示例#1
0
        /// <summary>
        /// Creates a new correlation vector by applying the Spin operator to an existing value.
        /// This should be done at the entry point of an operation.
        /// </summary>
        /// <param name="correlationVector">
        /// Taken from the message header indicated by <see cref="HeaderName"/>.
        /// </param>
        /// <param name="parameters">
        /// The parameters to use when applying the Spin operator.
        /// </param>
        /// <returns>A new correlation vector extended from the current vector.</returns>
        public new static CorrelationVectorV2 Spin(string correlationVector, SpinParameters parameters)
        {
            if (CorrelationVectorV2.IsImmutable(correlationVector))
            {
                return(CorrelationVectorV2.Parse(correlationVector));
            }

            if (CorrelationVectorV2.ValidateCorrelationVectorDuringCreation)
            {
                CorrelationVectorV2.Validate(correlationVector);
            }

            byte[] entropy = new byte[parameters.EntropyBytes];
            rng.NextBytes(entropy);

            ulong value = (ulong)(DateTime.UtcNow.Ticks >> parameters.TicksBitsToDrop);

            for (int i = 0; i < parameters.EntropyBytes; i++)
            {
                value = (value << 8) | Convert.ToUInt64(entropy[i]);
            }

            // Generate a bitmask and mask the lower TotalBits in the value.
            // The mask is generated by (1 << TotalBits) - 1. We need to handle the edge case
            // when shifting 64 bits, as it wraps around.
            value &= (parameters.TotalBits == 64 ? 0 : (ulong)1 << parameters.TotalBits) - 1;

            string s = unchecked ((uint)value).ToString();

            if (parameters.TotalBits > 32)
            {
                s = string.Concat((value >> 32).ToString(), ".", s);
            }

            string baseVector = string.Concat(correlationVector, ".", s);

            if (CorrelationVectorV2.IsOversized(baseVector, 0))
            {
                return(CorrelationVectorV2.Parse(correlationVector + CorrelationVectorV2.TerminationSign));
            }

            return(new CorrelationVectorV2(baseVector, 0, false));
        }
示例#2
0
        /// <summary>
        /// Creates a new correlation vector by extending an existing value. This should be
        /// done at the entry point of an operation.
        /// </summary>
        /// <param name="correlationVector">
        /// Taken from the message header indicated by <see cref="HeaderName"/>.
        /// </param>
        /// <returns>A new correlation vector extended from the current vector.</returns>
        public new static CorrelationVectorV2 Extend(string correlationVector)
        {
            if (CorrelationVectorV2.IsImmutable(correlationVector))
            {
                return(CorrelationVectorV2.Parse(correlationVector));
            }

            if (CorrelationVectorV2.ValidateCorrelationVectorDuringCreation)
            {
                CorrelationVectorV2.Validate(correlationVector);
            }

            if (CorrelationVectorV2.IsOversized(correlationVector, 0))
            {
                return(CorrelationVectorV2.Parse(correlationVector + CorrelationVectorV2.TerminationSign));
            }

            return(new CorrelationVectorV2(correlationVector, 0, false));
        }