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package org.spongycastle.pqc.crypto.ntru;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.spongycastle.pqc.math.ntru.polynomial.IntegerPolynomial;
/**
* A NtruEncrypt public key is essentially a polynomial named <code>h</code>.
*/
public class NTRUEncryptionPublicKeyParameters
extends NTRUEncryptionKeyParameters
{
public IntegerPolynomial h;
/**
* Constructs a new public key from a polynomial
*
* @param h the polynomial <code>h</code> which determines the key
* @param params the NtruEncrypt parameters to use
*/
public NTRUEncryptionPublicKeyParameters(IntegerPolynomial h, NTRUEncryptionParameters params)
{
super(false, params);
this.h = h;
}
/**
* Converts a byte array to a polynomial <code>h</code> and constructs a new public key
*
* @param b an encoded polynomial
* @param params the NtruEncrypt parameters to use
* @see #getEncoded()
*/
public NTRUEncryptionPublicKeyParameters(byte[] b, NTRUEncryptionParameters params)
{
super(false, params);
h = IntegerPolynomial.fromBinary(b, params.N, params.q);
}
/**
* Reads a polynomial <code>h</code> from an input stream and constructs a new public key
*
* @param is an input stream
* @param params the NtruEncrypt parameters to use
* @see #writeTo(OutputStream)
*/
public NTRUEncryptionPublicKeyParameters(InputStream is, NTRUEncryptionParameters params)
throws IOException
{
super(false, params);
h = IntegerPolynomial.fromBinary(is, params.N, params.q);
}
/**
* Converts the key to a byte array
*
* @return the encoded key
* @see #NTRUEncryptionPublicKeyParameters(byte[], NTRUEncryptionParameters)
*/
public byte[] getEncoded()
{
return h.toBinary(params.q);
}
/**
* Writes the key to an output stream
*
* @param os an output stream
* @throws IOException
* @see #NTRUEncryptionPublicKeyParameters(InputStream, NTRUEncryptionParameters)
*/
public void writeTo(OutputStream os)
throws IOException
{
os.write(getEncoded());
}
public int hashCode()
{
final int prime = 31;
int result = 1;
result = prime * result + ((h == null) ? 0 : h.hashCode());
result = prime * result + ((params == null) ? 0 : params.hashCode());
return result;
}
public boolean equals(Object obj)
{
if (this == obj)
{
return true;
}
if (obj == null)
{
return false;
}
if (!(obj instanceof NTRUEncryptionPublicKeyParameters))
{
return false;
}
NTRUEncryptionPublicKeyParameters other = (NTRUEncryptionPublicKeyParameters)obj;
if (h == null)
{
if (other.h != null)
{
return false;
}
}
else if (!h.equals(other.h))
{
return false;
}
if (params == null)
{
if (other.params != null)
{
return false;
}
}
else if (!params.equals(other.params))
{
return false;
}
return true;
}
}
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