Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/crypto/../../libssl/src/crypto/evp/evp_enc.c	Lines:	161	304	53.0 %
Date:	2016-12-06	Branches:	91	199	45.7 %


/* $OpenBSD: evp_enc.c,v 1.31 2016/05/30 13:42:54 beck Exp $ */
/* 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 <stdlib.h>
#include <string.h>

#include <openssl/opensslconf.h>

#include <openssl/err.h>
#include <openssl/evp.h>

#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif

#include "evp_locl.h"

#define M_do_cipher(ctx, out, in, inl) ctx->cipher->do_cipher(ctx, out, in, inl)

void
EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
{
	memset(ctx, 0, sizeof(EVP_CIPHER_CTX));
}

EVP_CIPHER_CTX *
EVP_CIPHER_CTX_new(void)
{
	return calloc(1, sizeof(EVP_CIPHER_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). */
		if (ctx->cipher) {
			unsigned long flags = ctx->flags;
			EVP_CIPHER_CTX_cleanup(ctx);
			/* Restore encrypt and flags */
			ctx->encrypt = enc;
			ctx->flags = flags;
		}
#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) {
				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 = 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 */
	if (ctx->cipher->block_size != 1 &&
	    ctx->cipher->block_size != 8 &&
	    ctx->cipher->block_size != 16) {
		EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_BAD_BLOCK_LENGTH);
		return 0;
	}

	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;
			/* fall-through */

		case EVP_CIPH_CBC_MODE:

			if ((size_t)EVP_CIPHER_CTX_iv_length(ctx) >
			    sizeof(ctx->iv)) {
				EVPerr(EVP_F_EVP_CIPHERINIT_EX,
				    EVP_R_IV_TOO_LARGE);
				return 0;
			}
			if (iv)
				memcpy(ctx->oiv, iv,
				    EVP_CIPHER_CTX_iv_length(ctx));
			memcpy(ctx->iv, ctx->oiv,
			    EVP_CIPHER_CTX_iv_length(ctx));
			break;

		case EVP_CIPH_CTR_MODE:
			ctx->num = 0;
			/* Don't reuse IV for CTR mode */
			if (iv)
				memcpy(ctx->iv, iv,
				    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_ex(ctx, out, outl);
	else
		return EVP_DecryptFinal_ex(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;

	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
		i = M_do_cipher(ctx, out, in, inl);
		if (i < 0)
			return 0;
		else
			*outl = i;
		return 1;
	}

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

	if (ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0) {
		if (M_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 ((size_t)bl > sizeof(ctx->buf)) {
		EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_BAD_BLOCK_LENGTH);
		*outl = 0;
		return 0;
	}
	if (i != 0) {
		if (bl - i > inl) {
			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 (!M_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 (!M_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);
	(void) EVP_CIPHER_CTX_cleanup(ctx);
	return ret;
}

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

	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
		ret = M_do_cipher(ctx, out, NULL, 0);
		if (ret < 0)
			return 0;
		else
			*outl = ret;
		return 1;
	}

	b = ctx->cipher->block_size;
	if (b > sizeof ctx->buf) {
		EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_BAD_BLOCK_LENGTH);
		return 0;
	}
	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 = M_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 fix_len;
	unsigned int b;

	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
		fix_len = M_do_cipher(ctx, out, in, inl);
		if (fix_len < 0) {
			*outl = 0;
			return 0;
		} else
			*outl = fix_len;
		return 1;
	}

	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;
	if (b > sizeof ctx->final) {
		EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_BAD_BLOCK_LENGTH);
		return 0;
	}

	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);
	(void) EVP_CIPHER_CTX_cleanup(ctx);
	return ret;
}

int
EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
	int i, n;
	unsigned int b;
	*outl = 0;

	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
		i = M_do_cipher(ctx, out, NULL, 0);
		if (i < 0)
			return 0;
		else
			*outl = i;
		return 1;
	}

