sshd-common/src/main/java/org/apache/sshd/common/signature/BuiltinSignatures.java [106:129]:
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        private final AtomicReference<Boolean> supportHolder = new AtomicReference<>();

        @Override
        public Signature create() {
            return new SignatureRSASHA512();
        }

        @Override
        public boolean isSupported() {
            Boolean supported = supportHolder.get();
            if (supported == null) {
                try {
                    java.security.Signature sig = SecurityUtils.getSignature(SignatureRSASHA512.ALGORITHM);
                    supported = sig != null;
                } catch (Exception e) {
                    supported = Boolean.FALSE;
                }

                supportHolder.set(supported);
            }

            return supported;
        }
    },
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sshd-common/src/main/java/org/apache/sshd/common/signature/BuiltinSignatures.java [131:154]:
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        private final AtomicReference<Boolean> supportHolder = new AtomicReference<>();

        @Override
        public Signature create() {
            return new SignatureRSASHA512();
        }

        @Override
        public boolean isSupported() {
            Boolean supported = supportHolder.get();
            if (supported == null) {
                try {
                    java.security.Signature sig = SecurityUtils.getSignature(SignatureRSASHA512.ALGORITHM);
                    supported = sig != null;
                } catch (Exception e) {
                    supported = Boolean.FALSE;
                }

                supportHolder.set(supported);
            }

            return supported;
        }
    },
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