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cake-buildGH-2099: Also takes care of RFC-02.
This is the same as pull request 2650 but has been updated to match the change made in Cake version 1.0.0.
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// Licensed to the .NET Foundation under one or more agreements. | ||
// The .NET Foundation licenses this file to you under the MIT license. | ||
// See the LICENSE file in the project root for more information. | ||
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using System; | ||
using System.Collections.Generic; | ||
using System.Security.Cryptography; | ||
using System.Text; | ||
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namespace Cake.Utilities | ||
{ | ||
/// <summary> | ||
/// Optimized hash generator. Using SHA1CryptoServiceProvider since it is FIPS compliant. | ||
/// </summary> | ||
internal static class FastHash | ||
{ | ||
/// <summary> | ||
/// Generates a hash of the passed byte arrays. | ||
/// </summary> | ||
/// <param name="input">The binary data to hash.</param> | ||
/// <returns>The hash value.</returns> | ||
public static string GenerateHash(byte[] input) | ||
{ | ||
using (var sha1 = new SHA1CryptoServiceProvider()) | ||
{ | ||
sha1.TransformBlock(input, 0, input.Length, input, 0); | ||
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// Just finalize with empty bytes so we don't have to iterate over the enumerable multiple times | ||
sha1.TransformFinalBlock(Encoding.UTF8.GetBytes(string.Empty), 0, 0); | ||
// Convert to hex string; This method is supposedly faster than the usual StringBuilder approach | ||
return ConvertBits(sha1.Hash); | ||
} | ||
} | ||
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/// <summary> | ||
/// Generates a hash of the passed byte arrays. | ||
/// </summary> | ||
/// <param name="inputs">The binary data to hash.</param> | ||
/// <returns>The hash value.</returns> | ||
public static string GenerateHash(IEnumerable<byte[]> inputs) | ||
{ | ||
using (var sha1 = new SHA1CryptoServiceProvider()) | ||
{ | ||
foreach (var input in inputs) | ||
{ | ||
sha1.TransformBlock(input, 0, input.Length, input, 0); | ||
} | ||
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// Just finalize with empty bytes so we don't have to iterate over the enumerable multiple times | ||
sha1.TransformFinalBlock(Encoding.UTF8.GetBytes(string.Empty), 0, 0); | ||
// Convert to hex string; This method is supposedly faster than the usual StringBuilder approach | ||
return ConvertBits(sha1.Hash); | ||
} | ||
} | ||
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private static string ConvertBits(byte[] hash) | ||
{ | ||
return BitConverter.ToString(hash) | ||
// without dashes | ||
.Replace("-", string.Empty) | ||
// make lowercase | ||
.ToLower(); | ||
} | ||
} | ||
} |