	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);
		}
		if (b > sizeof ctx->final) {
			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
			    EVP_R_BAD_BLOCK_LENGTH);
			return 0;
		}
		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);
		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)
			explicit_bzero(c->cipher_data, c->cipher->ctx_size);
	}
	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
	explicit_bzero(c, 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;
}

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);
	arc4random_buf(key, ctx->key_len);
	return 1;
}

int
EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
{
	if ((in == NULL) || (in->cipher == NULL)) {
		EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
		return 0;
	}
#ifndef OPENSSL_NO_ENGINE
	/* Make sure it's safe to copy a cipher context using an ENGINE */
	if (in->engine && !ENGINE_init(in->engine)) {
		EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
		return 0;
	}
#endif

	EVP_CIPHER_CTX_cleanup(out);
	memcpy(out, in, sizeof *out);

	if (in->cipher_data && in->cipher->ctx_size) {
		out->cipher_data = malloc(in->cipher->ctx_size);
		if (!out->cipher_data) {
			EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
			return 0;
		}
		memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
	}

	if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
		return in->cipher->ctrl((EVP_CIPHER_CTX *)in,
		    EVP_CTRL_COPY, 0, out);
	return 1;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: evp_enc.c,v 1.31 2016/05/30 13:42:54 beck Exp $ */
2			/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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 <stdlib.h>
61			#include <string.h>
62
63			#include <openssl/opensslconf.h>
64
65			#include <openssl/err.h>
66			#include <openssl/evp.h>
67
68			#ifndef OPENSSL_NO_ENGINE
69			#include <openssl/engine.h>
70			#endif
71
72			#include "evp_locl.h"
73
74			#define M_do_cipher(ctx, out, in, inl) ctx->cipher->do_cipher(ctx, out, in, inl)
75
76			void
77			EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
78		199	{
79		199	memset(ctx, 0, sizeof(EVP_CIPHER_CTX));
80		199	}
81
82			EVP_CIPHER_CTX *
83			EVP_CIPHER_CTX_new(void)
84			{
85			return calloc(1, sizeof(EVP_CIPHER_CTX));
86			}
87
88			int
89			EVP_CipherInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
90			const unsigned char key, const unsigned char iv, int enc)
91			{
92			if (cipher)
93			EVP_CIPHER_CTX_init(ctx);
94			return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
95			}
96
97			int
98			EVP_CipherInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher, ENGINE *impl,
99			const unsigned char key, const unsigned char iv, int enc)
100		267	{
101	✗✓	267	if (enc == -1)
102			enc = ctx->encrypt;
103			else {
104	✓✓	267	if (enc)
105		151	enc = 1;
106		267	ctx->encrypt = enc;
107			}
108			#ifndef OPENSSL_NO_ENGINE
109			/* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
110			* so this context may already have an ENGINE! Try to avoid releasing
111			* the previous handle, re-querying for an ENGINE, and having a
112			* reinitialisation, when it may all be unecessary. */
113	✗✓✗✗ ✗✗✗✗ ✗✗	267	if (ctx->engine && ctx->cipher &&
114			(!cipher \|\| (cipher && (cipher->nid == ctx->cipher->nid))))
115			goto skip_to_init;
116			#endif
117	✓✓	267	if (cipher) {
118			/* Ensure a context left lying around from last time is cleared
119			* (the previous check attempted to avoid this if the same
120			* ENGINE and EVP_CIPHER could be used). */
121	✓✓	265	if (ctx->cipher) {
122		66	unsigned long flags = ctx->flags;
