[thirdparty/openssl.git] / crypto / evp / evp_enc.c

/* 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/engine.h>
#include "evp_locl.h"

#include <assert.h>

const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;

void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
	{
	memset(ctx,0,sizeof(EVP_CIPHER_CTX));
	/* ctx->cipher=NULL; */
	}


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_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;
		}
	/* 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;
	if (cipher)
		{
		/* Ensure an ENGINE 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). */
		if(ctx->engine)
			ENGINE_finish(ctx->engine);
		if(impl)
			{
			if (!ENGINE_init(impl))
				{
				EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
				return 0;
				}
			}
		else
			/* Ask if an ENGINE is reserved for this job */
			impl = ENGINE_get_cipher_engine(cipher->nid);
		if(impl)
			{
			/* There's an ENGINE for this job ... (apparently) */
			const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->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_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
				return 0;
				}
			/* We'll use the ENGINE's private cipher definition */
			cipher = 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;
		ctx->cipher=cipher;
		ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
		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, EVP_R_INITIALIZATION_ERROR);
				return 0;
				}
			}
		}
	else if(!ctx->cipher)
		{
		EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
		return 0;
		}
skip_to_init:
	/* we assume block size is a power of 2 in *cryptUpdate */
	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:

			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;
		}
	}

	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_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_ex(ctx, cipher, NULL, 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(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
		{
		if(ctx->cipher->do_cipher(ctx,out,in,inl))
			{
			*outl=inl;
			return 1;
			}
		else
			{
			*outl=0;
			return 0;
			}
		}
	i=ctx->buf_len;
	bl=ctx->cipher->block_size;
	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(!ctx->cipher->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(!ctx->cipher->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);
	EVP_CIPHER_CTX_cleanup(ctx);
	return ret;
	}

int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
	{
	int i,n,b,bl,ret;

	b=ctx->cipher->block_size;
	if (b == 1)
		{
		EVP_CIPHER_CTX_cleanup(ctx);
		*outl=0;
		return 1;
		}
	bl=ctx->buf_len;
	if (ctx->flags & EVP_CIPH_NO_PADDING)
		{
		EVP_CIPHER_CTX_cleanup(ctx);
		if(bl)
			{
			EVPerr(EVP_F_EVP_ENCRYPTFINAL,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=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);

	EVP_CIPHER_CTX_cleanup(ctx);

	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 b, fix_len;

	if (inl == 0)
		{
		*outl=0;
		return 1;
		}

	if (ctx->flags & EVP_CIPH_NO_PADDING)
		return EVP_EncryptUpdate(ctx, out, outl, in, inl);

	b=ctx->cipher->block_size;

	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);
	EVP_CIPHER_CTX_cleanup(ctx);
	return ret;
	}

int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
	{
	int i,b;
	int n;

	*outl=0;
	b=ctx->cipher->block_size;
	if (ctx->flags & EVP_CIPH_NO_PADDING)
		{
		EVP_CIPHER_CTX_cleanup(ctx);
		if(ctx->buf_len)
			{
			EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
			return 0;
			}
		*outl = 0;
		return 1;
		}
	if (b > 1)
		{
		if (ctx->buf_len || !ctx->final_used)
			{
			EVP_CIPHER_CTX_cleanup(ctx);
			EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
			return(0);
			}
		n=ctx->final[b-1];
		if (n > b)
			{
			EVP_CIPHER_CTX_cleanup(ctx);
			EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
			return(0);
			}
		for (i=0; i<n; i++)
			{
			if (ctx->final[--b] != n)
				{
				EVP_CIPHER_CTX_cleanup(ctx);
				EVPerr(EVP_F_EVP_DECRYPTFINAL,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;
	EVP_CIPHER_CTX_cleanup(ctx);
	return(1);
	}

int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
	{
	if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
		{
		if(!c->cipher->cleanup(c)) return 0;
		}
	OPENSSL_free(c->cipher_data);
	if (c->engine)
		/* The EVP_CIPHER we used belongs to an ENGINE, release the
		 * functional reference we held for this reason. */
		ENGINE_finish(c->engine);
	memset(c,0,sizeof(EVP_CIPHER_CTX));
	return 1;
	}

