Module aes256_cbc_hmac_sha256_ae 

Legacy AES-256-CBC-HMAC-SHA256 operations

Aes256CbcHmacSha256 is the construct used in type 2 EncStrings. It is authenticated encryption (AE) via Encrypt-then-MAC, but has no support for associated data (it is not AEAD).

Structs

Aes256CbcHmacSha256 🔒

The legacy AES-256-CBC-HMAC-SHA256 Encrypt-then-MAC cipher. The 64-byte composite key is the AES-256-CBC encryption sub-key (first 32 bytes) followed by the HMAC-SHA256 authentication sub-key (last 32 bytes).

Constants

ENC_KEY_SIZE 🔒

IV_SIZE 🔒

KEY_SIZE 🔒

MAC_KEY_SIZE 🔒

MAC_SIZE 🔒

Functions

calculate_mac 🔒

Generate a MAC using HMAC-SHA256 over the IV and ciphertext, without length prefixes or associated data.

split_to_subkeys 🔒

Splits the 64-byte composite key into zero-copy views over its encryption and MAC halves.

Type Aliases

HmacSha256 🔒