Example usage for java.security.interfaces DSAPublicKey getY

Introduction

In this page you can find the example usage for java.security.interfaces DSAPublicKey getY.

Prototype

public BigInteger getY();

Source Link

Document

Returns the value of the public key, y .

Usage

From source file:org.cesecore.keys.util.KeyTools.java

/**
 * Gets the key length of supported keys
 * //from w  w  w . j  ava  2 s.co m
 * @param pk
 *            PublicKey used to derive the keysize
 * @return -1 if key is unsupported, otherwise a number >= 0. 0 usually means the length can not be calculated, for example if the key is an EC
 *         key and the "implicitlyCA" encoding is used.
 */
public static int getKeyLength(final PublicKey pk) {
    int len = -1;
    if (pk instanceof RSAPublicKey) {
        final RSAPublicKey rsapub = (RSAPublicKey) pk;
        len = rsapub.getModulus().bitLength();
    } else if (pk instanceof JCEECPublicKey) {
        final JCEECPublicKey ecpriv = (JCEECPublicKey) pk;
        final org.bouncycastle.jce.spec.ECParameterSpec spec = ecpriv.getParameters();
        if (spec != null) {
            len = spec.getN().bitLength();
        } else {
            // We support the key, but we don't know the key length
            len = 0;
        }
    } else if (pk instanceof BCECPublicKey) {
        final BCECPublicKey ecpriv = (BCECPublicKey) pk;
        final org.bouncycastle.jce.spec.ECParameterSpec spec = ecpriv.getParameters();
        if (spec != null) {
            len = spec.getN().bitLength();
        } else {
            // We support the key, but we don't know the key length
            len = 0;
        }
    } else if (pk instanceof ECPublicKey) {
        final ECPublicKey ecpriv = (ECPublicKey) pk;
        final java.security.spec.ECParameterSpec spec = ecpriv.getParams();
        if (spec != null) {
            len = spec.getOrder().bitLength(); // does this really return something we expect?
        } else {
            // We support the key, but we don't know the key length
            len = 0;
        }
    } else if (pk instanceof DSAPublicKey) {
        final DSAPublicKey dsapub = (DSAPublicKey) pk;
        if (dsapub.getParams() != null) {
            len = dsapub.getParams().getP().bitLength();
        } else {
            len = dsapub.getY().bitLength();
        }
    }
    return len;
}

---

From source file:org.cesecore.keys.util.KeyTools.java

/**
 * Print parameters of public part of a key.
 * /*from  ww w  . j  a  v a  2 s  .  co m*/
 * @param publK
 *            the key
 * @param ps
 *            stream to print to.
 */
public static void printPublicKeyInfo(final PublicKey publK, final PrintStream ps) {
    if (publK instanceof RSAPublicKey) {
        ps.println("RSA key:");
        final RSAPublicKey rsa = (RSAPublicKey) publK;
        ps.println("  modulus: " + rsa.getModulus().toString(16));
        ps.println("  public exponent: " + rsa.getPublicExponent().toString(16));
        return;
    }
    if (publK instanceof ECPublicKey) {
        ps.println("Elliptic curve key:");
        final ECPublicKey ec = (ECPublicKey) publK;
        ps.println("  the affine x-coordinate: " + ec.getW().getAffineX().toString(16));
        ps.println("  the affine y-coordinate: " + ec.getW().getAffineY().toString(16));
        return;
    }
    if (publK instanceof DHPublicKey) {
        ps.println("DH key:");
        final DHPublicKey dh = (DHPublicKey) publK;
        ps.println("  the public value y: " + dh.getY().toString(16));
        return;
    }
    if (publK instanceof DSAPublicKey) {
        ps.println("DSA key:");
        final DSAPublicKey dsa = (DSAPublicKey) publK;
        ps.println("  the public value y: " + dsa.getY().toString(16));
        return;
    }
}

---

From source file:org.ejbca.util.keystore.KeyTools.java

/**
 * Gets the key length of supported keys
 * @param pk PublicKey used to derive the keysize
 * @return -1 if key is unsupported, otherwise a number >= 0. 0 usually means the length can not be calculated, 
 * for example if the key is an EC key and the "implicitlyCA" encoding is used.
 *///from   w  w  w  .j  av a2  s .c  om
public static int getKeyLength(final PublicKey pk) {
    int len = -1;
    if (pk instanceof RSAPublicKey) {
        final RSAPublicKey rsapub = (RSAPublicKey) pk;
        len = rsapub.getModulus().bitLength();
    } else if (pk instanceof JCEECPublicKey) {
        final JCEECPublicKey ecpriv = (JCEECPublicKey) pk;
        final org.bouncycastle.jce.spec.ECParameterSpec spec = ecpriv.getParameters();
        if (spec != null) {
            len = spec.getN().bitLength();
        } else {
            // We support the key, but we don't know the key length
            len = 0;
        }
    } else if (pk instanceof ECPublicKey) {
        final ECPublicKey ecpriv = (ECPublicKey) pk;
        final java.security.spec.ECParameterSpec spec = ecpriv.getParams();
        if (spec != null) {
            len = spec.getOrder().bitLength(); // does this really return something we expect?
        } else {
            // We support the key, but we don't know the key length
            len = 0;
        }
    } else if (pk instanceof DSAPublicKey) {
        final DSAPublicKey dsapub = (DSAPublicKey) pk;
        if (dsapub.getParams() != null) {
            len = dsapub.getParams().getP().bitLength();
        } else {
            len = dsapub.getY().bitLength();
        }
    }
    return len;
}

---

• «
• 1
• 2
• »