ws-security-dom/src/main/java/org/apache/wss4j/dom/str/EncryptedKeySTRParser.java [189:201]:
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    private REFERENCE_TYPE getReferenceType(SecurityTokenReference secRef) {
        if (secRef.containsReference()) {
            return REFERENCE_TYPE.DIRECT_REF;
        } else if (secRef.containsKeyIdentifier()) {
            if (SecurityTokenReference.THUMB_URI.equals(secRef.getKeyIdentifierValueType())) {
                return REFERENCE_TYPE.THUMBPRINT_SHA1;
            } else {
                return REFERENCE_TYPE.KEY_IDENTIFIER;
            }
        }

        return null;
    }
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ws-security-dom/src/main/java/org/apache/wss4j/dom/str/SignatureSTRParser.java [444:456]:
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    private REFERENCE_TYPE getReferenceType(SecurityTokenReference secRef) {
        if (secRef.containsReference()) {
            return REFERENCE_TYPE.DIRECT_REF;
        } else if (secRef.containsKeyIdentifier()) {
            if (SecurityTokenReference.THUMB_URI.equals(secRef.getKeyIdentifierValueType())) {
                return REFERENCE_TYPE.THUMBPRINT_SHA1;
            } else {
                return REFERENCE_TYPE.KEY_IDENTIFIER;
            }
        }

        return null;
    }
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