signet::forge::crypto::detail::gcm::GHashTable Struct Reference

4-bit precomputed table for constant-time GHASH multiplication. More...

#include <aes_gcm.hpp>

Public Member Functions
void	init (const Block128 &H)
	Precompute the 16-entry multiplication table from hash subkey H.

Public Attributes
Block128	entries [16]

Detailed Description

4-bit precomputed table for constant-time GHASH multiplication.

Stores M[i] = i * H in GF(2^128) for i in 0..15, where i is treated as a 4-bit GF(2) polynomial. Computed at GCM init time from the hash subkey H = AES_K(0^128).

Ref: NIST SP 800-38D §6.3, CWE-208 (constant-time requirement).

Definition at line 133 of file aes_gcm.hpp.

Member Function Documentation

init()

void signet::forge::crypto::detail::gcm::GHashTable::init ( const Block128 &  H )

inline

Precompute the 16-entry multiplication table from hash subkey H.

Definition at line 137 of file aes_gcm.hpp.

Member Data Documentation

entries

Block128 signet::forge::crypto::detail::gcm::GHashTable::entries[16]

Definition at line 134 of file aes_gcm.hpp.

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The documentation for this struct was generated from the following file:

• include/signet/crypto/aes_gcm.hpp