sl@0: /* crypto/evp/evp_enc.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/evp.h>
sl@0: #include <openssl/err.h>
sl@0: #include <openssl/rand.h>
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: #include <openssl/engine.h>
sl@0: #endif
sl@0: #include "evp_locl.h"
sl@0: 
sl@0: const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT;
sl@0: 
sl@0: EXPORT_C void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
sl@0: 	{
sl@0: 	memset(ctx,0,sizeof(EVP_CIPHER_CTX));
sl@0: 	/* ctx->cipher=NULL; */
sl@0: 	}
sl@0: 
sl@0: EXPORT_C EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
sl@0: 	{
sl@0: 	EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
sl@0: 	if (ctx)
sl@0: 		EVP_CIPHER_CTX_init(ctx);
sl@0: 	return ctx;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
sl@0: 	     const unsigned char *key, const unsigned char *iv, int enc)
sl@0: 	{
sl@0: 	if (cipher)
sl@0: 		EVP_CIPHER_CTX_init(ctx);
sl@0: 	return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
sl@0: 	     const unsigned char *key, const unsigned char *iv, int enc)
sl@0: 	{
sl@0: 	if (enc == -1)
sl@0: 		enc = ctx->encrypt;
sl@0: 	else
sl@0: 		{
sl@0: 		if (enc)
sl@0: 			enc = 1;
sl@0: 		ctx->encrypt = enc;
sl@0: 		}
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 	/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
sl@0: 	 * so this context may already have an ENGINE! Try to avoid releasing
sl@0: 	 * the previous handle, re-querying for an ENGINE, and having a
sl@0: 	 * reinitialisation, when it may all be unecessary. */
sl@0: 	if (ctx->engine && ctx->cipher && (!cipher ||
sl@0: 			(cipher && (cipher->nid == ctx->cipher->nid))))
sl@0: 		goto skip_to_init;
sl@0: #endif
sl@0: 	if (cipher)
sl@0: 		{
sl@0: 		/* Ensure a context left lying around from last time is cleared
sl@0: 		 * (the previous check attempted to avoid this if the same
sl@0: 		 * ENGINE and EVP_CIPHER could be used). */
sl@0: 		EVP_CIPHER_CTX_cleanup(ctx);
sl@0: 
sl@0: 		/* Restore encrypt field: it is zeroed by cleanup */
sl@0: 		ctx->encrypt = enc;
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 		if(impl)
sl@0: 			{
sl@0: 			if (!ENGINE_init(impl))
sl@0: 				{
sl@0: 				EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
sl@0: 				return 0;
sl@0: 				}
sl@0: 			}
sl@0: 		else
sl@0: 			/* Ask if an ENGINE is reserved for this job */
sl@0: 			impl = ENGINE_get_cipher_engine(cipher->nid);
sl@0: 		if(impl)
sl@0: 			{
sl@0: 			/* There's an ENGINE for this job ... (apparently) */
sl@0: 			const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
sl@0: 			if(!c)
sl@0: 				{
sl@0: 				/* One positive side-effect of US's export
sl@0: 				 * control history, is that we should at least
sl@0: 				 * be able to avoid using US mispellings of
sl@0: 				 * "initialisation"? */
sl@0: 				EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
sl@0: 				return 0;
sl@0: 				}
sl@0: 			/* We'll use the ENGINE's private cipher definition */
sl@0: 			cipher = c;
sl@0: 			/* Store the ENGINE functional reference so we know
sl@0: 			 * 'cipher' came from an ENGINE and we need to release
sl@0: 			 * it when done. */
sl@0: 			ctx->engine = impl;
sl@0: 			}
sl@0: 		else
sl@0: 			ctx->engine = NULL;
sl@0: #endif
sl@0: 
sl@0: 		ctx->cipher=cipher;
sl@0: 		if (ctx->cipher->ctx_size)
sl@0: 			{
