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| 1 /* crypto/evp/bio_enc.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 <errno.h> | |
| 61 #include "cryptlib.h" | |
| 62 #include <openssl/buffer.h> | |
| 63 #include <openssl/evp.h> | |
| 64 | |
| 65 static int enc_write(BIO *h, const char *buf, int num); | |
| 66 static int enc_read(BIO *h, char *buf, int size); | |
| 67 /*static int enc_puts(BIO *h, const char *str); */ | |
| 68 /*static int enc_gets(BIO *h, char *str, int size); */ | |
| 69 static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2); | |
| 70 static int enc_new(BIO *h); | |
| 71 static int enc_free(BIO *data); | |
| 72 static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps); | |
| 73 #define ENC_BLOCK_SIZE (1024*4) | |
| 74 #define BUF_OFFSET (EVP_MAX_BLOCK_LENGTH*2) | |
| 75 | |
| 76 typedef struct enc_struct | |
| 77 { | |
| 78 int buf_len; | |
| 79 int buf_off; | |
| 80 int cont; /* <= 0 when finished */ | |
| 81 int finished; | |
| 82 int ok; /* bad decrypt */ | |
| 83 EVP_CIPHER_CTX cipher; | |
| 84 /* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate | |
| 85 * can return up to a block more data than is presented to it | |
| 86 */ | |
| 87 char buf[ENC_BLOCK_SIZE+BUF_OFFSET+2]; | |
| 88 } BIO_ENC_CTX; | |
| 89 | |
| 90 static BIO_METHOD methods_enc= | |
| 91 { | |
| 92 BIO_TYPE_CIPHER,"cipher", | |
| 93 enc_write, | |
| 94 enc_read, | |
| 95 NULL, /* enc_puts, */ | |
| 96 NULL, /* enc_gets, */ | |
| 97 enc_ctrl, | |
| 98 enc_new, | |
| 99 enc_free, | |
| 100 enc_callback_ctrl, | |
| 101 }; | |
| 102 | |
| 103 BIO_METHOD *BIO_f_cipher(void) | |
| 104 { | |
| 105 return(&methods_enc); | |
| 106 } | |
| 107 | |
| 108 static int enc_new(BIO *bi) | |
| 109 { | |
| 110 BIO_ENC_CTX *ctx; | |
| 111 | |
| 112 ctx=(BIO_ENC_CTX *)OPENSSL_malloc(sizeof(BIO_ENC_CTX)); | |
| 113 if (ctx == NULL) return(0); | |
| 114 EVP_CIPHER_CTX_init(&ctx->cipher); | |
| 115 | |
| 116 ctx->buf_len=0; | |
| 117 ctx->buf_off=0; | |
| 118 ctx->cont=1; | |
| 119 ctx->finished=0; | |
| 120 ctx->ok=1; | |
| 121 | |
| 122 bi->init=0; | |
| 123 bi->ptr=(char *)ctx; | |
| 124 bi->flags=0; | |
| 125 return(1); | |
| 126 } | |
| 127 | |
| 128 static int enc_free(BIO *a) | |
| 129 { | |
| 130 BIO_ENC_CTX *b; | |
| 131 | |
| 132 if (a == NULL) return(0); | |
| 133 b=(BIO_ENC_CTX *)a->ptr; | |
| 134 EVP_CIPHER_CTX_cleanup(&(b->cipher)); | |
| 135 OPENSSL_cleanse(a->ptr,sizeof(BIO_ENC_CTX)); | |
| 136 OPENSSL_free(a->ptr); | |
| 137 a->ptr=NULL; | |
| 138 a->init=0; | |
| 139 a->flags=0; | |
| 140 return(1); | |
| 141 } | |
| 142 | |
| 143 static int enc_read(BIO *b, char *out, int outl) | |
| 144 { | |
| 145 int ret=0,i; | |
| 146 BIO_ENC_CTX *ctx; | |
| 147 | |
| 148 if (out == NULL) return(0); | |
| 149 ctx=(BIO_ENC_CTX *)b->ptr; | |
| 150 | |
| 151 if ((ctx == NULL) || (b->next_bio == NULL)) return(0); | |
| 152 | |
| 153 /* First check if there are bytes decoded/encoded */ | |
| 154 if (ctx->buf_len > 0) | |
| 155 { | |
| 156 i=ctx->buf_len-ctx->buf_off; | |
| 157 if (i > outl) i=outl; | |
| 158 memcpy(out,&(ctx->buf[ctx->buf_off]),i); | |
| 159 ret=i; | |
| 160 out+=i; | |
| 161 outl-=i; | |
| 162 ctx->buf_off+=i; | |
| 163 if (ctx->buf_len == ctx->buf_off) | |
| 164 { | |
| 165 ctx->buf_len=0; | |
| 166 ctx->buf_off=0; | |
| 167 } | |
| 168 } | |
| 169 | |
| 170 /* At this point, we have room of outl bytes and an empty | |
| 171 * buffer, so we should read in some more. */ | |
| 172 | |
| 173 while (outl > 0) | |
| 174 { | |
| 175 if (ctx->cont <= 0) break; | |
| 176 | |
| 177 /* read in at IV offset, read the EVP_Cipher | |
