using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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namespace com.alibaba.openapi.client.util
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{
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public class SignatureUtil
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{
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public static byte[] hmacSha1(String path, Dictionary<String, Object> parameters, String signingKey)
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{
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List<String> lists = new List<String>();
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foreach (KeyValuePair<string, object> kvp in parameters)
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{
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lists.Add(kvp.Key + kvp.Value);
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}
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lists.Sort(StringComparer.Ordinal);
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StringBuilder sb = new StringBuilder();
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sb.Append(path);
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foreach (String param in lists)
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{
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sb.Append(param);
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}
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String contentToHmac = sb.ToString();
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byte[] byteToHmac = System.Text.Encoding.UTF8.GetBytes(contentToHmac);
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byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(signingKey);
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HMACSHA1 hmac = new HMACSHA1(byteArray);
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byte[] hashValue = hmac.ComputeHash(byteToHmac, 0, byteToHmac.Length);
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return hashValue;
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}
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public static string toHex( byte[] bytes)
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{
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char[] c = new char[bytes.Length * 2];
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byte b;
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for (int bx = 0, cx = 0; bx < bytes.Length; ++bx, ++cx)
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{
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b = ((byte)(bytes[bx] >> 4));
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c[cx] = (char)(b > 9 ? b + 0x37 + 0x20 : b + 0x30);
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b = ((byte)(bytes[bx] & 0x0F));
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c[++cx] = (char)(b > 9 ? b + 0x37 + 0x20 : b + 0x30);
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}
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return new string(c).ToUpper();
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}
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public static byte[] hexToBytes( string str)
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{
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if (str.Length == 0 || str.Length % 2 != 0)
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return new byte[0];
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byte[] buffer = new byte[str.Length / 2];
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char c;
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for (int bx = 0, sx = 0; bx < buffer.Length; ++bx, ++sx)
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{
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// Convert first half of byte
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c = str[sx];
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buffer[bx] = (byte)((c > '9' ? (c > 'Z' ? (c - 'a' + 10) : (c - 'A' + 10)) : (c - '0')) << 4);
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// Convert second half of byte
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c = str[++sx];
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buffer[bx] |= (byte)(c > '9' ? (c > 'Z' ? (c - 'a' + 10) : (c - 'A' + 10)) : (c - '0'));
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}
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return buffer;
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}
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}
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}
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