1 files changed, 53 insertions, 0 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/crypto/parsers/ECIESPublicKeyParser.java b/bcprov/src/main/java/org/bouncycastle/crypto/parsers/ECIESPublicKeyParser.java
new file mode 100644
index 0000000..1880a50
--- /dev/null
+++ b/bcprov/src/main/java/org/bouncycastle/crypto/parsers/ECIESPublicKeyParser.java
@@ -0,0 +1,53 @@
+package org.bouncycastle.crypto.parsers;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.bouncycastle.crypto.KeyParser;
+import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
+import org.bouncycastle.crypto.params.ECDomainParameters;
+import org.bouncycastle.crypto.params.ECPublicKeyParameters;
+
+public class ECIESPublicKeyParser
+    implements KeyParser
+{
+    private ECDomainParameters ecParams;
+
+    public ECIESPublicKeyParser(ECDomainParameters ecParams)
+    {
+        this.ecParams = ecParams;
+    }
+
+    public AsymmetricKeyParameter readKey(InputStream stream)
+        throws IOException
+    {
+        byte[] V;
+        int    first = stream.read();
+
+        // Decode the public ephemeral key
+        switch (first)
+        {
+        case 0x00: // infinity
+            throw new IOException("Sender's public key invalid.");
+
+        case 0x02: // compressed
+        case 0x03: // Byte length calculated as in ECPoint.getEncoded();
+            V = new byte[1 + (ecParams.getCurve().getFieldSize()+7)/8];
+            break;
+
+        case 0x04: // uncompressed or
+        case 0x06: // hybrid
+        case 0x07: // Byte length calculated as in ECPoint.getEncoded();
+            V = new byte[1 + 2*((ecParams.getCurve().getFieldSize()+7)/8)];
+            break;
+
+        default:
+            throw new IOException("Sender's public key has invalid point encoding 0x" + Integer.toString(first, 16));
+        }
+
+        V[0] = (byte)first;
+        stream.read(V, 1, V.length - 1);
+
+        return new ECPublicKeyParameters(ecParams.getCurve().decodePoint(V), ecParams);
+    }
+}