RSA Encryption: Java code to PHP code

Question

I'm trying to implement RSA Encryption in both Java and PHP, but I can't seem to get PHP to output the same Encrypted Result with Java.

Java Code

public static String sign(byte[] data,String privateKey)throws Exception{
    byte[] keyBytes = Base64.decodeBase64(privateKey);
    PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(keyBytes);

    //KEY_ALGORTHM="RSA";
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORTHM);
    PrivateKey privateKey2 = keyFactory.generatePrivate(pkcs8EncodedKeySpec);

    //SIGNATURE_ALGORITHM="SHA1WithRSA"
    Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
    signature.initSign(privateKey2);
    signature.update(data);
    return Base64.encodeBase64String(signature.sign());
}

PHP Code

public function sign( string $data,string $privateKey){
      openssl_private_encrypt($data,$encrypted,$privateKey);
      return base64_encode($encrypted);
}

Can someone help me to translate it to PHP Code ?

Any help would be greatly appreciated o.O

From the openssl_private_encrypt man page have you played around with the $padding arg? It defaults too OPENSSL_PKCS1_PADDING but you may want OPENSSL_PKCS1_OAEP_PADDING instead — IsThisJavascript
– IsThisJavascript, Commented Apr 17, 2018 at 8:22

eric · Accepted Answer · 2018-04-17 08:26:02Z

3

I have solved the problem.

In Java Code,it's SIGNATURE_ALGORITHM is 'SHA1WithRSA'

so,In PHP Code

public function sign( string $data,string $privateKey){
  openssl_sign($data,$sign,$privateKeyString,OPENSSL_ALGO_SHA1);
  return base64_encode($encrypted);
}

answered Apr 17, 2018 at 8:26

eric

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2 Comments

IsThisJavascript Over a year ago

Good stuff please mark this as the answer so the topic can be closed =)

eric Over a year ago

@IsThisJavascript ok，but SO said 2 days later then I can mark my answer as the topic's answer:)

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