private void signatureVerify()

in main/src/main/java/org/apache/james/jdkim/DKIMVerifier.java [502:524]

• 21 lines of code
• 4 McCabe index (conditional complexity)

    private void signatureVerify(Headers h, SignatureRecord sign,
                                 byte[] decoded, PublicKeyRecord key, List<CharSequence> headers)
            throws PermFailException {
        try {
            Signature signature = Signature.getInstance(sign.getHashMethod()
                    .toString().toUpperCase()
                    + "with" + sign.getHashKeyType().toString().toUpperCase());
            PublicKey publicKey;
            try {
                publicKey = key.getPublicKey();
            } catch (IllegalStateException e) {
                throw new PermFailException("Invalid Public Key: " + e.getMessage(), sign, e);
            }
            signature.initVerify(publicKey);

            signatureCheck(h, sign, headers, signature);

            if (!signature.verify(decoded))
                throw new PermFailException("Header signature does not verify", sign);
        } catch (InvalidKeyException | NoSuchAlgorithmException | SignatureException e) {
            throw new PermFailException(e.getMessage(), sign, e);
        }
    }