[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"

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 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;
		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 */
	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) <= 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;
		}
	}

	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(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;

	OPENSSL_assert(inl > 0);
	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;
	OPENSSL_assert(bl <= 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(!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);
	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;
	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,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);


	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;
	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,b;
	int n;

	*outl=0;
	b=ctx->cipher->block_size;
	if (ctx->flags & EVP_CIPH_NO_PADDING)
		{
		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)
			{
			EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
			return(0);
			}
		OPENSSL_assert(b <= sizeof ctx->final);
		n=ctx->final[b-1];
		if (n > b)
			{
			EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
			return(0);
			}
		for (i=0; i<n; i++)
			{
			if (ctx->final[--b] != n)
				{
				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;
	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);
	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
e778802f	66	const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
58964a49	67
6b691a5c	68	void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
58964a49 RE	69	{
	70	memset(ctx,0,sizeof(EVP_CIPHER_CTX));
	71	/* ctx->cipher=NULL; */
	72	}
d02b48c6	73
581f1c84	74
360370d9	75	int EVP_CipherInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0e360199	76	const unsigned char key, const unsigned char iv, int enc)
d02b48c6	77	{
a3829cb7 DSH	78	if (cipher)
a3829cb7 DSH	79	EVP_CIPHER_CTX_init(ctx);
11a57c7b GT	80	return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
11a57c7b GT	81	}
581f1c84	82
11a57c7b GT	83	int EVP_CipherInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher, ENGINE *impl,
	84	const unsigned char key, const unsigned char iv, int enc)
	85	{
3e268d27 DSH	86	if (enc == -1)
	87	enc = ctx->encrypt;
	88	else
	89	{
	90	if (enc)
	91	enc = 1;
	92	ctx->encrypt = enc;
	93	}
11a57c7b GT	94	/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
	95	* so this context may already have an ENGINE! Try to avoid releasing
	96	* the previous handle, re-querying for an ENGINE, and having a
	97	* reinitialisation, when it may all be unecessary. */
	98	if (ctx->engine && ctx->cipher && (!cipher \|\|
	99	(cipher && (cipher->nid == ctx->cipher->nid))))
	100	goto skip_to_init;
dbad1690 BL	101	if (cipher)
dbad1690 BL	102	{
544a2aea	103	/* Ensure a context left lying around from last time is cleared
11a57c7b GT	104	* (the previous check attempted to avoid this if the same
11a57c7b GT	105	* ENGINE and EVP_CIPHER could be used). */
544a2aea DSH	106	EVP_CIPHER_CTX_cleanup(ctx);
	107
	108	/* Restore encrypt field: it is zeroed by cleanup */
	109	ctx->encrypt = enc;
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;
544a2aea	143
360370d9	144	ctx->cipher=cipher;
dbad1690	145	ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
360370d9	146	ctx->key_len = cipher->key_len;
f2e5ca84	147	ctx->flags = 0;
11a57c7b GT	148	if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
	149	{
	150	if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
	151	{
49528751 DSH	152	EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
49528751 DSH	153	return 0;
11a57c7b	154	}
49528751 DSH	155	}
49528751 DSH	156	}
11a57c7b GT	157	else if(!ctx->cipher)
11a57c7b GT	158	{
360370d9 DSH	159	EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
360370d9 DSH	160	return 0;
11a57c7b GT	161	}
11a57c7b GT	162	skip_to_init:
f31b1250	163	/* we assume block size is a power of 2 in cryptUpdate /
54a656ef BL	164	OPENSSL_assert(ctx->cipher->block_size == 1
	165	\|\| ctx->cipher->block_size == 8
	166	\|\| ctx->cipher->block_size == 16);
f31b1250	167
360370d9 DSH	168	if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
	169	switch(EVP_CIPHER_CTX_mode(ctx)) {
	170
	171	case EVP_CIPH_STREAM_CIPHER:
	172	case EVP_CIPH_ECB_MODE:
	173	break;
	174
	175	case EVP_CIPH_CFB_MODE:
	176	case EVP_CIPH_OFB_MODE:
	177
	178	ctx->num = 0;
	179
	180	case EVP_CIPH_CBC_MODE:
	181
54a656ef	182	OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= sizeof ctx->iv);
