enc_min.c revision 296465
1/* crypto/evp/enc_min.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include <stdio.h> 60#include "cryptlib.h" 61#include <openssl/evp.h> 62#include <openssl/err.h> 63#include <openssl/rand.h> 64#ifndef OPENSSL_NO_ENGINE 65# include <openssl/engine.h> 66#endif 67#include "evp_locl.h" 68 69void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) 70{ 71#ifdef OPENSSL_FIPS 72 FIPS_selftest_check(); 73#endif 74 memset(ctx, 0, sizeof(EVP_CIPHER_CTX)); 75 /* ctx->cipher=NULL; */ 76} 77 78#ifdef OPENSSL_FIPS 79 80/* 81 * The purpose of these is to trap programs that attempt to use non FIPS 82 * algorithms in FIPS mode and ignore the errors. 83 */ 84 85static int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, 86 const unsigned char *iv, int enc) 87{ 88 FIPS_ERROR_IGNORED("Cipher init"); 89 return 0; 90} 91 92static int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 93 const unsigned char *in, unsigned int inl) 94{ 95 FIPS_ERROR_IGNORED("Cipher update"); 96 return 0; 97} 98 99/* NB: no cleanup because it is allowed after failed init */ 100 101static int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ) 102{ 103 FIPS_ERROR_IGNORED("Cipher set_asn1"); 104 return 0; 105} 106 107static int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ) 108{ 109 FIPS_ERROR_IGNORED("Cipher get_asn1"); 110 return 0; 111} 112 113static int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 114{ 115 FIPS_ERROR_IGNORED("Cipher ctrl"); 116 return 0; 117} 118 119static const EVP_CIPHER bad_cipher = { 120 0, 121 0, 122 0, 123 0, 124 0, 125 bad_init, 126 bad_do_cipher, 127 NULL, 128 0, 129 bad_set_asn1, 130 bad_get_asn1, 131 bad_ctrl, 132 NULL 133}; 134 135#endif 136 137#ifndef OPENSSL_NO_ENGINE 138 139# ifdef OPENSSL_FIPS 140 141static int do_engine_null(ENGINE *impl) 142{ 143 return 0; 144} 145 146static int do_evp_enc_engine_null(EVP_CIPHER_CTX *ctx, 147 const EVP_CIPHER **pciph, ENGINE *impl) 148{ 149 return 1; 150} 151 152static int (*do_engine_finish) (ENGINE *impl) 153 = do_engine_null; 154 155static int (*do_evp_enc_engine) 156 (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl) 157 = do_evp_enc_engine_null; 158 159void int_EVP_CIPHER_set_engine_callbacks(int (*eng_ciph_fin) (ENGINE *impl), 160 int (*eng_ciph_evp) 161 (EVP_CIPHER_CTX *ctx, 162 const EVP_CIPHER **pciph, 163 ENGINE *impl)) 164{ 165 do_engine_finish = eng_ciph_fin; 166 do_evp_enc_engine = eng_ciph_evp; 167} 168 169# else 170 171# define do_engine_finish ENGINE_finish 172 173static int do_evp_enc_engine(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, 174 ENGINE *impl) 175{ 176 if (impl) { 177 if (!ENGINE_init(impl)) { 178 EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR); 179 return 0; 180 } 181 } else 182 /* Ask if an ENGINE is reserved for this job */ 183 impl = ENGINE_get_cipher_engine((*pcipher)->nid); 184 if (impl) { 185 /* There's an ENGINE for this job ... (apparently) */ 186 const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid); 187 if (!c) { 188 /* 189 * One positive side-effect of US's export control history, is 190 * that we should at least be able to avoid using US mispellings 191 * of "initialisation"? 192 */ 193 EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR); 194 return 0; 195 } 196 /* We'll use the ENGINE's private cipher definition */ 197 *pcipher = c; 198 /* 199 * Store the ENGINE functional reference so we know 'cipher' came 200 * from an ENGINE and we need to release it when done. 201 */ 202 ctx->engine = impl; 203 } else 204 ctx->engine = NULL; 205 return 1; 206} 207 208# endif 209 210#endif 211 212int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 213 ENGINE *impl, const unsigned char *key, 214 const unsigned char *iv, int enc) 215{ 216 if (enc == -1) 217 enc = ctx->encrypt; 218 else { 219 if (enc) 220 enc = 1; 221 ctx->encrypt = enc; 222 } 223#ifdef OPENSSL_FIPS 224 if (FIPS_selftest_failed()) { 225 FIPSerr(FIPS_F_EVP_CIPHERINIT_EX, FIPS_R_FIPS_SELFTEST_FAILED); 226 ctx->cipher = &bad_cipher; 227 return 0; 228 } 229#endif 230#ifndef OPENSSL_NO_ENGINE 231 /* 232 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so 233 * this context may already have an ENGINE! Try to avoid releasing the 234 * previous handle, re-querying for an ENGINE, and having a 235 * reinitialisation, when it may all be unecessary. 