Sample C
This C class illustrates creating a digest token from three input parameters.
- strEncryptionMethod – lists the hash computation method (SHA1, SHA256 or MD5)
- message – lists the value to be converted into a digest token
- sharedKey – lists the secret key
Note: Use stronger secure hash algorithm like SHA256 for digest token generation.
This sample assumes:
- The web server supports C
- Other code calls this class and passes the expected parameters
Sample Code
private stringdigestData(string strEncryptionMethod , string message , string sharedKey ) {
UnicodeEncoding myUnicodeEncoding = new UnicodeEncoding ( ) ;
byte [ ] messageBytes = System. Text. Encoding. ASCII. GetBytes (message ) ;
byte [ ] sharedKeyBytes = System. Text. Encoding. ASCII. GetBytes (sharedKey ) ;
byte [ ] hashedMessage ;
string b64SHA1Message ;
if (this. DEBUG ) {
TextBoxMessage. Text = message ;
TextBoxSecret. Text = sharedKey ; }
switch ( (strEncryptionMethod ) )
{ case "SHA1" :
HMACSHA1 hmacsha1 = new HMACSHA1 ( ) ;
hmacsha1. Key = sharedKeyBytes ;
hashedMessage = hmacsha1. ComputeHash (messageBytes ) ;
b64SHA1Message = Convert. ToBase64String (hashedMessage ) ; if (this. DEBUG ) TextBoxDigest. Text = Convert. ToString (hashedMessage ) ; break ;
case "MD5" :
HMACMD5 hmacmd5 = new HMACMD5 (sharedKeyBytes ) ;
hashedMessage = hmacmd5. ComputeHash (messageBytes ) ;
b64SHA1Message = Convert. ToBase64String (hashedMessage ) ; if (this. DEBUG ) TextBoxDigest. Text = Convert. ToString (hashedMessage ) ; break ;
default :
b64SHA1Message = "Unknown Encryption Method" ; break ;
}
TextBoxBase64. Text = b64SHA1Message ; return b64SHA1Message ;
}