| 178 * documentation about why */ | |
| 179 i=BIO_read(b->next_bio,&(ctx->buf[BUF_OFFSET]),ENC_BLOCK_SIZE); | |
| 180 | |
| 181 if (i <= 0) | |
| 182 { | |
| 183 /* Should be continue next time we are called? */ | |
| 184 if (!BIO_should_retry(b->next_bio)) | |
| 185 { | |
| 186 ctx->cont=i; | |
| 187 i=EVP_CipherFinal_ex(&(ctx->cipher), | |
| 188 (unsigned char *)ctx->buf, | |
| 189 &(ctx->buf_len)); | |
| 190 ctx->ok=i; | |
| 191 ctx->buf_off=0; | |
| 192 } | |
| 193 else | |
| 194 { | |
| 195 ret=(ret == 0)?i:ret; | |
| 196 break; | |
| 197 } | |
| 198 } | |
| 199 else | |
| 200 { | |
| 201 EVP_CipherUpdate(&(ctx->cipher), | |
| 202 (unsigned char *)ctx->buf,&ctx->buf_len, | |
| 203 (unsigned char *)&(ctx->buf[BUF_OFFSET]),i); | |
| 204 ctx->cont=1; | |
| 205 /* Note: it is possible for EVP_CipherUpdate to | |
| 206 * decrypt zero bytes because this is or looks like | |
| 207 * the final block: if this happens we should retry | |
| 208 * and either read more data or decrypt the final | |
| 209 * block | |
| 210 */ | |
| 211 if(ctx->buf_len == 0) continue; | |
| 212 } | |
| 213 | |
| 214 if (ctx->buf_len <= outl) | |
| 215 i=ctx->buf_len; | |
| 216 else | |
| 217 i=outl; | |
| 218 if (i <= 0) break; | |
| 219 memcpy(out,ctx->buf,i); | |
| 220 ret+=i; | |
| 221 ctx->buf_off=i; | |
| 222 outl-=i; | |
| 223 out+=i; | |
| 224 } | |
| 225 | |
| 226 BIO_clear_retry_flags(b); | |
| 227 BIO_copy_next_retry(b); | |
| 228 return((ret == 0)?ctx->cont:ret); | |
| 229 } | |
| 230 | |
| 231 static int enc_write(BIO *b, const char *in, int inl) | |
| 232 { | |
| 233 int ret=0,n,i; | |
| 234 BIO_ENC_CTX *ctx; | |
| 235 | |
| 236 ctx=(BIO_ENC_CTX *)b->ptr; | |
| 237 ret=inl; | |
| 238 | |
| 239 BIO_clear_retry_flags(b); | |
| 240 n=ctx->buf_len-ctx->buf_off; | |
| 241 while (n > 0) | |
| 242 { | |
| 243 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n); | |
| 244 if (i <= 0) | |
| 245 { | |
| 246 BIO_copy_next_retry(b); | |
| 247 return(i); | |
| 248 } | |
| 249 ctx->buf_off+=i; | |
| 250 n-=i; | |
| 251 } | |
| 252 /* at this point all pending data has been written */ | |
| 253 | |
| 254 if ((in == NULL) || (inl <= 0)) return(0); | |
| 255 | |
| 256 ctx->buf_off=0; | |
| 257 while (inl > 0) | |
| 258 { | |
| 259 n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl; | |
| 260 EVP_CipherUpdate(&(ctx->cipher), | |
| 261 (unsigned char *)ctx->buf,&ctx->buf_len, | |
| 262 (unsigned char *)in,n); | |
| 263 inl-=n; | |
| 264 in+=n; | |
| 265 | |
| 266 ctx->buf_off=0; | |
| 267 n=ctx->buf_len; | |
| 268 while (n > 0) | |
| 269 { | |
| 270 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n); | |
| 271 if (i <= 0) | |
| 272 { | |
| 273 BIO_copy_next_retry(b); | |
| 274 return (ret == inl) ? i : ret - inl; | |
| 275 } | |
| 276 n-=i; | |
| 277 ctx->buf_off+=i; | |
| 278 } | |
| 279 ctx->buf_len=0; | |
| 280 ctx->buf_off=0; | |
| 281 } | |
| 282 BIO_copy_next_retry(b); | |
| 283 return(ret); | |
| 284 } | |
| 285 | |
| 286 static long enc_ctrl(BIO *b, int cmd, long num, void *ptr) | |
| 287 { | |
| 288 BIO *dbio; | |
| 289 BIO_ENC_CTX *ctx,*dctx; | |
| 290 long ret=1; | |
| 291 int i; | |
| 292 EVP_CIPHER_CTX **c_ctx; | |
| 293 | |
| 294 ctx=(BIO_ENC_CTX *)b->ptr; | |
| 295 | |
| 296 switch (cmd) | |
| 297 { | |
| 298 case BIO_CTRL_RESET: | |
| 299 ctx->ok=1; | |
| 300 ctx->finished=0; | |
| 301 EVP_CipherInit_ex(&(ctx->cipher),NULL,NULL,NULL,NULL, | |
| 302 ctx->cipher.encrypt); | |
| 303 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
| 304 break; | |
| 305 case BIO_CTRL_EOF: /* More to read */ | |
| 306 if (ctx->cont <= 0) | |
| 307 ret=1; | |
| 308 else | |
