aes

I found a lot of implementations of AES, Twofish and Serpent in C. But I don't really understand the examples. I only understand that some where provided with examples to invert a matrix. Can someone point me to an example or .c file for to encrypt/decrypt data represented by a char* and a password? The wikipedia article actually links to an excellent tutorial (by X-N20 ) written in C that walks you through the Maths and provides C implementations on the go, which is quite useful for understanding the process. I'd also recommend reading up on finite field arithmetic . Serpent and Twofish ,

I am working in AES256 to be able to encrypt/decrypt between iOS and PHP using insecure channels. I have seen many similar questions that move around the key size, the mode (CBC or ECB), the use of a random iv, etc. But in this case, I found a weird behaviour as follows. Configuration in both environments: - Key: 32 bytes(256 bits) - Block size: 128 bits (standard) - iv: 16 bytes (static for testing purposes) - Mode: CBC If I encrypt a 16 or 32 bytes text (to match the AES block size), the result in Swift, and PHP are similar but not quite the same: key = "12345678901234567890123456789012"

I have a simple class to try and wrap encryption for use elsewhere in my program. import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.spec.SecretKeySpec; public final class StupidSimpleEncrypter { public static String encrypt(String key, String plaintext) { byte[] keyBytes = key.getBytes(); byte[] plaintextBytes = plaintext.getBytes(); byte[] ciphertextBytes = encrypt(keyBytes, plaintextBytes); return new String(ciphertextBytes); } public static byte[] encrypt(byte[] key, byte[] plaintext) { try { Cipher cipher = Cipher

SecureRandom random = new SecureRandom(); // quite heavy, look into a lighter method. String stringToEncrypt = "mypassword"; byte[] realiv = new byte[16]; random.nextBytes(realiv); Cipher ecipher = Cipher.getInstance("AES"); SecureRandom random = new SecureRandom(); // quite heavy, look into a lighter method. byte[] realiv = new byte[16]; random.nextBytes(realiv); byte[] secret = "somelongsecretkey".getBytes(); SecretKeySpec secretKey = new SecretKeySpec(secret, "AES"); ecipher.init(Cipher.ENCRYPT_MODE, secretKey, random); byte[] encryptedData = ecipher.doFinal(); but the init() only takes in

I want to create random AES Encryption key (128 bit) in ios. I have searched in SO but I cannot find a good answer. Please give me some advice. thanks in advance. UPDATE: I have used BBAES lib. I used the below code to generate the encryption key but when I convert from NSData to NSString, it shows NULL -(NSData*)randomDataWithLength{ NSData* salt = [BBAES randomDataWithLength:BBAESSaltDefaultLength]; NSData *key = [BBAES keyBySaltingPassword:@"password" salt:salt keySize:BBAESKeySize128 numberOfIterations:BBAESPBKDF2DefaultIterationsCount]; NSLog(@"Data ASE Key %@",key); NSString *aString = [

I am trying to encrypt data in java and decrypt data in ruby. I found almost same asks, but my case is little bit different. Encrypt in Ruby and Decrypt in Java - Why is it not working? AES/CBC encrypt in Java, decrypt in Ruby My code is ... Encrypt in java import java.util.HashMap; import java.util.Map; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import net.sf.json.JSONObject; import org.apache.commons.codec.binary.Hex; class Crypt { public static void main(String[] args) throws Exception { Map

Here are my encryption settings: public static String encryptionAlgorithm = "AES"; public static short encryptionBitCount = 256; public static int encryptionMessageLength = 176; public static String hashingAlgorithm = "PBEWITHSHAAND128BITAES-CBC-BC"; //PBEWithSHA256And256BitAES-CBC-BC"PBEWithMD5AndDES";//"PBKDF2WithHmacSHA1"; public static short hashingCount = 512; public static String cipherTransformation = "AES/CBC/PKCS5Padding"; Here is my code to decrypt: public byte[] readMessage () throws Exception { byte[] iv = new byte[16]; byte[] message = new byte[EncryptionSettings