/*

 File: SecKeyWrapper.h

 Abstract: Core cryptographic wrapper class to exercise most of the Security 

 APIs on the iPhone OS. Start here if all you are interested in are the 

 cryptographic APIs on the iPhone OS.

 Version: 1.2

 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Inc.

 ("Apple") in consideration of your agreement to the following terms, and your

 use, installation, modification or redistribution of this Apple software

 constitutes acceptance of these terms.  If you do not agree with these terms,

 please do not use, install, modify or redistribute this Apple software.

 In consideration of your agreement to abide by the following terms, and subject

 to these terms, Apple grants you a personal, non-exclusive license, under

 Apple's copyrights in this original Apple software (the "Apple Software"), to

 use, reproduce, modify and redistribute the Apple Software, with or without

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 this notice and the following text and disclaimers in all such redistributions

 of the Apple Software.

 Neither the name, trademarks, service marks or logos of Apple Inc. may be used

 to endorse or promote products derived from the Apple Software without specific

 prior written permission from Apple.  Except as expressly stated in this notice,

 no other rights or licenses, express or implied, are granted by Apple herein,

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 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

 WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

 WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

 COMBINATION WITH YOUR PRODUCTS.

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 Copyright (C) 2008-2009 Apple Inc. All Rights Reserved.

 */

#import <UIKit/UIKit.h>

#import <Security/Security.h>

#import <CommonCrypto/CommonDigest.h>

#import <CommonCrypto/CommonCryptor.h>

/* Begin global declarations */

// Global constants used for symmetric key algorithm choice and

// chosen digest.

// The chosen symmetric key and digest algorithm chosen for this sample is AES and SHA1.

// The reasoning behind this was due to the fact that the iPhone and iPod touch have

// hardware accelerators for those particular algorithms and therefore are energy efficient.

#define kChosenCipherBlockSize  kCCBlockSizeAES128

#define kChosenCipherKeySize    kCCKeySizeAES128

#define kChosenDigestLength     CC_SHA1_DIGEST_LENGTH

// Global constants for padding schemes.

#define kPKCS1                  11

#define kTypeOfWrapPadding      kSecPaddingPKCS1

#define kTypeOfSigPadding       kSecPaddingPKCS1SHA1

// constants used to find public, private, and symmetric keys.

#define kPublicKeyTag           "com.apple.sample.publickey"

#define kPrivateKeyTag          "com.apple.sample.privatekey"

#define kSymmetricKeyTag        "com.apple.sample.symmetrickey"

@interface SecKeyWrapper : NSObject {

    NSData * publicTag;

    NSData * privateTag;

    NSData * symmetricTag;

    CCOptions typeOfSymmetricOpts;

    SecKeyRef publicKeyRef;

    SecKeyRef privateKeyRef;

    NSData * symmetricKeyRef;

}

@property (nonatomic, retain) NSData * publicTag;

@property (nonatomic, retain) NSData * privateTag;

@property (nonatomic, retain) NSData * symmetricTag;

@property (nonatomic, retain) NSData * symmetricKeyRef;

+ (SecKeyWrapper *)sharedWrapper;

- (void)generateKeyPair:(NSUInteger)keySize;

- (void)deleteAsymmetricKeys;

- (void)deleteSymmetricKey;

- (void)generateSymmetricKey;

- (SecKeyRef)addPeerPublicKey:(NSString *)peerName keyBits:(NSData *)publicKey;

- (void)removePeerPublicKey:(NSString *)peerName;

- (NSData *)getSymmetricKeyBytes;

- (NSData *)wrapSymmetricKey:(NSData *)symmetricKey keyRef:(SecKeyRef)publicKey;

- (NSData *)unwrapSymmetricKey:(NSData *)wrappedSymmetricKey;

- (NSData *)getSignatureBytes:(NSData *)plainText;

- (NSData *)getHashBytes:(NSData *)plainText;

- (BOOL)verifySignature:(NSData *)plainText secKeyRef:(SecKeyRef)publicKey signature:(NSData *)sig;

- (NSData *)doCipher:(NSData *)plainText key:(NSData *)symmetricKey context:(CCOperation)encryptOrDecrypt padding:(CCOptions *)pkcs7;

- (SecKeyRef)getPublicKeyRef;

- (NSData *)getPublicKeyBits;

- (SecKeyRef)getPrivateKeyRef;

- (CFTypeRef)getPersistentKeyRefWithKeyRef:(SecKeyRef)keyRef;

- (SecKeyRef)getKeyRefWithPersistentKeyRef:(CFTypeRef)persistentRef;

@end