341 lines
8.9 KiB
C
341 lines
8.9 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 "evp_locl.h"
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const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
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void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
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{
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memset(ctx,0,sizeof(EVP_CIPHER_CTX));
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/* ctx->cipher=NULL; */
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}
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int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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unsigned char *key, unsigned char *iv, int enc)
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{
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if(enc && (enc != -1)) enc = 1;
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if (cipher) {
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ctx->cipher=cipher;
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ctx->key_len = cipher->key_len;
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if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
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if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
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EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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}
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} else if(!ctx->cipher) {
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EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
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return 0;
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}
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if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
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switch(EVP_CIPHER_CTX_mode(ctx)) {
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case EVP_CIPH_STREAM_CIPHER:
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case EVP_CIPH_ECB_MODE:
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break;
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case EVP_CIPH_CFB_MODE:
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case EVP_CIPH_OFB_MODE:
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ctx->num = 0;
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case EVP_CIPH_CBC_MODE:
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if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
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memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
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break;
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default:
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return 0;
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break;
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}
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}
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if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
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if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
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}
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if(enc != -1) ctx->encrypt=enc;
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ctx->buf_len=0;
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return 1;
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}
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int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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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(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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unsigned char *key, 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_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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unsigned char *key, 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_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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unsigned char *in, int inl)
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{
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int i,j,bl;
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i=ctx->buf_len;
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bl=ctx->cipher->block_size;
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*outl=0;
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if ((inl == 0) && (i != bl)) return 1;
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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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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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if (j != 0) memcpy(&(ctx->buf[i]),in,j);
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if(!ctx->cipher->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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i=inl%bl; /* how much is left */
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inl-=i;
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if (inl > 0)
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{
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if(!ctx->cipher->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 i,n,b,bl;
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b=ctx->cipher->block_size;
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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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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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if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,b)) return 0;
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*outl=b;
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return 1;
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}
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int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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unsigned char *in, int inl)
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{
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int b,bl,n;
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int keep_last=0;
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*outl=0;
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if (inl == 0) return 1;
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b=ctx->cipher->block_size;
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if (b > 1)
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{
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/* Is the input a multiple of the block size? */
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bl=ctx->buf_len;
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n=inl+bl;
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if (n%b == 0)
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{
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if (inl < b) /* must be 'just one' buff */
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{
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memcpy(&(ctx->buf[bl]),in,inl);
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ctx->buf_len=b;
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*outl=0;
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return 1;
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}
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keep_last=1;
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inl-=b; /* don't do the last block */
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}
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}
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if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) 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 (keep_last)
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{
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memcpy(&(ctx->buf[0]),&(in[inl]),b);
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#ifdef DEBUG
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if (ctx->buf_len != 0)
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{
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abort();
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}
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#endif
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ctx->buf_len=b;
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}
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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 i,b;
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int n;
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*outl=0;
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b=ctx->cipher->block_size;
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if (b > 1)
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{
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if (ctx->buf_len != b)
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{
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EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
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return(0);
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}
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if(!EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0)) return 0;
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if (n != b)
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return(0);
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n=ctx->buf[b-1];
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if (n > b)
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{
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EVPerr(EVP_F_EVP_DECRYPTFINAL,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->buf[--b] != n)
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{
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EVPerr(EVP_F_EVP_DECRYPTFINAL,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->buf[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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int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
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{
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if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
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{
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if(!c->cipher->cleanup(c)) return 0;
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}
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memset(c,0,sizeof(EVP_CIPHER_CTX));
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return 1;
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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_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
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{
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int ret;
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if(!ctx->cipher) {
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EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
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return 0;
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}
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if(!ctx->cipher->ctrl) {
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EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
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return 0;
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}
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ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
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if(ret == -1) {
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EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
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return 0;
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}
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return ret;
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}
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