typedef int cl_engine_init(void);
typedef int cl_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
                       const BIGNUM *m, BN_CTX *cgx);
typedef int cl_mod_exp_crt(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
                           const BIGNUM *q, const BIGNUM *dmp1,
                           const BIGNUM *dmq1, const BIGNUM *iqmp,
                           BN_CTX *ctx);
typedef int cl_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa);
typedef int cl_rsa_pub_enc(int flen, const unsigned char *from,
                           unsigned char *to, RSA *rsa, int padding);
typedef int cl_rsa_pub_dec(int flen, const unsigned char *from,
                           unsigned char *to, RSA *rsa, int padding);
typedef int cl_rsa_priv_enc(int flen, const unsigned char *from,
                            unsigned char *to, RSA *rsa, int padding);
typedef int cl_rsa_priv_dec(int flen, const unsigned char *from,
                            unsigned char *to, RSA *rsa, int padding);
typedef int cl_rand_bytes(unsigned char *buf, int num);
typedef DSA_SIG *cl_dsa_sign(const unsigned char *dgst, int dlen, DSA *dsa);
typedef int cl_dsa_verify(const unsigned char *dgst, int dgst_len,
                          DSA_SIG *sig, DSA *dsa);

static const char *CLUSTER_LABS_LIB_NAME = "cluster_labs";
static const char *CLUSTER_LABS_F1 = "hw_engine_init";
static const char *CLUSTER_LABS_F2 = "hw_mod_exp";
static const char *CLUSTER_LABS_F3 = "hw_mod_exp_crt";
static const char *CLUSTER_LABS_F4 = "hw_rsa_mod_exp";
static const char *CLUSTER_LABS_F5 = "hw_rsa_priv_enc";
static const char *CLUSTER_LABS_F6 = "hw_rsa_priv_dec";
static const char *CLUSTER_LABS_F7 = "hw_rsa_pub_enc";
static const char *CLUSTER_LABS_F8 = "hw_rsa_pub_dec";
static const char *CLUSTER_LABS_F20 = "hw_rand_bytes";
static const char *CLUSTER_LABS_F30 = "hw_dsa_sign";
static const char *CLUSTER_LABS_F31 = "hw_dsa_verify";