/* crypto/evp/evp.h */

/* 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.]

 */

#ifndef HEADER_ENVELOPE_H

#define HEADER_ENVELOPE_H

#ifdef OPENSSL_ALGORITHM_DEFINES

# include <openssl/opensslconf.h>

#else

# define OPENSSL_ALGORITHM_DEFINES

# include <openssl/opensslconf.h>

# undef OPENSSL_ALGORITHM_DEFINES

#endif

#include <openssl/ossl_typ.h>

#include <openssl/symhacks.h>

#ifndef OPENSSL_NO_BIO

#include <openssl/bio.h>

#endif

#ifndef OPENSSL_NO_MD2

#include <openssl/md2.h>

#endif

#ifndef OPENSSL_NO_MD4

#include <openssl/md4.h>

#endif

#ifndef OPENSSL_NO_MD5

#include <openssl/md5.h>

#endif

#ifndef OPENSSL_NO_SHA

#include <openssl/sha.h>

#endif

#ifndef OPENSSL_NO_RIPEMD

#include <openssl/ripemd.h>

#endif

#ifndef OPENSSL_NO_DES

#include <openssl/des.h>

#endif

#ifndef OPENSSL_NO_RC4

#include <openssl/rc4.h>

#endif

#ifndef OPENSSL_NO_RC2

#include <openssl/rc2.h>

#endif

#ifndef OPENSSL_NO_RC5

#include <openssl/rc5.h>

#endif

#ifndef OPENSSL_NO_BF

#include <openssl/blowfish.h>

#endif

#ifndef OPENSSL_NO_CAST

#include <openssl/cast.h>

#endif

#ifndef OPENSSL_NO_IDEA

#include <openssl/idea.h>

#endif

#ifndef OPENSSL_NO_MDC2

#include <openssl/mdc2.h>

#endif

#ifndef OPENSSL_NO_AES

#include <openssl/aes.h>

#endif

/*

#define EVP_RC2_KEY_SIZE		16

#define EVP_RC4_KEY_SIZE		16

#define EVP_BLOWFISH_KEY_SIZE		16

#define EVP_CAST5_KEY_SIZE		16

#define EVP_RC5_32_12_16_KEY_SIZE	16

*/

#define EVP_MAX_MD_SIZE			(16+20) /* The SSLv3 md5+sha1 type */

#define EVP_MAX_KEY_LENGTH		32

#define EVP_MAX_IV_LENGTH		16

#define EVP_MAX_BLOCK_LENGTH		32

#define PKCS5_SALT_LEN			8

/* Default PKCS#5 iteration count */

#define PKCS5_DEFAULT_ITER		2048

#ifndef OPENSSL_NO_RSA

#include <openssl/rsa.h>

#endif

#ifndef OPENSSL_NO_DSA

#include <openssl/dsa.h>

#endif

#ifndef OPENSSL_NO_DH

#include <openssl/dh.h>

#endif

#include <openssl/objects.h>

#define EVP_PK_RSA	0x0001

#define EVP_PK_DSA	0x0002

#define EVP_PK_DH	0x0004

#define EVP_PKT_SIGN	0x0010

#define EVP_PKT_ENC	0x0020

#define EVP_PKT_EXCH	0x0040

#define EVP_PKS_RSA	0x0100

#define EVP_PKS_DSA	0x0200

#define EVP_PKT_EXP	0x1000 /* <= 512 bit key */

#define EVP_PKEY_NONE	NID_undef

#define EVP_PKEY_RSA	NID_rsaEncryption

#define EVP_PKEY_RSA2	NID_rsa

#define EVP_PKEY_DSA	NID_dsa

#define EVP_PKEY_DSA1	NID_dsa_2

#define EVP_PKEY_DSA2	NID_dsaWithSHA

#define EVP_PKEY_DSA3	NID_dsaWithSHA1

#define EVP_PKEY_DSA4	NID_dsaWithSHA1_2

#define EVP_PKEY_DH	NID_dhKeyAgreement

#ifdef	__cplusplus

extern "C" {

#endif

/* Type needs to be a bit field

 * Sub-type needs to be for variations on the method, as in, can it do

 * arbitrary encryption.... */

struct evp_pkey_st

	{

	int type;

	int save_type;

	int references;

	union	{

		char *ptr;

#ifndef OPENSSL_NO_RSA

		struct rsa_st *rsa;	/* RSA */

#endif

#ifndef OPENSSL_NO_DSA

		struct dsa_st *dsa;	/* DSA */

#endif

#ifndef OPENSSL_NO_DH

		struct dh_st *dh;	/* DH */

#endif

		} pkey;

	int save_parameters;

	STACK_OF(X509_ATTRIBUTE) *attributes; /* [ 0 ] */

	} /* EVP_PKEY */;

#define EVP_PKEY_MO_SIGN	0x0001

#define EVP_PKEY_MO_VERIFY	0x0002

#define EVP_PKEY_MO_ENCRYPT	0x0004

#define EVP_PKEY_MO_DECRYPT	0x0008

#if 0

/* This structure is required to tie the message digest and signing together.

