/* crypto/evp/evp_enc.c *//* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. *  * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to.  The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code.  The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). *  * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. *  * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *    "This product includes cryptographic software written by *     Eric Young (eay@cryptsoft.com)" *    The word 'cryptographic' can be left out if the rouines from the library *    being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from  *    the apps directory (application code) you must include an acknowledgement: *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" *  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. *  * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed.  i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */#include <stdio.h>#include "cryptlib.h"#include <openssl/evp.h>#include <openssl/err.h>#include <openssl/rand.h>#ifndef OPENSSL_NO_ENGINE#include <openssl/engine.h>#endif#include "evp_locl.h"#ifdef OPENSSL_FIPS	#define M_do_cipher(ctx, out, in, inl) \		EVP_Cipher(ctx,out,in,inl)#else	#define M_do_cipher(ctx, out, in, inl) \		ctx->cipher->do_cipher(ctx,out,in,inl)#endifconst char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT;EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)	{	EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx);	if (ctx)		EVP_CIPHER_CTX_init(ctx);	return ctx;	}int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,	     const unsigned char *key, const unsigned char *iv, int enc)	{	if (cipher)		EVP_CIPHER_CTX_init(ctx);	return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);	}int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,	     const unsigned char *in, int inl)	{	if (ctx->encrypt)		return EVP_EncryptUpdate(ctx,out,outl,in,inl);	else	return EVP_DecryptUpdate(ctx,out,outl,in,inl);	}int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)	{	if (ctx->encrypt)		return EVP_EncryptFinal_ex(ctx,out,outl);	else	return EVP_DecryptFinal_ex(ctx,out,outl);	}int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)	{	if (ctx->encrypt)		return EVP_EncryptFinal(ctx,out,outl);	else	return EVP_DecryptFinal(ctx,out,outl);	}int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,	     const unsigned char *key, const unsigned char *iv)	{	return EVP_CipherInit(ctx, cipher, key, iv, 1);	}int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl,		const unsigned char *key, const unsigned char *iv)	{	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);	}int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,	     const unsigned char *key, const unsigned char *iv)	{	return EVP_CipherInit(ctx, cipher, key, iv, 0);	}int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,	     const unsigned char *key, const unsigned char *iv)	{	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);	}int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,	     const unsigned char *in, int inl)	{	int i,j,bl;	if (inl <= 0)		{		*outl = 0;		return inl == 0;		}	if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)		{		if(M_do_cipher(ctx,out,in,inl))			{			*outl=inl;			return 1;			}		else			{			*outl=0;			return 0;			}		}	i=ctx->buf_len;	bl=ctx->cipher->block_size;	OPENSSL_assert(bl <= (int)sizeof(ctx->buf));	if (i != 0)		{		if (i+inl < bl)			{			memcpy(&(ctx->buf[i]),in,inl);			ctx->buf_len+=inl;			*outl=0;			return 1;			}		else			{			j=bl-i;			memcpy(&(ctx->buf[i]),in,j);			if(!M_do_cipher(ctx,out,ctx->buf,bl)) return 0;			inl-=j;			in+=j;			out+=bl;			*outl=bl;			}		}	else		*outl = 0;	i=inl&(bl-1);	inl-=i;	if (inl > 0)		{		if(!M_do_cipher(ctx,out,in,inl)) return 0;		*outl+=inl;		}	if (i != 0)		memcpy(ctx->buf,&(in[inl]),i);	ctx->buf_len=i;	return 1;	}int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)	{	int ret;	ret = EVP_EncryptFinal_ex(ctx, out, outl);	return ret;	}int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)	{	int n,ret;	unsigned int i, b, bl;	b=ctx->cipher->block_size;	OPENSSL_assert(b <= sizeof ctx->buf);	if (b == 1)		{		*outl=0;		return 1;		}	bl=ctx->buf_len;	if (ctx->flags & EVP_CIPH_NO_PADDING)		{		if(bl)			{			EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);			return 0;			}		*outl = 0;		return 1;		}	n=b-bl;	for (i=bl; i<b; i++)		ctx->buf[i]=n;	ret=M_do_cipher(ctx,out,ctx->buf,b);	if(ret)		*outl=b;	return ret;	}int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,	     const unsigned char *in, int inl)	{	int fix_len;	unsigned int b;	if (inl <= 0)		{		*outl = 0;		return inl == 0;		}	if (ctx->flags & EVP_CIPH_NO_PADDING)		return EVP_EncryptUpdate(ctx, out, outl, in, inl);	b=ctx->cipher->block_size;	OPENSSL_assert(b <= sizeof ctx->final);	if(ctx->final_used)		{		memcpy(out,ctx->final,b);		out+=b;		fix_len = 1;		}	else		fix_len = 0;	if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))		return 0;	/* if we have 'decrypted' a multiple of block size, make sure	 * we have a copy of this last block */	if (b > 1 && !ctx->buf_len)		{		*outl-=b;		ctx->final_used=1;		memcpy(ctx->final,&out[*outl],b);		}	else		ctx->final_used = 0;	if (fix_len)		*outl += b;			return 1;	}int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)	{	int ret;	ret = EVP_DecryptFinal_ex(ctx, out, outl);	return ret;	}int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)	{	int i,n;	unsigned int b;	*outl=0;	b=ctx->cipher->block_size;	if (ctx->flags & EVP_CIPH_NO_PADDING)		{		if(ctx->buf_len)			{			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);			return 0;			}		*outl = 0;		return 1;		}	if (b > 1)		{		if (ctx->buf_len || !ctx->final_used)			{			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);			return(0);			}		OPENSSL_assert(b <= sizeof ctx->final);		n=ctx->final[b-1];		if (n == 0 || n > (int)b)			{			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);			return(0);			}		for (i=0; i<n; i++)			{			if (ctx->final[--b] != n)				{				EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);				return(0);				}			}		n=ctx->cipher->block_size-n;		for (i=0; i<n; i++)			out[i]=ctx->final[i];		*outl=n;		}	else		*outl=0;	return(1);	}void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)	{	if (ctx)		{		EVP_CIPHER_CTX_cleanup(ctx);		OPENSSL_free(ctx);		}	}int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)	{	if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) 		return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);	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;	}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;	}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;	}#ifndef OPENSSL_NO_ENGINE#ifdef OPENSSL_FIPSstatic 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