123		66	EVP_CIPHER_CTX_cleanup(ctx);
124			/* Restore encrypt and flags */
125		66	ctx->encrypt = enc;
126		66	ctx->flags = flags;
127			}
128			#ifndef OPENSSL_NO_ENGINE
129	✗✓	265	if (impl) {
130			if (!ENGINE_init(impl)) {
131			EVPerr(EVP_F_EVP_CIPHERINIT_EX,
132			EVP_R_INITIALIZATION_ERROR);
133			return 0;
134			}
135			} else
136			/* Ask if an ENGINE is reserved for this job */
137		265	impl = ENGINE_get_cipher_engine(cipher->nid);
138	✗✓	265	if (impl) {
139			/* There's an ENGINE for this job ... (apparently) */
140			const EVP_CIPHER *c =
141			ENGINE_get_cipher(impl, cipher->nid);
142			if (!c) {
143			EVPerr(EVP_F_EVP_CIPHERINIT_EX,
144			EVP_R_INITIALIZATION_ERROR);
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			} else
154		265	ctx->engine = NULL;
155			#endif
156
157		265	ctx->cipher = cipher;
158	✓✗	265	if (ctx->cipher->ctx_size) {
159		265	ctx->cipher_data = malloc(ctx->cipher->ctx_size);
160	✗✓	265	if (!ctx->cipher_data) {
161			EVPerr(EVP_F_EVP_CIPHERINIT_EX,
162			ERR_R_MALLOC_FAILURE);
163			return 0;
164			}
165			} else {
166			ctx->cipher_data = NULL;
167			}
168		265	ctx->key_len = cipher->key_len;
169		265	ctx->flags = 0;
170	✓✓	265	if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
171	✗✓	12	if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
172			EVPerr(EVP_F_EVP_CIPHERINIT_EX,
173			EVP_R_INITIALIZATION_ERROR);
174			return 0;
175			}
176			}
177	✗✓	2	} else if (!ctx->cipher) {
178			EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
179			return 0;
180			}
181			#ifndef OPENSSL_NO_ENGINE
182		267	skip_to_init:
183			#endif
184			/* we assume block size is a power of 2 in cryptUpdate /
185	✓✓✗✓	267	if (ctx->cipher->block_size != 1 &&
186			ctx->cipher->block_size != 8 &&
187			ctx->cipher->block_size != 16) {
188			EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_BAD_BLOCK_LENGTH);
189			return 0;
190			}
191
192	✓✗	267	if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
193	✓✓✓✗ ✓	267	switch (EVP_CIPHER_CTX_mode(ctx)) {
194
195			case EVP_CIPH_STREAM_CIPHER:
196			case EVP_CIPH_ECB_MODE:
197			break;
198
199			case EVP_CIPH_CFB_MODE:
200			case EVP_CIPH_OFB_MODE:
201
202		104	ctx->num = 0;
203			/* fall-through */
204
205			case EVP_CIPH_CBC_MODE:
206
207	✗✓	160	if ((size_t)EVP_CIPHER_CTX_iv_length(ctx) >
208			sizeof(ctx->iv)) {
209			EVPerr(EVP_F_EVP_CIPHERINIT_EX,
210			EVP_R_IV_TOO_LARGE);
211			return 0;
212			}
213	✓✓	160	if (iv)
214		157	memcpy(ctx->oiv, iv,
215			EVP_CIPHER_CTX_iv_length(ctx));
216		160	memcpy(ctx->iv, ctx->oiv,
217			EVP_CIPHER_CTX_iv_length(ctx));
218		160	break;
219
220			case EVP_CIPH_CTR_MODE:
221		9	ctx->num = 0;
222			/* Don't reuse IV for CTR mode */
223	✓✗	9	if (iv)
224		9	memcpy(ctx->iv, iv,
225			EVP_CIPHER_CTX_iv_length(ctx));
226			break;
227
228			default:
229			return 0;
230			break;
231			}
232			}
233
234	✓✓✗✓	267	if (key \|\| (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
235	✗✓	265	if (!ctx->cipher->init(ctx, key, iv, enc))
236			return 0;
237			}
238		267	ctx->buf_len = 0;
239		267	ctx->final_used = 0;
240		267	ctx->block_mask = ctx->cipher->block_size - 1;
241		267	return 1;
242			}
243
244			int
245			EVP_CipherUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
246			const unsigned char *in, int inl)
247		2	{
248	✓✓	2	if (ctx->encrypt)
249		1	return EVP_EncryptUpdate(ctx, out, outl, in, inl);
250			else
251		1	return EVP_DecryptUpdate(ctx, out, outl, in, inl);
252			}
253
254			int
255			EVP_CipherFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
256		2	{
257	✓✓	2	if (ctx->encrypt)
258		1	return EVP_EncryptFinal_ex(ctx, out, outl);