236 */ 237 if (ctx->engine && ctx->cipher && (!cipher || 238 (cipher 239 && (cipher->nid == 240 ctx->cipher->nid)))) 241 goto skip_to_init; 242#endif 243 if (cipher) { 244 /* 245 * Ensure a context left lying around from last time is cleared (the 246 * previous check attempted to avoid this if the same ENGINE and 247 * EVP_CIPHER could be used). 248 */ 249 EVP_CIPHER_CTX_cleanup(ctx); 250 251 /* Restore encrypt field: it is zeroed by cleanup */ 252 ctx->encrypt = enc; 253#ifndef OPENSSL_NO_ENGINE 254 if (!do_evp_enc_engine(ctx, &cipher, impl)) 255 return 0; 256#endif 257 258 ctx->cipher = cipher; 259 if (ctx->cipher->ctx_size) { 260 ctx->cipher_data = OPENSSL_malloc(ctx->cipher->ctx_size); 261 if (!ctx->cipher_data) { 262 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); 263 return 0; 264 } 265 } else { 266 ctx->cipher_data = NULL; 267 } 268 ctx->key_len = cipher->key_len; 269 ctx->flags = 0; 270 if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { 271 if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { 272 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 273 return 0; 274 } 275 } 276 } else if (!ctx->cipher) { 277 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); 278 return 0; 279 } 280#ifndef OPENSSL_NO_ENGINE 281 skip_to_init: 282#endif 283 /* we assume block size is a power of 2 in *cryptUpdate */ 284 OPENSSL_assert(ctx->cipher->block_size == 1 285 || ctx->cipher->block_size == 8 286 || ctx->cipher->block_size == 16); 287 288 if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { 289 switch (EVP_CIPHER_CTX_mode(ctx)) { 290 291 case EVP_CIPH_STREAM_CIPHER: 292 case EVP_CIPH_ECB_MODE: 293 break; 294 295 case EVP_CIPH_CFB_MODE: 296 case EVP_CIPH_OFB_MODE: 297 298 ctx->num = 0; 299 /* fall-through */ 300 301 case EVP_CIPH_CBC_MODE: 302 303 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= 304 (int)sizeof(ctx->iv)); 305 if (iv) 306 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 307 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); 308 break; 309 310 default: 311 return 0; 312 break; 313 } 314 } 315#ifdef OPENSSL_FIPS 316 /* 317 * After 'key' is set no further parameters changes are permissible. So 318 * only check for non FIPS enabling at this point. 319 */ 320 if (key && FIPS_mode()) { 321 if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS) 322 & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) { 323 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_DISABLED_FOR_FIPS); 324# if 0 325 ERR_add_error_data(2, "cipher=", EVP_CIPHER_name(ctx->cipher)); 326# endif 327 ctx->cipher = &bad_cipher; 328 return 0; 329 } 330 } 331#endif 332 333 if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { 334 if (!ctx->cipher->init(ctx, key, iv, enc)) 335 return 0; 336 } 337 ctx->buf_len = 0; 338 ctx->final_used = 0; 339 ctx->block_mask = ctx->cipher->block_size - 1; 340 return 1; 341} 342 343int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) 344{ 345 if (c->cipher != NULL) { 346 if (c->cipher->cleanup && !c->cipher->cleanup(c)) 347 return 0; 348 /* Cleanse cipher context data */ 349 if (c->cipher_data) 350 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); 351 } 352 if (c->cipher_data) 353 OPENSSL_free(c->cipher_data); 354#ifndef OPENSSL_NO_ENGINE 355 if (c->engine) 356 /* 357 * The EVP_CIPHER we used belongs to an ENGINE, release the 358 * functional reference we held for this reason. 359 */ 360 do_engine_finish(c->engine); 361#endif 362 memset(c, 0, sizeof(EVP_CIPHER_CTX)); 363 return 1; 364} 365 366int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 367 const unsigned char *in, unsigned int inl) 368{ 369#ifdef OPENSSL_FIPS 370 FIPS_selftest_check(); 371#endif 372 return ctx->cipher->do_cipher(ctx, out, in, inl); 373} 374 375int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 376{ 377 int ret; 378 if (!ctx->cipher) { 379 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); 380 return 0; 381 } 382 383 if (!ctx->cipher->ctrl) { 384 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); 385 return 0; 386 } 387 388 ret = ctx->cipher->ctrl(ctx, type, arg, ptr); 389 if (ret == -1) { 390 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, 391 EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); 392 return 0; 393 } 394 return ret; 395} 396 397unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx) 398{ 399 return ctx->cipher->flags; 400} 401 402int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx) 403{ 404 return ctx->cipher->iv_len; 405} 406 407int EVP_CIPHER_nid(const EVP_CIPHER *cipher) 408{ 409 return cipher->nid; 410} 411