int DSA_sign(int type, const unsigned char *dgst, int dlen,
unsigned char *sig, unsigned int *siglen, DSA *dsa);
int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
int DSA_sign(int type, const unsigned char *dgst, int dlen,
unsigned char *sig, unsigned int *siglen, DSA *dsa);
int DSA_verify(int type, const unsigned char *dgst, int dgst_len,