HMAC Generator Tool
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Generate secure Hash-based Message Authentication Code (HMAC) for message authentication and data integrity verification.
About HMAC (Hash-based Message Authentication Code)
What is HMAC?
HMAC (Hash-based Message Authentication Code) is a specific construction for calculating a message authentication code involving a cryptographic hash function in combination with a secret cryptographic key. It provides both data integrity and message authentication, ensuring that the message hasn't been tampered with and verifying the sender's identity.
Key Features
- • Message Authentication: Verify message sender identity
- • Data Integrity: Detect any message modifications
- • Secret Key Required: Only parties with the key can verify
- • Multiple Algorithms: Works with SHA-256, SHA-512, MD5
- • Industry Standard: RFC 2104 compliant
Common Use Cases
- • API Authentication: Secure REST API requests
- • Webhook Verification: Validate webhook payloads
- • JWT Signatures: Sign JSON Web Tokens
- • Session Tokens: Create secure session identifiers
- • File Integrity: Verify file authenticity
- • Database Security: Protect sensitive data
Supported Algorithms
- • HMAC-SHA256: Most widely used, high security
- • HMAC-SHA512: Maximum security, larger output
- • HMAC-MD5: Legacy support, not recommended
- • HMAC-SHA1: Legacy support, moderate security
Security Best Practices
- • Use SHA-256 or SHA-512 for new applications
- • Keep secret keys secure and rotate them regularly
- • Use sufficiently long random keys (at least 256 bits)
- • Never hardcode secret keys in your source code
- • Always verify HMAC before processing messages
- • All processing is done client-side - your keys never leave your browser