/* crypto/evp/enc_min.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"void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)	{#ifdef OPENSSL_FIPS	FIPS_selftest_check();#endif	memset(ctx,0,sizeof(EVP_CIPHER_CTX));	/* ctx->cipher=NULL; */	}#ifdef OPENSSL_FIPS/* The purpose of these is to trap programs that attempt to use non FIPS * algorithms in FIPS mode and ignore the errors. */static int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,		    const unsigned char *iv, int enc)	{ FIPS_ERROR_IGNORED("Cipher init"); return 0;}static int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,			 const unsigned char *in, unsigned int inl)	{ FIPS_ERROR_IGNORED("Cipher update"); return 0;}/* NB: no cleanup because it is allowed after failed init */static int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)	{ FIPS_ERROR_IGNORED("Cipher set_asn1"); return 0;}static int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)	{ FIPS_ERROR_IGNORED("Cipher get_asn1"); return 0;}static int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)	{ FIPS_ERROR_IGNORED("Cipher ctrl"); return 0;}static const EVP_CIPHER bad_cipher =	{	0,	0,	0,	0,	0,	bad_init,	bad_do_cipher,	NULL,	0,	bad_set_asn1,	bad_get_asn1,	bad_ctrl,	NULL	};#endif#ifndef OPENSSL_NO_ENGINE#ifdef OPENSSL_FIPSstatic int do_engine_null(ENGINE *impl) { return 0;}static int do_evp_enc_engine_null(EVP_CIPHER_CTX *ctx,				const EVP_CIPHER **pciph, ENGINE *impl)	{ return 1; }static int (*do_engine_finish)(ENGINE *impl)		= do_engine_null;static int (*do_evp_enc_engine)	(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl)		= do_evp_enc_engine_null;void int_EVP_CIPHER_set_engine_callbacks(	int (*eng_ciph_fin)(ENGINE *impl),	int (*eng_ciph_evp)		(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl))	{	do_engine_finish = eng_ciph_fin;	do_evp_enc_engine = eng_ciph_evp;	}#else#define do_engine_finish ENGINE_finishstatic int do_evp_enc_engine(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl)	{	if(impl)		{		if (!ENGINE_init(impl))			{			EVPerr(EVP_F_DO_EVP_ENC_ENGINE, 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, 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;	}#endif#endifint EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,	     const unsigned char *key, const unsigned char *iv, int enc)	{	if (enc == -1)		enc = ctx->encrypt;	else		{		if (enc)			enc = 1;		ctx->encrypt = enc;		}#ifdef OPENSSL_FIPS	if(FIPS_selftest_failed())		{		FIPSerr(FIPS_F_EVP_CIPHERINIT_EX,FIPS_R_FIPS_SELFTEST_FAILED);		ctx->cipher = &bad_cipher;		return 0;		}#endif#ifndef OPENSSL_NO_ENGINE	/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts	 * so this context may already have an ENGINE! Try to avoid releasing	 * the previous handle, re-querying for an ENGINE, and having a	 * reinitialisation, when it may all be unecessary. */	if (ctx->engine && ctx->cipher && (!cipher ||			(cipher && (cipher->nid == ctx->cipher->nid))))		goto skip_to_init;#endif	if (cipher)		{		/* Ensure a context left lying around from last time is cleared		 * (the previous check attempted to avoid this if the same		 * ENGINE and EVP_CIPHER could be used). */		EVP_CIPHER_CTX_cleanup(ctx);		/* Restore encrypt field: it is zeroed by cleanup */		ctx->encrypt = enc;#ifndef OPENSSL_NO_ENGINE		if (!do_evp_enc_engine(ctx, &cipher, impl))			return 0;#endif		ctx->cipher=cipher;		if (ctx->cipher->ctx_size)			{			ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);			if (!ctx->cipher_data)				{				EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);				return 0;				}			}		else			{			ctx->cipher_data = NULL;			}		ctx->key_len = cipher->key_len;		ctx->flags = 0;		if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)			{			if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))				{				EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);				return 0;				}			}		}	else if(!ctx->cipher)		{		EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);		return 0;		}#ifndef OPENSSL_NO_ENGINEskip_to_init:#endif	/* we assume block size is a power of 2 in *cryptUpdate */	OPENSSL_assert(ctx->cipher->block_size == 1	    || ctx->cipher->block_size == 8	    || ctx->cipher->block_size == 16);	if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {		switch(EVP_CIPHER_CTX_mode(ctx)) {			case EVP_CIPH_STREAM_CIPHER:			case EVP_CIPH_ECB_MODE:			break;			case EVP_CIPH_CFB_MODE:			case EVP_CIPH_OFB_MODE:			ctx->num = 0;			case EVP_CIPH_CBC_MODE:			OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=					(int)sizeof(ctx->iv));			if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));			memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));			break;			default:			return 0;			break;		}	}#ifdef OPENSSL_FIPS	/* After 'key' is set no further parameters changes are permissible.	 * So only check for non FIPS enabling at this point.	 */	if (key && FIPS_mode())		{		if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS)			& !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))			{			EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_DISABLED_FOR_FIPS);#if 0			ERR_add_error_data(2, "cipher=",						EVP_CIPHER_name(ctx->cipher));#endif			ctx->cipher = &bad_cipher;			return 0;			}		}#endif	if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {		if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;	}	ctx->buf_len=0;	ctx->final_used=0;	ctx->block_mask=ctx->cipher->block_size-1;	return 1;	}int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)	{	if (c->cipher != NULL)		{		if(c->cipher->cleanup && !c->cipher->cleanup(c))			return 0;		/* Cleanse cipher context data */		if (c->cipher_data)			OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);		}	if (c->cipher_data)		OPENSSL_free(c->cipher_data);#ifndef OPENSSL_NO_ENGINE	if (c->engine)		/* The EVP_CIPHER we used belongs to an ENGINE, release the		 * functional reference we held for this reason. */		do_engine_finish(c->engine);#endif	memset(c,0,sizeof(EVP_CIPHER_CTX));	return 1;	}int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, unsigned int inl)	{#ifdef OPENSSL_FIPS	FIPS_selftest_check();#endif	return ctx->cipher->do_cipher(ctx,out,in,inl);	}int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr){	int ret;	if(!ctx->cipher) {		EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);		return 0;	}	if(!ctx->cipher->ctrl) {		EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);		return 0;	}	ret = ctx->cipher->ctrl(ctx, type, arg, ptr);	if(ret == -1) {		EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);		return 0;	}	return ret;}unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)	{	return ctx->cipher->flags;	}int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)	{	return ctx->cipher->iv_len;	}int EVP_CIPHER_nid(const EVP_CIPHER *cipher)	{	return cipher->nid;	}