from nx_crypto_ec.c:310
static NX_CRYPTO_CONST HN_UBASE _nx_crypto_ec_secp521r1_b[] =
{
HN_ULONG_TO_UBASE(0x6B503F00), HN_ULONG_TO_UBASE(0xEF451FD4),
HN_ULONG_TO_UBASE(0x3D2C34F1), HN_ULONG_TO_UBASE(0x3573DF88),
HN_ULONG_TO_UBASE(0x3BB1BF07), HN_ULONG_TO_UBASE(0x1652C0BD),
HN_ULONG_TO_UBASE(0xEC7E937B), HN_ULONG_TO_UBASE(0x56193951),
HN_ULONG_TO_UBASE(0x8EF109E1), HN_ULONG_TO_UBASE(0xB8B48991),
HN_ULONG_TO_UBASE(0x99B315F3), HN_ULONG_TO_UBASE(0xA2DA725B),
HN_ULONG_TO_UBASE(0xB68540EE), HN_ULONG_TO_UBASE(0x929A21A0),
HN_ULONG_TO_UBASE(0x8E1C9A1F), HN_ULONG_TO_UBASE(0x953EB961),
HN_ULONG_TO_UBASE(0x00000051)
};