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/*
 * crypto.h - public data structures and prototypes for the crypto library
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Netscape security libraries.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1994-2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Dr Vipul Gupta <vipul.gupta@sun.com>, Sun Microsystems Laboratories
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
/* $Id: cryptohi.h,v 1.15 2010/08/12 01:15:37 wtc%google.com Exp $ */

#ifndef _CRYPTOHI_H_
#define _CRYPTOHI_H_

#include "blapit.h"

#include "seccomon.h"
#include "secoidt.h"
#include "secdert.h"
#include "cryptoht.h"
#include "keyt.h"
#include "certt.h"


SEC_BEGIN_PROTOS


/****************************************/
/*
** DER encode/decode (EC)DSA signatures
*/

/* ANSI X9.57 defines DSA signatures as DER encoded data.  Our DSA code (and
 * most of the rest of the world) just generates 40 bytes of raw data.  These
 * functions convert between formats.
 */
extern SECStatus DSAU_EncodeDerSig(SECItem *dest, SECItem *src);
extern SECItem *DSAU_DecodeDerSig(const SECItem *item);

/*
 * Unlike DSA, raw ECDSA signatures do not have a fixed length.
 * Rather they contain two integers r and s whose length depends
 * on the size of the EC key used for signing.
 *
 * We can reuse the DSAU_EncodeDerSig interface to DER encode
 * raw ECDSA signature keeping in mind that the length of r 
 * is the same as that of s and exactly half of src->len.
 *
 * For decoding, we need to pass the length of the desired
 * raw signature (twice the key size) explicitly.
 */
extern SECStatus DSAU_EncodeDerSigWithLen(SECItem *dest, SECItem *src, 
					  unsigned int len);
extern SECItem *DSAU_DecodeDerSigToLen(const SECItem *item, unsigned int len);

/****************************************/
/*
** Signature creation operations
*/

/*
** Create a new signature context used for signing a data stream.
**	"alg" the signature algorithm to use (e.g. SEC_OID_RSA_WITH_MD5)
**	"privKey" the private key to use
*/
extern SGNContext *SGN_NewContext(SECOidTag alg, SECKEYPrivateKey *privKey);

/*
** Destroy a signature-context object
**	"key" the object
**	"freeit" if PR_TRUE then free the object as well as its sub-objects
*/
extern void SGN_DestroyContext(SGNContext *cx, PRBool freeit);

/*
** Reset the signing context "cx" to its initial state, preparing it for
** another stream of data.
*/
extern SECStatus SGN_Begin(SGNContext *cx);

/*
** Update the signing context with more data to sign.
**	"cx" the context
**	"input" the input data to sign
**	"inputLen" the length of the input data
*/
extern SECStatus SGN_Update(SGNContext *cx, const unsigned char *input,
			   unsigned int inputLen);

/*
** Finish the signature process. Use either k0 or k1 to sign the data
** stream that was input using SGN_Update. The resulting signature is
** formatted using PKCS#1 and then encrypted using RSA private or public
** encryption.
**	"cx" the context
**	"result" the final signature data (memory is allocated)
*/
extern SECStatus SGN_End(SGNContext *cx, SECItem *result);

/*
** Sign a single block of data using private key encryption and given
** signature/hash algorithm.
**	"result" the final signature data (memory is allocated)
**	"buf" the input data to sign
**	"len" the amount of data to sign
**	"pk" the private key to encrypt with
**	"algid" the signature/hash algorithm to sign with 
**		(must be compatible with the key type).
*/
extern SECStatus SEC_SignData(SECItem *result,
			     const unsigned char *buf, int len,
			     SECKEYPrivateKey *pk, SECOidTag algid);

/*
** Sign a pre-digested block of data using private key encryption, encoding
**  The given signature/hash algorithm.
**	"result" the final signature data (memory is allocated)
**	"digest" the digest to sign
**	"pk" the private key to encrypt with
**	"algtag" The algorithm tag to encode (need for RSA only)
*/
extern SECStatus SGN_Digest(SECKEYPrivateKey *privKey,
                SECOidTag algtag, SECItem *result, SECItem *digest);

/*
** DER sign a single block of data using private key encryption and the
** MD5 hashing algorithm. This routine first computes a digital signature
** using SEC_SignData, then wraps it with an CERTSignedData and then der
** encodes the result.
**	"arena" is the memory arena to use to allocate data from
** 	"result" the final der encoded data (memory is allocated)
** 	"buf" the input data to sign
** 	"len" the amount of data to sign
** 	"pk" the private key to encrypt with
*/
extern SECStatus SEC_DerSignData(PLArenaPool *arena, SECItem *result,
				const unsigned char *buf, int len,
				SECKEYPrivateKey *pk, SECOidTag algid);

