/*
	File:		libCdsaCrypt.h
        
        Contains:	simple high-level CDSA access routines.
        
	Copyright: 	© Copyright 2002 Apple Computer, Inc. All rights reserved.
	
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	Change History (most recent first):
                11/4/02		1.0d1

*/


#ifndef	_LIB_CDSA_CRYPT_H_
#define _LIB_CDSA_CRYPT_H_

#ifdef	__cplusplus
extern "C" {
#endif

#include <Security/cssm.h>

/*
 * Initialize CDSA and attach to the CSP.
 */
CSSM_RETURN cdsaCspAttach(
	CSSM_CSP_HANDLE		*cspHandle);
	
/*
 * Detach from CSP. To be called when app is finished with this 
 * library.
 */
CSSM_RETURN cdsaCspDetach(
	CSSM_CSP_HANDLE		cspHandle);
 
#pragma mark ------ Key generation ------

/*
 * Derive a CSSM_KEY from the specified raw key material.
 */
CSSM_RETURN cdsaDeriveKey(
	CSSM_CSP_HANDLE		cspHandle,		// from cdsaCspAttach()
	const void 			*rawKey,		
	size_t				rawKeyLen,
	CSSM_ALGORITHMS		keyAlg,			// e.g., CSSM_ALGID_AES
	uint32				keySizeInBits,
	CSSM_KEY_PTR		key);
	
/*
 * Generate asymmetric key pair. Currently supported algorithms
 * are RSA, DSA, and FEE.
 */
CSSM_RETURN cdsaGenerateKeyPair(
	CSSM_CSP_HANDLE 	cspHandle,
	CSSM_ALGORITHMS		keyAlg,			// e.g., CSSM_ALGID_RSA
	uint32				keySizeInBits,
	CSSM_KEY_PTR		publicKey,
	CSSM_KEY_PTR		privateKey);

/*
 * Free resources allocated in cdsaDeriveKey and cdsaGenerateKeyPair().
 */
CSSM_RETURN cdsaFreeKey(
	CSSM_CSP_HANDLE		cspHandle,		// from cdsaCspAttach()
	CSSM_KEY_PTR		key);			// from cdsaDeriveKey() 

#pragma mark ------ Diffie-Hellman key generation and derivation ------

/*
 * Generate a Diffie-Hellman key pair. Algorithm parameters are
 * either specified by caller via inParams, or are generated here
 * and returned to caller in outParams. Exactly one of (inParams,
 * outParams) must be non-NULL.
 */
CSSM_RETURN cdsaDhGenerateKeyPair(
	CSSM_CSP_HANDLE	cspHandle,
	CSSM_KEY_PTR	publicKey,
	CSSM_KEY_PTR	privateKey,
	uint32			keySizeInBits,
	const CSSM_DATA	*inParams,			// optional 
	CSSM_DATA_PTR	outParams);			// optional, we malloc

/*
 * Perform Diffie-Hellman key exchange. 
 * Given "our" private key (in the form of a CSSM_KEY) and "their" public
 * key (in the form of a raw blob of bytes), cook up a symmetric key.
 */
CSSM_RETURN cdsaDhKeyExchange(
	CSSM_CSP_HANDLE	cspHandle,
	CSSM_KEY_PTR	myPrivateKey,		// from cdsaDhGenerateKeyPair
	const void		*theirPubKey,
	uint32			theirPubKeyLen,
	CSSM_KEY_PTR	derivedKey,			// RETURNED
	uint32			deriveKeySizeInBits,
	CSSM_ALGORITHMS	derivedKeyAlg);		// e.g., CSSM_ALGID_AES

#pragma mark ------ Simple encrypt/decrypt routines ------

/* 
 * These routines are used to perform simple "one-shot"
 * encryption and decryption oprtations. Use them when 
 * all of the data to be encrypted or decrypted is 
 * available at once.
 */
 
/*
 * Encrypt.
 * cipherText->Data is allocated by the CSP and must be freed (via
 * free()) by caller.
 */
CSSM_RETURN cdsaEncrypt(
	CSSM_CSP_HANDLE		cspHandle,		// from cdsaCspAttach()
	const CSSM_KEY		*key,			// from cdsaDeriveKey()
	const CSSM_DATA		*plainText,
	CSSM_DATA_PTR		cipherText);
	
