lkdocs

require 'openssl' 
	def sign_data(key, data)
	key.sign(OpenSSL::Digest::SHA256.new, data)
end

lkdocs

require 'openssl' 
def verify_sign(key, signature, data)
	# Verifies with a public key that the data was signed with their private key 
	pubkey = key.public_key 
	if pubkey.verify(OpenSSL::Digest::SHA256.new, signature, data)
		puts 'the signature is valid'
	else
		puts 'the signature is invalid'
	end
end

lkdocs

require 'openssl' 
def generate_RSA(bits=2048)
	# Generates an RSA keypair 
	# @bits The key length in bits 
	OpenSSL::PKey::RSA.new(bits)
end

lkdocs

<?
public function rsa_encrypt($key, $message) {
	$rsa = new Crypt_RSA(); 
	$rsa->loadKey($key); 
	$encrypted = base64_encode($rsa->encrypt($message)); 
	return $encrypted;
}
?>

lkdocs

<?
public function rsa_decrypt($key, $package) {
	$rsa = new Crypt_RSA(); 
	$rsa->loadKey($key); 
	$decrypted = $rsa->decrypt(base64_decode($package)); 
	return $decrypted;
}
?>

lkdocs

<?
public function rsa_decrypt($key, $package) {
	$rsa = new Crypt_RSA(); 
	$rsa->setHash("sha256"); 
	$rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1); 
	$rsa->loadKey($key); 
	$signature = base64_encode($rsa->sign(base64_decode($package))); 
	return $signature;
}
?>

lkdocs

<?
public function rsa_verify_sign($key, $signature, $package) {
	$rsa = new Crypt_RSA(); 
	$rsa->setHash("sha256"); 
	$rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1); 
	$rsa->loadKey($key); 
	$verify = $rsa->verify(base64_decode($package), $signature); 
	return $verify;
}
?>

lkdocs

<?
public function rsa_generate($bits=2048) {
	$rsa = new Crypt_RSA(); 
	define('CRYPT_RSA_EXPONENT', 65537); 
	$keypair = $rsa->createKey($bits); 
	return $keypair;
}
?>

lkdocs

private byte[] encryptWithPublicKey(byte[] message, String publicKey) throws Exception {
	String strippedKey = Crypto.stripPublicKeyHeaders(publicKey); 
	PublicKey apiPublicKey= Crypto.getRSAPublicKeyFromString(strippedKey); 
	Cipher rsaCipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA1AndMGF1Padding", "SC");
	rsaCipher.init(Cipher.ENCRYPT_MODE, apiPublicKey); 
	return rsaCipher.doFinal(message);
}

lkdocs

public static byte[] decryptWithPrivateKey(byte[] message, String privateKey) throws Exception {
	PrivateKey pKey = getRSAPrivateKeyFromString(privateKey); 
	Cipher rsaCipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA1AndMGF1Padding", "SC");
	rsaCipher.init(Cipher.DECRYPT_MODE, pKey); 
	return rsaCipher.doFinal(message);
}