1998-12-21 10:52:47 +00:00
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/* crypto/evp/evp_enc.c */
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1998-12-21 10:56:39 +00:00
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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1998-12-21 10:52:47 +00:00
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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1999-04-23 22:13:45 +00:00
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#include <openssl/evp.h>
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2000-05-26 23:51:35 +00:00
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#include <openssl/err.h>
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2004-04-19 17:46:04 +00:00
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#include <openssl/rand.h>
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2003-01-30 17:39:26 +00:00
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#ifndef OPENSSL_NO_ENGINE
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2001-09-25 21:37:02 +00:00
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#include <openssl/engine.h>
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2003-01-30 17:39:26 +00:00
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#endif
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2014-09-05 12:47:33 +00:00
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#include "../constant_time_locl.h"
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2000-05-30 02:10:57 +00:00
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#include "evp_locl.h"
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1998-12-21 10:52:47 +00:00
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2008-09-15 22:21:42 +00:00
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#ifdef OPENSSL_FIPS
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#define M_do_cipher(ctx, out, in, inl) \
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EVP_Cipher(ctx,out,in,inl)
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#else
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#define M_do_cipher(ctx, out, in, inl) \
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ctx->cipher->do_cipher(ctx,out,in,inl)
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#endif
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1998-12-21 10:56:39 +00:00
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2008-09-15 22:21:42 +00:00
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const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT;
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1998-12-21 10:52:47 +00:00
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2005-12-02 13:47:02 +00:00
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EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
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{
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EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
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if (ctx)
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EVP_CIPHER_CTX_init(ctx);
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return ctx;
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}
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2001-10-17 00:37:12 +00:00
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2000-05-28 12:44:46 +00:00
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int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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2001-08-18 13:53:01 +00:00
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const unsigned char *key, const unsigned char *iv, int enc)
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1998-12-21 10:52:47 +00:00
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{
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2002-02-23 13:50:29 +00:00
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if (cipher)
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EVP_CIPHER_CTX_init(ctx);
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2001-09-25 21:37:02 +00:00
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return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
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}
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2001-10-17 00:37:12 +00:00
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2000-05-27 12:38:43 +00:00
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int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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2001-08-18 13:53:01 +00:00
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const unsigned char *in, int inl)
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1998-12-21 10:52:47 +00:00
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{
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if (ctx->encrypt)
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2000-05-27 12:38:43 +00:00
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return EVP_EncryptUpdate(ctx,out,outl,in,inl);
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else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
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1998-12-21 10:52:47 +00:00
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}
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2001-10-17 00:37:12 +00:00
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int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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{
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if (ctx->encrypt)
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return EVP_EncryptFinal_ex(ctx,out,outl);
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else return EVP_DecryptFinal_ex(ctx,out,outl);
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}
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1999-04-19 21:31:43 +00:00
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int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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1998-12-21 10:52:47 +00:00
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{
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if (ctx->encrypt)
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2000-05-27 12:38:43 +00:00
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return EVP_EncryptFinal(ctx,out,outl);
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2001-09-25 21:37:02 +00:00
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else return EVP_DecryptFinal(ctx,out,outl);
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1998-12-21 10:52:47 +00:00
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}
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2000-05-27 12:38:43 +00:00
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int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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2001-08-18 13:53:01 +00:00
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const unsigned char *key, const unsigned char *iv)
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1998-12-21 10:52:47 +00:00
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{
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2001-10-17 00:37:12 +00:00
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return EVP_CipherInit(ctx, cipher, key, iv, 1);
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2001-10-08 17:24:10 +00:00
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}
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int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
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const unsigned char *key, const unsigned char *iv)
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{
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return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
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1998-12-21 10:52:47 +00:00
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}
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2000-05-27 12:38:43 +00:00
