evp_enc.c revision 194206
155714Skris/* crypto/evp/evp_enc.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 855714Skris * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1555714Skris * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 2255714Skris * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 3755714Skris * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4055714Skris * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 5255714Skris * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <stdio.h> 6055714Skris#include "cryptlib.h" 6155714Skris#include <openssl/evp.h> 6268651Skris#include <openssl/err.h> 63160814Ssimon#include <openssl/rand.h> 64111147Snectar#ifndef OPENSSL_NO_ENGINE 65109998Smarkm#include <openssl/engine.h> 66111147Snectar#endif 6768651Skris#include "evp_locl.h" 6855714Skris 69194206Ssimon#ifdef OPENSSL_FIPS 70194206Ssimon #define M_do_cipher(ctx, out, in, inl) \ 71194206Ssimon EVP_Cipher(ctx,out,in,inl) 72194206Ssimon#else 73194206Ssimon #define M_do_cipher(ctx, out, in, inl) \ 74194206Ssimon ctx->cipher->do_cipher(ctx,out,in,inl) 75194206Ssimon#endif 76194206Ssimon 77167612Ssimonconst char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT; 7855714Skris 79160814SsimonEVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) 80160814Ssimon { 81160814Ssimon EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx); 82160814Ssimon if (ctx) 83160814Ssimon EVP_CIPHER_CTX_init(ctx); 84160814Ssimon return ctx; 85160814Ssimon } 86109998Smarkm 8768651Skrisint EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 88109998Smarkm const unsigned char *key, const unsigned char *iv, int enc) 8955714Skris { 90109998Smarkm if (cipher) 91109998Smarkm EVP_CIPHER_CTX_init(ctx); 92109998Smarkm return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc); 93109998Smarkm } 94109998Smarkm 9568651Skrisint EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 96109998Smarkm const unsigned char *in, int inl) 9755714Skris { 9855714Skris if (ctx->encrypt) 9968651Skris return EVP_EncryptUpdate(ctx,out,outl,in,inl); 10068651Skris else return EVP_DecryptUpdate(ctx,out,outl,in,inl); 10155714Skris } 10255714Skris 103109998Smarkmint EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 104109998Smarkm { 105109998Smarkm if (ctx->encrypt) 106109998Smarkm return EVP_EncryptFinal_ex(ctx,out,outl); 107109998Smarkm else return EVP_DecryptFinal_ex(ctx,out,outl); 108109998Smarkm } 109109998Smarkm 11055714Skrisint EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 11155714Skris { 11255714Skris if (ctx->encrypt) 11368651Skris return EVP_EncryptFinal(ctx,out,outl); 114109998Smarkm else return EVP_DecryptFinal(ctx,out,outl); 11555714Skris } 11655714Skris 11768651Skrisint EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 118109998Smarkm const unsigned char *key, const unsigned char *iv) 11955714Skris { 12068651Skris return EVP_CipherInit(ctx, cipher, key, iv, 1); 12155714Skris } 12255714Skris 123109998Smarkmint EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl, 124109998Smarkm const unsigned char *key, const unsigned char *iv) 125109998Smarkm { 126109998Smarkm return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); 127109998Smarkm } 128109998Smarkm 12968651Skrisint EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, 130109998Smarkm const unsigned char *key, const unsigned char *iv) 13155714Skris { 132111147Snectar return EVP_CipherInit(ctx, cipher, key, iv, 0); 13355714Skris } 13455714Skris 135109998Smarkmint EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, 136109998Smarkm const unsigned char *key, const unsigned char *iv) 137109998Smarkm { 138109998Smarkm return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); 139109998Smarkm } 14055714Skris 14168651Skrisint EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 142109998Smarkm const unsigned char *in, int inl) 14355714Skris { 14455714Skris int i,j,bl; 14555714Skris 146194206Ssimon if (inl <= 0) 147194206Ssimon { 148194206Ssimon *outl = 0; 149194206Ssimon return inl == 0; 150194206Ssimon } 151194206Ssimon 152109998Smarkm if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0) 153109998Smarkm { 154194206Ssimon if(M_do_cipher(ctx,out,in,inl)) 155109998Smarkm { 156109998Smarkm *outl=inl; 157109998Smarkm return 1; 158109998Smarkm } 159109998Smarkm else 160109998Smarkm { 161109998Smarkm *outl=0; 162109998Smarkm return 0; 163109998Smarkm } 164109998Smarkm } 16555714Skris i=ctx->buf_len; 16655714Skris