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_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;
}
Commit	Line	Data
d02b48c6	1	/* crypto/evp/evp_enc.c */
58964a49	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6 RE	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
	59	#include <stdio.h>
	60	#include "cryptlib.h"
ec577822	61	#include <openssl/evp.h>
7f060601	62	#include <openssl/err.h>
11a57c7b	63	#include <openssl/engine.h>
57ae2e24	64	#include "evp_locl.h"
d02b48c6	65
f31b1250 BL	66	#include <assert.h>
f31b1250 BL	67
e778802f	68	const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
58964a49	69
6b691a5c	70	void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
58964a49 RE	71	{
	72	memset(ctx,0,sizeof(EVP_CIPHER_CTX));
	73	/* ctx->cipher=NULL; */
	74	}
d02b48c6	75
581f1c84	76
360370d9	77	int EVP_CipherInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0e360199	78	const unsigned char key, const unsigned char iv, int enc)
d02b48c6	79	{
a3829cb7 DSH	80	if (cipher)
a3829cb7 DSH	81	EVP_CIPHER_CTX_init(ctx);
11a57c7b GT	82	return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
11a57c7b GT	83	}
581f1c84	84
11a57c7b GT	85	int EVP_CipherInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher, ENGINE *impl,
	86	const unsigned char key, const unsigned char iv, int enc)
	87	{
3e268d27 DSH	88	if (enc == -1)
	89	enc = ctx->encrypt;
	90	else
	91	{
	92	if (enc)
	93	enc = 1;
	94	ctx->encrypt = enc;
	95	}
11a57c7b GT	96	/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
	97	* so this context may already have an ENGINE! Try to avoid releasing
	98	* the previous handle, re-querying for an ENGINE, and having a
	99	* reinitialisation, when it may all be unecessary. */
	100	if (ctx->engine && ctx->cipher && (!cipher \|\|
	101	(cipher && (cipher->nid == ctx->cipher->nid))))
	102	goto skip_to_init;
dbad1690 BL	103	if (cipher)
dbad1690 BL	104	{
11a57c7b GT	105	/* Ensure an ENGINE left lying around from last time is cleared
	106	* (the previous check attempted to avoid this if the same
	107	* ENGINE and EVP_CIPHER could be used). */
	108	if(ctx->engine)
	109	ENGINE_finish(ctx->engine);
bf6a9e66 DSH	110	if(impl)
	111	{
	112	if (!ENGINE_init(impl))
	113	{
	114	EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
	115	return 0;
	116	}
	117	}
	118	else
11a57c7b GT	119	/* Ask if an ENGINE is reserved for this job */
	120	impl = ENGINE_get_cipher_engine(cipher->nid);
	121	if(impl)
	122	{
	123	/* There's an ENGINE for this job ... (apparently) */
	124	const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
	125	if(!c)
	126	{
	127	/* One positive side-effect of US's export
	128	* control history, is that we should at least
	129	* be able to avoid using US mispellings of
	130	* "initialisation"? */
	131	EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
	132	return 0;
	133	}
	134	/* We'll use the ENGINE's private cipher definition */
	135	cipher = c;
	136	/* Store the ENGINE functional reference so we know
	137	* 'cipher' came from an ENGINE and we need to release
	138	* it when done. */
	139	ctx->engine = impl;
	140	}
	141	else
	142	ctx->engine = NULL;
360370d9	143	ctx->cipher=cipher;
dbad1690	144	ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
360370d9	145	ctx->key_len = cipher->key_len;
f2e5ca84	146	ctx->flags = 0;
11a57c7b GT	147	if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
	148	{
	149	if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
