diff --git a/include/polarssl/ecp.h b/include/polarssl/ecp.h
index a616e16..d9e6ed6 100644
--- a/include/polarssl/ecp.h
+++ b/include/polarssl/ecp.h
@@ -55,7 +55,6 @@
     mpi B;              /*!<  constant term in the equation     */
     ecp_point G;        /*!<  generator of the subgroup used    */
     mpi N;              /*!<  the order of G                    */
-    unsigned char h;    /*!<  the cofactor of the subgroup      */
 }
 ecp_group;
 
@@ -64,11 +63,81 @@
  *
  * These also are the NIST-recommended ECP groups, are the random ECP groups
  * recommended by SECG, and include the two groups used by NSA Suite B.
+ * There are known as secpLLLr1 with LLL = 192, 224, 256, 384, 521.
  *
  * \warning This library does not support validation of arbitrary domain
  * parameters. Therefore, only well-known domain parameters from trusted
  * sources (such as the ones below) should be used.
  */
+#define POLARSSL_ECP_SECP192R1_P \
+    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF"
+#define POLARSSL_ECP_SECP192R1_B \
+    "64210519E59C80E70FA7E9AB72243049FEB8DEECC146B9B1"
+#define POLARSSL_ECP_SECP192R1_GX \
+    "188DA80EB03090F67CBF20EB43A18800F4FF0AFD82FF1012"
+#define POLARSSL_ECP_SECP192R1_GY \
+    "07192B95FFC8DA78631011ED6B24CDD573F977A11E794811"
+#define POLARSSL_ECP_SECP192R1_N \
+    "FFFFFFFFFFFFFFFFFFFFFFFF99DEF836146BC9B1B4D22831"
+
+#define POLARSSL_ECP_SECP224R1_P \
+    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF000000000000000000000001"
+#define POLARSSL_ECP_SECP224R1_B \
+    "B4050A850C04B3ABF54132565044B0B7D7BFD8BA270B39432355FFB4"
+#define POLARSSL_ECP_SECP224R1_GX \
+    "B70E0CBD6BB4BF7F321390B94A03C1D356C21122343280D6115C1D21"
+#define POLARSSL_ECP_SECP224R1_GY \
+    "BD376388B5F723FB4C22DFE6CD4375A05A07476444D5819985007E34"
+#define POLARSSL_ECP_SECP224R1_N \
+    "FFFFFFFFFFFFFFFFFFFFFFFFFFFF16A2E0B8F03E13DD29455C5C2A3D"
+
+#define POLARSSL_ECP_SECP256R1_P \
+    "FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF"
+#define POLARSSL_ECP_SECP256R1_B \
+    "5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B"
+#define POLARSSL_ECP_SECP256R1_GX \
+    "6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296"
+#define POLARSSL_ECP_SECP256R1_GY \
+    "4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5"
+#define POLARSSL_ECP_SECP256R1_N \
+    "FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551"
+
+#define POLARSSL_ECP_SECP384R1_P \
+    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF" \
+    "FFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFF"
+#define POLARSSL_ECP_SECP384R1_B \
+    "B3312FA7E23EE7E4988E056BE3F82D19181D9C6EFE814112" \
+    "0314088F5013875AC656398D8A2ED19D2A85C8EDD3EC2AEF"
+#define POLARSSL_ECP_SECP384R1_GX \
+    "AA87CA22BE8B05378EB1C71EF320AD746E1D3B628BA79B98" \
+    "59F741E082542A385502F25DBF55296C3A545E3872760AB7"
+#define POLARSSL_ECP_SECP384R1_GY \
+    "3617DE4A96262C6F5D9E98BF9292DC29F8F41DBD289A147C" \
+    "E9DA3113B5F0B8C00A60B1CE1D7E819D7A431D7C90EA0E5F"
+#define POLARSSL_ECP_SECP384R1_N \
+    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF" \
+    "C7634D81F4372DDF581A0DB248B0A77AECEC196ACCC52973"
+
+#define POLARSSL_ECP_SECP521R1_P \
+    "000001FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF" \
+    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF" \
+    "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
+#define POLARSSL_ECP_SECP521R1_B \
+    "00000051953EB9618E1C9A1F929A21A0B68540EEA2DA725B" \
+    "99B315F3B8B489918EF109E156193951EC7E937B1652C0BD" \
+    "3BB1BF073573DF883D2C34F1EF451FD46B503F00"
+#define POLARSSL_ECP_SECP521R1_GX \
+    "000000C6858E06B70404E9CD9E3ECB662395B4429C648139" \
+    "053FB521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127" \
+    "A2FFA8DE3348B3C1856A429BF97E7E31C2E5BD66"
+#define POLARSSL_ECP_SECP521R1_GY \
+    "0000011839296A789A3BC0045C8A5FB42C7D1BD998F54449" \
+    "579B446817AFBD17273E662C97EE72995EF42640C550B901" \
+    "3FAD0761353C7086A272C24088BE94769FD16650"
+#define POLARSSL_ECP_SECP521R1_N \
+    "000001FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF" \
+    "FFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148" \
+    "F709A5D03BB5C9B8899C47AEBB6FB71E91386409"
 
 #ifdef __cplusplus
 extern "C" {