Objective-C CommonCrypto: Generate RSA Keys Example.m

+(void)generateKeyPairWithPublicTag:(NSString *)publicTagString privateTag:(NSString *)privateTagString {
	NSMutableDictionary *privateKeyAttr = [[NSMutableDictionary alloc] init]; 
	NSMutableDictionary *publicKeyAttr = [[NSMutableDictionary alloc] init]; 
	NSMutableDictionary *keyPairAttr = [[NSMutableDictionary alloc] init]; 
	
	NSData *publicTag = [publicTagString dataUsingEncoding:NSUTF8StringEncoding]; 
	NSData *privateTag = [privateTagString dataUsingEncoding:NSUTF8StringEncoding]; 
	
	SecKeyRef publicKey = NULL; 
	SecKeyRef privateKey = NULL; 
	
	[keyPairAttr setObject:(__bridge id)kSecAttrKeyTypeRSA
	forKey:(__bridge id)kSecAttrKeyType];
	[keyPairAttr setObject:[NSNumber numberWithInt:2048]
	forKey:(__bridge id)kSecAttrKeySizeInBits];
	
	[privateKeyAttr setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecAttrIsPermanent]; 
	[privateKeyAttr setObject:privateTag forKey:(__bridge id)kSecAttrApplicationTag]; 
	
	[publicKeyAttr setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecAttrIsPermanent]; 
	[publicKeyAttr setObject:publicTag forKey:(__bridge id)kSecAttrApplicationTag]; 
	
	[keyPairAttr setObject:privateKeyAttr forKey:(__bridge id)kSecPrivateKeyAttrs]; 
	[keyPairAttr setObject:publicKeyAttr forKey:(__bridge id)kSecPublicKeyAttrs]; 
	
	OSStatus err = SecKeyGeneratePair((__bridge CFDictionaryRef)keyPairAttr, &publicKey, &privateKey); 
	
	if(publicKey) CFRelease(publicKey); 
	if(privateKey) CFRelease(privateKey);
}