sl@0: 			ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
sl@0: 			if (!ctx->cipher_data)
sl@0: 				{
sl@0: 				EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
sl@0: 				return 0;
sl@0: 				}
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			ctx->cipher_data = NULL;
sl@0: 			}
sl@0: 		ctx->key_len = cipher->key_len;
sl@0: 		ctx->flags = 0;
sl@0: 		if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
sl@0: 			{
sl@0: 			if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
sl@0: 				{
sl@0: 				EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
sl@0: 				return 0;
sl@0: 				}
sl@0: 			}
sl@0: 		}
sl@0: 	else if(!ctx->cipher)
sl@0: 		{
sl@0: 		EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
sl@0: 		return 0;
sl@0: 		}
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: skip_to_init:
sl@0: #endif
sl@0: 	/* we assume block size is a power of 2 in *cryptUpdate */
sl@0: 	OPENSSL_assert(ctx->cipher->block_size == 1
sl@0: 	    || ctx->cipher->block_size == 8
sl@0: 	    || ctx->cipher->block_size == 16);
sl@0: 
sl@0: 	if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
sl@0: 		switch(EVP_CIPHER_CTX_mode(ctx)) {
sl@0: 
sl@0: 			case EVP_CIPH_STREAM_CIPHER:
sl@0: 			case EVP_CIPH_ECB_MODE:
sl@0: 			break;
sl@0: 
sl@0: 			case EVP_CIPH_CFB_MODE:
sl@0: 			case EVP_CIPH_OFB_MODE:
sl@0: 
sl@0: 			ctx->num = 0;
sl@0: 
sl@0: 			case EVP_CIPH_CBC_MODE:
sl@0: 
sl@0: 			OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
sl@0: 					(int)sizeof(ctx->iv));
sl@0: 			if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
sl@0: 			memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
sl@0: 			break;
sl@0: 
sl@0: 			default:
sl@0: 			return 0;
sl@0: 			break;
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: 	if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
sl@0: 		if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
sl@0: 	}
sl@0: 	ctx->buf_len=0;
sl@0: 	ctx->final_used=0;
sl@0: 	ctx->block_mask=ctx->cipher->block_size-1;
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
sl@0: 	     const unsigned char *in, int inl)
sl@0: 	{
sl@0: 	if (ctx->encrypt)
sl@0: 		return EVP_EncryptUpdate(ctx,out,outl,in,inl);
sl@0: 	else	return EVP_DecryptUpdate(ctx,out,outl,in,inl);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
sl@0: 	{
sl@0: 	if (ctx->encrypt)
sl@0: 		return EVP_EncryptFinal_ex(ctx,out,outl);
sl@0: 	else	return EVP_DecryptFinal_ex(ctx,out,outl);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
sl@0: 	{
sl@0: 	if (ctx->encrypt)
sl@0: 		return EVP_EncryptFinal(ctx,out,outl);
sl@0: 	else	return EVP_DecryptFinal(ctx,out,outl);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
sl@0: 	     const unsigned char *key, const unsigned char *iv)
sl@0: 	{
sl@0: 	return EVP_CipherInit(ctx, cipher, key, iv, 1);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,
sl@0: 		const unsigned char *key, const unsigned char *iv)
sl@0: 	{
sl@0: 	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
sl@0: 	     const unsigned char *key, const unsigned char *iv)
sl@0: 	{
sl@0: 	return EVP_CipherInit(ctx, cipher, key, iv, 0);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
sl@0: 	     const unsigned char *key, const unsigned char *iv)
sl@0: 	{
sl@0: 	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
sl@0: 	     const unsigned char *in, int inl)
sl@0: 	{