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int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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2001-08-18 13:53:01 +00:00
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const unsigned char *key, const unsigned char *iv)
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1998-12-21 10:52:47 +00:00
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{
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2003-01-17 00:48:47 +00:00
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return EVP_CipherInit(ctx, cipher, key, iv, 0);
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2001-10-08 17:24:10 +00:00
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}
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int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
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const unsigned char *key, const unsigned char *iv)
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{
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return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
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1998-12-21 10:52:47 +00:00
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}
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2000-05-27 12:38:43 +00:00
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int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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2001-08-18 13:53:01 +00:00
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const unsigned char *in, int inl)
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1998-12-21 10:52:47 +00:00
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{
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int i,j,bl;
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2008-09-15 22:32:23 +00:00
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if (inl <= 0)
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{
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*outl = 0;
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return inl == 0;
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}
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2001-07-09 21:00:36 +00:00
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if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
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2001-07-08 19:42:10 +00:00
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{
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2008-09-15 22:21:42 +00:00
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if(M_do_cipher(ctx,out,in,inl))
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2001-07-08 19:42:10 +00:00
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{
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*outl=inl;
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return 1;
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}
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else
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{
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*outl=0;
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return 0;
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}
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}
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2001-07-09 21:00:36 +00:00
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i=ctx->buf_len;
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bl=ctx->cipher->block_size;
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2003-10-29 20:24:15 +00:00
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OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
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1998-12-21 10:52:47 +00:00
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if (i != 0)
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{
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if (i+inl < bl)
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{
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memcpy(&(ctx->buf[i]),in,inl);
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ctx->buf_len+=inl;
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2001-07-09 21:00:36 +00:00
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*outl=0;
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2000-05-27 12:38:43 +00:00
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return 1;
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1998-12-21 10:52:47 +00:00
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}
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else
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{
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j=bl-i;
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2001-07-09 21:00:36 +00:00
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memcpy(&(ctx->buf[i]),in,j);
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2008-09-15 22:21:42 +00:00
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if(!M_do_cipher(ctx,out,ctx->buf,bl)) return 0;
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1998-12-21 10:52:47 +00:00
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inl-=j;
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in+=j;
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out+=bl;
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2001-07-09 21:00:36 +00:00
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*outl=bl;
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1998-12-21 10:52:47 +00:00
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}
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}
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2001-07-27 02:24:47 +00:00
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else
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*outl = 0;
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2001-07-08 17:27:32 +00:00
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i=inl&(bl-1);
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1998-12-21 10:52:47 +00:00
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inl-=i;
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if (inl > 0)
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{
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2008-09-15 22:21:42 +00:00
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if(!M_do_cipher(ctx,out,in,inl)) return 0;
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1998-12-21 10:52:47 +00:00
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*outl+=inl;
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}
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if (i != 0)
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memcpy(ctx->buf,&(in[inl]),i);
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ctx->buf_len=i;
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2000-05-27 12:38:43 +00:00
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return 1;
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1998-12-21 10:52:47 +00:00
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}
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2000-05-27 12:38:43 +00:00
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int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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2001-10-17 00:37:12 +00:00
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{
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int ret;
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ret = EVP_EncryptFinal_ex(ctx, out, outl);
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return ret;
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}
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int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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1998-12-21 10:52:47 +00:00
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{
|
2003-10-29 20:24:15 +00:00
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int n,ret;
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unsigned int i, b, bl;
|
1998-12-21 10:52:47 +00:00
