[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/rand.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#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; */
	}

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_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;
		}
#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(impl)
			{
			if (!ENGINE_init(impl))
				{
				EVPerr(EVP_F_EVP_CIPHERINIT_EX, 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_EX, 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;
#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_ENGINE
skip_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;
		}
	}

	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, size_t 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, size_t inl)
	{
	size_t i;
	size_t bl;
	size_t j;

	if (inl <= 0)
		{
		*outl = 0;
		return 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 <= (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(!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 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=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, size_t 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_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. */
		ENGINE_finish(c->engine);
#endif
	memset(c,0,sizeof(EVP_CIPHER_CTX));
	return 1;
	}

int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, size_t keylen)
	{
	if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) 
	    return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, (int)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;
}

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;
	}
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>
3a87a9b9	63	#include <openssl/rand.h>
0b13e9f0	64	#ifndef OPENSSL_NO_ENGINE
11a57c7b	65	#include <openssl/engine.h>
0b13e9f0	66	#endif
57ae2e24	67	#include "evp_locl.h"
d02b48c6	68
560b79cb	69	const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT;
58964a49	70
6b691a5c	71	void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
58964a49 RE	72	{
	73	memset(ctx,0,sizeof(EVP_CIPHER_CTX));
	74	/* ctx->cipher=NULL; */
	75	}
d02b48c6	76
b40228a6 DSH	77	EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
	78	{
	79	EVP_CIPHER_CTX ctx=OPENSSL_malloc(sizeof ctx);
	80	if (ctx)
	81	EVP_CIPHER_CTX_init(ctx);
	82	return ctx;
	83	}
581f1c84	84
360370d9	85	int EVP_CipherInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0e360199	86	const unsigned char key, const unsigned char iv, int enc)
d02b48c6	87	{
a3829cb7 DSH	88	if (cipher)
a3829cb7 DSH	89	EVP_CIPHER_CTX_init(ctx);
11a57c7b GT	90	return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
11a57c7b GT	91	}
581f1c84	92
11a57c7b GT	93	int EVP_CipherInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher, ENGINE *impl,
	94	const unsigned char key, const unsigned char iv, int enc)
	95	{
3e268d27 DSH	96	if (enc == -1)
	97	enc = ctx->encrypt;
	98	else
	99	{
	100	if (enc)
	101	enc = 1;
	102	ctx->encrypt = enc;
	103	}
0b13e9f0	104	#ifndef OPENSSL_NO_ENGINE
11a57c7b GT	105	/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
	106	* so this context may already have an ENGINE! Try to avoid releasing
	107	* the previous handle, re-querying for an ENGINE, and having a
	108	* reinitialisation, when it may all be unecessary. */
	109	if (ctx->engine && ctx->cipher && (!cipher \|\|