sl@0: 	int i,j,bl;
sl@0: 
sl@0: 	OPENSSL_assert(inl > 0);
sl@0: 	if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
sl@0: 		{
sl@0: 		if(ctx->cipher->do_cipher(ctx,out,in,inl))
sl@0: 			{
sl@0: 			*outl=inl;
sl@0: 			return 1;
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			*outl=0;
sl@0: 			return 0;
sl@0: 			}
sl@0: 		}
sl@0: 	i=ctx->buf_len;
sl@0: 	bl=ctx->cipher->block_size;
sl@0: 	OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
sl@0: 	if (i != 0)
sl@0: 		{
sl@0: 		if (i+inl < bl)
sl@0: 			{
sl@0: 			memcpy(&(ctx->buf[i]),in,inl);
sl@0: 			ctx->buf_len+=inl;
sl@0: 			*outl=0;
sl@0: 			return 1;
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			j=bl-i;
sl@0: 			memcpy(&(ctx->buf[i]),in,j);
sl@0: 			if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
sl@0: 			inl-=j;
sl@0: 			in+=j;
sl@0: 			out+=bl;
sl@0: 			*outl=bl;
sl@0: 			}
sl@0: 		}
sl@0: 	else
sl@0: 		*outl = 0;
sl@0: 	i=inl&(bl-1);
sl@0: 	inl-=i;
sl@0: 	if (inl > 0)
sl@0: 		{
sl@0: 		if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
sl@0: 		*outl+=inl;
sl@0: 		}
sl@0: 
sl@0: 	if (i != 0)
sl@0: 		memcpy(ctx->buf,&(in[inl]),i);
sl@0: 	ctx->buf_len=i;
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
sl@0: 	{
sl@0: 	int ret;
sl@0: 	ret = EVP_EncryptFinal_ex(ctx, out, outl);
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
sl@0: 	{
sl@0: 	int n,ret;
sl@0: 	unsigned int i, b, bl;
sl@0: 
sl@0: 	b=ctx->cipher->block_size;
sl@0: 	OPENSSL_assert(b <= sizeof ctx->buf);
sl@0: 	if (b == 1)
sl@0: 		{
sl@0: 		*outl=0;
sl@0: 		return 1;
sl@0: 		}
sl@0: 	bl=ctx->buf_len;
sl@0: 	if (ctx->flags & EVP_CIPH_NO_PADDING)
sl@0: 		{
sl@0: 		if(bl)
sl@0: 			{
sl@0: 			EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
sl@0: 			return 0;
sl@0: 			}
sl@0: 		*outl = 0;
sl@0: 		return 1;
sl@0: 		}
sl@0: 
sl@0: 	n=b-bl;
sl@0: 	for (i=bl; i<b; i++)
sl@0: 		ctx->buf[i]=n;
sl@0: 	ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
sl@0: 
sl@0: 
sl@0: 	if(ret)
sl@0: 		*outl=b;
sl@0: 
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
sl@0: 	     const unsigned char *in, int inl)
sl@0: 	{
sl@0: 	int fix_len;
sl@0: 	unsigned int b;
sl@0: 
sl@0: 	if (inl == 0)
sl@0: 		{
sl@0: 		*outl=0;
sl@0: 		return 1;
sl@0: 		}
sl@0: 
sl@0: 	if (ctx->flags & EVP_CIPH_NO_PADDING)
sl@0: 		return EVP_EncryptUpdate(ctx, out, outl, in, inl);
sl@0: 
sl@0: 	b=ctx->cipher->block_size;
sl@0: 	OPENSSL_assert(b <= sizeof ctx->final);
sl@0: 
sl@0: 	if(ctx->final_used)
sl@0: 		{
sl@0: 		memcpy(out,ctx->final,b);
sl@0: 		out+=b;
sl@0: 		fix_len = 1;
sl@0: 		}
sl@0: 	else
sl@0: 		fix_len = 0;
sl@0: 
sl@0: 
sl@0: 	if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
sl@0: 		return 0;
sl@0: 
sl@0: 	/* if we have 'decrypted' a multiple of block size, make sure
sl@0: 	 * we have a copy of this last block */
sl@0: 	if (b > 1 && !ctx->buf_len)
sl@0: 		{
sl@0: 		*outl-=b;
sl@0: 		ctx->final_used=1;
sl@0: 		memcpy(ctx->final,&out[*outl],b);
sl@0: 		}
sl@0: 	else
sl@0: 		ctx->final_used = 0;
sl@0: 
sl@0: 	if (fix_len)
sl@0: 		*outl += b;
sl@0: 		
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
sl@0: 	{
sl@0: 	int ret;
sl@0: 	ret = EVP_DecryptFinal_ex(ctx, out, outl);
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
sl@0: 	{
sl@0: 	int i,n;
sl@0: 	unsigned int b;
sl@0: 
sl@0: 	*outl=0;
sl@0: 	b=ctx->cipher->block_size;
