); 234148456Spjd if (hkeylen == 0) 235148456Spjd ; /* do nothing */ 236148456Spjd else if (hkeylen <= 128) 237148456Spjd bcopy(hkey, key, hkeylen); 238148456Spjd else { 239148456Spjd /* If key is longer than 128 bytes reset it to key = SHA512(key). */ 240148456Spjd SHA512_Init(&lctx); 241148456Spjd SHA512_Update(&lctx, hkey, hkeylen); 242148456Spjd SHA512_Final(key, &lctx); 243148456Spjd } 244148456Spjd 245148456Spjd /* XOR key with ipad and opad values. */ 246148456Spjd for (i = 0; i < sizeof(key); i++) { 247148456Spjd k_ipad[i] = key[i] ^ 0x36; 248148456Spjd ctx->k_opad[i] = key[i] ^ 0x5c; 249148456Spjd } 250148456Spjd bzero(key, sizeof(key)); 251148456Spjd /* Perform inner SHA512. */ 252148456Spjd SHA512_Init(&ctx->shactx); 253148456Spjd SHA512_Update(&ctx->shactx, k_ipad, sizeof(k_ipad)); 254261618Sdelphij bzero(k_ipad, sizeof(k_ipad)); 255148456Spjd} 256148456Spjd 257148456Spjdvoid 258148456Spjdg_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data, 259148456Spjd size_t datasize) 260148456Spjd{ 261148456Spjd 262148456Spjd SHA512_Update(&ctx->shactx, data, datasize); 263148456Spjd} 264148456Spjd 265148456Spjdvoid 266148456Spjdg_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize) 267148456Spjd{ 268148456Spjd u_char digest[SHA512_MDLEN]; 269148456Spjd SHA512_CTX lctx; 270148456Spjd 271148456Spjd SHA512_Final(digest, &ctx->shactx); 272148456Spjd /* Perform outer SHA512. */ 273148456Spjd SHA512_Init(&lctx); 274148456Spjd SHA512_Update(&lctx, ctx->k_opad, sizeof(ctx->k_opad)); 275148456Spjd bzero(ctx, sizeof(*ctx)); 276148456Spjd SHA512_Update(&lctx, digest, sizeof(digest)); 277148456Spjd SHA512_Final(digest, &lctx); 278259429Spjd bzero(&lctx, sizeof(lctx)); 279148456Spjd /* mdsize == 0 means "Give me the whole hash!" */ 280148456Spjd if (mdsize == 0) 281148456Spjd mdsize = SHA512_MDLEN; 282148456Spjd bcopy(digest, md, mdsize); 283259429Spjd bzero(digest, sizeof(digest)); 284148456Spjd} 285148456Spjd 286148456Spjdvoid 287148456Spjdg_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize, const uint8_t *data, 288148456Spjd size_t datasize, uint8_t *md, size_t mdsize) 289148456Spjd{ 290148456Spjd struct hmac_ctx ctx; 291148456Spjd 292148456Spjd g_eli_crypto_hmac_init(&ctx, hkey, hkeysize); 293148456Spjd g_eli_crypto_hmac_update(&ctx, data, datasize); 294148456Spjd g_eli_crypto_hmac_final(&ctx, md, mdsize); 295148456Spjd} 296