	110	(cipher && (cipher->nid == ctx->cipher->nid))))
	111	goto skip_to_init;
0b13e9f0	112	#endif
dbad1690 BL	113	if (cipher)
dbad1690 BL	114	{
544a2aea	115	/* Ensure a context left lying around from last time is cleared
11a57c7b GT	116	* (the previous check attempted to avoid this if the same
11a57c7b GT	117	* ENGINE and EVP_CIPHER could be used). */
544a2aea DSH	118	EVP_CIPHER_CTX_cleanup(ctx);
	119
	120	/* Restore encrypt field: it is zeroed by cleanup */
	121	ctx->encrypt = enc;
0b13e9f0	122	#ifndef OPENSSL_NO_ENGINE
bf6a9e66 DSH	123	if(impl)
	124	{
	125	if (!ENGINE_init(impl))
	126	{
8afca8d9	127	EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
bf6a9e66 DSH	128	return 0;
	129	}
	130	}
	131	else
11a57c7b GT	132	/* Ask if an ENGINE is reserved for this job */
	133	impl = ENGINE_get_cipher_engine(cipher->nid);
	134	if(impl)
	135	{
	136	/* There's an ENGINE for this job ... (apparently) */
	137	const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
	138	if(!c)
	139	{
	140	/* One positive side-effect of US's export
	141	* control history, is that we should at least
	142	* be able to avoid using US mispellings of
	143	* "initialisation"? */
8afca8d9	144	EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
11a57c7b GT	145	return 0;
	146	}
	147	/* We'll use the ENGINE's private cipher definition */
	148	cipher = c;
	149	/* Store the ENGINE functional reference so we know
	150	* 'cipher' came from an ENGINE and we need to release
	151	* it when done. */
	152	ctx->engine = impl;
	153	}
	154	else
	155	ctx->engine = NULL;
0b13e9f0	156	#endif
544a2aea	157
360370d9	158	ctx->cipher=cipher;
2fe9ab8e	159	if (ctx->cipher->ctx_size)
1145e038	160	{
2fe9ab8e RL	161	ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
	162	if (!ctx->cipher_data)
	163	{
8afca8d9	164	EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
2fe9ab8e RL	165	return 0;
	166	}
	167	}
	168	else
	169	{
	170	ctx->cipher_data = NULL;
1145e038	171	}
360370d9	172	ctx->key_len = cipher->key_len;
f2e5ca84	173	ctx->flags = 0;
11a57c7b GT	174	if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
	175	{
	176	if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
	177	{
8afca8d9	178	EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
49528751	179	return 0;
11a57c7b	180	}
49528751 DSH	181	}
49528751 DSH	182	}
11a57c7b GT	183	else if(!ctx->cipher)
11a57c7b GT	184	{
8afca8d9	185	EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
360370d9	186	return 0;
11a57c7b	187	}
0b13e9f0	188	#ifndef OPENSSL_NO_ENGINE
11a57c7b	189	skip_to_init:
0b13e9f0	190	#endif
f31b1250	191	/* we assume block size is a power of 2 in cryptUpdate /
54a656ef BL	192	OPENSSL_assert(ctx->cipher->block_size == 1
	193	\|\| ctx->cipher->block_size == 8
	194	\|\| ctx->cipher->block_size == 16);
f31b1250	195
360370d9 DSH	196	if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
	197	switch(EVP_CIPHER_CTX_mode(ctx)) {
	198
	199	case EVP_CIPH_STREAM_CIPHER:
	200	case EVP_CIPH_ECB_MODE:
	201	break;
	202
	203	case EVP_CIPH_CFB_MODE:
	204	case EVP_CIPH_OFB_MODE:
	205
	206	ctx->num = 0;
	207
	208	case EVP_CIPH_CBC_MODE:
	209
27545970 GT	210	OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
27545970 GT	211	(int)sizeof(ctx->iv));
5e4430e7 BL	212	if(iv) memcpy(ctx->oiv, iv,
5e4430e7 BL	213	EVP_CIPHER_CTX_iv_length(ctx));
360370d9 DSH	214	memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
	215	break;
	216
	217	default:
