generate RSA Public Key - Android java.security

Android examples for java.security:RSA

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Description

generate RSA Public Key

Demo Code


import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPrivateCrtKeySpec;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;
import android.util.Base64;

public class Main{
    public static PublicKey getPublicKey() {
        return publicKey;
    }/*  w  w  w  .  ja va2  s.c  om*/
    public static PublicKey getPublicKey(String modulus,
            String publicExponent) throws NoSuchAlgorithmException,
            InvalidKeySpecException {

        BigInteger bigIntModulus = new BigInteger(modulus, 16);

        BigInteger bigIntPublicExponent = new BigInteger(publicExponent, 16);

        RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus,
                bigIntPublicExponent);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(keySpec);
        return publicKey;
    }
}

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