Function openssl_sys::EVP_DigestSignInit

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