1 files changed, 177 insertions, 0 deletions
diff --git a/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/rsa/BCRSAPublicKey.java b/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/rsa/BCRSAPublicKey.java
new file mode 100644
index 00000000..7a4454c5
--- /dev/null
+++ b/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/rsa/BCRSAPublicKey.java
@@ -0,0 +1,177 @@
+package org.spongycastle.jcajce.provider.asymmetric.rsa;
+
+import java.io.EOFException;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.OptionalDataException;
+import java.math.BigInteger;
+import java.security.interfaces.RSAPublicKey;
+import java.security.spec.RSAPublicKeySpec;
+
+import org.spongycastle.asn1.DERNull;
+import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
+import org.spongycastle.crypto.params.RSAKeyParameters;
+import org.spongycastle.jcajce.provider.asymmetric.util.KeyUtil;
+
+public class BCRSAPublicKey
+    implements RSAPublicKey
+{
+    private static final AlgorithmIdentifier DEFAULT_ALGORITHM_IDENTIFIER = new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE);
+
+    static final long serialVersionUID = 2675817738516720772L;
+
+    private BigInteger modulus;
+    private BigInteger publicExponent;
+    private transient AlgorithmIdentifier algorithmIdentifier;
+
+    BCRSAPublicKey(
+        RSAKeyParameters key)
+    {
+        this.algorithmIdentifier = DEFAULT_ALGORITHM_IDENTIFIER;
+        this.modulus = key.getModulus();
+        this.publicExponent = key.getExponent();
+    }
+
+    BCRSAPublicKey(
+        RSAPublicKeySpec spec)
+    {
+        this.algorithmIdentifier = DEFAULT_ALGORITHM_IDENTIFIER;
+        this.modulus = spec.getModulus();
+        this.publicExponent = spec.getPublicExponent();
+    }
+
+    BCRSAPublicKey(
+        RSAPublicKey key)
+    {
+        this.algorithmIdentifier = DEFAULT_ALGORITHM_IDENTIFIER;
+        this.modulus = key.getModulus();
+        this.publicExponent = key.getPublicExponent();
+    }
+
+    BCRSAPublicKey(
+        SubjectPublicKeyInfo info)
+    {
+        populateFromPublicKeyInfo(info);
+    }
+
+    private void populateFromPublicKeyInfo(SubjectPublicKeyInfo info)
+    {
+        try
+        {
+            org.spongycastle.asn1.pkcs.RSAPublicKey  pubKey = org.spongycastle.asn1.pkcs.RSAPublicKey.getInstance(info.parsePublicKey());
+
+            this.algorithmIdentifier = info.getAlgorithm();
+            this.modulus = pubKey.getModulus();
+            this.publicExponent = pubKey.getPublicExponent();
+        }
+        catch (IOException e)
+        {
+            throw new IllegalArgumentException("invalid info structure in RSA public key");
+        }
+    }
+
+    /**
+     * return the modulus.
+     *
+     * @return the modulus.
+     */
+    public BigInteger getModulus()
+    {
+        return modulus;
+    }
+
+    /**
+     * return the public exponent.
+     *
+     * @return the public exponent.
+     */
+    public BigInteger getPublicExponent()
+    {
+        return publicExponent;
+    }
+
+    public String getAlgorithm()
+    {
+        return "RSA";
+    }
+
+    public String getFormat()
+    {
+        return "X.509";
+    }
+
+    public byte[] getEncoded()
+    {
+        return KeyUtil.getEncodedSubjectPublicKeyInfo(algorithmIdentifier, new org.spongycastle.asn1.pkcs.RSAPublicKey(getModulus(), getPublicExponent()));
+    }
+
+    public int hashCode()
+    {
+        return this.getModulus().hashCode() ^ this.getPublicExponent().hashCode();
+    }
+
+    public boolean equals(Object o)
+    {
+        if (o == this)
+        {
+            return true;
+        }
+
+        if (!(o instanceof RSAPublicKey))
+        {
+            return false;
+        }
+
+        RSAPublicKey key = (RSAPublicKey)o;
+
+        return getModulus().equals(key.getModulus())
+            && getPublicExponent().equals(key.getPublicExponent());
+    }
+
+    public String toString()
+    {
+        StringBuffer    buf = new StringBuffer();
+        String          nl = System.getProperty("line.separator");
+
+        buf.append("RSA Public Key").append(nl);
+        buf.append("            modulus: ").append(this.getModulus().toString(16)).append(nl);
+        buf.append("    public exponent: ").append(this.getPublicExponent().toString(16)).append(nl);
+
+        return buf.toString();
+    }
+
+    private void readObject(
+        ObjectInputStream in)
+        throws IOException, ClassNotFoundException
+    {
+        in.defaultReadObject();
+
+        try
+        {
+            algorithmIdentifier = AlgorithmIdentifier.getInstance(in.readObject());
+        }
+        catch (OptionalDataException e)
+        {
+            algorithmIdentifier = DEFAULT_ALGORITHM_IDENTIFIER;
+        }
+        catch (EOFException e)
+        {
+            algorithmIdentifier = DEFAULT_ALGORITHM_IDENTIFIER;
+        }
+    }
+
+    private void writeObject(
+        ObjectOutputStream out)
+        throws IOException
+    {
+        out.defaultWriteObject();
+
+        if (!algorithmIdentifier.equals(DEFAULT_ALGORITHM_IDENTIFIER))
+        {
+            out.writeObject(algorithmIdentifier.getEncoded());
+        }
+    }
+}