/*
** Destroy a signed-data object.
**	"sd" the object
**	"freeit" if PR_TRUE then free the object as well as its sub-objects
*/
extern void SEC_DestroySignedData(CERTSignedData *sd, PRBool freeit);

/*
** Get the signature algorithm tag number for the given key type and hash
** algorithm tag. Returns SEC_OID_UNKNOWN if key type and hash algorithm
** do not match or are not supported.
*/
extern SECOidTag SEC_GetSignatureAlgorithmOidTag(KeyType keyType,
                                                 SECOidTag hashAlgTag);

/****************************************/
/*
** Signature verification operations
*/

/*
** Create a signature verification context. This version is deprecated,
**  This function is deprecated. Use VFY_CreateContextDirect or 
**  VFY_CreateContextWithAlgorithmID instead.
**	"key" the public key to verify with
**	"sig" the encrypted signature data if sig is NULL then
**	   VFY_EndWithSignature must be called with the correct signature at
**	   the end of the processing.
**	"sigAlg" specifies the signing algorithm to use (including the 
**         hash algorthim).  This must match the key type.
**	"wincx" void pointer to the window context
*/
extern VFYContext *VFY_CreateContext(SECKEYPublicKey *key, SECItem *sig,
				     SECOidTag sigAlg, void *wincx);
/*
** Create a signature verification context.
**	"key" the public key to verify with
**	"sig" the encrypted signature data if sig is NULL then
**	   VFY_EndWithSignature must be called with the correct signature at
**	   the end of the processing.
**	"pubkAlg" specifies the cryptographic signing algorithm to use (the
**         raw algorithm without any hash specified.  This must match the key 
**         type.
**	"hashAlg" specifies the hashing algorithm used. If the key is an 
**	   RSA key, and sig is not NULL, then hashAlg can be SEC_OID_UNKNOWN.
**	   the hash is selected from data in the sig.
**	"hash" optional pointer to return the actual hash algorithm used.
**	   in practice this should always match the passed in hashAlg (the
**	   exception is the case where hashAlg is SEC_OID_UNKNOWN above).
**         If this value is NULL no, hash oid is returned.
**	"wincx" void pointer to the window context
*/
extern VFYContext *VFY_CreateContextDirect(const SECKEYPublicKey *key,
					   const SECItem *sig,
	     				   SECOidTag pubkAlg, 
					   SECOidTag hashAlg, 
					   SECOidTag *hash, void *wincx);
/*
** Create a signature verification context from a algorithm ID.
**	"key" the public key to verify with
**	"sig" the encrypted signature data if sig is NULL then
**	   VFY_EndWithSignature must be called with the correct signature at
**	   the end of the processing.
**	"algid" specifies the signing algorithm and parameters to use.
**         This must match the key type.
**      "hash" optional pointer to return the oid of the actual hash used in 
**         the signature. If this value is NULL no, hash oid is returned.
**	"wincx" void pointer to the window context
*/
extern VFYContext *VFY_CreateContextWithAlgorithmID(const SECKEYPublicKey *key, 
				     const SECItem *sig,
				     const SECAlgorithmID *algid, 
				     SECOidTag *hash,
				     void *wincx);

/*
** Destroy a verification-context object.
**	"cx" the context to destroy
**	"freeit" if PR_TRUE then free the object as well as its sub-objects
*/
extern void VFY_DestroyContext(VFYContext *cx, PRBool freeit);

extern SECStatus VFY_Begin(VFYContext *cx);

/*
** Update a verification context with more input data. The input data
** is fed to a secure hash function (depending on what was in the
** encrypted signature data).
**	"cx" the context
**	"input" the input data
**	"inputLen" the amount of input data
*/
extern SECStatus VFY_Update(VFYContext *cx, const unsigned char *input,
			    unsigned int inputLen);

/*
** Finish the verification process. The return value is a status which
** indicates success or failure. On success, the SECSuccess value is
** returned. Otherwise, SECFailure is returned and the error code found
** using PORT_GetError() indicates what failure occurred.
** 	"cx" the context
*/
extern SECStatus VFY_End(VFYContext *cx);

/*
** Finish the verification process. The return value is a status which
** indicates success or failure. On success, the SECSuccess value is
** returned. Otherwise, SECFailure is returned and the error code found
** using PORT_GetError() indicates what failure occurred. If signature is
** supplied the verification uses this signature to verify, otherwise the
** signature passed in VFY_CreateContext() is used. 
** VFY_EndWithSignature(cx,NULL); is identical to VFY_End(cx);.
** 	"cx" the context
** 	"sig" the encrypted signature data
*/
extern SECStatus VFY_EndWithSignature(VFYContext *cx, SECItem *sig);