| 309 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
| 310 break; | |
| 311 case BIO_CTRL_WPENDING: | |
| 312 ret=ctx->buf_len-ctx->buf_off; | |
| 313 if (ret <= 0) | |
| 314 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
| 315 break; | |
| 316 case BIO_CTRL_PENDING: /* More to read in buffer */ | |
| 317 ret=ctx->buf_len-ctx->buf_off; | |
| 318 if (ret <= 0) | |
| 319 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
| 320 break; | |
| 321 case BIO_CTRL_FLUSH: | |
| 322 /* do a final write */ | |
| 323 again: | |
| 324 while (ctx->buf_len != ctx->buf_off) | |
| 325 { | |
| 326 i=enc_write(b,NULL,0); | |
| 327 if (i < 0) | |
| 328 return i; | |
| 329 } | |
| 330 | |
| 331 if (!ctx->finished) | |
| 332 { | |
| 333 ctx->finished=1; | |
| 334 ctx->buf_off=0; | |
| 335 ret=EVP_CipherFinal_ex(&(ctx->cipher), | |
| 336 (unsigned char *)ctx->buf, | |
| 337 &(ctx->buf_len)); | |
| 338 ctx->ok=(int)ret; | |
| 339 if (ret <= 0) break; | |
| 340 | |
| 341 /* push out the bytes */ | |
| 342 goto again; | |
| 343 } | |
| 344 | |
| 345 /* Finally flush the underlying BIO */ | |
| 346 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
| 347 break; | |
| 348 case BIO_C_GET_CIPHER_STATUS: | |
| 349 ret=(long)ctx->ok; | |
| 350 break; | |
| 351 case BIO_C_DO_STATE_MACHINE: | |
| 352 BIO_clear_retry_flags(b); | |
| 353 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
| 354 BIO_copy_next_retry(b); | |
| 355 break; | |
| 356 case BIO_C_GET_CIPHER_CTX: | |
| 357 c_ctx=(EVP_CIPHER_CTX **)ptr; | |
| 358 (*c_ctx)= &(ctx->cipher); | |
| 359 b->init=1; | |
| 360 break; | |
| 361 case BIO_CTRL_DUP: | |
| 362 dbio=(BIO *)ptr; | |
| 363 dctx=(BIO_ENC_CTX *)dbio->ptr; | |
| 364 EVP_CIPHER_CTX_init(&dctx->cipher); | |
| 365 ret = EVP_CIPHER_CTX_copy(&dctx->cipher,&ctx->cipher); | |
| 366 if (ret) | |
| 367 dbio->init=1; | |
| 368 break; | |
| 369 default: | |
| 370 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); | |
| 371 break; | |
| 372 } | |
| 373 return(ret); | |
| 374 } | |
| 375 | |
| 376 static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) | |
| 377 { | |
| 378 long ret=1; | |
| 379 | |
| 380 if (b->next_bio == NULL) return(0); | |
| 381 switch (cmd) | |
| 382 { | |
| 383 default: | |
| 384 ret=BIO_callback_ctrl(b->next_bio,cmd,fp); | |
| 385 break; | |
| 386 } | |
| 387 return(ret); | |
| 388 } | |
| 389 | |
| 390 /* | |
| 391 void BIO_set_cipher_ctx(b,c) | |
| 392 BIO *b; | |
| 393 EVP_CIPHER_ctx *c; | |
| 394 { | |
| 395 if (b == NULL) return; | |
| 396 | |
| 397 if ((b->callback != NULL) && | |
| 398 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0)) | |
| 399 return; | |
| 400 | |
| 401 b->init=1; | |
| 402 ctx=(BIO_ENC_CTX *)b->ptr; | |
| 403 memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX)); | |
| 404 | |
| 405 if (b->callback != NULL) | |
| 406 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L); | |
| 407 } | |
| 408 */ | |
| 409 | |
| 410 void BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k, | |
| 411 const unsigned char *i, int e) | |
| 412 { | |
| 413 BIO_ENC_CTX *ctx; | |
| 414 | |
| 415 if (b == NULL) return; | |
| 416 | |
| 417 if ((b->callback != NULL) && | |
| 418 (b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,0L) <=
0)) | |
| 419 return; | |
| 420 | |
| 421 b->init=1; | |
| 422 ctx=(BIO_ENC_CTX *)b->ptr; | |
| 423 EVP_CipherInit_ex(&(ctx->cipher),c,NULL, k,i,e); | |
| 424 | |
| 425 if (b->callback != NULL) | |
| 426 b->callback(b,BIO_CB_CTRL,(const char *)c,BIO_CTRL_SET,e,1L); | |
| 427 } | |
| 428 | |
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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master