/*
 * Decrypt.
 * plainText->Data is allocated by the CSP and must be freed (via
 * free()) by caller.
 */
CSSM_RETURN cdsaDecrypt(
	CSSM_CSP_HANDLE		cspHandle,		// from cdsaCspAttach()
	const CSSM_KEY		*key,			// from cdsaDeriveKey()
	const CSSM_DATA		*cipherText,
	CSSM_DATA_PTR		plainText);
	
#pragma mark ------ Staged encrypt/decrypt routines ------

/* 
 * These routines are used to perform staged encryption and 
 * decryption operations. A typical use for these routines
 * would be to encrypt or decrypt data coming from a
 * stream or a file.
 *
 * To use these functions, first call cdsaStagedEncDecrInit
 * to set up a CSSM_CC_HANDLE. Then call cdsaStagedEncrypt
 * or cdsaStagedDecrypt as many times as you wish, setting the
 * 'final' aergument to CSSM_TRUE only for the last call.
 * Caller does not need to be concerned about buffer or block 
 * boundaries.
 */

typedef enum {
	/* for use in cdsaStagedEncDecrInit() */
	SO_Encrypt,
	SO_Decrypt,
	/* for use in cdsaStagedSignVerifyInit() */
	SO_Sign,
	SO_Verify
} StagedOpType;

CSSM_RETURN cdsaStagedEncDecrInit(
	CSSM_CSP_HANDLE		cspHandle,		// from cdsaCspAttach()
	const CSSM_KEY		*key,			// from cdsaDeriveKey()
	StagedOpType		opType,			// SO_Encrypt, SO_Decrypt
	CSSM_CC_HANDLE		*ccHandle);		// RETURNED
	
/*
 * Encrypt.
 * -- cipherText->Data is allocated by the CSP and must be freed (via
 *    free()) by caller.
 * -- plainText and its referent (plainText->Data) are optional on
 *    the final call; either one can be NULL at that time. 
 */
CSSM_RETURN cdsaStagedEncrypt(
	CSSM_CC_HANDLE		ccHandle,		// from cdsaStagedEncDecrInit()
	CSSM_BOOL			final,			// CSSM_TRUE on last call 
	const CSSM_DATA		*plainText,
	CSSM_DATA_PTR		cipherText);
	
/*
 * Decrypt.
 * -- plainText->Data is allocated by the CSP and must be freed (via
 *    free()) by caller.
 * -- cipherText and its referent (cipherText->Data) are optional on
 *    the final call; either one can be NULL at that time. 
 */
CSSM_RETURN cdsaStagedDecrypt(
	CSSM_CC_HANDLE		ccHandle,		// from cdsaStagedEncDecrInit()
	CSSM_BOOL			final,			// CSSM_TRUE on last call 
	const CSSM_DATA		*cipherText,
	CSSM_DATA_PTR		plainText);

#pragma mark ------ Digest routines ------

/*
 * The simple one-shot digest routine, when all of the data to 
 * be processed is available at once.
 * digest->Data is allocated by the CSP and must be freed (via
 * free()) by caller.
 */
CSSM_RETURN cdsaDigest(
	CSSM_CSP_HANDLE		cspHandle,		// from cdsaCspAttach()
	CSSM_ALGORITHMS		digestAlg,		// e.g., CSSM_ALGID_SHA1
	const CSSM_DATA		*inData,
	CSSM_DATA_PTR		digestData);
	
/*
 * Staged digest routines. For processing multiple chunks of 
 * data into one digest.
 * This is called once....
 */
CSSM_RETURN cdsaStagedDigestInit(
	CSSM_CSP_HANDLE		cspHandle,		// from cdsaCspAttach()
	CSSM_ALGORITHMS		digestAlg,		// e.g., CSSM_ALGID_SHA1
	CSSM_CC_HANDLE		*ccHandle);		// RETURNED
	