	218	return 0;
	219	break;
	220	}
	221	}
	222
	223	if(key \|\| (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
	224	if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
	225	}
360370d9	226	ctx->buf_len=0;
c148d709 BL	227	ctx->final_used=0;
c148d709 BL	228	ctx->block_mask=ctx->cipher->block_size-1;
360370d9	229	return 1;
d02b48c6 RE	230	}
d02b48c6 RE	231
be06a934	232	int EVP_CipherUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
5e4430e7	233	const unsigned char *in, size_t inl)
d02b48c6 RE	234	{
d02b48c6 RE	235	if (ctx->encrypt)
be06a934 DSH	236	return EVP_EncryptUpdate(ctx,out,outl,in,inl);
be06a934 DSH	237	else return EVP_DecryptUpdate(ctx,out,outl,in,inl);
d02b48c6 RE	238	}
d02b48c6 RE	239
581f1c84 DSH	240	int EVP_CipherFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
	241	{
	242	if (ctx->encrypt)
	243	return EVP_EncryptFinal_ex(ctx,out,outl);
	244	else return EVP_DecryptFinal_ex(ctx,out,outl);
	245	}
	246
6b691a5c	247	int EVP_CipherFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
d02b48c6 RE	248	{
d02b48c6 RE	249	if (ctx->encrypt)
be06a934	250	return EVP_EncryptFinal(ctx,out,outl);
11a57c7b	251	else return EVP_DecryptFinal(ctx,out,outl);
d02b48c6 RE	252	}
d02b48c6 RE	253
be06a934	254	int EVP_EncryptInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0e360199	255	const unsigned char key, const unsigned char iv)
d02b48c6	256	{
581f1c84	257	return EVP_CipherInit(ctx, cipher, key, iv, 1);
18eda732 GT	258	}
	259
	260	int EVP_EncryptInit_ex(EVP_CIPHER_CTX ctx,const EVP_CIPHER cipher, ENGINE *impl,
	261	const unsigned char key, const unsigned char iv)
	262	{
	263	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
d02b48c6 RE	264	}
d02b48c6 RE	265
be06a934	266	int EVP_DecryptInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0e360199	267	const unsigned char key, const unsigned char iv)
d02b48c6	268	{
59ae8c94	269	return EVP_CipherInit(ctx, cipher, key, iv, 0);
18eda732 GT	270	}
	271
	272	int EVP_DecryptInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher, ENGINE *impl,
	273	const unsigned char key, const unsigned char iv)
	274	{
	275	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
d02b48c6 RE	276	}
d02b48c6 RE	277
be06a934	278	int EVP_EncryptUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
5e4430e7	279	const unsigned char *in, size_t inl)
d02b48c6	280	{
5e4430e7 BL	281	size_t i;
	282	size_t bl;
	283	size_t j;
d02b48c6	284
2e415778 BM	285	if (inl <= 0)
	286	{
	287	*outl = 0;
	288	return inl == 0;
	289	}
	290
c148d709	291	if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
7b6055d1 BL	292	{
	293	if(ctx->cipher->do_cipher(ctx,out,in,inl))
	294	{
	295	*outl=inl;
	296	return 1;
	297	}
	298	else
	299	{
	300	*outl=0;
	301	return 0;
	302	}
	303	}
c148d709 BL	304	i=ctx->buf_len;
c148d709 BL	305	bl=ctx->cipher->block_size;
27545970	306	OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
d02b48c6 RE	307	if (i != 0)
	308	{
	309	if (i+inl < bl)
	310	{
	311	memcpy(&(ctx->buf[i]),in,inl);
	312	ctx->buf_len+=inl;
c148d709	313	*outl=0;
be06a934	314	return 1;
d02b48c6 RE	315	}
	316	else
	317	{
	318	j=bl-i;
c148d709	319	memcpy(&(ctx->buf[i]),in,j);
be06a934	320	if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
d02b48c6 RE	321	inl-=j;
	322	in+=j;
	323	out+=bl;
c148d709	324	*outl=bl;
d02b48c6 RE	325	}
d02b48c6 RE	326	}
dc706cd3 DSH	327	else
dc706cd3 DSH	328	*outl = 0;
f31b1250	329	i=inl&(bl-1);
