## GCM **Kind**: global class **this**: {GCM} * [GCM](#GCM) * [new GCM()](#new_GCM_new) * [.init(nk, key, niv, iv)](#GCM+init) * [.add_header(header, len)](#GCM+add_header) * [.add_plain(plain, len)](#GCM+add_plain) ⇒ * [.add_cipher(cipher, len)](#GCM+add_cipher) ⇒ ### new GCM() Creates an instance of GCM ### gcM.init(nk, key, niv, iv) Initialize GCM mode **Kind**: instance method of [GCM](#GCM) **this**: {GCM} | Param | Description | | --- | --- | | nk | is the key length in bytes, 16, 24 or 32 | | key | the AES key as an array of 16 bytes | | niv | the number of bytes in the Initialisation Vector (IV) | | iv | the IV | ### gcM.add\_header(header, len) Add header (material to be authenticated but not encrypted) **Kind**: instance method of [GCM](#GCM) **this**: {GCM} | Param | Description | | --- | --- | | header | is the header material to be added | | len | the number of bytes in the header | ### gcM.add\_plain(plain, len) ⇒ Add plaintext and extract ciphertext **Kind**: instance method of [GCM](#GCM) **Returns**: cipher is the ciphertext generated **this**: {GCM} | Param | Description | | --- | --- | | plain | is the plaintext material to be added | | len | the number of bytes in the plaintext | ### gcM.add\_cipher(cipher, len) ⇒ Add Ciphertext - decrypts to plaintext **Kind**: instance method of [GCM](#GCM) **Returns**: plain is the plaintext material generated **this**: {GCM} | Param | Description | | --- | --- | | cipher | is the ciphertext to be added | | len | the number of bytes in the plaintext |