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- /*
- * Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the License); you may
- * not use this file except in compliance with the License.
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- */
- #ifndef GMSSL_GCM_H
- #define GMSSL_GCM_H
- #include <stdlib.h>
- #include <stdint.h>
- #include <string.h>
- #include <gmssl/gf128.h>
- #include <gmssl/block_cipher.h>
- #ifdef __cplusplus
- extern "C" {
- #endif
- #define GCM_IV_MIN_SIZE 1
- #define GCM_IV_MAX_SIZE ((uint64_t)(1 << (64-3)))
- #define GCM_IV_DEFAULT_BITS 96
- #define GCM_IV_DEFAULT_SIZE 12
- #define GCM_MIN_AAD_SIZE 0
- #define GCM_MAX_AAD_SIZE ((uint64_t)(1 << (64-3)))
- #define GCM_MIN_PLAINTEXT_SIZE 0
- #define GCM_MAX_PLAINTEXT_SIZE ((((uint64_t)1 << 39) - 256) >> 3)
- #define GHASH_SIZE (16)
- #define GCM_IS_LITTLE_ENDIAN 1
- void ghash(const uint8_t h[16], const uint8_t *aad, size_t aadlen,
- const uint8_t *c, size_t clen, uint8_t out[16]);
- typedef struct {
- gf128_t H;
- gf128_t X;
- size_t aadlen;
- size_t clen;
- uint8_t block[16];
- size_t num;
- } GHASH_CTX;
- void ghash_init(GHASH_CTX *ctx, const uint8_t h[16], const uint8_t *aad, size_t aadlen);
- void ghash_update(GHASH_CTX *ctx, const uint8_t *c, size_t clen);
- void ghash_finish(GHASH_CTX *ctx, uint8_t out[16]);
- int gcm_encrypt(const BLOCK_CIPHER_KEY *key, const uint8_t *iv, size_t ivlen,
- const uint8_t *aad, size_t aadlen, const uint8_t *in, size_t inlen,
- uint8_t *out, size_t taglen, uint8_t *tag);
- int gcm_decrypt(const BLOCK_CIPHER_KEY *key, const uint8_t *iv, size_t ivlen,
- const uint8_t *aad, size_t aadlen, const uint8_t *in, size_t inlen,
- const uint8_t *tag, size_t taglen, uint8_t *out);
- #ifdef __cplusplus
- }
- #endif
- #endif
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