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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。