 * The lookup can be done by md/pkey_method, oid, oid/pkey_method, or

 * oid, md and pkey.

 * This is required because for various smart-card perform the digest and

 * signing/verification on-board.  To handle this case, the specific

 * EVP_MD and EVP_PKEY_METHODs need to be closely associated.

 * When a PKEY is created, it will have a EVP_PKEY_METHOD associated with it.

 * This can either be software or a token to provide the required low level

 * routines.

 */

typedef struct evp_pkey_md_st

	{

	int oid;

	EVP_MD *md;

	EVP_PKEY_METHOD *pkey;

	} EVP_PKEY_MD;

#define EVP_rsa_md2() \

		EVP_PKEY_MD_add(NID_md2WithRSAEncryption,\

			EVP_rsa_pkcs1(),EVP_md2())

#define EVP_rsa_md5() \

		EVP_PKEY_MD_add(NID_md5WithRSAEncryption,\

			EVP_rsa_pkcs1(),EVP_md5())

#define EVP_rsa_sha0() \

		EVP_PKEY_MD_add(NID_shaWithRSAEncryption,\

			EVP_rsa_pkcs1(),EVP_sha())

#define EVP_rsa_sha1() \

		EVP_PKEY_MD_add(NID_sha1WithRSAEncryption,\

			EVP_rsa_pkcs1(),EVP_sha1())

#define EVP_rsa_ripemd160() \

		EVP_PKEY_MD_add(NID_ripemd160WithRSA,\

			EVP_rsa_pkcs1(),EVP_ripemd160())

#define EVP_rsa_mdc2() \

		EVP_PKEY_MD_add(NID_mdc2WithRSA,\

			EVP_rsa_octet_string(),EVP_mdc2())

#define EVP_dsa_sha() \

		EVP_PKEY_MD_add(NID_dsaWithSHA,\

			EVP_dsa(),EVP_sha())

#define EVP_dsa_sha1() \

		EVP_PKEY_MD_add(NID_dsaWithSHA1,\

			EVP_dsa(),EVP_sha1())

typedef struct evp_pkey_method_st

	{

	char *name;

	int flags;

	int type;		/* RSA, DSA, an SSLeay specific constant */

	int oid;		/* For the pub-key type */

	int encrypt_oid;	/* pub/priv key encryption */

	int (*sign)();

	int (*verify)();

	struct	{

		int (*set)();	/* get and/or set the underlying type */

		int (*get)();

		int (*encrypt)();

		int (*decrypt)();

		int (*i2d)();

		int (*d2i)();

		int (*dup)();

		} pub,priv;

	int (*set_asn1_parameters)();

	int (*get_asn1_parameters)();

	} EVP_PKEY_METHOD;

#endif

#ifndef EVP_MD

struct env_md_st

	{

	int type;

	int pkey_type;

	int md_size;

	unsigned long flags;

	int (*init)(EVP_MD_CTX *ctx);

	int (*update)(EVP_MD_CTX *ctx,const void *data,unsigned long count);

	int (*final)(EVP_MD_CTX *ctx,unsigned char *md);

	int (*copy)(EVP_MD_CTX *to,const EVP_MD_CTX *from);

	int (*cleanup)(EVP_MD_CTX *ctx);

	/* FIXME: prototype these some day */

	int (*sign)();

	int (*verify)();

	int required_pkey_type[5]; /*EVP_PKEY_xxx */

	int block_size;

	int ctx_size; /* how big does the ctx->md_data need to be */

	} /* EVP_MD */;

