package org.springframework.security.crypto.password;
import java.security.MessageDigest;
import org.springframework.security.crypto.codec.Hex;
import org.springframework.security.crypto.keygen.BytesKeyGenerator;
import org.springframework.security.crypto.keygen.KeyGenerators;
import org.springframework.security.crypto.util.EncodingUtils;
public abstract class AbstractPasswordEncoder implements PasswordEncoder {
private final BytesKeyGenerator saltGenerator;
protected AbstractPasswordEncoder() {
this.saltGenerator = KeyGenerators.secureRandom();
}
@Override
public String encode(CharSequence rawPassword) {
byte[] salt = this.saltGenerator.generateKey();
byte[] encoded = encodeAndConcatenate(rawPassword, salt);
return String.valueOf(Hex.encode(encoded));
}
@Override
public boolean matches(CharSequence rawPassword, String encodedPassword) {
byte[] digested = Hex.decode(encodedPassword);
byte[] salt = EncodingUtils.subArray(digested, 0, this.saltGenerator.getKeyLength());
return matches(digested, encodeAndConcatenate(rawPassword, salt));
}
protected abstract byte[] encode(CharSequence rawPassword, byte[] salt);
protected byte[] encodeAndConcatenate(CharSequence rawPassword, byte[] salt) {
return EncodingUtils.concatenate(salt, encode(rawPassword, salt));
}
protected static boolean matches(byte[] expected, byte[] actual) {
return MessageDigest.isEqual(expected, actual);
}
}