1 files changed, 0 insertions, 164 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/kems/RSAKeyEncapsulation.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/kems/RSAKeyEncapsulation.java
deleted file mode 100755
index 5f9a7f519..000000000
--- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/kems/RSAKeyEncapsulation.java
+++ /dev/null
@@ -1,164 +0,0 @@
-package org.spongycastle.crypto.kems;
-
-import java.math.BigInteger;
-import java.security.SecureRandom;
-
-import org.spongycastle.crypto.CipherParameters;
-import org.spongycastle.crypto.DerivationFunction;
-import org.spongycastle.crypto.KeyEncapsulation;
-import org.spongycastle.crypto.params.KDFParameters;
-import org.spongycastle.crypto.params.KeyParameter;
-import org.spongycastle.crypto.params.RSAKeyParameters;
-import org.spongycastle.util.BigIntegers;
-
-/**
- * The RSA Key Encapsulation Mechanism (RSA-KEM) from ISO 18033-2.
- */
-public class RSAKeyEncapsulation
-    implements KeyEncapsulation
-{
-    private static final BigInteger ZERO = BigInteger.valueOf(0);
-    private static final BigInteger ONE = BigInteger.valueOf(1);
-
-    private DerivationFunction kdf;
-    private SecureRandom rnd;
-    private RSAKeyParameters key;
-
-    /**
-     * Set up the RSA-KEM.
-     *
-     * @param kdf the key derivation function to be used.
-     * @param rnd the random source for the session key.
-     */
-    public RSAKeyEncapsulation(
-        DerivationFunction kdf,
-        SecureRandom rnd)
-    {
-        this.kdf = kdf;
-        this.rnd = rnd;
-    }
-
-
-    /**
-     * Initialise the RSA-KEM.
-     *
-     * @param key the recipient's public (for encryption) or private (for decryption) key.
-     */
-    public void init(CipherParameters key)
-        throws IllegalArgumentException
-    {
-        if (!(key instanceof RSAKeyParameters))
-        {
-            throw new IllegalArgumentException("RSA key required");
-        }
-        else
-        {
-            this.key = (RSAKeyParameters)key;
-        }
-    }
-
-
-    /**
-     * Generate and encapsulate a random session key.
-     *
-     * @param out    the output buffer for the encapsulated key.
-     * @param outOff the offset for the output buffer.
-     * @param keyLen the length of the random session key.
-     * @return the random session key.
-     */
-    public CipherParameters encrypt(byte[] out, int outOff, int keyLen)
-        throws IllegalArgumentException
-    {
-        if (key.isPrivate())
-        {
-            throw new IllegalArgumentException("Public key required for encryption");
-        }
-
-        BigInteger n = key.getModulus();
-        BigInteger e = key.getExponent();
-
-        // Generate the ephemeral random and encode it    
-        BigInteger r = BigIntegers.createRandomInRange(ZERO, n.subtract(ONE), rnd);
-        byte[] R = BigIntegers.asUnsignedByteArray((n.bitLength() + 7) / 8, r);
-
-        // Encrypt the random and encode it     
-        BigInteger c = r.modPow(e, n);
-        byte[] C = BigIntegers.asUnsignedByteArray((n.bitLength() + 7) / 8, c);
-        System.arraycopy(C, 0, out, outOff, C.length);
-
-
-        // Initialise the KDF
-        kdf.init(new KDFParameters(R, null));
-
-        // Generate the secret key
-        byte[] K = new byte[keyLen];
-        kdf.generateBytes(K, 0, K.length);
-
-        return new KeyParameter(K);
-    }
-
-
-    /**
-     * Generate and encapsulate a random session key.
-     *
-     * @param out    the output buffer for the encapsulated key.
-     * @param keyLen the length of the random session key.
-     * @return the random session key.
-     */
-    public CipherParameters encrypt(byte[] out, int keyLen)
-    {
-        return encrypt(out, 0, keyLen);
-    }
-
-
-    /**
-     * Decrypt an encapsulated session key.
-     *
-     * @param in     the input buffer for the encapsulated key.
-     * @param inOff  the offset for the input buffer.
-     * @param inLen  the length of the encapsulated key.
-     * @param keyLen the length of the session key.
-     * @return the session key.
-     */
-    public CipherParameters decrypt(byte[] in, int inOff, int inLen, int keyLen)
-        throws IllegalArgumentException
-    {
-        if (!key.isPrivate())
-        {
-            throw new IllegalArgumentException("Private key required for decryption");
-        }
-
-        BigInteger n = key.getModulus();
-        BigInteger d = key.getExponent();
-
-        // Decode the input
-        byte[] C = new byte[inLen];
-        System.arraycopy(in, inOff, C, 0, C.length);
-        BigInteger c = new BigInteger(1, C);
-
-        // Decrypt the ephemeral random and encode it
-        BigInteger r = c.modPow(d, n);
-        byte[] R = BigIntegers.asUnsignedByteArray((n.bitLength() + 7) / 8, r);
-
-        // Initialise the KDF
-        kdf.init(new KDFParameters(R, null));
-
-        // Generate the secret key
-        byte[] K = new byte[keyLen];
-        kdf.generateBytes(K, 0, K.length);
-
-        return new KeyParameter(K);
-    }
-
-    /**
-     * Decrypt an encapsulated session key.
-     *
-     * @param in     the input buffer for the encapsulated key.
-     * @param keyLen the length of the session key.
-     * @return the session key.
-     */
-    public CipherParameters decrypt(byte[] in, int keyLen)
-    {
-        return decrypt(in, 0, in.length, keyLen);
-    }
-}