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HMac
Last update:
May 18, 2026
Description
Creates Hash-based Message Authentication Code for the given string based on the algorithm and encoding. Hash-based Message Authentication Code (HMAC) is used to verify the data integrity and authenticity of a message transmitted. It involves a cryptographic hash function in combination with a secret key. The cryptographic hash function can be Message Digest 5 (MD5), Secure Hash Algorithm (SHA), and so on.
Returns
An encoded string
Category
History
ColdFusion 10: Added this function.
Syntax
HMac(message, key [,algorithm] [,encoding])See also
History
ColdFusion 10: Added this function.
Parameters
Parameter | Required\Optional | Description |
message | Required | The message to transmit. The message can be a String or a byte array. |
key | Required | The secret key to create HMAC. The key can be a String or a byte array. |
algorithm | Optional | The hash algorithm to use. The following is a list of HMAC algorithms:
|
encoding | Optional | The character encoding to use. |
Usage
Use this function to create Hash-based Message Authentication Code for the given string based on the algorithm and encoding.
Example
<cfscript>
x=hmac("Hi There","key1","HMACRIPEMD160")
writeOutput(x) // 4E1A31DD8A26BDB9344D391D44DDCA9B28F10739
</cfscript>
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