在C#中使用OpenSSL进行哈希计算,你可以使用OpenSSL的EVP_Digest
函数。以下是一个示例代码,展示了如何使用OpenSSL的SHA256哈希算法来计算字符串的哈希值:
using System;
using System.Runtime.InteropServices;
class Program
{
static void Main()
{
string input = "Hello, world!";
string hash = ComputeHash(input, "SHA256");
Console.WriteLine($"Hash of '{input}' is: {hash}");
}
static string ComputeHash(string input, string algorithm)
{
byte[] inputBytes = Encoding.UTF8.GetBytes(input);
byte[] hashBytes = ComputeHash(inputBytes, algorithm);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < hashBytes.Length; i++)
{
sb.Append(hashBytes[i].ToString("x2"));
}
return sb.ToString();
}
static unsafe byte[] ComputeHash(byte[] input, string algorithm)
{
int hashSize = GetHashSize(algorithm);
byte[] hash = new byte[hashSize];
fixed (byte* inputPtr = input)
fixed (byte* hashPtr = hash)
{
using (OpenSSLHandle handle = OpenSSLHandle.Create())
{
int result = OpenSSLNative.EVP_Digest(handle, inputPtr, input.Length, hashPtr, hashSize, algorithm);
if (result != 0)
{
throw new Exception("OpenSSL error: " + result);
}
}
}
return hash;
}
static int GetHashSize(string algorithm)
{
switch (algorithm)
{
case "MD5":
return OpenSSLNative.EVP_MD_size("MD5");
case "SHA1":
return OpenSSLNative.EVP_MD_size("SHA1");
case "SHA256":
return OpenSSLNative.EVP_MD_size("SHA256");
case "SHA384":
return OpenSSLNative.EVP_MD_size("SHA384");
case "SHA512":
return OpenSSLNative.EVP_MD_size("SHA512");
default:
throw new ArgumentException("Unsupported algorithm", nameof(algorithm));
}
}
}
class OpenSSLHandle : IDisposable
{
private IntPtr handle;
public OpenSSLHandle()
{
handle = OpenSSLNative.EVP_MD_CTX_new();
if (handle == IntPtr.Zero)
{
throw new Exception("Failed to create OpenSSL handle");
}
}
public void Dispose()
{
if (handle != IntPtr.Zero)
{
OpenSSLNative.EVP_MD_CTX_free(handle);
handle = IntPtr.Zero;
}
}
}
static class OpenSSLNative
{
[DllImport("libssl", EntryPoint = "EVP_Digest")]
public static extern int EVP_Digest(IntPtr ctx, byte* input, int inputLen, byte* output, int outputLen, string mdName);
[DllImport("libssl", EntryPoint = "EVP_MD_size")]
public static extern int EVP_MD_size(string mdName);
[DllImport("libssl", EntryPoint = "EVP_MD_CTX_new")]
public static extern IntPtr EVP_MD_CTX_new();
[DllImport("libssl", EntryPoint = "EVP_MD_CTX_free")]
public static extern void EVP_MD_CTX_free(IntPtr ctx);
}
请注意,这个示例代码使用了OpenSSLNative
类来调用OpenSSL的本地库函数。你需要确保在你的项目中引用了OpenSSL库,并且在编译时设置了正确的库路径。此外,这个示例代码仅用于演示目的,实际应用中可能需要更多的错误处理和内存管理。
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