360370d9 DSH	183	if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
	184	memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
	185	break;
	186
	187	default:
	188	return 0;
	189	break;
	190	}
	191	}
	192
	193	if(key \|\| (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
	194	if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
	195	}
360370d9	196	ctx->buf_len=0;
c148d709 BL	197	ctx->final_used=0;
c148d709 BL	198	ctx->block_mask=ctx->cipher->block_size-1;
360370d9	199	return 1;
d02b48c6 RE	200	}
d02b48c6 RE	201
be06a934	202	int EVP_CipherUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
0e360199	203	const unsigned char *in, int inl)
d02b48c6 RE	204	{
d02b48c6 RE	205	if (ctx->encrypt)
be06a934 DSH	206	return EVP_EncryptUpdate(ctx,out,outl,in,inl);
be06a934 DSH	207	else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
d02b48c6 RE	208	}
d02b48c6 RE	209
581f1c84 DSH	210	int EVP_CipherFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
	211	{
	212	if (ctx->encrypt)
	213	return EVP_EncryptFinal_ex(ctx,out,outl);
	214	else return EVP_DecryptFinal_ex(ctx,out,outl);
	215	}
	216
6b691a5c	217	int EVP_CipherFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
d02b48c6 RE	218	{
d02b48c6 RE	219	if (ctx->encrypt)
be06a934	220	return EVP_EncryptFinal(ctx,out,outl);
11a57c7b	221	else return EVP_DecryptFinal(ctx,out,outl);
d02b48c6 RE	222	}
d02b48c6 RE	223
be06a934	224	int EVP_EncryptInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0e360199	225	const unsigned char key, const unsigned char iv)
d02b48c6	226	{
581f1c84	227	return EVP_CipherInit(ctx, cipher, key, iv, 1);
18eda732 GT	228	}
	229
	230	int EVP_EncryptInit_ex(EVP_CIPHER_CTX ctx,const EVP_CIPHER cipher, ENGINE *impl,
	231	const unsigned char key, const unsigned char iv)
	232	{
	233	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
d02b48c6 RE	234	}
d02b48c6 RE	235
be06a934	236	int EVP_DecryptInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0e360199	237	const unsigned char key, const unsigned char iv)
d02b48c6	238	{
59ae8c94	239	return EVP_CipherInit(ctx, cipher, key, iv, 0);
18eda732 GT	240	}
	241
	242	int EVP_DecryptInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher, ENGINE *impl,
	243	const unsigned char key, const unsigned char iv)
	244	{
	245	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
d02b48c6 RE	246	}
d02b48c6 RE	247
be06a934	248	int EVP_EncryptUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
0e360199	249	const unsigned char *in, int inl)
d02b48c6 RE	250	{
	251	int i,j,bl;
	252
54a656ef	253	OPENSSL_assert(inl > 0);
c148d709	254	if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
7b6055d1 BL	255	{
	256	if(ctx->cipher->do_cipher(ctx,out,in,inl))
	257	{
	258	*outl=inl;
	259	return 1;
	260	}
	261	else
	262	{
	263	*outl=0;
	264	return 0;
	265	}
	266	}
c148d709 BL	267	i=ctx->buf_len;
c148d709 BL	268	bl=ctx->cipher->block_size;
54a656ef	269	OPENSSL_assert(bl <= sizeof ctx->buf);
d02b48c6 RE	270	if (i != 0)
	271	{
	272	if (i+inl < bl)
	273	{
	274	memcpy(&(ctx->buf[i]),in,inl);
	275	ctx->buf_len+=inl;
c148d709	276	*outl=0;
be06a934	277	return 1;
d02b48c6 RE	278	}
	279	else
	280	{
	281	j=bl-i;
c148d709	282	memcpy(&(ctx->buf[i]),in,j);
be06a934	283	if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
d02b48c6 RE	284	inl-=j;
	285	in+=j;
	286	out+=bl;
c148d709	287	*outl=bl;
d02b48c6 RE	288	}
d02b48c6 RE	289	}
dc706cd3 DSH	290	else
dc706cd3 DSH	291	*outl = 0;
f31b1250	292	i=inl&(bl-1);
d02b48c6 RE	293	inl-=i;
	294	if (inl > 0)
	295	{
be06a934	296	if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
d02b48c6 RE	297	*outl+=inl;
	298	}
	299
	300	if (i != 0)
	301	memcpy(ctx->buf,&(in[inl]),i);
	302	ctx->buf_len=i;
be06a934	303	return 1;
d02b48c6 RE	304	}
d02b48c6 RE	305
be06a934	306	int EVP_EncryptFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
581f1c84 DSH	307	{
	308	int ret;
	309	ret = EVP_EncryptFinal_ex(ctx, out, outl);
581f1c84 DSH	310	return ret;
	311	}
	312
	313	int EVP_EncryptFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
d02b48c6	314	{
f0446ca8	315	int i,n,b,bl,ret;
d02b48c6 RE	316
d02b48c6 RE	317	b=ctx->cipher->block_size;
54a656ef	318	OPENSSL_assert(b <= sizeof ctx->buf);
d02b48c6 RE	319	if (b == 1)
	320	{
	321	*outl=0;
be06a934	322	return 1;
d02b48c6 RE	323	}
d02b48c6 RE	324	bl=ctx->buf_len;
f2e5ca84 DSH	325	if (ctx->flags & EVP_CIPH_NO_PADDING)
	326	{
	327	if(bl)
	328	{
	329	EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
	330	return 0;
	331	}
	332	*outl = 0;
	333	return 1;
	334	}
f0446ca8	335
d02b48c6 RE	336	n=b-bl;
	337	for (i=bl; i<b; i++)
	338	ctx->buf[i]=n;
