SHA1Gen

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

class SHA1Gen1 {
    public static final String SHA1 = "SHA-1";
    /**
     * Encode data in base64 string 
     * @param data data in bytes
     * @return a string in base64 format
     */
    public static String base64Encode(byte[] data) {
        Base64.Encoder encoder = Base64.getEncoder();
        return encoder.encodeToString(data);
    }
    /**
     * Generate SHA1 hash from a text
     * @param data the text data to be hashed
     * @return a string in base64 encoded format
     * @throws java.security.NoSuchAlgorithmException
     */
    public static String generateSHA1Hash(String data) throws NoSuchAlgorithmException {
        MessageDigest messageDigest = MessageDigest.getInstance(SHA1);
        messageDigest.update(data.getBytes());
        byte [] hash = messageDigest.digest();
        messageDigest.reset();
        return base64Encode(hash);
    }
}