	150	{
49528751 DSH	151	EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
49528751 DSH	152	return 0;
11a57c7b	153	}
49528751 DSH	154	}
49528751 DSH	155	}
11a57c7b GT	156	else if(!ctx->cipher)
11a57c7b GT	157	{
360370d9 DSH	158	EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
360370d9 DSH	159	return 0;
11a57c7b GT	160	}
11a57c7b GT	161	skip_to_init:
f31b1250 BL	162	/* we assume block size is a power of 2 in cryptUpdate /
	163	assert(ctx->cipher->block_size == 1
	164	\|\| ctx->cipher->block_size == 8
	165	\|\| ctx->cipher->block_size == 16);
	166
360370d9 DSH	167	if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
	168	switch(EVP_CIPHER_CTX_mode(ctx)) {
	169
	170	case EVP_CIPH_STREAM_CIPHER:
	171	case EVP_CIPH_ECB_MODE:
	172	break;
	173
	174	case EVP_CIPH_CFB_MODE:
	175	case EVP_CIPH_OFB_MODE:
	176
	177	ctx->num = 0;
	178
	179	case EVP_CIPH_CBC_MODE:
	180
	181	if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
	182	memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
	183	break;
	184
	185	default:
	186	return 0;
	187	break;
	188	}
	189	}
	190
	191	if(key \|\| (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
	192	if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
	193	}
360370d9	194	ctx->buf_len=0;
c148d709 BL	195	ctx->final_used=0;
c148d709 BL	196	ctx->block_mask=ctx->cipher->block_size-1;
360370d9	197	return 1;
d02b48c6 RE	198	}
d02b48c6 RE	199
be06a934	200	int EVP_CipherUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
0e360199	201	const unsigned char *in, int inl)
d02b48c6 RE	202	{
d02b48c6 RE	203	if (ctx->encrypt)
be06a934 DSH	204	return EVP_EncryptUpdate(ctx,out,outl,in,inl);
be06a934 DSH	205	else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
d02b48c6 RE	206	}
d02b48c6 RE	207
581f1c84 DSH	208	int EVP_CipherFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
	209	{
	210	if (ctx->encrypt)
	211	return EVP_EncryptFinal_ex(ctx,out,outl);
	212	else return EVP_DecryptFinal_ex(ctx,out,outl);
	213	}
	214
6b691a5c	215	int EVP_CipherFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
d02b48c6 RE	216	{
d02b48c6 RE	217	if (ctx->encrypt)
be06a934	218	return EVP_EncryptFinal(ctx,out,outl);
11a57c7b	219	else return EVP_DecryptFinal(ctx,out,outl);
d02b48c6 RE	220	}
d02b48c6 RE	221
be06a934	222	int EVP_EncryptInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0e360199	223	const unsigned char key, const unsigned char iv)
d02b48c6	224	{
581f1c84	225	return EVP_CipherInit(ctx, cipher, key, iv, 1);
18eda732 GT	226	}
	227
	228	int EVP_EncryptInit_ex(EVP_CIPHER_CTX ctx,const EVP_CIPHER cipher, ENGINE *impl,
	229	const unsigned char key, const unsigned char iv)
	230	{
	231	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
d02b48c6 RE	232	}
d02b48c6 RE	233
be06a934	234	int EVP_DecryptInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0e360199	235	const unsigned char key, const unsigned char iv)
d02b48c6	236	{
18eda732 GT	237	return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, 0);
	238	}
	239
	240	int EVP_DecryptInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher, ENGINE *impl,
	241	const unsigned char key, const unsigned char iv)
	242	{
	243	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
d02b48c6 RE	244	}
d02b48c6 RE	245
be06a934	246	int EVP_EncryptUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
0e360199	247	const unsigned char *in, int inl)
d02b48c6 RE	248	{
	249	int i,j,bl;
