[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 "evp.h"

const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;

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

void EVP_CipherInit(ctx,data,key,iv,enc)
EVP_CIPHER_CTX *ctx;
const EVP_CIPHER *data;
unsigned char *key;
unsigned char *iv;
int enc;
	{
	if (enc)
		EVP_EncryptInit(ctx,data,key,iv);
	else	
		EVP_DecryptInit(ctx,data,key,iv);
	}

void EVP_CipherUpdate(ctx,out,outl,in,inl)
EVP_CIPHER_CTX *ctx;
unsigned char *out;
int *outl;
unsigned char *in;
int inl;
	{
	if (ctx->encrypt)
		EVP_EncryptUpdate(ctx,out,outl,in,inl);
	else	EVP_DecryptUpdate(ctx,out,outl,in,inl);
	}

int EVP_CipherFinal(ctx,out,outl)
EVP_CIPHER_CTX *ctx;
unsigned char *out;
int *outl;
	{
	if (ctx->encrypt)
		{
		EVP_EncryptFinal(ctx,out,outl);
		return(1);
		}
	else	return(EVP_DecryptFinal(ctx,out,outl));
	}

void EVP_EncryptInit(ctx,cipher,key,iv)
EVP_CIPHER_CTX *ctx;
const EVP_CIPHER *cipher;
unsigned char *key;
unsigned char *iv;
	{
	if (cipher != NULL)
		ctx->cipher=cipher;
	ctx->cipher->init(ctx,key,iv,1);
	ctx->encrypt=1;
	ctx->buf_len=0;
	}

void EVP_DecryptInit(ctx,cipher,key,iv)
EVP_CIPHER_CTX *ctx;
const EVP_CIPHER *cipher;
unsigned char *key;
unsigned char *iv;
	{
	if (cipher != NULL)
		ctx->cipher=cipher;
	ctx->cipher->init(ctx,key,iv,0);
	ctx->encrypt=0;
	ctx->buf_len=0;
	}


void EVP_EncryptUpdate(ctx,out,outl,in,inl)
EVP_CIPHER_CTX *ctx;
unsigned char *out;
int *outl;
unsigned char *in;
int inl;
	{
	int i,j,bl;

	i=ctx->buf_len;
	bl=ctx->cipher->block_size;
	*outl=0;
	if ((inl == 0) && (i != bl)) return;
	if (i != 0)
		{
		if (i+inl < bl)
			{
			memcpy(&(ctx->buf[i]),in,inl);
			ctx->buf_len+=inl;
			return;
			}
		else
			{
			j=bl-i;
			if (j != 0) memcpy(&(ctx->buf[i]),in,j);
			ctx->cipher->do_cipher(ctx,out,ctx->buf,bl);
			inl-=j;
			in+=j;
			out+=bl;
			*outl+=bl;
			}
		}
	i=inl%bl; /* how much is left */
	inl-=i;
	if (inl > 0)
		{
		ctx->cipher->do_cipher(ctx,out,in,inl);
		*outl+=inl;
		}

	if (i != 0)
		memcpy(ctx->buf,&(in[inl]),i);
	ctx->buf_len=i;
	}

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

	b=ctx->cipher->block_size;
	if (b == 1)
		{
		*outl=0;
		return;
		}
	bl=ctx->buf_len;
	n=b-bl;
	for (i=bl; i<b; i++)
		ctx->buf[i]=n;
	ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
	*outl=b;
	}

void EVP_DecryptUpdate(ctx,out,outl,in,inl)
EVP_CIPHER_CTX *ctx;
unsigned char *out;
int *outl;
unsigned char *in;
int inl;
	{
	int b,bl,n;
	int keep_last=0;

	*outl=0;
	if (inl == 0) return;

	b=ctx->cipher->block_size;
	if (b > 1)
		{
		/* Is the input a multiple of the block size? */
		bl=ctx->buf_len;
		n=inl+bl;
		if (n%b == 0)
			{
			if (inl < b) /* must be 'just one' buff */
				{
				memcpy(&(ctx->buf[bl]),in,inl);
				ctx->buf_len=b;
				*outl=0;
				return;
				}
			keep_last=1;
			inl-=b; /* don't do the last block */
			}
		}
	EVP_EncryptUpdate(ctx,out,outl,in,inl);

