How to decrypt AES-256 CBC?
There is a given code ( Java) that encrypts a certain text:
public String encrypt(String plainText, String password) throws Exception
{
MessageDigest digest = MessageDigest.getInstance("SHA-256");
digest.update(password.getBytes("UTF-8"));
byte[] keyBytes = new byte[32];
System.arraycopy(digest.digest(), 0, keyBytes, 0, keyBytes.length);
cipher = Cipher.getInstance("AES/CBC/ZeroBytePadding");
key = new SecretKeySpec(keyBytes, "AES");
spec = getIV();
cipher.init(Cipher.ENCRYPT_MODE, key, spec);
byte[] encrypted = cipher.doFinal(plainText.getBytes("UTF-8"));
String encryptedText = new String(Base64.encode(encrypted, Base64.DEFAULT), "UTF-8");
return encryptedText;
}
public AlgorithmParameterSpec getIV() //get iv
{
byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };
IvParameterSpec ivParameterSpec;
ivParameterSpec = new IvParameterSpec(iv);
return ivParameterSpec;
}
How can I decrypt the received text on the server using php?
0
Author: nexus2014su, 2018-05-13
1 answers
To decrypt the text, you need to perform the reverse operations: decode from base64, get an array of bytes, decode the array using a password and an initialization vector (example of lib https://github.com/lt/PHP-AES), and convert the decoded array to a string.
2
Author: Vadim Bondaruk, 2018-05-13 13:57:24