sl@0: 	if (ctx->flags & EVP_CIPH_NO_PADDING)
sl@0: 		{
sl@0: 		if(ctx->buf_len)
sl@0: 			{
sl@0: 			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
sl@0: 			return 0;
sl@0: 			}
sl@0: 		*outl = 0;
sl@0: 		return 1;
sl@0: 		}
sl@0: 	if (b > 1)
sl@0: 		{
sl@0: 		if (ctx->buf_len || !ctx->final_used)
sl@0: 			{
sl@0: 			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
sl@0: 			return(0);
sl@0: 			}
sl@0: 		OPENSSL_assert(b <= sizeof ctx->final);
sl@0: 		n=ctx->final[b-1];
sl@0: 		if (n == 0 || n > (int)b)
sl@0: 			{
sl@0: 			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
sl@0: 			return(0);
sl@0: 			}
sl@0: 		for (i=0; i<n; i++)
sl@0: 			{
sl@0: 			if (ctx->final[--b] != n)
sl@0: 				{
sl@0: 				EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
sl@0: 				return(0);
sl@0: 				}
sl@0: 			}
sl@0: 		n=ctx->cipher->block_size-n;
sl@0: 		for (i=0; i<n; i++)
sl@0: 			out[i]=ctx->final[i];
sl@0: 		*outl=n;
sl@0: 		}
sl@0: 	else
sl@0: 		*outl=0;
sl@0: 	return(1);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
sl@0: 	{
sl@0: 	if (ctx)
sl@0: 		{
sl@0: 		EVP_CIPHER_CTX_cleanup(ctx);
sl@0: 		OPENSSL_free(ctx);
sl@0: 		}
sl@0: 	}
sl@0: EXPORT_C int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
sl@0: 	{
sl@0: 	if (c->cipher != NULL)
sl@0: 		{
sl@0: 		if(c->cipher->cleanup && !c->cipher->cleanup(c))
sl@0: 			return 0;
sl@0: 		/* Cleanse cipher context data */
sl@0: 		if (c->cipher_data)
sl@0: 			OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
sl@0: 		}
sl@0: 	if (c->cipher_data)
sl@0: 		OPENSSL_free(c->cipher_data);
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 	if (c->engine)
sl@0: 		/* The EVP_CIPHER we used belongs to an ENGINE, release the
sl@0: 		 * functional reference we held for this reason. */
sl@0: 		ENGINE_finish(c->engine);
sl@0: #endif
sl@0: 	memset(c,0,sizeof(EVP_CIPHER_CTX));
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
sl@0: 	{
sl@0: 	if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) 
sl@0: 		return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
sl@0: 	if(c->key_len == keylen) return 1;
sl@0: 	if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
sl@0: 		{
sl@0: 		c->key_len = keylen;
sl@0: 		return 1;
sl@0: 		}
sl@0: 	EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
sl@0: 	return 0;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
sl@0: 	{
sl@0: 	if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
sl@0: 	else ctx->flags |= EVP_CIPH_NO_PADDING;
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
sl@0: {
sl@0: 	int ret;
sl@0: 	if(!ctx->cipher) {
sl@0: 		EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
sl@0: 		return 0;
sl@0: 	}
sl@0: 
sl@0: 	if(!ctx->cipher->ctrl) {
sl@0: 		EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
sl@0: 		return 0;
sl@0: 	}
sl@0: 
sl@0: 	ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
sl@0: 	if(ret == -1) {
sl@0: 		EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
sl@0: 		return 0;
sl@0: 	}
sl@0: 	return ret;
sl@0: }
sl@0: 
sl@0: EXPORT_C int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
sl@0: 	{
sl@0: 	if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
sl@0: 		return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
sl@0: 	if (RAND_bytes(key, ctx->key_len) <= 0)
sl@0: 		return 0;
sl@0: 	return 1;
sl@0: 	}
sl@0: