/**
* Returns the ASN.1 encoding of this object.
*
* @return the ASN.1 encoding.
* @exception IOException if error occurs when constructing its ASN.1 encoding.
*/
public byte[] getEncoded() throws NoSuchAlgorithmException, IOException {
if (this.encoded != null) return this.encoded.clone();
DerOutputStream out = new DerOutputStream();
DerOutputStream tmp = new DerOutputStream();
DerOutputStream tmp2 = new DerOutputStream();
// encode encryption algorithm
AlgorithmId algid = AlgorithmId.get(digestAlgorithmName);
algid.encode(tmp2);
// encode digest data
tmp2.putOctetString(digest);
tmp.write(DerValue.tag_Sequence, tmp2);
// encode salt
tmp.putOctetString(macSalt);
// encode iterations
tmp.putInteger(iterations);
// wrap everything into a SEQUENCE
out.write(DerValue.tag_Sequence, tmp);
this.encoded = out.toByteArray();
return this.encoded.clone();
}
private static void writeSignatureBlock(
Signature signature, X509Certificate publicKey, OutputStream out)
throws IOException, GeneralSecurityException {
SignerInfo signerInfo =
new SignerInfo(
new X500Name(publicKey.getIssuerX500Principal().getName()),
publicKey.getSerialNumber(),
AlgorithmId.get("SHA1"),
AlgorithmId.get("RSA"),
signature.sign());
PKCS7 pkcs7 =
new PKCS7(
new AlgorithmId[] {AlgorithmId.get("SHA1")},
new ContentInfo(ContentInfo.DATA_OID, null),
new X509Certificate[] {publicKey},
new SignerInfo[] {signerInfo});
pkcs7.encodeSignedData(out);
}
MacData(String algName, byte[] digest, byte[] salt, int iterations)
throws NoSuchAlgorithmException {
if (algName == null)
throw new NullPointerException("the algName parameter " + "must be non-null");
AlgorithmId algid = AlgorithmId.get(algName);
this.digestAlgorithmName = algid.getName();
this.digestAlgorithmParams = algid.getParameters();
if (digest == null) {
throw new NullPointerException("the digest " + "parameter must be non-null");
} else if (digest.length == 0) {
throw new IllegalArgumentException("the digest " + "parameter must not be empty");
} else {
this.digest = digest.clone();
}
this.macSalt = salt;
this.iterations = iterations;
// delay the generation of ASN.1 encoding until
// getEncoded() is called
this.encoded = null;
}