Function SymCryptEcDsaSign 

pub unsafe extern "C" fn SymCryptEcDsaSign(
    pKey: PCSYMCRYPT_ECKEY,
    pbHashValue: PCBYTE,
    cbHashValue: SIZE_T,
    format: SYMCRYPT_NUMBER_FORMAT,
    flags: UINT32,
    pbSignature: PBYTE,
    cbSignature: SIZE_T,
) -> SYMCRYPT_ERROR