Java中的数据加密算法，如何在.Net中实现？

Question

Java中的数据加密算法，如何在.Net中实现？

Java中的加密算法

package interfaces.service.http.controller;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

public class SignUtil {
    private static final String CONTENT_CHARSET = "UTF-8";

    private static final String HMAC_ALGORITHM = "HmacSHA1";

    private static char[] base64EncodeChars = new char[]{'A', 'B', 'C', 'D',
            'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
            'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
            'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
            'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3',
            '4', '5', '6', '7', '8', '9', '+', '/'};

    public static String sign(String secret, String timeStr)
            throws NoSuchAlgorithmException, UnsupportedEncodingException, InvalidKeyException {
        //获取签名字符串
        String signStr = "date: " + timeStr + "\n" + "source: " + "source";
        //获取接口签名
        String sig;
        Mac mac1 = Mac.getInstance(HMAC_ALGORITHM);
        byte[] hash;
        SecretKeySpec secretKey = new SecretKeySpec(secret.getBytes(CONTENT_CHARSET), mac1.getAlgorithm());
        mac1.init(secretKey);
        hash = mac1.doFinal(signStr.getBytes(CONTENT_CHARSET));
        sig = encode(hash);
        return sig;
    }


    private static String encode(byte[] data) {
        StringBuffer sb = new StringBuffer();
        int len = data.length;
        int i = 0;
        int b1, b2, b3;
        while (i < len) {
            b1 = data[i++] & 0xff;
            if (i == len) {
                sb.append(base64EncodeChars[b1 >>> 2]);
                sb.append(base64EncodeChars[(b1 & 0x3) << 4]);
                sb.append("==");
                break;
            }
            b2 = data[i++] & 0xff;
            if (i == len) {
                sb.append(base64EncodeChars[b1 >>> 2]);
                sb.append(base64EncodeChars[((b1 & 0x03) << 4)
                        | ((b2 & 0xf0) >>> 4)]);
                sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);
                sb.append("=");
                break;
            }
            b3 = data[i++] & 0xff;
            sb.append(base64EncodeChars[b1 >>> 2]);
            sb.append(base64EncodeChars[((b1 & 0x03) << 4)
                    | ((b2 & 0xf0) >>> 4)]);
            sb.append(base64EncodeChars[((b2 & 0x0f) << 2)
                    | ((b3 & 0xc0) >>> 6)]);
            sb.append(base64EncodeChars[b3 & 0x3f]);
        }
        return sb.toString();
    }
}

请问如何用.Net实现上面Java代码中的签名方法？

Answer 1

来自NewBing和LP的编写：

• 在.NET中实现与Java代码中相同的签名方法，你可以使用.NET中的 System.Security.Cryptography.HMACSHA1 类和 Base64 编码来实现。下面是等效的.NET代码示例：

using System;
using System.Security.Cryptography;
using System.Text;

public class SignUtil
{
    private static readonly string CONTENT_CHARSET = "UTF-8";
    private static readonly string HMAC_ALGORITHM = "HmacSHA1";

    private static char[] base64EncodeChars = new char[]
    {
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
        'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
        'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y',
        'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
    };

    public static string Sign(string secret, string timeStr)
    {
        string signStr = "date: " + timeStr + "\n" + "source: " + "source";
        byte[] secretBytes = Encoding.GetEncoding(CONTENT_CHARSET).GetBytes(secret);
        byte[] signBytes = Encoding.GetEncoding(CONTENT_CHARSET).GetBytes(signStr);

        using (HMACSHA1 hmac = new HMACSHA1(secretBytes))
        {
            byte[] hash = hmac.ComputeHash(signBytes);
            string sig = Encode(hash);
            return sig;
        }
    }

    private static string Encode(byte[] data)
    {
        StringBuilder sb = new StringBuilder();
        int len = data.Length;
        int i = 0;
        int b1, b2, b3;

        while (i < len)
        {
            b1 = data[i++] & 0xff;

            if (i == len)
            {
                sb.Append(base64EncodeChars[b1 >> 2]);
                sb.Append(base64EncodeChars[(b1 & 0x3) << 4]);
                sb.Append("==");
                break;
            }

            b2 = data[i++] & 0xff;

            if (i == len)
            {
                sb.Append(base64EncodeChars[b1 >> 2]);
                sb.Append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >> 4)]);
                sb.Append(base64EncodeChars[(b2 & 0x0f) << 2]);
                sb.Append("=");
                break;
            }

            b3 = data[i++] & 0xff;
            sb.Append(base64EncodeChars[b1 >> 2]);
            sb.Append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >> 4)]);
            sb.Append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >> 6)]);
            sb.Append(base64EncodeChars[b3 & 0x3f]);
        }

        return sb.ToString();
    }
}