Encrypt in java and Decrypt in IOS - Not working about cross-platform-aes-encryption

[dschlaba]

If compiling for iOS 7 and above, you no longer need the NSData+Base64 files.

Here is an updated m file that compiles in iOS10

http://pastebin.com/CjAEDsgb

Now to test:

`+ (void)test{

StringEncryption *crypt = [[StringEncryption alloc] init];

NSString *secret = @"This is the text to be encrypted"; // this is the text that you want to encrypt.

NSString *key = [[StringEncryption alloc] sha256:@"my secret key" length:32]; // this is very important, 32 bytes = 256 bit

NSString *iv = [crypt generateRandomIV:16]; // Here we are generating random initialization vector (iv).
                                            // Length of this vector = 16 bytes = 128 bits

// Now that we have input text, hashed key and random IV, we are all set for encryption:
NSData *encryptedData = [crypt encrypt:[secret dataUsingEncoding:NSUTF8StringEncoding] key:key iv:iv];

// Here is your encrypted string to pass.
NSString *encryptedString = [encryptedData base64EncodedStringWithOptions:0];

//--- SOME ACTION ---//
//--- Save to a database, pass to another device, etc. ---//

// Here is how you convert your passed string back into an NSData object.
NSData *encryptedDataSent = [[NSData alloc] initWithBase64EncodedString:encryptedString options:NSDataBase64DecodingIgnoreUnknownCharacters];

// 2. Decryption
//      Decrypt the data and then convert it back into a string.
//      You will have to use the same IV and key which was used for encryption.
NSData *decryptedData = [[StringEncryption alloc] decrypt:encryptedDataSent key:key iv:iv];
NSString *decryptedText = [[NSString alloc] initWithData:decryptedData encoding:NSUTF8StringEncoding];

NSLog(@"iv=%@", iv);
NSLog(@"key=%@", key);
NSLog(@"Plain text=%@", secret);
NSLog(@"encrypted=%@", encryptedString);
NSLog(@"decrypted=%@", decryptedText);

}
`

Remember, the RandomIV has to be the same on both sides so you will need to figure out how to pass it to whatever device is doing the decrypt.