d02b48c6 RE	330	inl-=i;
	331	if (inl > 0)
	332	{
be06a934	333	if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
d02b48c6 RE	334	*outl+=inl;
	335	}
	336
	337	if (i != 0)
	338	memcpy(ctx->buf,&(in[inl]),i);
	339	ctx->buf_len=i;
be06a934	340	return 1;
d02b48c6 RE	341	}
d02b48c6 RE	342
be06a934	343	int EVP_EncryptFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
581f1c84 DSH	344	{
	345	int ret;
	346	ret = EVP_EncryptFinal_ex(ctx, out, outl);
581f1c84 DSH	347	return ret;
	348	}
	349
	350	int EVP_EncryptFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
d02b48c6	351	{
27545970 GT	352	int n,ret;
27545970 GT	353	unsigned int i, b, bl;
d02b48c6 RE	354
d02b48c6 RE	355	b=ctx->cipher->block_size;
54a656ef	356	OPENSSL_assert(b <= sizeof ctx->buf);
d02b48c6 RE	357	if (b == 1)
	358	{
	359	*outl=0;
be06a934	360	return 1;
d02b48c6 RE	361	}
d02b48c6 RE	362	bl=ctx->buf_len;
f2e5ca84 DSH	363	if (ctx->flags & EVP_CIPH_NO_PADDING)
	364	{
	365	if(bl)
	366	{
8afca8d9	367	EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
f2e5ca84 DSH	368	return 0;
	369	}
	370	*outl = 0;
	371	return 1;
	372	}
f0446ca8	373
d02b48c6 RE	374	n=b-bl;
	375	for (i=bl; i<b; i++)
	376	ctx->buf[i]=n;
f0446ca8 BL	377	ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
f0446ca8 BL	378
f0446ca8 BL	379
	380	if(ret)
	381	*outl=b;
	382
	383	return ret;
d02b48c6 RE	384	}
d02b48c6 RE	385
be06a934	386	int EVP_DecryptUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
5e4430e7	387	const unsigned char *in, size_t inl)
d02b48c6	388	{
27545970 GT	389	int fix_len;
27545970 GT	390	unsigned int b;
d02b48c6	391
2e415778	392	if (inl <= 0)
c148d709	393	{
2e415778 BM	394	*outl = 0;
2e415778 BM	395	return inl == 0;
c148d709	396	}
d02b48c6	397
f2e5ca84 DSH	398	if (ctx->flags & EVP_CIPH_NO_PADDING)
	399	return EVP_EncryptUpdate(ctx, out, outl, in, inl);
	400
d02b48c6	401	b=ctx->cipher->block_size;
54a656ef	402	OPENSSL_assert(b <= sizeof ctx->final);
f329b8d7	403
c148d709	404	if(ctx->final_used)
d02b48c6	405	{
c148d709 BL	406	memcpy(out,ctx->final,b);
c148d709 BL	407	out+=b;
f329b8d7	408	fix_len = 1;
d02b48c6	409	}
f329b8d7 DSH	410	else
	411	fix_len = 0;
	412
	413
c148d709 BL	414	if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
c148d709 BL	415	return 0;
d02b48c6 RE	416
	417	/* if we have 'decrypted' a multiple of block size, make sure
	418	* we have a copy of this last block */
c148d709	419	if (b > 1 && !ctx->buf_len)
d02b48c6	420	{
f329b8d7 DSH	421	*outl-=b;
f329b8d7 DSH	422	ctx->final_used=1;
c148d709 BL	423	memcpy(ctx->final,&out[*outl],b);
c148d709 BL	424	}
f329b8d7 DSH	425	else
	426	ctx->final_used = 0;
	427
	428	if (fix_len)
	429	*outl += b;
	430
be06a934	431	return 1;
d02b48c6 RE	432	}
d02b48c6 RE	433
6b691a5c	434	int EVP_DecryptFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
581f1c84 DSH	435	{
	436	int ret;
	437	ret = EVP_DecryptFinal_ex(ctx, out, outl);
581f1c84 DSH	438	return ret;
	439	}
	440
	441	int EVP_DecryptFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
d02b48c6	442	{
27545970 GT	443	int i,n;
27545970 GT	444	unsigned int b;
d02b48c6 RE	445
	446	*outl=0;
	447	b=ctx->cipher->block_size;
f2e5ca84 DSH	448	if (ctx->flags & EVP_CIPH_NO_PADDING)
	449	{
	450	if(ctx->buf_len)
	451	{
8afca8d9	452	EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
f2e5ca84 DSH	453	return 0;
	454	}
	455	*outl = 0;
	456	return 1;
	457	}
d02b48c6 RE	458	if (b > 1)
d02b48c6 RE	459	{