#define EVP_MD_FLAG_ONESHOT	0x0001 /* digest can only handle a single

					* block */

#define EVP_PKEY_NULL_method	NULL,NULL,{0,0,0,0}

#ifndef OPENSSL_NO_DSA

#define EVP_PKEY_DSA_method	DSA_sign,DSA_verify, \

				{EVP_PKEY_DSA,EVP_PKEY_DSA2,EVP_PKEY_DSA3, \

					EVP_PKEY_DSA4,0}

#else

#define EVP_PKEY_DSA_method	EVP_PKEY_NULL_method

#endif

#ifndef OPENSSL_NO_RSA

#define EVP_PKEY_RSA_method	RSA_sign,RSA_verify, \

				{EVP_PKEY_RSA,EVP_PKEY_RSA2,0,0}

#define EVP_PKEY_RSA_ASN1_OCTET_STRING_method \

				RSA_sign_ASN1_OCTET_STRING, \

				RSA_verify_ASN1_OCTET_STRING, \

				{EVP_PKEY_RSA,EVP_PKEY_RSA2,0,0}

#else

#define EVP_PKEY_RSA_method	EVP_PKEY_NULL_method

#define EVP_PKEY_RSA_ASN1_OCTET_STRING_method EVP_PKEY_NULL_method

#endif

#endif /* !EVP_MD */

struct env_md_ctx_st

	{

	const EVP_MD *digest;

	ENGINE *engine; /* functional reference if 'digest' is ENGINE-provided */

	unsigned long flags;

	void *md_data;

	} /* EVP_MD_CTX */;

/* values for EVP_MD_CTX flags */

#define EVP_MD_CTX_FLAG_ONESHOT		0x0001 /* digest update will be called

						* once only */

#define EVP_MD_CTX_FLAG_CLEANED		0x0002 /* context has already been

						* cleaned */

struct evp_cipher_st

	{

	int nid;

	int block_size;

	int key_len;		/* Default value for variable length ciphers */

	int iv_len;

	unsigned long flags;	/* Various flags */

	int (*init)(EVP_CIPHER_CTX *ctx, const unsigned char *key,

		    const unsigned char *iv, int enc);	/* init key */

	int (*do_cipher)(EVP_CIPHER_CTX *ctx, unsigned char *out,

			 const unsigned char *in, unsigned int inl);/* encrypt/decrypt data */

	int (*cleanup)(EVP_CIPHER_CTX *); /* cleanup ctx */

	int ctx_size;		/* how big ctx->cipher_data needs to be */

	int (*set_asn1_parameters)(EVP_CIPHER_CTX *, ASN1_TYPE *); /* Populate a ASN1_TYPE with parameters */

	int (*get_asn1_parameters)(EVP_CIPHER_CTX *, ASN1_TYPE *); /* Get parameters from a ASN1_TYPE */

	int (*ctrl)(EVP_CIPHER_CTX *, int type, int arg, void *ptr); /* Miscellaneous operations */

	void *app_data;		/* Application data */

	} /* EVP_CIPHER */;

/* Values for cipher flags */

/* Modes for ciphers */

#define		EVP_CIPH_STREAM_CIPHER		0x0

#define		EVP_CIPH_ECB_MODE		0x1

#define		EVP_CIPH_CBC_MODE		0x2

#define		EVP_CIPH_CFB_MODE		0x3

#define		EVP_CIPH_OFB_MODE		0x4

#define 	EVP_CIPH_MODE			0x7

/* Set if variable length cipher */

#define 	EVP_CIPH_VARIABLE_LENGTH	0x8

/* Set if the iv handling should be done by the cipher itself */

#define 	EVP_CIPH_CUSTOM_IV		0x10

/* Set if the cipher's init() function should be called if key is NULL */

#define 	EVP_CIPH_ALWAYS_CALL_INIT	0x20

/* Call ctrl() to init cipher parameters */

#define 	EVP_CIPH_CTRL_INIT		0x40

/* Don't use standard key length function */

#define 	EVP_CIPH_CUSTOM_KEY_LENGTH	0x80

/* Don't use standard block padding */

#define 	EVP_CIPH_NO_PADDING		0x100

/* ctrl() values */

#define		EVP_CTRL_INIT			0x0

#define 	EVP_CTRL_SET_KEY_LENGTH		0x1

#define 	EVP_CTRL_GET_RC2_KEY_BITS	0x2

#define 	EVP_CTRL_SET_RC2_KEY_BITS	0x3

#define 	EVP_CTRL_GET_RC5_ROUNDS		0x4

#define 	EVP_CTRL_SET_RC5_ROUNDS		0x5

typedef struct evp_cipher_info_st

	{

	const EVP_CIPHER *cipher;

	unsigned char iv[EVP_MAX_IV_LENGTH];