/*
** Verify the signature on a block of data for which we already have
** the digest. The signature data is an RSA private key encrypted
** block of data formatted according to PKCS#1.
**  This function is deprecated. Use VFY_VerifyDigestDirect or 
**  VFY_VerifyDigestWithAlgorithmID instead.
** 	"dig" the digest
** 	"key" the public key to check the signature with
** 	"sig" the encrypted signature data
**	"sigAlg" specifies the signing algorithm to use.  This must match
**	    the key type.
**	"wincx" void pointer to the window context
**/
extern SECStatus VFY_VerifyDigest(SECItem *dig, SECKEYPublicKey *key,
				  SECItem *sig, SECOidTag sigAlg, void *wincx);
/*
** Verify the signature on a block of data for which we already have
** the digest. The signature data is an RSA private key encrypted
** block of data formatted according to PKCS#1.
** 	"dig" the digest
** 	"key" the public key to check the signature with
** 	"sig" the encrypted signature data
**	"pubkAlg" specifies the cryptographic signing algorithm to use (the
**         raw algorithm without any hash specified.  This must match the key 
**         type.
**	"hashAlg" specifies the hashing algorithm used.
**	"wincx" void pointer to the window context
**/
extern SECStatus VFY_VerifyDigestDirect(const SECItem *dig, 
					const SECKEYPublicKey *key,
					const SECItem *sig, SECOidTag pubkAlg, 
					SECOidTag hashAlg, void *wincx);
/*
** Verify the signature on a block of data for which we already have
** the digest. The signature data is an RSA private key encrypted
** block of data formatted according to PKCS#1.
**	"key" the public key to verify with
**	"sig" the encrypted signature data if sig is NULL then
**	   VFY_EndWithSignature must be called with the correct signature at
**	   the end of the processing.
**	"algid" specifies the signing algorithm and parameters to use.
**         This must match the key type.
**      "hash" oid of the actual hash used to create digest. If this  value is
**         not set to SEC_OID_UNKNOWN, it must match the hash of the signature.
**	"wincx" void pointer to the window context
*/
extern SECStatus VFY_VerifyDigestWithAlgorithmID(const SECItem *dig, 
				const SECKEYPublicKey *key, const SECItem *sig,
				const SECAlgorithmID *algid, SECOidTag hash,
				void *wincx);

/*
** Verify the signature on a block of data. The signature data is an RSA
** private key encrypted block of data formatted according to PKCS#1.
**   This function is deprecated. Use VFY_VerifyDataDirect or 
**   VFY_VerifyDataWithAlgorithmID instead.
** 	"buf" the input data
** 	"len" the length of the input data
** 	"key" the public key to check the signature with
** 	"sig" the encrypted signature data
**	"sigAlg" specifies the signing algorithm to use.  This must match
**	    the key type.
**	"wincx" void pointer to the window context
*/
extern SECStatus VFY_VerifyData(const unsigned char *buf, int len,
				const SECKEYPublicKey *key, const SECItem *sig,
				SECOidTag sigAlg, void *wincx);
/*
** Verify the signature on a block of data. The signature data is an RSA
** private key encrypted block of data formatted according to PKCS#1.
** 	"buf" the input data
** 	"len" the length of the input data
** 	"key" the public key to check the signature with
** 	"sig" the encrypted signature data
**	"pubkAlg" specifies the cryptographic signing algorithm to use (the
**         raw algorithm without any hash specified.  This must match the key 
**         type.
**	"hashAlg" specifies the hashing algorithm used. If the key is an 
**	   RSA key, and sig is not NULL, then hashAlg can be SEC_OID_UNKNOWN.
**	   the hash is selected from data in the sig.
**	"hash" optional pointer to return the actual hash algorithm used.
**	   in practice this should always match the passed in hashAlg (the
**	   exception is the case where hashAlg is SEC_OID_UNKNOWN above).
**         If this value is NULL no, hash oid is returned.
**	"wincx" void pointer to the window context
*/
extern SECStatus VFY_VerifyDataDirect(const unsigned char *buf, int len,
				      const SECKEYPublicKey *key, 
				      const SECItem *sig,
				      SECOidTag pubkAlg, SECOidTag hashAlg, 
				      SECOidTag *hash, void *wincx);

/*
** Verify the signature on a block of data. The signature data is an RSA
** private key encrypted block of data formatted according to PKCS#1.
** 	"buf" the input data
** 	"len" the length of the input data
** 	"key" the public key to check the signature with
** 	"sig" the encrypted signature data
**	"algid" specifies the signing algorithm and parameters to use.
**         This must match the key type.
**      "hash" optional pointer to return the oid of the actual hash used in 
**         the signature. If this value is NULL no, hash oid is returned.
**	"wincx" void pointer to the window context
*/
extern SECStatus VFY_VerifyDataWithAlgorithmID(const unsigned char *buf, 
				int len, const SECKEYPublicKey *key,
				const SECItem *sig,
				const SECAlgorithmID *algid, SECOidTag *hash,
				void *wincx);


SEC_END_PROTOS

#endif /* _CRYPTOHI_H_ */