src/main/java/org/apache/jcp/xml/dsig/internal/dom/DOMHMACSignatureMethod.java [162:182]:
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            throw new NullPointerException();
        }
        if (!(key instanceof SecretKey)) {
            throw new InvalidKeyException("key must be SecretKey");
        }
        if (hmac == null) {
            try {
                Provider p = (Provider)context.getProperty(DOM_SIGNATURE_PROVIDER);
                hmac = (p == null)
                    ? Mac.getInstance(getJCAAlgorithm())
                    : Mac.getInstance(getJCAAlgorithm(), p);
            } catch (NoSuchAlgorithmException nsae) {
                throw new XMLSignatureException(nsae);
            }
        }
        if (outputLengthSet && outputLength < getDigestLength()) {
            throw new XMLSignatureException
                ("HMACOutputLength must not be less than " + getDigestLength());
        }
        hmac.init(key);
        ((DOMSignedInfo)si).canonicalize(context, new MacOutputStream(hmac));
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src/main/java/org/apache/jcp/xml/dsig/internal/dom/DOMHMACSignatureMethod.java [193:213]:
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            throw new NullPointerException();
        }
        if (!(key instanceof SecretKey)) {
            throw new InvalidKeyException("key must be SecretKey");
        }
        if (hmac == null) {
            try {
                Provider p = (Provider)context.getProperty(DOM_SIGNATURE_PROVIDER);
                hmac = (p == null)
                    ? Mac.getInstance(getJCAAlgorithm())
                    : Mac.getInstance(getJCAAlgorithm(), p);
            } catch (NoSuchAlgorithmException nsae) {
                throw new XMLSignatureException(nsae);
            }
        }
        if (outputLengthSet && outputLength < getDigestLength()) {
            throw new XMLSignatureException
                ("HMACOutputLength must not be less than " + getDigestLength());
        }
        hmac.init(key);
        ((DOMSignedInfo)si).canonicalize(context, new MacOutputStream(hmac));
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