	} EVP_CIPHER_INFO;

struct evp_cipher_ctx_st

	{

	const EVP_CIPHER *cipher;

	ENGINE *engine;	/* functional reference if 'cipher' is ENGINE-provided */

	int encrypt;		/* encrypt or decrypt */

	int buf_len;		/* number we have left */

	unsigned char  oiv[EVP_MAX_IV_LENGTH];	/* original iv */

	unsigned char  iv[EVP_MAX_IV_LENGTH];	/* working iv */

	unsigned char buf[EVP_MAX_BLOCK_LENGTH];/* saved partial block */

	int num;				/* used by cfb/ofb mode */

	void *app_data;		/* application stuff */

	int key_len;		/* May change for variable length cipher */

	unsigned long flags;	/* Various flags */

	void *cipher_data; /* per EVP data */

	int final_used;

	int block_mask;

	unsigned char final[EVP_MAX_BLOCK_LENGTH];/* possible final block */

	} /* EVP_CIPHER_CTX */;

typedef struct evp_Encode_Ctx_st

	{

	int num;	/* number saved in a partial encode/decode */

	int length;	/* The length is either the output line length

			 * (in input bytes) or the shortest input line

			 * length that is ok.  Once decoding begins,

			 * the length is adjusted up each time a longer

			 * line is decoded */

	unsigned char enc_data[80];	/* data to encode */

	int line_num;	/* number read on current line */

	int expect_nl;

	} EVP_ENCODE_CTX;

/* Password based encryption function */

typedef int (EVP_PBE_KEYGEN)(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,

		ASN1_TYPE *param, const EVP_CIPHER *cipher,

                const EVP_MD *md, int en_de);

#ifndef OPENSSL_NO_RSA

#define EVP_PKEY_assign_RSA(pkey,rsa) EVP_PKEY_assign((pkey),EVP_PKEY_RSA,\

					(char *)(rsa))

#endif

#ifndef OPENSSL_NO_DSA

#define EVP_PKEY_assign_DSA(pkey,dsa) EVP_PKEY_assign((pkey),EVP_PKEY_DSA,\

					(char *)(dsa))

#endif

#ifndef OPENSSL_NO_DH

#define EVP_PKEY_assign_DH(pkey,dh) EVP_PKEY_assign((pkey),EVP_PKEY_DH,\

					(char *)(dh))

#endif

/* Add some extra combinations */

#define EVP_get_digestbynid(a) EVP_get_digestbyname(OBJ_nid2sn(a))

#define EVP_get_digestbyobj(a) EVP_get_digestbynid(OBJ_obj2nid(a))

#define EVP_get_cipherbynid(a) EVP_get_cipherbyname(OBJ_nid2sn(a))

#define EVP_get_cipherbyobj(a) EVP_get_cipherbynid(OBJ_obj2nid(a))

#define EVP_MD_type(e)			((e)->type)

#define EVP_MD_nid(e)			EVP_MD_type(e)

#define EVP_MD_name(e)			OBJ_nid2sn(EVP_MD_nid(e))

#define EVP_MD_pkey_type(e)		((e)->pkey_type)

#define EVP_MD_size(e)			((e)->md_size)

#define EVP_MD_block_size(e)		((e)->block_size)

#define EVP_MD_CTX_md(e)		((e)->digest)

#define EVP_MD_CTX_size(e)		EVP_MD_size((e)->digest)

#define EVP_MD_CTX_block_size(e)	EVP_MD_block_size((e)->digest)

#define EVP_MD_CTX_type(e)		EVP_MD_type((e)->digest)

#define EVP_CIPHER_nid(e)		((e)->nid)

#define EVP_CIPHER_name(e)		OBJ_nid2sn(EVP_CIPHER_nid(e))

#define EVP_CIPHER_block_size(e)	((e)->block_size)

#define EVP_CIPHER_key_length(e)	((e)->key_len)

#define EVP_CIPHER_iv_length(e)		((e)->iv_len)

#define EVP_CIPHER_flags(e)		((e)->flags)

#define EVP_CIPHER_mode(e)		(((e)->flags) & EVP_CIPH_MODE)

#define EVP_CIPHER_CTX_cipher(e)	((e)->cipher)

#define EVP_CIPHER_CTX_nid(e)		((e)->cipher->nid)

#define EVP_CIPHER_CTX_block_size(e)	((e)->cipher->block_size)

#define EVP_CIPHER_CTX_key_length(e)	((e)->key_len)