	/* if we have 'decrypted' a multiple of block size, make sure
	 * we have a copy of this last block */
	if (keep_last)
		{
		memcpy(&(ctx->buf[0]),&(in[inl]),b);
#ifdef DEBUG
		if (ctx->buf_len != 0)
			{
			abort();
			}
#endif
		ctx->buf_len=b;
		}
	}

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

	*outl=0;
	b=ctx->cipher->block_size;
	if (b > 1)
		{
		if (ctx->buf_len != b)
			{
			EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
			return(0);
			}
		EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0);
		if (n != b)
			return(0);
		n=ctx->buf[b-1];
		if (n > b)
			{
			EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
			return(0);
			}
		for (i=0; i<n; i++)
			{
			if (ctx->buf[--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->buf[i];
		*outl=n;
		}
	else
		*outl=0;
	return(1);
	}

void EVP_CIPHER_CTX_cleanup(c)
EVP_CIPHER_CTX *c;
	{
	if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
		c->cipher->cleanup(c);
	memset(c,0,sizeof(EVP_CIPHER_CTX));
	}
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"
	61	#include "evp.h"
	62
e778802f	63	const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
58964a49 RE	64
	65	void EVP_CIPHER_CTX_init(ctx)
	66	EVP_CIPHER_CTX *ctx;
	67	{
	68	memset(ctx,0,sizeof(EVP_CIPHER_CTX));
	69	/* ctx->cipher=NULL; */
	70	}
d02b48c6 RE	71
	72	void EVP_CipherInit(ctx,data,key,iv,enc)
	73	EVP_CIPHER_CTX *ctx;
e778802f	74	const EVP_CIPHER *data;
d02b48c6 RE	75	unsigned char *key;
	76	unsigned char *iv;
	77	int enc;
	78	{
	79	if (enc)
	80	EVP_EncryptInit(ctx,data,key,iv);
	81	else
	82	EVP_DecryptInit(ctx,data,key,iv);
	83	}
	84
	85	void EVP_CipherUpdate(ctx,out,outl,in,inl)
	86	EVP_CIPHER_CTX *ctx;
	87	unsigned char *out;
	88	int *outl;
	89	unsigned char *in;
	90	int inl;
	91	{
	92	if (ctx->encrypt)
	93	EVP_EncryptUpdate(ctx,out,outl,in,inl);
	94	else EVP_DecryptUpdate(ctx,out,outl,in,inl);
	95	}
	96
	97	int EVP_CipherFinal(ctx,out,outl)
	98	EVP_CIPHER_CTX *ctx;
	99	unsigned char *out;
	100	int *outl;
	101	{
	102	if (ctx->encrypt)
	103	{
	104	EVP_EncryptFinal(ctx,out,outl);
	105	return(1);
	106	}
	107	else return(EVP_DecryptFinal(ctx,out,outl));
	108	}
	109
	110	void EVP_EncryptInit(ctx,cipher,key,iv)
	111	EVP_CIPHER_CTX *ctx;
e778802f	112	const EVP_CIPHER *cipher;
d02b48c6 RE	113	unsigned char *key;
	114	unsigned char *iv;
	115	{
	116	if (cipher != NULL)
	117	ctx->cipher=cipher;
	118	ctx->cipher->init(ctx,key,iv,1);
	119	ctx->encrypt=1;
	120	ctx->buf_len=0;
	121	}
	122
	123	void EVP_DecryptInit(ctx,cipher,key,iv)
	124	EVP_CIPHER_CTX *ctx;
e778802f	125	const EVP_CIPHER *cipher;
d02b48c6 RE	126	unsigned char *key;
	127	unsigned char *iv;
	128	{
	129	if (cipher != NULL)
	130	ctx->cipher=cipher;
	131	ctx->cipher->init(ctx,key,iv,0);
	132	ctx->encrypt=0;
	133	ctx->buf_len=0;
	134	}
	135
	136
	137	void EVP_EncryptUpdate(ctx,out,outl,in,inl)
	138	EVP_CIPHER_CTX *ctx;
	139	unsigned char *out;
	140	int *outl;
	141	unsigned char *in;
	142	int inl;
	143	{
	144	int i,j,bl;
	145
	146	i=ctx->buf_len;
