public static string DecodeOid()

in src/PFXImportPowershell/EncryptionUtilities/Source/DerUtils.cs [382:436]
48 lines of code
8 McCabe index (conditional complexity)

        public static string DecodeOid(byte[] bytes)
        {
            StringBuilder oidDotStr = new StringBuilder();
            if (bytes == null)
            {
                throw new ArgumentNullException("bytes");
            }

            if (bytes.Length < 1)
            {
                throw new ArgumentException("Input bytes are not valid DER format");
            }

            if(bytes[0] != TagOid)
            {
                throw new ArgumentException("Not an OID entry");
            }
            uint dataLength;
            uint lengthBytesUsed;
            DecodeLength(bytes, 1, out dataLength, out lengthBytesUsed);

            // validate data size
            if (bytes.Length != 1 + lengthBytesUsed + dataLength)
            {
                throw new ArgumentException("Input bytes are not valid DER format");
            }

            uint position = 1 + lengthBytesUsed;
            oidDotStr.Append(bytes[position] / 40).Append(".").Append(bytes[position] % 40);
            position++;
            while(position < bytes.Length)
            {
                if(bytes[position] < 0x80)
                {
                    oidDotStr.Append(".").Append(bytes[position]);
                    position++;
                }
                else
                {
                    int nodeValue = 0;

                    while(bytes[position] > 0x80)
                    {
                        nodeValue += bytes[position] & 0x7f;
                        nodeValue <<= 7;
                        position++;
                    }
                    nodeValue += bytes[position];
                    oidDotStr.Append(".").Append(nodeValue);
                    position++;
                }
            }

            return oidDotStr.ToString(); ;
        }