#define EVP_CIPHER_CTX_iv_length(e)	((e)->cipher->iv_len)

#define EVP_CIPHER_CTX_get_app_data(e)	((e)->app_data)

#define EVP_CIPHER_CTX_set_app_data(e,d) ((e)->app_data=(char *)(d))

#define EVP_CIPHER_CTX_type(c)         EVP_CIPHER_type(EVP_CIPHER_CTX_cipher(c))

#define EVP_CIPHER_CTX_flags(e)		((e)->cipher->flags)

#define EVP_CIPHER_CTX_mode(e)		((e)->cipher->flags & EVP_CIPH_MODE)

#define EVP_ENCODE_LENGTH(l)	(((l+2)/3*4)+(l/48+1)*2+80)

#define EVP_DECODE_LENGTH(l)	((l+3)/4*3+80)

#define EVP_SignInit_ex(a,b,c)		EVP_DigestInit_ex(a,b,c)

#define EVP_SignInit(a,b)		EVP_DigestInit(a,b)

#define EVP_SignUpdate(a,b,c)		EVP_DigestUpdate(a,b,c)

#define	EVP_VerifyInit_ex(a,b,c)	EVP_DigestInit_ex(a,b,c)

#define	EVP_VerifyInit(a,b)		EVP_DigestInit(a,b)

#define	EVP_VerifyUpdate(a,b,c)		EVP_DigestUpdate(a,b,c)

#define EVP_OpenUpdate(a,b,c,d,e)	EVP_DecryptUpdate(a,b,c,d,e)

#define EVP_SealUpdate(a,b,c,d,e)	EVP_EncryptUpdate(a,b,c,d,e)	

#ifdef CONST_STRICT

void BIO_set_md(BIO *,const EVP_MD *md);

#else

# define BIO_set_md(b,md)		BIO_ctrl(b,BIO_C_SET_MD,0,(char *)md)

#endif

#define BIO_get_md(b,mdp)		BIO_ctrl(b,BIO_C_GET_MD,0,(char *)mdp)

#define BIO_get_md_ctx(b,mdcp)     BIO_ctrl(b,BIO_C_GET_MD_CTX,0,(char *)mdcp)

#define BIO_get_cipher_status(b)	BIO_ctrl(b,BIO_C_GET_CIPHER_STATUS,0,NULL)

#define BIO_get_cipher_ctx(b,c_pp)	BIO_ctrl(b,BIO_C_GET_CIPHER_CTX,0,(char *)c_pp)

#define	EVP_Cipher(c,o,i,l)	(c)->cipher->do_cipher((c),(o),(i),(l))

#define EVP_add_cipher_alias(n,alias) \

	OBJ_NAME_add((alias),OBJ_NAME_TYPE_CIPHER_METH|OBJ_NAME_ALIAS,(n))

#define EVP_add_digest_alias(n,alias) \

	OBJ_NAME_add((alias),OBJ_NAME_TYPE_MD_METH|OBJ_NAME_ALIAS,(n))

#define EVP_delete_cipher_alias(alias) \

	OBJ_NAME_remove(alias,OBJ_NAME_TYPE_CIPHER_METH|OBJ_NAME_ALIAS);

#define EVP_delete_digest_alias(alias) \

	OBJ_NAME_remove(alias,OBJ_NAME_TYPE_MD_METH|OBJ_NAME_ALIAS);

void	EVP_MD_CTX_init(EVP_MD_CTX *ctx);

int	EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx);

EVP_MD_CTX *EVP_MD_CTX_create(void);

void	EVP_MD_CTX_destroy(EVP_MD_CTX *ctx);

int     EVP_MD_CTX_copy_ex(EVP_MD_CTX *out,const EVP_MD_CTX *in);  

#define EVP_MD_CTX_set_flags(ctx,flgs) ((ctx)->flags|=(flgs))

#define EVP_MD_CTX_clear_flags(ctx,flgs) ((ctx)->flags&=~(flgs))

#define EVP_MD_CTX_test_flags(ctx,flgs) ((ctx)->flags&(flgs))

int	EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl);

int	EVP_DigestUpdate(EVP_MD_CTX *ctx,const void *d,

			 unsigned int cnt);

int	EVP_DigestFinal_ex(EVP_MD_CTX *ctx,unsigned char *md,unsigned int *s);

int	EVP_Digest(void *data, unsigned int count,

		unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl);

int     EVP_MD_CTX_copy(EVP_MD_CTX *out,const EVP_MD_CTX *in);