	250
c148d709	251	if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
7b6055d1 BL	252	{
	253	if(ctx->cipher->do_cipher(ctx,out,in,inl))
	254	{
	255	*outl=inl;
	256	return 1;
	257	}
	258	else
	259	{
	260	*outl=0;
	261	return 0;
	262	}
	263	}
c148d709 BL	264	i=ctx->buf_len;
c148d709 BL	265	bl=ctx->cipher->block_size;
d02b48c6 RE	266	if (i != 0)
	267	{
	268	if (i+inl < bl)
	269	{
	270	memcpy(&(ctx->buf[i]),in,inl);
	271	ctx->buf_len+=inl;
c148d709	272	*outl=0;
be06a934	273	return 1;
d02b48c6 RE	274	}
	275	else
	276	{
	277	j=bl-i;
c148d709	278	memcpy(&(ctx->buf[i]),in,j);
be06a934	279	if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
d02b48c6 RE	280	inl-=j;
	281	in+=j;
	282	out+=bl;
c148d709	283	*outl=bl;
d02b48c6 RE	284	}
d02b48c6 RE	285	}
dc706cd3 DSH	286	else
dc706cd3 DSH	287	*outl = 0;
f31b1250	288	i=inl&(bl-1);
d02b48c6 RE	289	inl-=i;
	290	if (inl > 0)
	291	{
be06a934	292	if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
d02b48c6 RE	293	*outl+=inl;
	294	}
	295
	296	if (i != 0)
	297	memcpy(ctx->buf,&(in[inl]),i);
	298	ctx->buf_len=i;
be06a934	299	return 1;
d02b48c6 RE	300	}
d02b48c6 RE	301
be06a934	302	int EVP_EncryptFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
581f1c84 DSH	303	{
	304	int ret;
	305	ret = EVP_EncryptFinal_ex(ctx, out, outl);
	306	EVP_CIPHER_CTX_cleanup(ctx);
	307	return ret;
	308	}
	309
	310	int EVP_EncryptFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
d02b48c6	311	{
f0446ca8	312	int i,n,b,bl,ret;
d02b48c6 RE	313
	314	b=ctx->cipher->block_size;
	315	if (b == 1)
	316	{
82b22305	317	EVP_CIPHER_CTX_cleanup(ctx);
d02b48c6	318	*outl=0;
be06a934	319	return 1;
d02b48c6 RE	320	}
d02b48c6 RE	321	bl=ctx->buf_len;
f2e5ca84 DSH	322	if (ctx->flags & EVP_CIPH_NO_PADDING)
f2e5ca84 DSH	323	{
f0446ca8	324	EVP_CIPHER_CTX_cleanup(ctx);
f2e5ca84 DSH	325	if(bl)
	326	{
	327	EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
	328	return 0;
	329	}
	330	*outl = 0;
	331	return 1;
	332	}
f0446ca8	333
d02b48c6 RE	334	n=b-bl;
	335	for (i=bl; i<b; i++)
	336	ctx->buf[i]=n;
f0446ca8 BL	337	ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
	338
	339	EVP_CIPHER_CTX_cleanup(ctx);
	340
	341	if(ret)
	342	*outl=b;
	343
	344	return ret;
d02b48c6 RE	345	}
d02b48c6 RE	346
be06a934	347	int EVP_DecryptUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
0e360199	348	const unsigned char *in, int inl)
d02b48c6	349	{
f329b8d7	350	int b, fix_len;
d02b48c6	351
c148d709 BL	352	if (inl == 0)
	353	{
	354	*outl=0;
	355	return 1;
	356	}
d02b48c6	357
f2e5ca84 DSH	358	if (ctx->flags & EVP_CIPH_NO_PADDING)
	359	return EVP_EncryptUpdate(ctx, out, outl, in, inl);
	360
d02b48c6	361	b=ctx->cipher->block_size;
f329b8d7	362
c148d709	363	if(ctx->final_used)
d02b48c6	364	{
c148d709 BL	365	memcpy(out,ctx->final,b);
c148d709 BL	366	out+=b;
f329b8d7	367	fix_len = 1;
d02b48c6	368	}
f329b8d7 DSH	369	else
	370	fix_len = 0;
	371
	372
c148d709 BL	373	if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
c148d709 BL	374	return 0;
d02b48c6 RE	375
	376	/* if we have 'decrypted' a multiple of block size, make sure
	377	* we have a copy of this last block */
c148d709	378	if (b > 1 && !ctx->buf_len)
d02b48c6	379	{
f329b8d7 DSH	380	*outl-=b;
f329b8d7 DSH	381	ctx->final_used=1;
c148d709 BL	382	memcpy(ctx->final,&out[*outl],b);
c148d709 BL	383	}
f329b8d7 DSH	384	else
	385	ctx->final_used = 0;
	386
	387	if (fix_len)
	388	*outl += b;
	389
be06a934	390	return 1;
d02b48c6 RE	391	}
