Module gcm

dcrypt_algorithms::aead

Module gcm 

Source
Expand description

Galois/Counter Mode (GCM) for authenticated encryption

GCM is an authenticated encryption with associated data (AEAD) mode that provides both confidentiality and authenticity. It combines the Counter (CTR) mode with the GHASH authentication function.

§Implementation Note

This implementation has been validated against official NIST Cryptographic Algorithm Validation Program (CAVP) test vectors. It follows the Galois/Counter Mode (GCM) specification as defined in NIST Special Publication 800-38D.

§Constant-Time Guarantees

This implementation is designed to be timing-attack resistant:

  • All cryptographic operations are performed before authentication validation
  • Authentication tag verification uses the subtle crate’s constant-time comparison
  • Timing-safe conditional operations are performed without data-dependent branches
  • Memory barriers prevent compiler optimizations that could introduce timing variation

Structs§

Gcm
GCM mode implementation
GcmDecryptOperation
Operation for GCM decryption operations
GcmEncryptOperation
Operation for GCM encryption operations