	147	bl=ctx->cipher->block_size;
	148	*outl=0;
	149	if ((inl == 0) && (i != bl)) return;
	150	if (i != 0)
	151	{
	152	if (i+inl < bl)
	153	{
	154	memcpy(&(ctx->buf[i]),in,inl);
	155	ctx->buf_len+=inl;
	156	return;
	157	}
	158	else
	159	{
	160	j=bl-i;
	161	if (j != 0) memcpy(&(ctx->buf[i]),in,j);
	162	ctx->cipher->do_cipher(ctx,out,ctx->buf,bl);
	163	inl-=j;
	164	in+=j;
	165	out+=bl;
	166	*outl+=bl;
	167	}
	168	}
	169	i=inl%bl; /* how much is left */
	170	inl-=i;
	171	if (inl > 0)
	172	{
	173	ctx->cipher->do_cipher(ctx,out,in,inl);
	174	*outl+=inl;
	175	}
	176
	177	if (i != 0)
	178	memcpy(ctx->buf,&(in[inl]),i);
	179	ctx->buf_len=i;
	180	}
	181
	182	void EVP_EncryptFinal(ctx,out,outl)
	183	EVP_CIPHER_CTX *ctx;
	184	unsigned char *out;
	185	int *outl;
	186	{
	187	int i,n,b,bl;
	188
	189	b=ctx->cipher->block_size;
190	if (b == 1)
191	{
192	*outl=0;
193	return;
194	}
195	bl=ctx->buf_len;
196	n=b-bl;
197	for (i=bl; i<b; i++)
198	ctx->buf[i]=n;
199	ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
200	*outl=b;
201	}
202
203	void EVP_DecryptUpdate(ctx,out,outl,in,inl)
204	EVP_CIPHER_CTX *ctx;
205	unsigned char *out;
206	int *outl;
207	unsigned char *in;
208	int inl;
209	{
210	int b,bl,n;
211	int keep_last=0;
212
213	*outl=0;
214	if (inl == 0) return;
215
216	b=ctx->cipher->block_size;
217	if (b > 1)
218	{
219	/* Is the input a multiple of the block size? */
220	bl=ctx->buf_len;
221	n=inl+bl;
222	if (n%b == 0)
223	{
224	if (inl < b) /* must be 'just one' buff */
225	{
226	memcpy(&(ctx->buf[bl]),in,inl);
227	ctx->buf_len=b;
228	*outl=0;
229	return;
230	}
231	keep_last=1;
232	inl-=b; /* don't do the last block */
233	}
234	}
235	EVP_EncryptUpdate(ctx,out,outl,in,inl);
236
237	/* if we have 'decrypted' a multiple of block size, make sure
238	* we have a copy of this last block */
239	if (keep_last)
240	{
241	memcpy(&(ctx->buf[0]),&(in[inl]),b);
242	#ifdef DEBUG
243	if (ctx->buf_len != 0)
244	{
245	abort();
246	}
247	#endif
248	ctx->buf_len=b;
249	}
250	}
251
252	int EVP_DecryptFinal(ctx,out,outl)
253	EVP_CIPHER_CTX *ctx;
254	unsigned char *out;
255	int *outl;
256	{
257	int i,b;
258	int n;
259
260	*outl=0;
261	b=ctx->cipher->block_size;
262	if (b > 1)
263	{
264	if (ctx->buf_len != b)
265	{
266	EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
267	return(0);
268	}
269	EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0);
270	if (n != b)
271	return(0);
272	n=ctx->buf[b-1];
273	if (n > b)
274	{
275	EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
276	return(0);
277	}
278	for (i=0; i<n; i++)
279	{
280	if (ctx->buf[--b] != n)
281	{
282	EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
283	return(0);
284	}
285	}
286	n=ctx->cipher->block_size-n;
287	for (i=0; i<n; i++)
288	out[i]=ctx->buf[i];
289	*outl=n;
290	}
291	else
292	*outl=0;
293	return(1);
294	}
295
296	void EVP_CIPHER_CTX_cleanup(c)
297	EVP_CIPHER_CTX *c;
298	{
299	if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
300	c->cipher->cleanup(c);
301	memset(c,0,sizeof(EVP_CIPHER_CTX));
302	}
303