Crypto Checksum Verifier
Calculate and verify CRC, LRC, Retail-MAC, and AES-CMAC checksums for smart card data. Supports all common algorithms used in APDU transmission, EMV data, and GlobalPlatform SCP. All computation via Web Crypto API — no data uploaded.
Input
Result
Select algorithm, enter data, click Calculate
How to Use
CRC/LRC: Enter hex data, select algorithm, get instant checksum. Use to verify APDU data integrity or generate LRC for T=1 blocks.
MAC (Retail/AES-CMAC): Provide a hex key. The Web Crypto API performs the computation entirely in your browser. Use for GlobalPlatform SCP02 session key verification, EMV secure messaging, and APDU command authentication.
Related Tools
Key Diversification Calculator | GP Session Key Calculator | APDU Command Builder