f0446ca8 BL	339	ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
f0446ca8 BL	340
f0446ca8 BL	341
	342	if(ret)
	343	*outl=b;
	344
	345	return ret;
d02b48c6 RE	346	}
d02b48c6 RE	347
be06a934	348	int EVP_DecryptUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
0e360199	349	const unsigned char *in, int inl)
d02b48c6	350	{
f329b8d7	351	int b, fix_len;
d02b48c6	352
c148d709 BL	353	if (inl == 0)
	354	{
	355	*outl=0;
	356	return 1;
	357	}
d02b48c6	358
f2e5ca84 DSH	359	if (ctx->flags & EVP_CIPH_NO_PADDING)
	360	return EVP_EncryptUpdate(ctx, out, outl, in, inl);
	361
d02b48c6	362	b=ctx->cipher->block_size;
54a656ef	363	OPENSSL_assert(b <= sizeof ctx->final);
f329b8d7	364
c148d709	365	if(ctx->final_used)
d02b48c6	366	{
c148d709 BL	367	memcpy(out,ctx->final,b);
c148d709 BL	368	out+=b;
f329b8d7	369	fix_len = 1;
d02b48c6	370	}
f329b8d7 DSH	371	else
	372	fix_len = 0;
	373
	374
c148d709 BL	375	if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
c148d709 BL	376	return 0;
d02b48c6 RE	377
	378	/* if we have 'decrypted' a multiple of block size, make sure
	379	* we have a copy of this last block */
c148d709	380	if (b > 1 && !ctx->buf_len)
d02b48c6	381	{
f329b8d7 DSH	382	*outl-=b;
f329b8d7 DSH	383	ctx->final_used=1;
c148d709 BL	384	memcpy(ctx->final,&out[*outl],b);
c148d709 BL	385	}
f329b8d7 DSH	386	else
	387	ctx->final_used = 0;
	388
	389	if (fix_len)
	390	*outl += b;
	391
be06a934	392	return 1;
d02b48c6 RE	393	}
d02b48c6 RE	394
6b691a5c	395	int EVP_DecryptFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
581f1c84 DSH	396	{
	397	int ret;
	398	ret = EVP_DecryptFinal_ex(ctx, out, outl);
581f1c84 DSH	399	return ret;
	400	}
	401
	402	int EVP_DecryptFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
d02b48c6 RE	403	{
	404	int i,b;
	405	int n;
	406
	407	*outl=0;
	408	b=ctx->cipher->block_size;
f2e5ca84 DSH	409	if (ctx->flags & EVP_CIPH_NO_PADDING)
	410	{
	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 RE	422	{
	423	EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
	424	return(0);
	425	}
54a656ef	426	OPENSSL_assert(b <= sizeof ctx->final);
c148d709	427	n=ctx->final[b-1];
d02b48c6 RE	428	if (n > b)
	429	{
	430	EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
	431	return(0);
	432	}
	433	for (i=0; i<n; i++)
	434	{
c148d709	435	if (ctx->final[--b] != n)
d02b48c6 RE	436	{
	437	EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
	438	return(0);
	439	}
	440	}
	441	n=ctx->cipher->block_size-n;
	442	for (i=0; i<n; i++)
c148d709	443	out[i]=ctx->final[i];
d02b48c6 RE	444	*outl=n;
	445	}
	446	else
	447	*outl=0;
	448	return(1);
	449	}
	450
be06a934	451	int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
d02b48c6	452	{
544a2aea	453	if (c->cipher != NULL)
be06a934	454	{
544a2aea DSH	455	if(c->cipher->cleanup && !c->cipher->cleanup(c))
544a2aea DSH	456	return 0;
43d60164	457	/* Cleanse cipher context data */
544a2aea	458	if (c->cipher_data)
43d60164	459	OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
be06a934	460	}
544a2aea DSH	461	if (c->cipher_data)
544a2aea DSH	462	OPENSSL_free(c->cipher_data);
11a57c7b GT	463	if (c->engine)
	464	/* The EVP_CIPHER we used belongs to an ENGINE, release the
	465	* functional reference we held for this reason. */
	466	ENGINE_finish(c->engine);
d02b48c6	467	memset(c,0,sizeof(EVP_CIPHER_CTX));
be06a934	468	return 1;
d02b48c6 RE	469	}
d02b48c6 RE	470
7f060601 DSH	471	int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
7f060601 DSH	472	{
49528751 DSH	473	if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
49528751 DSH	474	return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
7f060601 DSH	475	if(c->key_len == keylen) return 1;
	476	if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
	477	{
	478	c->key_len = keylen;
	479	return 1;
	480	}
	481	EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
	482	return 0;
	483	}
49528751	484
f2e5ca84 DSH	485	int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
	486	{
	487	if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
	488	else ctx->flags \|= EVP_CIPH_NO_PADDING;
	489	return 1;
	490	}
	491
49528751 DSH	492	int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX ctx, int type, int arg, void ptr)
	493	{
	494	int ret;
	495	if(!ctx->cipher) {
	496	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
	497	return 0;
	498	}
	499
	500	if(!ctx->cipher->ctrl) {
	501	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
	502	return 0;
	503	}
	504
	505	ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
	506	if(ret == -1) {
	507	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
	508	return 0;
	509	}
	510	return ret;
	511	}