diff --git a/keygen/keygen.c b/keygen/keygen.c
index fd854eeb..229dee0b 100755
--- a/keygen/keygen.c
+++ b/keygen/keygen.c
@@ -82,6 +82,74 @@ static char g_ppk_d[108] =
   0x00, 0x00, 0x00, 0x00
 };
 
+static char g_test_e[4] =
+{
+  0x01, 0x00, 0x01, 0x00
+};
+
+static char g_test_n[64] =
+{
+  0x67, 0xab, 0x0e, 0x6a, 0x9f, 0xd6, 0x2b, 0xa3,
+  0x32, 0x2f, 0x41, 0xd1, 0xce, 0xee, 0x61, 0xc3,
+  0x76, 0x0b, 0x26, 0x11, 0x70, 0x48, 0x8a, 0x8d,
+  0x23, 0x81, 0x95, 0xa0, 0x39, 0xf7, 0x5b, 0xaa,
+  0x3e, 0xf1, 0xed, 0xb8, 0xc4, 0xee, 0xce, 0x5f,
+  0x6a, 0xf5, 0x43, 0xce, 0x5f, 0x60, 0xca, 0x6c,
+  0x06, 0x75, 0xae, 0xc0, 0xd6, 0xa4, 0x0c, 0x92,
+  0xa4, 0xc6, 0x75, 0xea, 0x64, 0xb2, 0x50, 0x5b
+};
+
+static char g_test_sign[64] =
+{
+  0x6a, 0x41, 0xb1, 0x43, 0xcf, 0x47, 0x6f, 0xf1,
+  0xe6, 0xcc, 0xa1, 0x72, 0x97, 0xd9, 0xe1, 0x85,
+  0x15, 0xb3, 0xc2, 0x39, 0xa0, 0xa6, 0x26, 0x1a,
+  0xb6, 0x49, 0x01, 0xfa, 0xa6, 0xda, 0x60, 0xd7,
+  0x45, 0xf7, 0x2c, 0xee, 0xe4, 0x8e, 0x64, 0x2e,
+  0x37, 0x49, 0xf0, 0x4c, 0x94, 0x6f, 0x08, 0xf5,
+  0x63, 0x4c, 0x56, 0x29, 0x55, 0x5a, 0x63, 0x41,
+  0x2c, 0x20, 0x65, 0x95, 0x99, 0xb1, 0x15, 0x7c
+};
+
+static char g_test_d[64] =
+{
+  0x41, 0x93, 0x05, 0xB1, 0xF4, 0x38, 0xFC, 0x47,
+  0x88, 0xC4, 0x7F, 0x83, 0x8C, 0xEC, 0x90, 0xDA,
+  0x0C, 0x8A, 0xB5, 0xAE, 0x61, 0x32, 0x72, 0xF5,
+  0x2B, 0xD1, 0x7B, 0x5F, 0x44, 0xC0, 0x7C, 0xBD,
+  0x8A, 0x35, 0xFA, 0xAE, 0x30, 0xF6, 0xC4, 0x6B,
+  0x55, 0xA7, 0x65, 0xEF, 0xF4, 0xB2, 0xAB, 0x18,
+  0x4E, 0xAA, 0xE6, 0xDC, 0x71, 0x17, 0x3B, 0x4C,
+  0xC2, 0x15, 0x4C, 0xF7, 0x81, 0xBB, 0xF0, 0x03
+};
+
+static char g_testa[22 * 8] =
+{
+  0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x06, 0x00, 0x5c, 0x00,
+  0x52, 0x53, 0x41, 0x31, 0x48, 0x00, 0x00, 0x00,
+  0x00, 0x02, 0x00, 0x00, 0x3f, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0x01, 0x00, 0x79, 0x6f, 0xb4, 0xdf,
+  0xa6, 0x95, 0xb9, 0xa9, 0x61, 0xe3, 0xc4, 0x5e,
+  0xff, 0x6b, 0xd8, 0x81, 0x8a, 0x12, 0x4a, 0x93,
+  0x42, 0x97, 0x18, 0x93, 0xac, 0xd1, 0x3a, 0x38,
+  0x3c, 0x68, 0x50, 0x19, 0x31, 0xb6, 0x84, 0x51,
+  0x79, 0xfb, 0x1c, 0xe7, 0xe3, 0x99, 0x20, 0xc7,
+  0x84, 0xdf, 0xd1, 0xaa, 0xb5, 0x15, 0xef, 0x47,
+  0x7e, 0xfc, 0x88, 0xeb, 0x29, 0xc3, 0x27, 0x5a,
+  0x35, 0xf8, 0xfd, 0xaa, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+                          0x08, 0x00, 0x48, 0x00,
+  0x32, 0x3b, 0xde, 0x6f, 0x18, 0x97, 0x1e, 0xc3,
+  0x6b, 0x2b, 0x2d, 0xe4, 0xfc, 0x2d, 0xa2, 0x8e,
+  0x32, 0x3c, 0xf3, 0x1b, 0x24, 0x90, 0x57, 0x4d,
+  0x8e, 0xe4, 0x69, 0xfc, 0x16, 0x8d, 0x41, 0x92,
+  0x78, 0xc7, 0x9c, 0xb4, 0x26, 0xff, 0xe8, 0x3e,
+  0xa1, 0x8a, 0xf5, 0x57, 0xc0, 0x7f, 0x3e, 0x21,
+  0x17, 0x32, 0x30, 0x6f, 0x79, 0xe1, 0x36, 0xcd,
+  0xb6, 0x8e, 0xbe, 0x57, 0x57, 0xd2, 0xa9, 0x36
+};
+
