Net.Pkcs11Interop.LowLevelAPI40.Pkcs11.C_GetSlotList C# (CSharp) Method

        public CKR C_GetSlotList(bool tokenPresent, uint[] slotList, ref uint count)
        {
            if (this._disposed)
                throw new ObjectDisposedException(this.GetType().FullName);

            uint rv = _delegates.C_GetSlotList(tokenPresent, slotList, ref count);
            return (CKR)rv;
        }

        /// <summary>
        /// Finds slot containing the token that matches criteria specified in Settings class
        /// </summary>
        /// <param name='pkcs11'>Initialized PKCS11 wrapper</param>
        /// <returns>Slot containing the token that matches criteria</returns>
        public static uint GetUsableSlot(Pkcs11 pkcs11)
        {
            CKR rv = CKR.CKR_OK;

            // Get list of available slots with token present
            uint slotCount = 0;
            rv = pkcs11.C_GetSlotList(true, null, ref slotCount);
            if (rv != CKR.CKR_OK)
                Assert.Fail(rv.ToString());

            Assert.IsTrue(slotCount > 0);

            uint[] slotList = new uint[slotCount];

            rv = pkcs11.C_GetSlotList(true, slotList, ref slotCount);
            if (rv != CKR.CKR_OK)
                Assert.Fail(rv.ToString());

            // Return first slot with token present when both TokenSerial and TokenLabel are null...
            if (Settings.TokenSerial == null && Settings.TokenLabel == null)
                return slotList[0];

            // First slot with token present is OK...
            uint? matchingSlot = slotList[0];

            // ...unless there are matching criteria specified in Settings class
            if (Settings.TokenSerial != null || Settings.TokenLabel != null)
            {
                matchingSlot = null;

                foreach (uint slot in slotList)
                {
                    CK_TOKEN_INFO tokenInfo = new CK_TOKEN_INFO();
                    rv = pkcs11.C_GetTokenInfo(slot, ref tokenInfo);
                    if (rv != CKR.CKR_OK)
                    {
                        if (rv == CKR.CKR_TOKEN_NOT_RECOGNIZED || rv == CKR.CKR_TOKEN_NOT_PRESENT)
                            continue;
                        else
                            Assert.Fail(rv.ToString());
                    }

                    if (!string.IsNullOrEmpty(Settings.TokenSerial))
                        if (0 != string.Compare(Settings.TokenSerial, ConvertUtils.BytesToUtf8String(tokenInfo.SerialNumber, true), StringComparison.Ordinal))
                            continue;

                    if (!string.IsNullOrEmpty(Settings.TokenLabel))
                        if (0 != string.Compare(Settings.TokenLabel, ConvertUtils.BytesToUtf8String(tokenInfo.Label, true), StringComparison.Ordinal))
                            continue;

                    matchingSlot = slot;
                    break;
                }
            }

            Assert.IsTrue(matchingSlot != null, "Token matching criteria specified in Settings class is not present");
            return matchingSlot.Value;
        }