package com.braintreegateway.util;
import com.braintreegateway.org.apache.commons.codec.binary.Hex;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;
public class Crypto {
public String hmacHash(String privateKey, String content) {
String hash = "";
try {
SecretKeySpec signingKey = new SecretKeySpec(sha1Bytes(privateKey), "SHA1");
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(signingKey);
byte[] rawMac = mac.doFinal(content.getBytes("UTF-8"));
byte[] hexBytes = new Hex().encode(rawMac);
hash = new String(hexBytes, "ISO-8859-1");
} catch (Exception e) {
throw new RuntimeException(e);
}
return hash;
}
public Boolean secureCompare(String left, String right) {
if (left == null || right == null || (left.length() != right.length())) {
return false;
}
byte[] leftBytes = left.getBytes();
byte[] rightBytes = right.getBytes();
int result = 0;
for (int i = 0; i < left.length(); i++) {
result = result | leftBytes[i] ^ rightBytes[i];
}
return result == 0;
}
public byte[] sha1Bytes(String string) {
try {
MessageDigest md = MessageDigest.getInstance("SHA1");
md.update(string.getBytes("UTF-8"));
return md.digest();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}