 /*****************************************************************************/
 static void
 reverse(char* p, int len)
@@ -311,6 +379,93 @@ key_gen(void)
   return error;
 }
 
+/*****************************************************************************/
+int APP_CC
+ssl_mod_exp(char* out, int out_len, char* in, int in_len,
+            char* mod, int mod_len, char* exp, int exp_len)
+{
+  BN_CTX* ctx;
+  BIGNUM lmod;
+  BIGNUM lexp;
+  BIGNUM lin;
+  BIGNUM lout;
+  int rv;
+  char* l_out;
+  char* l_in;
+  char* l_mod;
+  char* l_exp;
+
+  l_out = (char*)g_malloc(out_len, 1);
+  l_in = (char*)g_malloc(in_len, 1);
+  l_mod = (char*)g_malloc(mod_len, 1);
+  l_exp = (char*)g_malloc(exp_len, 1);
+  g_memcpy(l_in, in, in_len);
+  g_memcpy(l_mod, mod, mod_len);
+  g_memcpy(l_exp, exp, exp_len);
+  reverse(l_in, in_len);
+  reverse(l_mod, mod_len);
+  reverse(l_exp, exp_len);
+  ctx = BN_CTX_new();
+  BN_init(&lmod);
+  BN_init(&lexp);
+  BN_init(&lin);
+  BN_init(&lout);
+  BN_bin2bn((unsigned char*)l_mod, mod_len, &lmod);
+  BN_bin2bn((unsigned char*)l_exp, exp_len, &lexp);
+  BN_bin2bn((unsigned char*)l_in, in_len, &lin);
+  BN_mod_exp(&lout, &lin, &lexp, &lmod, ctx);
+  rv = BN_bn2bin(&lout, (unsigned char*)l_out);
+  if (rv <= out_len)
+  {
+    reverse(l_out, rv);
+    g_memcpy(out, l_out, out_len);
+  }
+  else
+  {
+    rv = 0;
+  }
+  BN_free(&lin);
+  BN_free(&lout);
+  BN_free(&lexp);
+  BN_free(&lmod);
+  BN_CTX_free(ctx);
+  g_free(l_out);
+  g_free(l_in);
+  g_free(l_mod);
+  g_free(l_exp);
+  return rv;
+}
+
+/*****************************************************************************/
+static int APP_CC
+key_test(void)
+{
+  char md5_final[16];
+  char sig[64];
+  unsigned char* p;
+  MD5_CTX md5;
+
+  g_writeln("original key is:");
+  g_hexdump(g_testa, 176);
+  g_writeln("original exponent is:");
+  g_hexdump(g_testa + 32, 4);
+  g_writeln("original modulus is:");
+  g_hexdump(g_testa + 36, 64);
+  g_writeln("original signature is:");
+  g_hexdump(g_testa + 112, 64);
+  MD5_Init(&md5);
+  p = (unsigned char*)g_testa;
+  MD5_Update(&md5, p, 108);
+  p = (unsigned char*)md5_final;
+  MD5_Final(p, &md5);
+  g_writeln("md5 hash of first 108 bytes of this key is:");
+  g_hexdump(md5_final, 16);
+  ssl_mod_exp(sig, 64, md5_final, 16, g_ppk_n, 64, g_ppk_d, 64);
+  g_writeln("produced signature(fix this, it should match original signature above) is:");
+  g_hexdump(sig, 64);
+  return 0;
+}
+
 /*****************************************************************************/
 int DEFAULT_CC
 main(int argc, char** argv)
@@ -321,6 +476,10 @@ main(int argc, char** argv)
     {
       return key_gen();
     }
+    else if (g_strcasecmp(argv[1], "test") == 0)
+    {
+      return key_test();
+    }
   }
   out_params();
   return 0;