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 * Copyright (C) 2026, Leo Galambos
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 *    This product includes software developed by the Egothor project.
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package zeroecho.core.err;

/**
 * Exception indicating that a provided key/spec combination is not supported by
 * the algorithm for the requested role.
 *
 * <p>
 * This is thrown by {@link zeroecho.core.CryptoAlgorithm#create} when:
 * </p>
 * <ul>
 * <li>The algorithm supports the requested {@link zeroecho.core.KeyUsage} role,
 * but none of its bindings accept the given {@link java.security.Key} and
 * {@code ContextSpec} type.</li>
 * <li>The provided {@code spec} is incompatible with the key type or context
 * expected by the binding.</li>
 * </ul>
 *
 * <p>
 * Unlike {@link UnsupportedRoleException}, which signals that a role is
 * completely unavailable for an algorithm, this exception means that the role
 * exists but cannot be realized with the supplied parameters.
 * </p>
 *
 * <h2>Example</h2> <pre>{@code
 * CryptoAlgorithm aes = CryptoAlgorithms.require("AES/GCM");
 * SecretKey wrongKey = ... // an RSA key by mistake
 * try {
 *     aes.create(KeyUsage.ENCRYPT, wrongKey, null);
 * } catch (UnsupportedSpecException e) {
 *     // no binding accepted the RSA key for ENCRYPT role
 * }
 * }</pre>
 *
 * @since 1.0
 */
public class UnsupportedSpecException extends RuntimeException {
    private static final long serialVersionUID = -4569004728562695244L;

    /**
     * Creates a new exception with the given message.
     *
     * @param m detail message describing the rejected key/spec combination
     */
    public UnsupportedSpecException(String m) {
        super(m);
    }
}
