去除unsafe代码，优化MD5加密性能，优化MD5比较性能 · Pull Request !71 · dotNET China/Furion

### 描述
优化MD5加密性能
去除unsafe代码，优化MD5加密性能，优化MD5比较性能

### 基准测试
``` ini
 MD5加密性能基准测试

BenchmarkDotNet=v0.12.1, OS=Windows 10.0.19042
Intel Core i7-6700K CPU 4.00GHz (Skylake), 1 CPU, 8 logical and 4 physical cores
.NET Core SDK=5.0.100
  [Host]     : .NET Core 5.0.0 (CoreCLR 5.0.20.51904, CoreFX 5.0.20.51904), X64 RyuJIT  [AttachedDebugger]
  DefaultJob : .NET Core 5.0.0 (CoreCLR 5.0.20.51904, CoreFX 5.0.20.51904), X64 RyuJIT

```
|         Method |     Mean |   Error |  StdDev |  Gen 0 | Gen 1 | Gen 2 | Allocated |
|--------------- |---------:|--------:|--------:|-------:|------:|------:|----------:|
| TestEncryptNew | 343.3 ns | 1.44 ns | 1.28 ns | 0.0744 |     - |     - |     312 B |
|    TestEncrypt | 615.7 ns | 2.38 ns | 2.22 ns | 0.0839 |     - |     - |     352 B |

``` ini
比较方法基准测试(性能进步大, 但是可以忽略)

BenchmarkDotNet=v0.12.1, OS=Windows 10.0.19042
Intel Core i7-6700K CPU 4.00GHz (Skylake), 1 CPU, 8 logical and 4 physical cores
.NET Core SDK=5.0.100
  [Host]     : .NET Core 5.0.0 (CoreCLR 5.0.20.51904, CoreFX 5.0.20.51904), X64 RyuJIT  [AttachedDebugger]
  DefaultJob : .NET Core 5.0.0 (CoreCLR 5.0.20.51904, CoreFX 5.0.20.51904), X64 RyuJIT

```
|         Method |      Mean |     Error |    StdDev | Gen 0 | Gen 1 | Gen 2 | Allocated |
|--------------- |----------:|----------:|----------:|------:|------:|------:|----------:|
| SingleCompareNew | 0.9664 ns | 0.0196 ns | 0.0184 ns |     - |     - |     - |         - |
|    SingleCompare | 1.7913 ns | 0.0620 ns | 0.0609 ns |     - |     - |     - |         - |

类型	指派人员	状态
审查	百小僧已审查通过	已完成 (1/1人)
测试	百小僧已测试通过	已完成 (1/1人)

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