RSA

Simplest RSA Wrapper

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Internet has very little to offer for RSA on iOS. Over complicated code, no documentation or using 3rd Part Frameworks when it can be done using native Security framework on iOS

Note: Most methods return Base64 encoded strings.

RSA.h

// Start a instance using +(void)sharedInstance

// Then call this method with 3 unique string as indentifiers
// Identifier in simple words is just names to used to remember these keys in a keychain

- (void)setIdentifierForPublicKey:(NSString *)pubIdentifier
                       privateKey:(NSString *)privIdentifier
                  serverPublicKey:(NSString *)servPublicIdentifier;

// Call this to generate the a pair of public and private keys for the mobile
- (void)generateKeyPairRSACompleteBlock:(GenerateSuccessBlock)_success;

Encryption Methods

- (NSString *)encryptUsingPublicKeyWithData:(NSData *)data;
- (NSString *)encryptUsingPrivateKeyWithData:(NSData*)data;

Decryption Methods

- (NSString *)decryptUsingPublicKeyWithData:(NSData *)data;
- (NSString *)decryptUsingPrivateKeyWithData:(NSData*)data;

SET and GET Public Key

- (BOOL)setPublicKey:(NSString *)keyAsBase64;
- (NSString *)getPublicKeyAsBase64;

Encrypt using Server Public Key

// Use setPublicKey before using this method to set the server public key
- (NSString *)encryptUsingServerPublicKeyWithData:(NSData *)data;

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Have a Java Backened ?

It needs small modification for working with iOS

Great many thanks to Berin for his blog post on getting this working.

SET / GET Public key for Java Servers

- (BOOL)setPublicKeyFromJavaServer:(NSString *)keyAsBase64;
- (NSString *)getPublicKeyAsBase64ForJavaServer;

License

The MIT License (MIT)

Copyright (c) 2012 Reejo Samuel (http://reejosamuel.com/)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.