c148d709	460	if (ctx->buf_len \|\| !ctx->final_used)
d02b48c6	461	{
8afca8d9	462	EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
d02b48c6 RE	463	return(0);
d02b48c6 RE	464	}
54a656ef	465	OPENSSL_assert(b <= sizeof ctx->final);
c148d709	466	n=ctx->final[b-1];
b554eef4	467	if (n == 0 \|\| n > (int)b)
d02b48c6	468	{
8afca8d9	469	EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
d02b48c6 RE	470	return(0);
	471	}
	472	for (i=0; i<n; i++)
	473	{
c148d709	474	if (ctx->final[--b] != n)
d02b48c6	475	{
8afca8d9	476	EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT);
d02b48c6 RE	477	return(0);
	478	}
	479	}
	480	n=ctx->cipher->block_size-n;
	481	for (i=0; i<n; i++)
c148d709	482	out[i]=ctx->final[i];
d02b48c6 RE	483	*outl=n;
	484	}
	485	else
	486	*outl=0;
	487	return(1);
	488	}
	489
b40228a6 DSH	490	void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
	491	{
	492	if (ctx)
	493	{
	494	EVP_CIPHER_CTX_cleanup(ctx);
	495	OPENSSL_free(ctx);
	496	}
	497	}
	498
be06a934	499	int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
d02b48c6	500	{
544a2aea	501	if (c->cipher != NULL)
be06a934	502	{
544a2aea DSH	503	if(c->cipher->cleanup && !c->cipher->cleanup(c))
544a2aea DSH	504	return 0;
43d60164	505	/* Cleanse cipher context data */
544a2aea	506	if (c->cipher_data)
43d60164	507	OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
be06a934	508	}
544a2aea DSH	509	if (c->cipher_data)
544a2aea DSH	510	OPENSSL_free(c->cipher_data);
0b13e9f0	511	#ifndef OPENSSL_NO_ENGINE
11a57c7b GT	512	if (c->engine)
	513	/* The EVP_CIPHER we used belongs to an ENGINE, release the
	514	* functional reference we held for this reason. */
	515	ENGINE_finish(c->engine);
0b13e9f0	516	#endif
d02b48c6	517	memset(c,0,sizeof(EVP_CIPHER_CTX));
be06a934	518	return 1;
d02b48c6 RE	519	}
d02b48c6 RE	520
5e4430e7	521	int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, size_t keylen)
7f060601	522	{
49528751	523	if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
5e4430e7	524	return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, (int)keylen, NULL);
7f060601 DSH	525	if(c->key_len == keylen) return 1;
	526	if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
	527	{
	528	c->key_len = keylen;
	529	return 1;
	530	}
	531	EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
	532	return 0;
	533	}
49528751	534
f2e5ca84 DSH	535	int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
	536	{
	537	if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
	538	else ctx->flags \|= EVP_CIPH_NO_PADDING;
	539	return 1;
	540	}
	541
49528751 DSH	542	int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX ctx, int type, int arg, void ptr)
	543	{
	544	int ret;
	545	if(!ctx->cipher) {
	546	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
	547	return 0;
	548	}
	549
	550	if(!ctx->cipher->ctrl) {
	551	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
	552	return 0;
	553	}
	554
	555	ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
	556	if(ret == -1) {
	557	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
	558	return 0;
	559	}
	560	return ret;
	561	}
216659eb DSH	562
	563	int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX ctx, unsigned char key)
	564	{
	565	if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
	566	return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
	567	if (RAND_bytes(key, ctx->key_len) <= 0)
	568	return 0;
	569	return 1;
	570	}
	571