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b=ctx->cipher->block_size;
|
2002-11-13 15:43:43 +00:00
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OPENSSL_assert(b <= sizeof ctx->buf);
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1998-12-21 10:52:47 +00:00
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if (b == 1)
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{
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*outl=0;
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2000-05-27 12:38:43 +00:00
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return 1;
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1998-12-21 10:52:47 +00:00
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}
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bl=ctx->buf_len;
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2001-02-14 02:11:52 +00:00
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if (ctx->flags & EVP_CIPH_NO_PADDING)
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{
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if(bl)
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{
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2005-05-11 03:45:39 +00:00
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EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
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2001-02-14 02:11:52 +00:00
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return 0;
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}
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*outl = 0;
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return 1;
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}
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2001-08-11 11:32:54 +00:00
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1998-12-21 10:52:47 +00:00
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n=b-bl;
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for (i=bl; i<b; i++)
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ctx->buf[i]=n;
|
2008-09-15 22:21:42 +00:00
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ret=M_do_cipher(ctx,out,ctx->buf,b);
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2001-08-11 11:32:54 +00:00
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if(ret)
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*outl=b;
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return ret;
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1998-12-21 10:52:47 +00:00
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}
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2000-05-27 12:38:43 +00:00
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int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
|
2001-08-18 13:53:01 +00:00
|
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const unsigned char *in, int inl)
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1998-12-21 10:52:47 +00:00
|
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{
|
2003-10-29 20:24:15 +00:00
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int fix_len;
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unsigned int b;
|
1998-12-21 10:52:47 +00:00
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|
2008-09-15 22:32:23 +00:00
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if (inl <= 0)
|
2001-07-09 21:00:36 +00:00
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{
|
2008-09-15 22:32:23 +00:00
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*outl = 0;
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return inl == 0;
|
2001-07-09 21:00:36 +00:00
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}
|
1998-12-21 10:52:47 +00:00
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2001-02-14 02:11:52 +00:00
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if (ctx->flags & EVP_CIPH_NO_PADDING)
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return EVP_EncryptUpdate(ctx, out, outl, in, inl);
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|
1998-12-21 10:52:47 +00:00
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b=ctx->cipher->block_size;
|
2002-11-13 15:43:43 +00:00
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OPENSSL_assert(b <= sizeof ctx->final);
|
2001-10-02 16:19:49 +00:00
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2001-07-09 21:00:36 +00:00
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if(ctx->final_used)
|
1998-12-21 10:52:47 +00:00
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{
|
2001-07-09 21:00:36 +00:00
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memcpy(out,ctx->final,b);
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out+=b;
|
2001-10-02 16:19:49 +00:00
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fix_len = 1;
|
1998-12-21 10:52:47 +00:00
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}
|
2001-10-02 16:19:49 +00:00
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else
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fix_len = 0;
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2001-07-09 21:00:36 +00:00
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if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
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|
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return 0;
|
1998-12-21 10:52:47 +00:00
|
|
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/* if we have 'decrypted' a multiple of block size, make sure
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* we have a copy of this last block */
|
2001-07-09 21:00:36 +00:00
|
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|
if (b > 1 && !ctx->buf_len)
|
1998-12-21 10:52:47 +00:00
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{
|
2001-10-02 16:19:49 +00:00
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*outl-=b;
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ctx->final_used=1;
|
2001-07-09 21:00:36 +00:00
|
|
|
memcpy(ctx->final,&out[*outl],b);
|
|
|
|
}
|
2001-10-02 16:19:49 +00:00
|
|
|
else
|
|
|
|
ctx->final_used = 0;
|
|
|
|
|
|
|
|
if (fix_len)
|
|
|
|
*outl += b;
|
|
|
|
|
2000-05-27 12:38:43 +00:00
|
|
|
return 1;
|
1998-12-21 10:52:47 +00:00
|
|
|
}
|
|
|
|
|
1999-04-19 21:31:43 +00:00
|
|
|
int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
|
2001-10-17 00:37:12 +00:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
ret = EVP_DecryptFinal_ex(ctx, out, outl);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
|
1998-12-21 10:52:47 +00:00
|
|
|
{
|
2014-09-05 12:47:33 +00:00
|
|
|
unsigned int i, b;
|
|
|
|
unsigned char pad, padding_good;
|
1998-12-21 10:52:47 +00:00
|
|
|
|
|
|
|
*outl=0;
|
2014-09-05 12:47:33 +00:00
|
|
|
b=(unsigned int)(ctx->cipher->block_size);
|
2001-02-14 02:11:52 +00:00
|
|
|
if (ctx->flags & EVP_CIPH_NO_PADDING)
|
|
|
|
{
|
|
|
|
if(ctx->buf_len)
|
|
|
|
{
|
2005-05-11 03:45:39 +00:00
|
|
|
EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
|
2001-02-14 02:11:52 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
*outl = 0;
|
|
|
|
return 1;
|
|
|
|
}
|
1998-12-21 10:52:47 +00:00
|
|
|
if (b > 1)
|
|
|
|
{
|
2001-07-09 21:00:36 +00:00
|
|
|
if (ctx->buf_len || !ctx->final_used)
|
1998-12-21 10:52:47 +00:00
|
|
|
{
|
2005-05-11 03:45:39 +00:00
|
|
|
EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
|
1998-12-21 10:52:47 +00:00
|
|
|
return(0);
|
|
|
|
}
|
2002-11-13 15:43:43 +00:00
|
|
|
OPENSSL_assert(b <= sizeof ctx->final);
|
2014-09-05 12:47:33 +00:00
|
|
|
pad=ctx->final[b-1];
|
|
|
|
|
|
|
|
padding_good = (unsigned char)(~constant_time_is_zero_8(pad));
|
|
|
|
padding_good &= constant_time_ge_8(b, pad);
|
|
|
|
|
|
|
|
for (i = 1; i < b; ++i)
|
1998-12-21 10:52:47 +00:00
|
|
|
{
|
2014-09-05 12:47:33 +00:00
|
|
|
unsigned char is_pad_index = constant_time_lt_8(i, pad);
|
|
|
|
unsigned char pad_byte_good = constant_time_eq_8(ctx->final[b-i-1], pad);
|
|
|
|
padding_good &= constant_time_select_8(is_pad_index, pad_byte_good, 0xff);
|
1998-12-21 10:52:47 +00:00
|
|
|
}
|
2014-09-05 12:47:33 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* At least 1 byte is always padding, so we always write b - 1
|
|
|
|
* bytes to avoid a timing leak. The caller is required to have |b|
|
|
|
|
* bytes space in |out| by the API contract.
