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  1. using System;
  2. using System.Text;
  3. using System.Security.Cryptography;
  4.  
  5. public class Program
  6. {
  7. 	public static void Main()
  8. 	{
  9. 		string httpMethod = "POST";
  10. 		string timeStamp = "2026-04-06T14:16:24+07:00";
  11. 		string accessToken = "A60CDE9tiT6PHzJjE6mqiyE6w0q4eQ2vsYWz0PUELAOWfcEnZbnwbhMM";
  12. 		string relativeUrl = "/api/v3.0/account-inquiry-external";
  13. 		string clientSecret = "26b796b5-2f05-41a6-bca0-c43f7df289a8";
  14. 		string body = "{\"beneficiaryAccountNo\":\"888801000003301\",\"beneficiaryBankCode\":\"014\",\"additionalInfo\":{\"trxType\":\"01\",\"sourceAccountNo\":\"003694475058\"}}";
  15.  
  16.  
  17. 		string signature = GetSignature(httpMethod, accessToken, relativeUrl, body, clientSecret, timeStamp);
  18.  
  19. 		Console.WriteLine("Generated Signature:");
  20. 		Console.WriteLine(signature);
  21. 	}
  22.  
  23. 	public static string GetSignature(string HTTPMethod, string accessToken, string RelativeUrl, string body, string clientSecret, string timeStamp)
  24. 	{
  25. 		string MinifyReqBody = MinifyJson(body);
  26. 		string finalReqBody = CalculateRequestBodyHash(MinifyReqBody);
  27.  
  28. 		// Pattern: HTTPMethod:RelativeUrl:AccessToken:RequestBodyHash:Timestamp
  29. 		string stringToSign = string.Format("{0}:{1}:{2}:{3}:{4}", HTTPMethod, RelativeUrl, accessToken, finalReqBody, timeStamp);
  30.  
  31. 		Console.WriteLine("String To Sign: " + stringToSign);
  32.  
  33. 		return GenerateSignatureHMACSHA512(clientSecret, stringToSign);
  34. 	}
  35.  
  36. 	public static string MinifyJson(string json)
  37. 	{
  38. 		StringBuilder sb = new StringBuilder();
  39. 		bool insideString = false;
  40.  
  41. 		foreach (char c in json)
  42. 		{
  43. 			if (c == '"')
  44. 			{
  45. 				insideString = !insideString;
  46. 			}
  47.  
  48. 			if (!char.IsWhiteSpace(c) || insideString)
  49. 			{
  50. 				sb.Append(c);
  51. 			}
  52. 		}
  53.  
  54. 		return sb.ToString();
  55. 	}
  56.  
  57. 	public static string CalculateRequestBodyHash(string requestBody)
  58. 	{
  59. 		using (SHA256 sha256 = SHA256.Create())
  60. 		{
  61. 			byte[] hashBytes = sha256.ComputeHash(Encoding.UTF8.GetBytes(requestBody));
  62. 			// Returns hex string in lowercase without dashes
  63. 			return BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
  64. 		}
  65. 	}
  66.  
  67. 	public static string GenerateSignatureHMACSHA512(string privateKey, string stringToSign)
  68. 	{
  69. 		try
  70. 		{
  71. 			using (HMACSHA512 hmac = new HMACSHA512(Encoding.UTF8.GetBytes(privateKey)))
  72. 			{
  73. 				byte[] hashBytes = hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign));
  74. 				return Convert.ToBase64String(hashBytes);
  75. 			}
  76. 		}
  77. 		catch (Exception ex)
  78. 		{
  79. 			Console.WriteLine("Error: " + ex.Message);
  80. 			return null;
  81. 		}
  82. 	}
  83. }
Success #stdin #stdout 0.08s 35044KB
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Standard input is empty
stdout
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String To Sign: POST:/api/v3.0/account-inquiry-external:A60CDE9tiT6PHzJjE6mqiyE6w0q4eQ2vsYWz0PUELAOWfcEnZbnwbhMM:138ffbfaf4b95441679dfe2d9008c7212d4e07dd0d73d8d4db84a9da2126521b:2026-04-06T14:16:24+07:00
Generated Signature:
8AnvNmNEEIhCInT18DNLAuNGtC0JEZWXSXMJdv0Dl45NQ+qG54qIa1bP/vJpZFyCg8w/kpWhRSRkMgb0wsQmug==
https://ideone.com/kTOBVf
language:
C# (NET 6.0)
created:
1 day ago
visibility:
public

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