bl=ctx->cipher->block_size; 167160814Ssimon OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); 16855714Skris if (i != 0) 16955714Skris { 17055714Skris if (i+inl < bl) 17155714Skris { 17255714Skris memcpy(&(ctx->buf[i]),in,inl); 17355714Skris ctx->buf_len+=inl; 174109998Smarkm *outl=0; 17568651Skris return 1; 17655714Skris } 17755714Skris else 17855714Skris { 17955714Skris j=bl-i; 180109998Smarkm memcpy(&(ctx->buf[i]),in,j); 181194206Ssimon if(!M_do_cipher(ctx,out,ctx->buf,bl)) return 0; 18255714Skris inl-=j; 18355714Skris in+=j; 18455714Skris out+=bl; 185109998Smarkm *outl=bl; 18655714Skris } 18755714Skris } 188109998Smarkm else 189109998Smarkm *outl = 0; 190109998Smarkm i=inl&(bl-1); 19155714Skris inl-=i; 19255714Skris if (inl > 0) 19355714Skris { 194194206Ssimon if(!M_do_cipher(ctx,out,in,inl)) return 0; 19555714Skris *outl+=inl; 19655714Skris } 19755714Skris 19855714Skris if (i != 0) 19955714Skris memcpy(ctx->buf,&(in[inl]),i); 20055714Skris ctx->buf_len=i; 20168651Skris return 1; 20255714Skris } 20355714Skris 20468651Skrisint EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 20555714Skris { 206109998Smarkm int ret; 207109998Smarkm ret = EVP_EncryptFinal_ex(ctx, out, outl); 208109998Smarkm return ret; 209109998Smarkm } 21055714Skris 211109998Smarkmint EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 212109998Smarkm { 213160814Ssimon int n,ret; 214160814Ssimon unsigned int i, b, bl; 215109998Smarkm 21655714Skris b=ctx->cipher->block_size; 217109998Smarkm OPENSSL_assert(b <= sizeof ctx->buf); 21855714Skris if (b == 1) 21955714Skris { 22055714Skris *outl=0; 22168651Skris return 1; 22255714Skris } 22355714Skris bl=ctx->buf_len; 224109998Smarkm if (ctx->flags & EVP_CIPH_NO_PADDING) 225109998Smarkm { 226109998Smarkm if(bl) 227109998Smarkm { 228160814Ssimon EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 229109998Smarkm return 0; 230109998Smarkm } 231109998Smarkm *outl = 0; 232109998Smarkm return 1; 233109998Smarkm } 234109998Smarkm 23555714Skris n=b-bl; 23655714Skris for (i=bl; i<b; i++) 23755714Skris ctx->buf[i]=n; 238194206Ssimon ret=M_do_cipher(ctx,out,ctx->buf,b); 239109998Smarkm 240109998Smarkm 241109998Smarkm if(ret) 242109998Smarkm *outl=b; 243109998Smarkm 244109998Smarkm return ret; 24555714Skris } 24655714Skris 24768651Skrisint EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, 248109998Smarkm const unsigned char *in, int inl) 24955714Skris { 250160814Ssimon int fix_len; 251160814Ssimon unsigned int b; 25255714Skris 253194206Ssimon if (inl <= 0) 254109998Smarkm { 255194206Ssimon *outl = 0; 256194206Ssimon return inl == 0; 257109998Smarkm } 25855714Skris 259109998Smarkm if (ctx->flags & EVP_CIPH_NO_PADDING) 260109998Smarkm return EVP_EncryptUpdate(ctx, out, outl, in, inl); 261109998Smarkm 26255714Skris b=ctx->cipher->block_size; 263109998Smarkm OPENSSL_assert(b <= sizeof ctx->final); 264109998Smarkm 265109998Smarkm if(ctx->final_used) 26655714Skris { 267109998Smarkm memcpy(out,ctx->final,b); 268109998Smarkm out+=b; 269109998Smarkm fix_len = 1; 27055714Skris } 271109998Smarkm else 272109998Smarkm fix_len = 0; 27355714Skris 274109998Smarkm 275109998Smarkm if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) 276109998Smarkm return 0; 277109998Smarkm 27855714Skris /* if we have 'decrypted' a multiple of block size, make sure 27955714Skris * we have a copy of this last block */ 280109998Smarkm if (b > 1 && !ctx->buf_len) 28155714Skris { 282109998Smarkm *outl-=b; 283109998Smarkm ctx->final_used=1; 284109998Smarkm memcpy(ctx->final,&out[*outl],b); 28555714Skris } 286109998Smarkm else 287109998Smarkm ctx->final_used = 0; 288109998Smarkm 289109998Smarkm if (fix_len) 290109998Smarkm *outl += b; 291109998Smarkm 29268651Skris return 1; 29355714Skris } 29455714Skris 29555714Skrisint EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 29655714Skris { 297109998Smarkm int ret; 298109998Smarkm ret = EVP_DecryptFinal_ex(ctx, out, outl); 299109998Smarkm return ret; 300109998Smarkm } 301109998Smarkm 302109998Smarkmint EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) 303109998Smarkm { 304160814Ssimon int i,n; 305160814Ssimon unsigned int b; 30655714Skris 30755714Skris *outl=0; 30855714Skris b=ctx->cipher->block_size; 309109998Smarkm if (ctx->flags & EVP_CIPH_NO_PADDING) 310109998Smarkm { 311109998Smarkm if(ctx->buf_len) 312109998Smarkm { 313160814Ssimon EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); 314109998Smarkm return 0; 315109998Smarkm } 316109998Smarkm *outl = 0; 317109998Smarkm return 1; 318109998Smarkm } 31955714Skris if (b > 1) 32055714Skris { 321109998Smarkm if (ctx->buf_len || !ctx->final_used) 32255714Skris { 323160814Ssimon EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH); 32455714Skris return(0); 32555714Skris } 326109998Smarkm OPENSSL_assert(b <= sizeof ctx->final); 327109998Smarkm n=ctx->final[b-1]; 328160814Ssimon if (n == 0 || n > (int)b) 32955714Skris { 330160814Ssimon EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT); 33155714Skris return(0); 33255714Skris } 33355714Skris for (i=0; i<n; i++) 33455714Skris { 335109998Smarkm if (ctx->final[--b] != n) 33655714Skris { 337160814Ssimon EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT); 33855714Skris return(0); 33955714Skris } 34055714Skris } 34155714Skris n=ctx->cipher->block_size-n; 34255714Skris for (i=0; i<n; i++) 343109998Smarkm out[i]=ctx->final[i]; 34455714Skris *outl=n; 34555714Skris } 34655714Skris else 34755714Skris *outl=0; 34855714Skris return(1); 34955714Skris } 35055714Skris 351160814Ssimonvoid EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) 352160814Ssimon { 353160814Ssimon if (ctx) 354160814Ssimon { 355160814Ssimon EVP_CIPHER_CTX_cleanup(ctx); 356160814Ssimon OPENSSL_free(ctx); 357160814Ssimon } 358160814Ssimon } 359160814Ssimon 36068651Skrisint EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) 36168651Skris { 36268651Skris if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) 36368651Skris return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); 36468651Skris if(c->key_len == keylen) return 1; 36568651Skris if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) 36668651Skris { 36768651Skris c->key_len = keylen; 36868651Skris return 1; 36968651Skris } 37068651Skris EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH); 37168651Skris return 0; 37268651Skris } 37368651Skris 374109998Smarkmint EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) 375109998Smarkm { 376109998Smarkm if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING; 377109998Smarkm else ctx->flags |= EVP_CIPH_NO_PADDING; 378109998Smarkm return 1; 379109998Smarkm } 380109998Smarkm 381160814Ssimonint EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) 382160814Ssimon { 383160814Ssimon if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) 384160814Ssimon return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); 385160814Ssimon if (RAND_bytes(key, ctx->key_len) <= 0) 386160814Ssimon return 0; 387160814Ssimon return 1; 388160814Ssimon } 389160814Ssimon 390194206Ssimon#ifndef OPENSSL_NO_ENGINE 391194206Ssimon 392194206Ssimon#ifdef OPENSSL_FIPS 393194206Ssimon 394194206Ssimonstatic int do_evp_enc_engine_full(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl) 395194206Ssimon { 396194206Ssimon if(impl) 397194206Ssimon { 398194206Ssimon if (!ENGINE_init(impl)) 399194206Ssimon { 400194206Ssimon EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR); 401194206Ssimon return 0; 402194206Ssimon } 403194206Ssimon } 404194206Ssimon else 405194206Ssimon /* Ask if an ENGINE is reserved for this job */ 406194206Ssimon impl = ENGINE_get_cipher_engine((*pcipher)->nid); 407194206Ssimon if(impl) 408194206Ssimon { 409194206Ssimon /* There's an ENGINE for this job ... (apparently) */ 410194206Ssimon const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid); 411194206Ssimon if(!c) 412194206Ssimon { 413194206Ssimon /* One positive side-effect of US's export 414194206Ssimon * control history, is that we should at least 415194206Ssimon * be able to avoid using US mispellings of 416194206Ssimon * "initialisation"? */ 417194206Ssimon EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR); 418194206Ssimon return 0; 419194206Ssimon } 420194206Ssimon /* We'll use the ENGINE's private cipher definition */ 421194206Ssimon *pcipher = c; 422194206Ssimon /* Store the ENGINE functional reference so we know 423194206Ssimon * 'cipher' came from an ENGINE and we need to release 424194206Ssimon * it when done. */ 425194206Ssimon ctx->engine = impl; 426194206Ssimon } 427194206Ssimon else 428194206Ssimon ctx->engine = NULL; 429194206Ssimon return 1; 430194206Ssimon } 431194206Ssimon 432194206Ssimonvoid int_EVP_CIPHER_init_engine_callbacks(void) 433194206Ssimon { 434194206Ssimon int_EVP_CIPHER_set_engine_callbacks( 435194206Ssimon ENGINE_finish, do_evp_enc_engine_full); 436194206Ssimon } 437194206Ssimon 438194206Ssimon#endif 439194206Ssimon 440194206Ssimon#endif 441