440 lines
11 KiB
C
440 lines
11 KiB
C
/* crypto/evp/evp_enc.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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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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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#ifndef OPENSSL_NO_ENGINE
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#include <openssl/engine.h>
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#endif
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#include "evp_locl.h"
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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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const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT;
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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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int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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const unsigned char *key, const unsigned char *iv, int enc)
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{
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if (cipher)
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EVP_CIPHER_CTX_init(ctx);
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return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
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}
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int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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const unsigned char *in, int inl)
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{
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if (ctx->encrypt)
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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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}
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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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int EVP_CipherFinal(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(ctx,out,outl);
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else return EVP_DecryptFinal(ctx,out,outl);
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}
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int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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const unsigned char *key, const unsigned char *iv)
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{
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return EVP_CipherInit(ctx, cipher, key, iv, 1);
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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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}
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int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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const unsigned char *key, const unsigned char *iv)
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{
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return EVP_CipherInit(ctx, cipher, key, iv, 0);
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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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}
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int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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const unsigned char *in, int inl)
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{
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int i,j,bl;
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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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if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
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{
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if(M_do_cipher(ctx,out,in,inl))
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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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i=ctx->buf_len;
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bl=ctx->cipher->block_size;
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OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
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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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*outl=0;
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return 1;
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}
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else
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{
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j=bl-i;
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memcpy(&(ctx->buf[i]),in,j);
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if(!M_do_cipher(ctx,out,ctx->buf,bl)) return 0;
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inl-=j;
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in+=j;
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out+=bl;
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*outl=bl;
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}
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}
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else
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*outl = 0;
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i=inl&(bl-1);
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inl-=i;
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if (inl > 0)
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{
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if(!M_do_cipher(ctx,out,in,inl)) return 0;
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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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return 1;
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}
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int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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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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{
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int n,ret;
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unsigned int i, b, bl;
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b=ctx->cipher->block_size;
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OPENSSL_assert(b <= sizeof ctx->buf);
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if (b == 1)
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{
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*outl=0;
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return 1;
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}
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bl=ctx->buf_len;
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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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EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
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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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n=b-bl;
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for (i=bl; i<b; i++)
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ctx->buf[i]=n;
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ret=M_do_cipher(ctx,out,ctx->buf,b);
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if(ret)
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*outl=b;
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return ret;
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}
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int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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const unsigned char *in, int inl)
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{
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int fix_len;
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unsigned int b;
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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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if (ctx->flags & EVP_CIPH_NO_PADDING)
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return EVP_EncryptUpdate(ctx, out, outl, in, inl);
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b=ctx->cipher->block_size;
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OPENSSL_assert(b <= sizeof ctx->final);
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if(ctx->final_used)
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{
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memcpy(out,ctx->final,b);
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out+=b;
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fix_len = 1;
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}
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else
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fix_len = 0;
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if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
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return 0;
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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 */
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if (b > 1 && !ctx->buf_len)
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{
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*outl-=b;
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ctx->final_used=1;
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memcpy(ctx->final,&out[*outl],b);
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}
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else
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ctx->final_used = 0;
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if (fix_len)
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*outl += b;
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return 1;
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}
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int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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{
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int ret;
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ret = EVP_DecryptFinal_ex(ctx, out, outl);
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return ret;
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}
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int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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{
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int i,n;
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unsigned int b;
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*outl=0;
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b=ctx->cipher->block_size;
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if (ctx->flags & EVP_CIPH_NO_PADDING)
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{
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if(ctx->buf_len)
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{
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EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
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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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if (b > 1)
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{
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if (ctx->buf_len || !ctx->final_used)
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{
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EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
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return(0);
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}
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OPENSSL_assert(b <= sizeof ctx->final);
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n=ctx->final[b-1];
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if (n == 0 || n > (int)b)
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{
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EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
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return(0);
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}
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for (i=0; i<n; i++)
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{
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if (ctx->final[--b] != n)
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{
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EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
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return(0);
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}
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}
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n=ctx->cipher->block_size-n;
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for (i=0; i<n; i++)
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out[i]=ctx->final[i];
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*outl=n;
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}
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else
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*outl=0;
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return(1);
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}
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void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
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{
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if (ctx)
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{
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EVP_CIPHER_CTX_cleanup(ctx);
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OPENSSL_free(ctx);
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}
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}
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int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
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{
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if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
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return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
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if(c->key_len == keylen) return 1;
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if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
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{
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c->key_len = keylen;
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return 1;
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}
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EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
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return 0;
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}
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int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
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{
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if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
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else ctx->flags |= EVP_CIPH_NO_PADDING;
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return 1;
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}
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int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
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{
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if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
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return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
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if (RAND_bytes(key, ctx->key_len) <= 0)
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return 0;
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return 1;
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}
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#ifndef OPENSSL_NO_ENGINE
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#ifdef OPENSSL_FIPS
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static int do_evp_enc_engine_full(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl)
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{
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if(impl)
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{
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if (!ENGINE_init(impl))
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{
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EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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}
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else
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/* Ask if an ENGINE is reserved for this job */
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impl = ENGINE_get_cipher_engine((*pcipher)->nid);
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if(impl)
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{
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/* There's an ENGINE for this job ... (apparently) */
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const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid);
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if(!c)
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{
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/* One positive side-effect of US's export
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* control history, is that we should at least
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* be able to avoid using US mispellings of
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* "initialisation"? */
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EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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/* We'll use the ENGINE's private cipher definition */
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*pcipher = c;
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/* Store the ENGINE functional reference so we know
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* 'cipher' came from an ENGINE and we need to release
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* it when done. */
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ctx->engine = impl;
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}
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else
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ctx->engine = NULL;
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return 1;
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}
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void int_EVP_CIPHER_init_engine_callbacks(void)
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{
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int_EVP_CIPHER_set_engine_callbacks(
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ENGINE_finish, do_evp_enc_engine_full);
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}
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#endif
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#endif
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