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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.crypto.tls;

/**
 * RFC 4492 5.4
 */
public class ECCurveType
{
    /**
     * Indicates the elliptic curve domain parameters are conveyed verbosely, and the
     * underlying finite field is a prime field.
     */
    public static final short explicit_prime = 1;

    /**
     * Indicates the elliptic curve domain parameters are conveyed verbosely, and the
     * underlying finite field is a characteristic-2 field.
     */
    public static final short explicit_char2 = 2;

    /**
     * Indicates that a named curve is used. This option SHOULD be used when applicable.
     */
    public static final short named_curve = 3;

    /*
     * Values 248 through 255 are reserved for private use.
     */
}