pidCrypt JavaScript crypto library:
Example:
<script type="text/javascript" src="js/pidcrypt.js"></script>
<script type="text/javascript" src="js/pidcrypt_util.js"></script>
<script type="text/javascript" src="js/asn1.js"></script>
<script type="text/javascript" src="js/jsbn.js"></script>
<script type="text/javascript" src="js/rng.js"></script>
<script type="text/javascript" src="js/prng4.js"></script>
<script type="text/javascript" src="js/rsa.js"></script>
<script type="text/javascript">
/*-----------------------------------------------------------*
* ENCRYPT: RSA 1024 bit *
*-----------------------------------------------------------*/
// public key
var params = certParser(public_key_1024);
var key = pidCryptUtil.decodeBase64(params.b64);
// new RSA instance
var rsa = new pidCrypt.RSA();
/* RSA encryption
* get the modulus and exponent from certificate (ASN1 parsing)
* pem(Array of Bytes)
*/
// ASN1 parsing
var asn = pidCrypt.ASN1.decode(pidCryptUtil.toByteArray(key));
var tree = asn.toHexTree();
// setting the public key for encryption with retrieved ASN.1 tree
rsa.setPublicKeyFromASN(tree);
/*** encrypt */
var crypted = rsa.encrypt("plaintext");
vat fromHex = pidCryptUtil.encodeBase64(pidCryptUtil.convertFromHex(crypted));
var ciphertext = pidCryptUtil.fragment(fromHex,64)
/*-----------------------------------------------------------*
* DECRYPT: RSA 1024 bit *
*-----------------------------------------------------------*/
// private key
params = certParser(private_key_1024);
var key = pidCryptUtil.decodeBase64(params.b64);
// new RSA instance
var rsa = new pidCrypt.RSA();
/* RSA decryption
* get the parameters from certificate (ASN1 parsing)
* pem(Array of Bytes)
*/
// ASN1 parsing
asn = pidCrypt.ASN1.decode(pidCryptUtil.toByteArray(key));
tree = asn.toHexTree();
// setting the private key for decryption with retrieved ASN.1 tree
rsa.setPrivateKeyFromASN(tree);
/*** decrypt */
ciphertext = pidCryptUtil.decodeBase64(pidCryptUtil.stripLineFeeds(ciphertext));
var plaintext = rsa.decrypt(pidCryptUtil.convertToHex(ciphertext));
</script>
