Initial code commit

src/sega/a7/PrikeyExponentWrite.java

@@ -0,0 +1,50 @@
+package sega.a7;
+
+import javacard.security.MessageDigest;
+
+/**
+ * Replaces the RSA private exponent. Both the modulus and the exponent must be
+ * written before the new key becomes active; the update is staged in RAM.
+ */
+public class PrikeyExponentWrite extends AuthCommand {
+
+    public PrikeyExponentWrite(short cmd, AppData data, MakePacket packet,
+                               MessageDigest sha1, HmacSha1 hmacSha1, Crypt crypt) {
+        super(cmd, (short) 302, (short) 46, AppConfig.LEVEL_AUTH,
+                data, packet, sha1, hmacSha1, crypt);
+    }
+
+    public short core(byte[] data, short dataOffset, short dataLength) {
+        if (m_ee_data.getSflag_ee()) {
+            return AppConfig.EEPWRITE_DISABLE;
+        }
+
+        byte[] buffer = m_ee_data.getGeneralBuffer_ramD();
+        if (buffer.length < AppConfig.RSA_KEY_SIZE) {
+            return AppConfig.FAIL;
+        }
+
+        short decSize = decData(data,
+                (short) (dataOffset + AppConfig.HEADER_SIZE),
+                AppConfig.RSA_KEY_SIZE, buffer, (short) 0);
+        if (decSize < AppConfig.RSA_KEY_SIZE) {
+            return AppConfig.FAIL;
+        }
+
+        if (!m_ee_data.setRsaPriKeyExponent_ee(buffer, (short) 0,
+                AppConfig.RSA_KEY_SIZE)) {
+            return AppConfig.EEP_WRITEFAIL;
+        }
+        m_ee_data.activeRsaExponentUpdate_ramD();
+
+        if (m_ee_data.getRsaModulusUpdate_ramD()) {
+            byte[] modulus = m_ee_data.getRsaPriModulus_ee();
+            byte[] exponent = m_ee_data.getRsaPriExponent_ee();
+            if (!changeRsaKey_ee(modulus, (short) 0, (short) modulus.length,
+                    exponent, (short) 0, (short) exponent.length)) {
+                return AppConfig.FAIL;
+            }
+        }
+        return AppConfig.SUCCESS;
+    }
+}