259			else
260		1	return EVP_DecryptFinal_ex(ctx, out, outl);
261			}
262
263			int
264			EVP_CipherFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
265			{
266			if (ctx->encrypt)
267			return EVP_EncryptFinal_ex(ctx, out, outl);
268			else
269			return EVP_DecryptFinal_ex(ctx, out, outl);
270			}
271
272			int
273			EVP_EncryptInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
274			const unsigned char key, const unsigned char iv)
275			{
276			return EVP_CipherInit(ctx, cipher, key, iv, 1);
277			}
278
279			int
280			EVP_EncryptInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher, ENGINE *impl,
281			const unsigned char key, const unsigned char iv)
282		149	{
283		149	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
284			}
285
286			int
287			EVP_DecryptInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
288			const unsigned char key, const unsigned char iv)
289			{
290			return EVP_CipherInit(ctx, cipher, key, iv, 0);
291			}
292
293			int
294			EVP_DecryptInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher, ENGINE *impl,
295			const unsigned char key, const unsigned char iv)
296		114	{
297		114	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
298			}
299
300			int
301			EVP_EncryptUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
302			const unsigned char *in, int inl)
303		265	{
304			int i, j, bl;
305
306	✗✓	265	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
307			i = M_do_cipher(ctx, out, in, inl);
308			if (i < 0)
309			return 0;
310			else
311			*outl = i;
312			return 1;
313			}
314
315	✗✓	265	if (inl <= 0) {
316			*outl = 0;
317			return inl == 0;
318			}
319
320	✓✗✓✓	265	if (ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0) {
321	✓✗	264	if (M_do_cipher(ctx, out, in, inl)) {
322		264	*outl = inl;
323		264	return 1;
324			} else {
325			*outl = 0;
326			return 0;
327			}
328			}
329		1	i = ctx->buf_len;
330		1	bl = ctx->cipher->block_size;
331	✗✓	1	if ((size_t)bl > sizeof(ctx->buf)) {
332			EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_BAD_BLOCK_LENGTH);
333			*outl = 0;
334			return 0;
335			}
336	✗✓	1	if (i != 0) {
337			if (bl - i > inl) {
338			memcpy(&(ctx->buf[i]), in, inl);
339			ctx->buf_len += inl;
340			*outl = 0;
341			return 1;
342			} else {
343			j = bl - i;
344			memcpy(&(ctx->buf[i]), in, j);
345			if (!M_do_cipher(ctx, out, ctx->buf, bl))
346			return 0;
347			inl -= j;
348			in += j;
349			out += bl;
350			*outl = bl;
351			}
352			} else
353		1	*outl = 0;
354		1	i = inl&(bl - 1);
355		1	inl -= i;
356	✓✗	1	if (inl > 0) {
357	✗✓	1	if (!M_do_cipher(ctx, out, in, inl))
358			return 0;
359		1	*outl += inl;
360			}
361
362	✓✗	1	if (i != 0)
363		1	memcpy(ctx->buf, &(in[inl]), i);
364		1	ctx->buf_len = i;
365		1	return 1;
366			}
367
368			int
369			EVP_EncryptFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
370			{
371			int ret;
372
373			ret = EVP_EncryptFinal_ex(ctx, out, outl);
374			(void) EVP_CIPHER_CTX_cleanup(ctx);
375			return ret;
376			}
377
378			int
379			EVP_EncryptFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
380		146	{
381			int n, ret;
382			unsigned int i, b, bl;
383
384	✗✓	146	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
385			ret = M_do_cipher(ctx, out, NULL, 0);
386			if (ret < 0)
387			return 0;
388			else
389			*outl = ret;
390			return 1;
391			}
392
393		146	b = ctx->cipher->block_size;
394	✗✓	146	if (b > sizeof ctx->buf) {
395			EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_BAD_BLOCK_LENGTH);
396			return 0;
397			}
398	✓✓	146	if (b == 1) {
399		79	*outl = 0;
400		79	return 1;
