PKCS7_ctrl
LCRYPTO_USED(PKCS7_ctrl);
LCRYPTO_ALIAS(PKCS7_ctrl);
PKCS7_ctrl(p,PKCS7_OP_SET_DETACHED_SIGNATURE,v,NULL)
PKCS7_ctrl(p,PKCS7_OP_GET_DETACHED_SIGNATURE,0,NULL)
long PKCS7_ctrl(PKCS7 *p7, int cmd, long larg, char *parg);