CMAC Calculator

Calculate CMAC (Cipher-based Message Authentication Code) using AES-CBC algorithm for secure data verification.

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About This Tool

This CMAC Online Tool allows you to generate Cipher-based Message Authentication Codes using the AES-CBC algorithm. CMAC is a cryptographic technique used to verify both the integrity and authenticity of a message. Enter your key (in hexadecimal format), message, and desired tag length, and the tool will compute the CMAC value. The implementation follows NIST standards and performs all calculations client-side in your browser for privacy and speed.

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How to Use

Enter a hexadecimal key (32, 48, or 64 characters for AES-128, AES-192, or AES-256 respectively).
Enter your message text in the input field.
Select the tag length (64 or 128 bits).
Click 'Calculate CMAC' to generate the authentication code.
View the result in hexadecimal format along with input details.

Frequently Asked Questions

Find Quick Answers

What is CMAC?

CMAC (Cipher-based Message Authentication Code) is a cryptographic algorithm that uses a block cipher (like AES) to generate a message authentication code for verifying data integrity and authenticity.

What key formats are supported?

Only hexadecimal keys are supported. For AES-128 use 32 hex characters (16 bytes), for AES-192 use 48 hex characters (24 bytes), and for AES-256 use 64 hex characters (32 bytes).

Is my data secure?

Yes, all calculations are performed entirely in your browser using JavaScript. No data is sent to any server, ensuring complete privacy.

What tag lengths are available?

You can choose between 64-bit (8 bytes) and 128-bit (16 bytes) tag lengths. 128-bit is recommended for stronger security.

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