401			}
402		67	bl = ctx->buf_len;
403	✓✓	67	if (ctx->flags & EVP_CIPH_NO_PADDING) {
404	✗✓	66	if (bl) {
405			EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
406			EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
407			return 0;
408			}
409		66	*outl = 0;
410		66	return 1;
411			}
412
413		1	n = b - bl;
414	✓✓	11	for (i = bl; i < b; i++)
415		10	ctx->buf[i] = n;
416		1	ret = M_do_cipher(ctx, out, ctx->buf, b);
417
418
419	✓✗	1	if (ret)
420		1	*outl = b;
421
422		1	return ret;
423			}
424
425			int
426			EVP_DecryptUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
427			const unsigned char *in, int inl)
428		115	{
429			int fix_len;
430			unsigned int b;
431
432	✗✓	115	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
433			fix_len = M_do_cipher(ctx, out, in, inl);
434			if (fix_len < 0) {
435			*outl = 0;
436			return 0;
437			} else
438			*outl = fix_len;
439			return 1;
440			}
441
442	✗✓	115	if (inl <= 0) {
443			*outl = 0;
444			return inl == 0;
445			}
446
447	✓✓	115	if (ctx->flags & EVP_CIPH_NO_PADDING)
448		114	return EVP_EncryptUpdate(ctx, out, outl, in, inl);
449
450		1	b = ctx->cipher->block_size;
451	✗✓	1	if (b > sizeof ctx->final) {
452			EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_BAD_BLOCK_LENGTH);
453			return 0;
454			}
455
456	✗✓	1	if (ctx->final_used) {
457			memcpy(out, ctx->final, b);
458			out += b;
459			fix_len = 1;
460			} else
461		1	fix_len = 0;
462
463
464	✗✓	1	if (!EVP_EncryptUpdate(ctx, out, outl, in, inl))
465			return 0;
466
467			/* if we have 'decrypted' a multiple of block size, make sure
468			* we have a copy of this last block */
469	✓✗✓✗	2	if (b > 1 && !ctx->buf_len) {
470		1	*outl -= b;
471		1	ctx->final_used = 1;
472		1	memcpy(ctx->final, &out[*outl], b);
473			} else
474			ctx->final_used = 0;
475
476	✗✓	1	if (fix_len)
477			*outl += b;
478
479		1	return 1;
480			}
481
482			int
483			EVP_DecryptFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
484			{
485			int ret;
486
487			ret = EVP_DecryptFinal_ex(ctx, out, outl);
488			(void) EVP_CIPHER_CTX_cleanup(ctx);
489			return ret;
490			}
491
492			int
493			EVP_DecryptFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
494		115	{
495			int i, n;
496			unsigned int b;
497		115	*outl = 0;
498
499	✗✓	115	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
500			i = M_do_cipher(ctx, out, NULL, 0);
501			if (i < 0)
502			return 0;
503			else
504			*outl = i;
505			return 1;
506			}
507
508		115	b = ctx->cipher->block_size;
509	✓✓	115	if (ctx->flags & EVP_CIPH_NO_PADDING) {
510	✗✓	114	if (ctx->buf_len) {
511			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
512			EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
513			return 0;
514			}
515		114	*outl = 0;
516		114	return 1;
517			}
518	✓✗	1	if (b > 1) {
519	✓✗✗✓	1	if (ctx->buf_len \|\| !ctx->final_used) {
520			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
521			EVP_R_WRONG_FINAL_BLOCK_LENGTH);
522			return (0);
523			}
524	✗✓	1	if (b > sizeof ctx->final) {
525			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
526			EVP_R_BAD_BLOCK_LENGTH);
527			return 0;
528			}
529		1	n = ctx->final[b - 1];
530	✗✓	1	if (n == 0 \|\| n > (int)b) {
531			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
532			return (0);
533			}
534	✓✓	11	for (i = 0; i < n; i++) {
535	✗✓	10	if (ctx->final[--b] != n) {
536			EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
537			EVP_R_BAD_DECRYPT);
538			return (0);
539			}
540			}
541		1	n = ctx->cipher->block_size - n;
542	✓✓	7	for (i = 0; i < n; i++)
543		6	out[i] = ctx->final[i];
544		1	*outl = n;
545			} else
