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C# 快速哈希计算

发布于 2024-07-25 18:44:30 字数 316 浏览 5 评论 0原文

我正在寻找本机 MD5 或 SHA1 库的 ac# 包装器，以提高哈希计算性能。

之前我将 SharpZipLib 切换为 zlib，并获得了超过 2 倍的性能提升。（好吧，你必须注意你有正确的 zlib.so 或 zlib.dll，具体取决于操作系统和硬件，但它是有回报的）。

MD5 或 SHA1 是否值得，或者 .NET 和 Mono 都依赖本机实现？

（已编辑）另外：如果我必须坚持使用 MD5CryptoServiceProvider，有没有一种方法可以在读取文件时计算文件的哈希值？我的意思是，以块的形式发送字节但仍然计算整个哈希值？

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药祭#氼 2024-08-01 18:44:30

MD5 和 SHA1 依赖于本机实现，尽管如此，C++ 解决方案 + introp 可能会稍微快一些，因为您可以稍微减少方法调用的数量并优化本机实现。

请记住，本机 (SHA1CryptoServiceProvider) 的速度比托管 (SHA1Managed) 快 3 倍。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Security.Cryptography;

namespace ConsoleApplication22 {



    class Program {

        static void Profile(string description, int iterations, Action func) {

            // clean up
            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();

            // warm up 
            func();

            var watch = Stopwatch.StartNew();
            for (int i = 0; i < iterations; i++) {
                func();
            }
            watch.Stop();
            Console.Write(description);
            Console.WriteLine(" Time Elapsed {0} ms", watch.ElapsedMilliseconds);
        }

        static void Main() {
            SHA1Managed managed = new SHA1Managed();
            SHA1CryptoServiceProvider unmanaged = new SHA1CryptoServiceProvider();

            Random rnd = new Random();

            var buffer = new byte[100000];
            rnd.NextBytes(buffer);

            Profile("managed", 1000, () => {
                managed.ComputeHash(buffer, 0, buffer.Length);
            });

            Profile("unmanaged", 1000, () =>
            {
                unmanaged.ComputeHash(buffer, 0, buffer.Length);
            });

            Console.ReadKey();
        }
    }
}

managed Time Elapsed 891 ms
unmanaged Time Elapsed 336 ms

另请记住除非我的计算错误，否则非托管实现会在大约 300 毫秒内对 100MB 数据进行哈希处理，这很少会成为瓶颈。

MD5 and SHA1 rely on native implementaions, nonetheless its possible a C++ solution + introp could be slightly faster, cause you could possibly reduce the number of method calls a bit and optimize the native implementation.

Keep in mind that the Native (SHA1CryptoServiceProvider) can be 3X faster than the managed one(SHA1Managed).

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Security.Cryptography;

namespace ConsoleApplication22 {



    class Program {

        static void Profile(string description, int iterations, Action func) {

            // clean up
            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();

            // warm up 
            func();

            var watch = Stopwatch.StartNew();
            for (int i = 0; i < iterations; i++) {
                func();
            }
            watch.Stop();
            Console.Write(description);
            Console.WriteLine(" Time Elapsed {0} ms", watch.ElapsedMilliseconds);
        }

        static void Main() {
            SHA1Managed managed = new SHA1Managed();
            SHA1CryptoServiceProvider unmanaged = new SHA1CryptoServiceProvider();

            Random rnd = new Random();

            var buffer = new byte[100000];
            rnd.NextBytes(buffer);

            Profile("managed", 1000, () => {
                managed.ComputeHash(buffer, 0, buffer.Length);
            });

            Profile("unmanaged", 1000, () =>
            {
                unmanaged.ComputeHash(buffer, 0, buffer.Length);
            });

            Console.ReadKey();
        }
    }
}

managed Time Elapsed 891 ms
unmanaged Time Elapsed 336 ms

Also Keep in mind unless my calculation is wrong, the unmanaged implementation is hashing 100MB of data in about 300 milliseconds, this would very rarely be a bottleneck.

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