glenndarwis/iOS-Certificate--Key--and-Trust-Sample-Project

This project derives content heavily from iOS Certificate, Key, and Trust Programming guide. It's primary purpose is to give the user the ability to quickly import/export RSA private keys from the keychain to the console.

Purpose

This open source repo is designed to provide a convenient wrapper for the inbuilt iOS RSA cryptographic functionality.

Supported OS & SDK Versions

• Supported build target - iOS 6.0 / Mac OS 10.8 (Xcode 4.5, Apple LLVM compiler 4.1)

ARC Compatibility

This project is written according to ARC conventions.

Installation

Copy the crypto library into your project or workspace. You must link the Security.framework to any targets that will be using this library. Also add the -ObjC and -all_load linker flags to dependent targets.

Examples

Examples for usage can be found in ViewController.m.

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [self generateKeysExample];
    [self importKeysExample];
}


- (void)generateKeysExample
{
    BDError *error = [[BDError alloc] init];
    BDRSACryptor *RSACryptor = [[BDRSACryptor alloc] init];
    
    BDRSACryptorKeyPair *RSAKeyPair = [RSACryptor generateKeyPairWithKeyIdentifier:@"key_pair_tag"
                                                                             error:error];
    
    BDDebugLog(@"Private Key:\n%@\n\nPublic Key:\n%@", RSAKeyPair.privateKey, RSAKeyPair.publicKey);
    
    [self encryptionCycleWithRSACryptor:RSACryptor
                                keyPair:RSAKeyPair
                                  error:error];
}


- (void)importKeysExample
{
    BDError *error = [[BDError alloc] init];
    BDRSACryptor *RSACryptor = [[BDRSACryptor alloc] init];
    
    NSString *privateKey = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"rsa_private_key" ofType:@"txt"]
                                                     encoding:NSUTF8StringEncoding
                                                        error:nil];
    
    NSString *publicKey = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"rsa_public_key" ofType:@"txt"]
                                                    encoding:NSUTF8StringEncoding
                                                       error:nil];
    
    BDRSACryptorKeyPair *RSAKeyPair = [[BDRSACryptorKeyPair alloc] initWithPublicKey:publicKey
                                                                          privateKey:privateKey];
    
    [self encryptionCycleWithRSACryptor:RSACryptor
                                keyPair:RSAKeyPair
                                  error:error];
}


- (void)encryptionCycleWithRSACryptor:(BDRSACryptor *)RSACryptor
                              keyPair:(BDRSACryptorKeyPair *)RSAKeyPair
                                error:(BDError *)error
{
    NSString *cipherText =
    [RSACryptor encrypt:@"Plain Text"
                    key:RSAKeyPair.publicKey
                  error:error];
    
    BDDebugLog(@"Cipher Text:\n%@", cipherText);
    
    NSString *recoveredText =
    [RSACryptor decrypt:cipherText
                    key:RSAKeyPair.privateKey
                  error:error];
    
    BDDebugLog(@"Recovered Text:\n%@", recoveredText);
}