|
|
|
|
*/
|
|
|
|
for (i = 0; i < b - 1; ++i)
|
|
|
|
out[i] = ctx->final[i] & padding_good;
|
|
|
|
/* Safe cast: for a good padding, EVP_MAX_IV_LENGTH >= b >= pad */
|
|
|
|
*outl = padding_good & ((unsigned char)(b - pad));
|
|
|
|
return padding_good & 1;
|
1998-12-21 10:52:47 +00:00
|
|
|
}
|
|
|
|
else
|
2014-09-05 12:47:33 +00:00
|
|
|
{
|
|
|
|
*outl = 0;
|
|
|
|
return 1;
|
|
|
|
}
|
1998-12-21 10:52:47 +00:00
|
|
|
}
|
|
|
|
|
2005-12-02 13:47:02 +00:00
|
|
|
void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
|
|
|
|
{
|
|
|
|
if (ctx)
|
|
|
|
{
|
|
|
|
EVP_CIPHER_CTX_cleanup(ctx);
|
|
|
|
OPENSSL_free(ctx);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2000-05-26 23:51:35 +00:00
|
|
|
int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
|
|
|
|
{
|
2000-05-30 18:26:22 +00:00
|
|
|
if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
|
|
|
|
return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
|
2000-05-26 23:51:35 +00:00
|
|
|
if(c->key_len == keylen) return 1;
|
|
|
|
if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
|
|
|
|
{
|
|
|
|
c->key_len = keylen;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
|
|
|
|
return 0;
|
|
|
|
}
|
2000-05-30 18:26:22 +00:00
|
|
|
|
2001-02-14 02:11:52 +00:00
|
|
|
int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
|
|
|
|
{
|
|
|
|
if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
|
|
|
|
else ctx->flags |= EVP_CIPH_NO_PADDING;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2004-03-28 17:38:00 +00:00
|
|
|
int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
|
|
|
|
{
|
|
|
|
if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
|
|
|
|
return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
|
|
|
|
if (RAND_bytes(key, ctx->key_len) <= 0)
|
|
|
|
return 0;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2008-09-15 22:21:42 +00:00
|
|
|
#ifndef OPENSSL_NO_ENGINE
|
|
|
|
|
|
|
|
#ifdef OPENSSL_FIPS
|
|
|
|
|
|
|
|
static int do_evp_enc_engine_full(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl)
|
|
|
|
{
|
|
|
|
if(impl)
|
|
|
|
{
|
|
|
|
if (!ENGINE_init(impl))
|
|
|
|
{
|
|
|
|
EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else
|
|
|
|
/* Ask if an ENGINE is reserved for this job */
|
|
|
|
impl = ENGINE_get_cipher_engine((*pcipher)->nid);
|
|
|
|
if(impl)
|
|
|
|
{
|
|
|
|
/* There's an ENGINE for this job ... (apparently) */
|
|
|
|
const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid);
|
|
|
|
if(!c)
|
|
|
|
{
|
|
|
|
/* One positive side-effect of US's export
|
|
|
|
* control history, is that we should at least
|
|
|
|
* be able to avoid using US mispellings of
|
|
|
|
* "initialisation"? */
|
|
|
|
EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* We'll use the ENGINE's private cipher definition */
|
|
|
|
*pcipher = c;
|
|
|
|
/* Store the ENGINE functional reference so we know
|
|
|
|
* 'cipher' came from an ENGINE and we need to release
|
|
|
|
* it when done. */
|
|
|
|
ctx->engine = impl;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
ctx->engine = NULL;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void int_EVP_CIPHER_init_engine_callbacks(void)
|
|
|
|
{
|
|
|
|
int_EVP_CIPHER_set_engine_callbacks(
|
|
|
|
ENGINE_finish, do_evp_enc_engine_full);
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#endif
|