static MessageDigest createDigestInstance(String digestAlgOID, Provider provider)
throws NoSuchAlgorithmException {
String digestName = TSPUtil.getDigestAlgName(digestAlgOID);
if (provider != null) {
try {
return MessageDigest.getInstance(digestName, provider);
} catch (NoSuchAlgorithmException e) {
// Ignore
}
}
return MessageDigest.getInstance(digestName);
}
static int getDigestLength(String digestAlgOID, String provider)
throws NoSuchProviderException, TSPException {
String digestName = TSPUtil.getDigestAlgName(digestAlgOID);
try {
Integer length = (Integer) digestLengths.get(digestAlgOID);
if (length != null) {
return length.intValue();
}
return MessageDigest.getInstance(digestName, provider).getDigestLength();
} catch (NoSuchAlgorithmException e) {
try {
return MessageDigest.getInstance(digestName).getDigestLength();
} catch (NoSuchAlgorithmException ex) {
throw new TSPException("digest algorithm cannot be found.", ex);
}
}
}
