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/* The purpose of these is to trap programs that attempt to use non FIPS 81 * algorithms in FIPS mode and ignore the errors. 82 */ 83 84static int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, 85 const unsigned char *iv, int enc) 86 { FIPS_ERROR_IGNORED("Cipher init"); return 0;} 87 88static int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 89 const unsigned char *in, unsigned int inl) 90 { FIPS_ERROR_IGNORED("Cipher update"); return 0;} 91 92/* NB: no cleanup because it is allowed after failed init */ 93 94static int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ) 95 { FIPS_ERROR_IGNORED("Cipher set_asn1"); return 0;} 96static int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ) 97 { FIPS_ERROR_IGNORED("Cipher get_asn1"); return 0;} 98static int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 99 { FIPS_ERROR_IGNORED("Cipher ctrl"); return 0;} 100 101static const EVP_CIPHER bad_cipher = 102 { 103 0, 104 0, 105 0, 106 0, 107 0, 108 bad_init, 109 bad_do_cipher, 110 NULL, 111 0, 112 bad_set_asn1, 113 bad_get_asn1, 114 bad_ctrl, 115 NULL 116 }; 117 118#endif 119 120#ifndef OPENSSL_NO_ENGINE 121 122#ifdef OPENSSL_FIPS 123 124static int do_engine_null(ENGINE *impl) { return 0;} 125static int do_evp_enc_engine_null(EVP_CIPHER_CTX *ctx, 126 const EVP_CIPHER **pciph, ENGINE *impl) 127 { return 1; } 128 129static int (*do_engine_finish)(ENGINE *impl) 130 = do_engine_null; 131 132static int (*do_evp_enc_engine) 133 (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl) 134 = do_evp_enc_engine_null; 135 136void int_EVP_CIPHER_set_engine_callbacks( 137 int (*eng_ciph_fin)(ENGINE *impl), 138 int (*eng_ciph_evp) 139 (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl)) 140 { 141 do_engine_finish = eng_ciph_fin; 142 do_evp_enc_engine = eng_ciph_evp; 143 } 144 145#else 146 147#define do_engine_finish ENGINE_finish 148 149static int do_evp_enc_engine(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl) 150 { 151 if(impl) 152 { 153 if (!ENGINE_init(impl)) 154 { 155 EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR); 156 return 0; 157 } 158 } 159 else 160 /* Ask if an ENGINE is reserved for this job */ 161 impl = ENGINE_get_cipher_engine((*pcipher)->nid); 162 if(impl) 163 { 164 /* There's an ENGINE for this job ... (apparently) */ 165 const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid); 166 if(!c) 167 { 168 /* One positive side-effect of US's export 169 * control history, is that we should at least 170 * be able to avoid using US mispellings of 171 * "initialisation"? */ 172 EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR); 173 return 0; 174 } 175 /* We'll use the ENGINE's private cipher definition */ 176 *pcipher = c; 177 /* Store the ENGINE functional reference so we know 178 * 'cipher' came from an ENGINE and we need to release 179 * it when done. */ 180 ctx->engine = impl; 181 } 182 else 183 ctx->engine = NULL; 184 return 1; 185 } 186 187#endif 188 189#endif 190 191int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, 192 const unsigned char *key, const unsigned char *iv, int enc) 193 { 194 if (enc == -1) 195 enc = ctx->encrypt; 196 else 197 { 198 if (enc) 199 enc = 1; 200 ctx->encrypt = enc; 201 } 202#ifdef OPENSSL_FIPS 203 if(FIPS_selftest_failed()) 204 { 205 FIPSerr(FIPS_F_EVP_CIPHERINIT_EX,FIPS_R_FIPS_SELFTEST_FAILED); 206 ctx->cipher = &bad_cipher; 207 return 0; 208 } 209#endif 210#ifndef OPENSSL_NO_ENGINE 211 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts 212 * so this context may already have an ENGINE! Try to avoid releasing 213 * the previous handle, re-querying for an ENGINE, and having a 214 * reinitialisation, when it may all be unecessary. */ 215 if (ctx->engine && ctx->cipher && (!cipher || 216 (cipher && (cipher->nid == ctx->cipher->nid)))) 217 goto skip_to_init; 218#endif 219 if (cipher) 220 { 221 /* Ensure a context left lying around from last time is cleared 222 * (the previous check attempted to avoid this if the same 223 * ENGINE and EVP_CIPHER could be used). */ 224 EVP_CIPHER_CTX_cleanup(ctx); 225 226 /* Restore encrypt field: it is zeroed by cleanup */ 227 ctx->encrypt = enc; 228#ifndef OPENSSL_NO_ENGINE 229 if (!do_evp_enc_engine(ctx, &cipher, impl)) 230 return 0; 231#endif 232 233 ctx->cipher=cipher; 234 if (ctx->cipher->ctx_size) 235 { 236 ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size); 237 if (!ctx->cipher_data) 238 { 239 EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); 240 return 0; 241 } 242 } 243 else 244 { 245 ctx->cipher_data = NULL; 246 } 247 ctx->key_len = cipher->key_len; 248 ctx->flags = 0; 249 if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) 250 { 251 if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) 252 { 253 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); 254 return 0; 255 } 256 } 257 } 258 else if(!ctx->cipher) 259 { 260 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); 261 return 0; 262 } 263#ifndef OPENSSL_NO_ENGINE 264skip_to_init: 265#endif 266 /* we assume block size is a power of 2 in *cryptUpdate */ 267 OPENSSL_assert(ctx->cipher->block_size == 1 268 || ctx->cipher->block_size == 8 269 || ctx->cipher->block_size == 16); 270 271 if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { 272 switch(EVP_CIPHER_CTX_mode(ctx)) { 273 274 case EVP_CIPH_STREAM_CIPHER: 275 case EVP_CIPH_ECB_MODE: 276 break; 277 278 case EVP_CIPH_CFB_MODE: 279 case EVP_CIPH_OFB_MODE: 280 281 ctx->num = 0; 282 /* fall-through */ 283 284 case EVP_CIPH_CBC_MODE: 285 286 OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= 287 (int)sizeof(ctx->iv)); 288 if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 289 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); 290 break; 291 292 default: 293 return 0; 294 break; 295 } 296 } 297 298#ifdef OPENSSL_FIPS 299 /* After 'key' is set no further parameters changes are permissible. 300 * So only check for non FIPS enabling at this point. 301 */ 302 if (key && FIPS_mode()) 303 { 304 if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS) 305 & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) 306 { 307 EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_DISABLED_FOR_FIPS); 308#if 0 309 ERR_add_error_data(2, "cipher=", 310 EVP_CIPHER_name(ctx->cipher)); 311#endif 312 ctx->cipher = &bad_cipher; 313 return 0; 314 } 315 } 316#endif 317 318 if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { 319 if(!ctx->cipher->init(ctx,key,iv,enc)) return 0; 320 } 321 ctx->buf_len=0; 322 ctx->final_used=0; 323 ctx->block_mask=ctx->cipher->block_size-1; 324 return 1; 325 } 326 327int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) 328 { 329 if (c->cipher != NULL) 330 { 331 if(c->cipher->cleanup && !c->cipher->cleanup(c)) 332 return 0; 333 /* Cleanse cipher context data */ 334 if (c->cipher_data) 335 OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); 336 } 337 if (c->cipher_data) 338 OPENSSL_free(c->cipher_data); 339#ifndef OPENSSL_NO_ENGINE 340 if (c->engine) 341 /* The EVP_CIPHER we used belongs to an ENGINE, release the 342 * functional reference we held for this reason. */ 343 do_engine_finish(c->engine); 344#endif 345 memset(c,0,sizeof(EVP_CIPHER_CTX)); 346 return 1; 347 } 348 349int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, unsigned int inl) 350 { 351#ifdef OPENSSL_FIPS 352 FIPS_selftest_check(); 353#endif 354 return ctx->cipher->do_cipher(ctx,out,in,inl); 355 } 356 357int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 358{ 359 int ret; 360 if(!ctx->cipher) { 361 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); 362 return 0; 363 } 364 365 if(!ctx->cipher->ctrl) { 366 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); 367 return 0; 368 } 369 370 ret = ctx->cipher->ctrl(ctx, type, arg, ptr); 371 if(ret == -1) { 372 EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); 373 return 0; 374 } 375 return ret; 376} 377 378unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx) 379 { 380 return ctx->cipher->flags; 381 } 382 383int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx) 384 { 385 return ctx->cipher->iv_len; 386 } 387 388int EVP_CIPHER_nid(const EVP_CIPHER *cipher) 389 { 390 return cipher->nid; 391 } 392