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artem-smotrakov/SafeMACValidationExample.java

Created August 15, 2021 14:22
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Using constant-time algorithm for validating a MAC
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SafeMACValidationExample.java
public boolean validate(HttpRequest request, SecretKey key) throws Exception {
byte[] message = getMessageFrom(request);
byte[] signature = getSignatureFrom(request);
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(new SecretKeySpec(key.getEncoded(), "HmacSHA256"));
byte[] actual = mac.doFinal(message);
return MessageDigest.isEqual(signature, actual);
}
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