sshd-common/src/main/java/org/apache/sshd/common/signature/BuiltinSignatures.java [314:322]:
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    public static void registerExtension(SignatureFactory extension) {
        String name = Objects.requireNonNull(extension, "No extension provided").getName();
        ValidateUtils.checkTrue(fromFactoryName(name) == null, "Extension overrides built-in: %s", name);

        synchronized (EXTENSIONS) {
            ValidateUtils.checkTrue(!EXTENSIONS.containsKey(name), "Extension overrides existing: %s", name);
            EXTENSIONS.put(name, extension);
        }
    }
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sshd-common/src/main/java/org/apache/sshd/common/cipher/BuiltinCiphers.java [219:227]:
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    public static void registerExtension(CipherFactory extension) {
        String name = Objects.requireNonNull(extension, "No extension provided").getName();
        ValidateUtils.checkTrue(fromFactoryName(name) == null, "Extension overrides built-in: %s", name);

        synchronized (EXTENSIONS) {
            ValidateUtils.checkTrue(!EXTENSIONS.containsKey(name), "Extension overrides existing: %s", name);
            EXTENSIONS.put(name, extension);
        }
    }
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sshd-common/src/main/java/org/apache/sshd/common/compression/BuiltinCompressions.java [116:124]:
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    public static void registerExtension(CompressionFactory extension) {
        String name = Objects.requireNonNull(extension, "No extension provided").getName();
        ValidateUtils.checkTrue(fromFactoryName(name) == null, "Extension overrides built-in: %s", name);

        synchronized (EXTENSIONS) {
            ValidateUtils.checkTrue(!EXTENSIONS.containsKey(name), "Extension overrides existing: %s", name);
            EXTENSIONS.put(name, extension);
        }
    }
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sshd-core/src/main/java/org/apache/sshd/common/kex/BuiltinDHFactories.java [328:336]:
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    public static void registerExtension(DHFactory extension) {
        String name = Objects.requireNonNull(extension, "No extension provided").getName();
        ValidateUtils.checkTrue(fromFactoryName(name) == null, "Extension overrides built-in: %s", name);

        synchronized (EXTENSIONS) {
            ValidateUtils.checkTrue(!EXTENSIONS.containsKey(name), "Extension overrides existing: %s", name);
            EXTENSIONS.put(name, extension);
        }
    }
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