d02b48c6 RE	392
6b691a5c	393	int EVP_DecryptFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
581f1c84 DSH	394	{
	395	int ret;
	396	ret = EVP_DecryptFinal_ex(ctx, out, outl);
	397	EVP_CIPHER_CTX_cleanup(ctx);
	398	return ret;
	399	}
	400
	401	int EVP_DecryptFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
d02b48c6 RE	402	{
	403	int i,b;
	404	int n;
	405
	406	*outl=0;
	407	b=ctx->cipher->block_size;
f2e5ca84 DSH	408	if (ctx->flags & EVP_CIPH_NO_PADDING)
f2e5ca84 DSH	409	{
82b22305	410	EVP_CIPHER_CTX_cleanup(ctx);
f2e5ca84 DSH	411	if(ctx->buf_len)
	412	{
	413	EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
	414	return 0;
	415	}
	416	*outl = 0;
	417	return 1;
	418	}
d02b48c6 RE	419	if (b > 1)
d02b48c6 RE	420	{
c148d709	421	if (ctx->buf_len \|\| !ctx->final_used)
d02b48c6	422	{
82b22305	423	EVP_CIPHER_CTX_cleanup(ctx);
d02b48c6 RE	424	EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
	425	return(0);
	426	}
c148d709	427	n=ctx->final[b-1];
d02b48c6 RE	428	if (n > b)
d02b48c6 RE	429	{
82b22305	430	EVP_CIPHER_CTX_cleanup(ctx);
d02b48c6 RE	431	EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
	432	return(0);
	433	}
	434	for (i=0; i<n; i++)
	435	{
c148d709	436	if (ctx->final[--b] != n)
d02b48c6	437	{
82b22305	438	EVP_CIPHER_CTX_cleanup(ctx);
d02b48c6 RE	439	EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
	440	return(0);
	441	}
	442	}
	443	n=ctx->cipher->block_size-n;
	444	for (i=0; i<n; i++)
c148d709	445	out[i]=ctx->final[i];
d02b48c6 RE	446	*outl=n;
	447	}
	448	else
	449	*outl=0;
82b22305	450	EVP_CIPHER_CTX_cleanup(ctx);
d02b48c6 RE	451	return(1);
	452	}
	453
be06a934	454	int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
d02b48c6 RE	455	{
d02b48c6 RE	456	if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
be06a934 DSH	457	{
	458	if(!c->cipher->cleanup(c)) return 0;
	459	}
dbad1690	460	OPENSSL_free(c->cipher_data);
11a57c7b GT	461	if (c->engine)
	462	/* The EVP_CIPHER we used belongs to an ENGINE, release the
	463	* functional reference we held for this reason. */
	464	ENGINE_finish(c->engine);
d02b48c6	465	memset(c,0,sizeof(EVP_CIPHER_CTX));
be06a934	466	return 1;
d02b48c6 RE	467	}
d02b48c6 RE	468
7f060601 DSH	469	int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
7f060601 DSH	470	{
49528751 DSH	471	if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
49528751 DSH	472	return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
7f060601 DSH	473	if(c->key_len == keylen) return 1;
	474	if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
	475	{
	476	c->key_len = keylen;
	477	return 1;
	478	}
	479	EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
	480	return 0;
	481	}
49528751	482
f2e5ca84 DSH	483	int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
	484	{
	485	if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
	486	else ctx->flags \|= EVP_CIPH_NO_PADDING;
	487	return 1;
	488	}
	489
49528751 DSH	490	int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX ctx, int type, int arg, void ptr)
	491	{
	492	int ret;
	493	if(!ctx->cipher) {
	494	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
	495	return 0;
	496	}
	497
	498	if(!ctx->cipher->ctrl) {
	499	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
	500	return 0;
	501	}
	502
	503	ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
	504	if(ret == -1) {
	505	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
	506	return 0;
	507	}
	508	return ret;
	509	}