/*
 * And this is called an arbitrary number of times, with a value
 * of CSSM_TRUE for the 'final' argument on the last call.
 * -- Until the final call, the digestData argument is ignored.
 * -- digest->Data is allocated by the CSP and must be freed (via
 *    free()) by caller.
 * -- inData and its referent (inData->Data) are optional on
 *    the final call; either one can be NULL at that time.
 */
CSSM_RETURN cdsaStagedDigest(
	CSSM_CC_HANDLE		ccHandle,		// from cdsaStagedEncDecrInit()
	CSSM_BOOL			final,			// CSSM_TRUE on last call 
	const CSSM_DATA		*inData,
	CSSM_DATA_PTR		digestData);

#pragma mark ------ Simple sign/verify ------

/*
 * Generate a digital signature, one-shot version. To be
 * used when all of the data to be signed is available at once.
 * signature->Data is allocated by the CSP and must be freed (via
 * free()) by caller.
 */
CSSM_RETURN cdsaSign(
	CSSM_CSP_HANDLE		cspHandle,		// from cdsaCspAttach()
	const CSSM_KEY		*key,			// from cdsaGenerateKeyPair()
	CSSM_ALGORITHMS		sigAlg,			// e.g., CSSM_ALGID_SHA1WithRSA
	const CSSM_DATA		*dataToSign,
	CSSM_DATA_PTR		signature);
	
/*
 * Verify a digital signature, one-shot version. To be
 * used when all of the data to be verified is available at once.
 */
CSSM_RETURN cdsaVerify(
	CSSM_CSP_HANDLE		cspHandle,		// from cdsaCspAttach()
	const CSSM_KEY		*key,			// from cdsaGenerateKeyPair()
	CSSM_ALGORITHMS		sigAlg,			// e.g., CSSM_ALGID_SHA1WithRSA
	const CSSM_DATA		*dataToSign,
	const CSSM_DATA		*signature);
	
	
#pragma mark ------ Staged Sign/Verify routines ------

/* 
 * These routines are used to initialize staged sign and 
 * verify oprtations. A typical use for these routines
 * would be to generate or verify a digitial signature for
 * data coming from a stream or a file.
 *
 * To use these functions, first call cdsaStagedSignVerifyInit
 * to set up a CSSM_CC_HANDLE. Then call cdsaStagedSign
 * or cdsaStagedVerify as many times as you wish, passing a 
 * non-NULL 'signature' argument only for the last call.
 * Caller does not need to be concerned about buffer or block 
 * boundaries.
 */

CSSM_RETURN cdsaStagedSignVerifyInit(
	CSSM_CSP_HANDLE		cspHandle,		// from cdsaCspAttach()
	const CSSM_KEY		*key,			// from cdsaDeriveKey()
	CSSM_ALGORITHMS		sigAlg,			// e.g., CSSM_ALGID_SHA1WithRSA
	StagedOpType		opType,			// SO_Sign, SO_Verify
	CSSM_CC_HANDLE		*ccHandle);		// RETURNED
	
/*
 * Sign.
 * -- The signature argument is non-NULL only on the final call to
 *    this function. 
 * -- signature->Data is allocated by the CSP and must be freed (via
 *    free()) by caller.
 * -- dataToSign and its referent (dataToSign->Data) are optional on
 *    the final call; either one can be NULL at that time. 
 */
CSSM_RETURN cdsaStagedSign(
	CSSM_CC_HANDLE		ccHandle,		// from cdsaStagedSignVerifyInit()
	const CSSM_DATA		*dataToSign,
	CSSM_DATA_PTR		signature);		// non-NULL on final call only
	
/*
 * Verify.
 * -- The signature argument is non-NULL only on the final call to
 *    this function. 
 * -- dataToVerify and its referent (dataToVerify->Data) are optional on
 *    the final call; either one can be NULL at that time. 
 */
CSSM_RETURN cdsaStagedVerify(
	CSSM_CC_HANDLE		ccHandle,		// from cdsaStagedSignVerifyInit()
	const CSSM_DATA		*dataToVerify,
	const CSSM_DATA		*signature);	// non-NULL on final call only


#ifdef	__cplusplus
}
#endif

#endif	/* _LIB_CDSA_CRYPT_H_ */
