Function openssl_sys::EVP_DigestVerifyInit

pub unsafe extern fn EVP_DigestVerifyInit(ctx: *mut EVP_MD_CTX,
                                          pctx: *mut *mut EVP_PKEY_CTX,
                                          type_: *const EVP_MD,
                                          e: *mut ENGINE,
                                          pkey: *mut EVP_PKEY)
                                          -> c_int