VPCCMCrypt
AES/CCM library in Objective-C with Streaming Support
Features
- AES/128 - ECB Mode
- Stream Encryption/Decryption methods which allows you to upload each chunk of data to server
- Data to Data Encryption/Decryption methods
- File to File Encryption/Decryption methods
- It uses only 16kb of memory (for stream operations)
#Installation
Add these lines to your Podfile
platform :ios, '6.0'
pod 'VPCCMCrypt', '~> 0.0.1'Initialization
NSData *key = ...
NSData *iv = ...
NSData *adata = ...
NSInteger tagLength = ...
VPCCMCrypt *ccm = [[VPCCMCrypt alloc] initWithKey:key
iv:iv
adata:adata
tagLength:tagLength];How to use
Data to Data Encryption
NSData *plainData = ...
[ccm encryptDataWithData:plainData
finishedBlock:^(NSData *data) {
//Do something with data
} errorBlock:^(NSError *error) {
NSLog(@"Encryption Error: %@", error);
}];
Data to Data Decryption:
NSData *encryptedData = ...
[ccm decryptDataWithData:encryptedData
finishedBlock:^(NSData *data) {
//Do something with data
} errorBlock:^(NSError *error) {
NSLog(@"Decryption Error: %@", error);
}];File to File Encryption
NSURL *sourceURL = ...
NSURL *destinationURL = ...
[ccm encryptFileToFileWithSourceURL:sourceURL
destUrl:destinationURL
finishedBlock:^{
//Encryption finished
} errorBlock:^(NSError *error) {
NSLog(@"Encryption Error: %@", error);
}];File to File Decryption:
NSURL *sourceURL = ...
NSURL *destinationURL = ...
[ccm decryptFileToFileWithSourceURL:sourceURL
destUrl:destinationURL
finishedBlock:^{
//Decryption finished
} errorBlock:^(NSError *error) {
NSLog(@"Encryption Error: %@", error);
}];Stream Encryption
NSURL *fileUrl = ...
[ccm encryptStreamWithUrl:fileUrl
dataBlock:^(NSData *data, BOOL isLastBlock) {
if (isLastBlock) {
//data = TAG
}
//Upload data to server
} errorBlock:^(NSError *error) {
NSLog(@"Encryption Error: %@", error);
}];Stream Decryption
NSURL *fileUrl = ...
[ccm decryptStreamWithUrl:fileUrl
dataBlock:^(NSData *data, BOOL isLastBlock) {
//Do something with the decrypted data
} errorBlock:^(NSError *error) {
NSLog(@"Decryption Error: %@", error);
}];Contributors
Special thanks to Thanos Chatziathanasiou (tchatzi@arx.net) for his implementation in Perl