ocrypto_aes_gcm.h

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/*
 * Copyright (c) 2016 - 2025 Nordic Semiconductor ASA
 * Copyright (c) since 2013 Oberon microsystems AG
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
 
 
#ifndef OCRYPTO_AES_GCM_H
#define OCRYPTO_AES_GCM_H
 
#include <stddef.h>
#include <stdint.h>
 
 
#ifdef __cplusplus
extern "C" {
#endif
 
 
typedef struct {
    uint32_t xkey[60];
    uint8_t  counter[16];
    uint8_t  cipher[16];
    uint8_t  x[16];
    uint8_t  m[16];
    uint8_t  position; // Current position in cipher.
    uint8_t  length;   // Data length added to x.
    uint8_t  key_size; // Key size (16, 24, or 32 bytes).
    size_t   ct_len;   // Total ciphertext length
    size_t   aa_len;   // Total aad length.
} ocrypto_aes_gcm_ctx;
void ocrypto_aes_gcm_init(ocrypto_aes_gcm_ctx *ctx, const uint8_t *key, size_t size, const uint8_t iv[12]);
 
void ocrypto_aes_gcm_init_iv(ocrypto_aes_gcm_ctx* ctx, const uint8_t* iv, size_t iv_len);
 
void ocrypto_aes_gcm_update_aad(ocrypto_aes_gcm_ctx *ctx, const uint8_t *aa, size_t aa_len);
 
void ocrypto_aes_gcm_update_enc(ocrypto_aes_gcm_ctx *ctx, uint8_t* ct, const uint8_t* pt, size_t pt_len);
 
void ocrypto_aes_gcm_update_dec(ocrypto_aes_gcm_ctx *ctx, uint8_t* pt, const uint8_t* ct, size_t ct_len);
 
void ocrypto_aes_gcm_final_enc(ocrypto_aes_gcm_ctx *ctx, uint8_t *tag, size_t tag_len);
 
int ocrypto_aes_gcm_final_dec(ocrypto_aes_gcm_ctx *ctx, const uint8_t *tag, size_t tag_len);
 
void ocrypto_aes_gcm_encrypt (
    uint8_t* ct, uint8_t *tag, size_t tag_len, const uint8_t* pt, size_t pt_len,
    const uint8_t *key, size_t size, const uint8_t iv[12], const uint8_t *aa, size_t aa_len);
 
int ocrypto_aes_gcm_decrypt (
    uint8_t* pt, const uint8_t *tag, size_t tag_len, const uint8_t* ct, size_t ct_len,
    const uint8_t *key, size_t size, const uint8_t iv[12], const uint8_t *aa, size_t aa_len);
 
 
#ifdef __cplusplus
}
#endif
 
#endif