546			*outl = 0;
547		1	return (1);
548			}
549
550			void
551			EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
552		12	{
553	✗✓	12	if (ctx) {
554			EVP_CIPHER_CTX_cleanup(ctx);
555			free(ctx);
556			}
557		12	}
558
559			int
560			EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
561		265	{
562	✓✗	265	if (c->cipher != NULL) {
563	✗✓✗✗	265	if (c->cipher->cleanup && !c->cipher->cleanup(c))
564			return 0;
565			/* Cleanse cipher context data */
566	✓✗	265	if (c->cipher_data)
567		265	explicit_bzero(c->cipher_data, c->cipher->ctx_size);
568			}
569		265	free(c->cipher_data);
570			#ifndef OPENSSL_NO_ENGINE
571	✗✓	265	if (c->engine)
572			/* The EVP_CIPHER we used belongs to an ENGINE, release the
573			* functional reference we held for this reason. */
574			ENGINE_finish(c->engine);
575			#endif
576		265	explicit_bzero(c, sizeof(EVP_CIPHER_CTX));
577		265	return 1;
578			}
579
580			int
581			EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
582			{
583			if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
584			return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH,
585			keylen, NULL);
586			if (c->key_len == keylen)
587			return 1;
588			if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
589			c->key_len = keylen;
590			return 1;
591			}
592			EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
593			return 0;
594			}
595
596			int
597			EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
598		251	{
599	✗✓	251	if (pad)
600			ctx->flags &= ~EVP_CIPH_NO_PADDING;
601			else
602		251	ctx->flags \|= EVP_CIPH_NO_PADDING;
603		251	return 1;
604			}
605
606			int
607			EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX ctx, int type, int arg, void ptr)
608		24	{
609			int ret;
610
611	✗✓	24	if (!ctx->cipher) {
612			EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
613			return 0;
614			}
615
616	✗✓	24	if (!ctx->cipher->ctrl) {
617			EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
618			return 0;
619			}
620
621		24	ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
622	✗✓	24	if (ret == -1) {
623			EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
624			EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
625			return 0;
626			}
627		24	return ret;
628			}
629
630			int
631			EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX ctx, unsigned char key)
632		2	{
633	✗✓	2	if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
634			return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
635		2	arc4random_buf(key, ctx->key_len);
636		2	return 1;
637			}
638
639			int
640			EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX out, const EVP_CIPHER_CTX in)
641			{
642			if ((in == NULL) \|\| (in->cipher == NULL)) {
643			EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
644			return 0;
645			}
646			#ifndef OPENSSL_NO_ENGINE
647			/* Make sure it's safe to copy a cipher context using an ENGINE */
648			if (in->engine && !ENGINE_init(in->engine)) {
649			EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
650			return 0;
651			}
652			#endif
653
654			EVP_CIPHER_CTX_cleanup(out);
655			memcpy(out, in, sizeof *out);
656
657			if (in->cipher_data && in->cipher->ctx_size) {
658			out->cipher_data = malloc(in->cipher->ctx_size);
659			if (!out->cipher_data) {
660			EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
661			return 0;
662			}
663			memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
664			}
665
666			if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
667			return in->cipher->ctrl((EVP_CIPHER_CTX *)in,
668			EVP_CTRL_COPY, 0, out);
669			return 1;
670			}