mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-12-03 10:24:20 +01:00
6c05208f96
Fix implementation and documentation missmatch for the function arguments to mbedtls_gcm_finish(). Also, removed redundant if condition that always evaluates to true.
221 lines
7.5 KiB
C
221 lines
7.5 KiB
C
/**
|
|
* \file gcm.h
|
|
*
|
|
* \brief Galois/Counter mode for 128-bit block ciphers
|
|
*
|
|
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
* not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* This file is part of mbed TLS (https://tls.mbed.org)
|
|
*/
|
|
#ifndef MBEDTLS_GCM_H
|
|
#define MBEDTLS_GCM_H
|
|
|
|
#include "cipher.h"
|
|
|
|
#include <stdint.h>
|
|
|
|
#define MBEDTLS_GCM_ENCRYPT 1
|
|
#define MBEDTLS_GCM_DECRYPT 0
|
|
|
|
#define MBEDTLS_ERR_GCM_AUTH_FAILED -0x0012 /**< Authenticated decryption failed. */
|
|
#define MBEDTLS_ERR_GCM_BAD_INPUT -0x0014 /**< Bad input parameters to function. */
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* \brief GCM context structure
|
|
*/
|
|
typedef struct {
|
|
mbedtls_cipher_context_t cipher_ctx;/*!< cipher context used */
|
|
uint64_t HL[16]; /*!< Precalculated HTable */
|
|
uint64_t HH[16]; /*!< Precalculated HTable */
|
|
uint64_t len; /*!< Total data length */
|
|
uint64_t add_len; /*!< Total add length */
|
|
unsigned char base_ectr[16];/*!< First ECTR for tag */
|
|
unsigned char y[16]; /*!< Y working value */
|
|
unsigned char buf[16]; /*!< buf working value */
|
|
int mode; /*!< Encrypt or Decrypt */
|
|
}
|
|
mbedtls_gcm_context;
|
|
|
|
/**
|
|
* \brief Initialize GCM context (just makes references valid)
|
|
* Makes the context ready for mbedtls_gcm_setkey() or
|
|
* mbedtls_gcm_free().
|
|
*
|
|
* \param ctx GCM context to initialize
|
|
*/
|
|
void mbedtls_gcm_init( mbedtls_gcm_context *ctx );
|
|
|
|
/**
|
|
* \brief GCM initialization (encryption)
|
|
*
|
|
* \param ctx GCM context to be initialized
|
|
* \param cipher cipher to use (a 128-bit block cipher)
|
|
* \param key encryption key
|
|
* \param keybits must be 128, 192 or 256
|
|
*
|
|
* \return 0 if successful, or a cipher specific error code
|
|
*/
|
|
int mbedtls_gcm_setkey( mbedtls_gcm_context *ctx,
|
|
mbedtls_cipher_id_t cipher,
|
|
const unsigned char *key,
|
|
unsigned int keybits );
|
|
|
|
/**
|
|
* \brief GCM buffer encryption/decryption using a block cipher
|
|
*
|
|
* \note On encryption, the output buffer can be the same as the input buffer.
|
|
* On decryption, the output buffer cannot be the same as input buffer.
|
|
* If buffers overlap, the output buffer must trail at least 8 bytes
|
|
* behind the input buffer.
|
|
*
|
|
* \param ctx GCM context
|
|
* \param mode MBEDTLS_GCM_ENCRYPT or MBEDTLS_GCM_DECRYPT
|
|
* \param length length of the input data
|
|
* \param iv initialization vector
|
|
* \param iv_len length of IV
|
|
* \param add additional data
|
|
* \param add_len length of additional data
|
|
* \param input buffer holding the input data
|
|
* \param output buffer for holding the output data
|
|
* \param tag_len length of the tag to generate
|
|
* \param tag buffer for holding the tag
|
|
*
|
|
* \return 0 if successful
|
|
*/
|
|
int mbedtls_gcm_crypt_and_tag( mbedtls_gcm_context *ctx,
|
|
int mode,
|
|
size_t length,
|
|
const unsigned char *iv,
|
|
size_t iv_len,
|
|
const unsigned char *add,
|
|
size_t add_len,
|
|
const unsigned char *input,
|
|
unsigned char *output,
|
|
size_t tag_len,
|
|
unsigned char *tag );
|
|
|
|
/**
|
|
* \brief GCM buffer authenticated decryption using a block cipher
|
|
*
|
|
* \note On decryption, the output buffer cannot be the same as input buffer.
|
|
* If buffers overlap, the output buffer must trail at least 8 bytes
|
|
* behind the input buffer.
|
|
*
|
|
* \param ctx GCM context
|
|
* \param length length of the input data
|
|
* \param iv initialization vector
|
|
* \param iv_len length of IV
|
|
* \param add additional data
|
|
* \param add_len length of additional data
|
|
* \param tag buffer holding the tag
|
|
* \param tag_len length of the tag
|
|
* \param input buffer holding the input data
|
|
* \param output buffer for holding the output data
|
|
*
|
|
* \return 0 if successful and authenticated,
|
|
* MBEDTLS_ERR_GCM_AUTH_FAILED if tag does not match
|
|
*/
|
|
int mbedtls_gcm_auth_decrypt( mbedtls_gcm_context *ctx,
|
|
size_t length,
|
|
const unsigned char *iv,
|
|
size_t iv_len,
|
|
const unsigned char *add,
|
|
size_t add_len,
|
|
const unsigned char *tag,
|
|
size_t tag_len,
|
|
const unsigned char *input,
|
|
unsigned char *output );
|
|
|
|
/**
|
|
* \brief Generic GCM stream start function
|
|
*
|
|
* \param ctx GCM context
|
|
* \param mode MBEDTLS_GCM_ENCRYPT or MBEDTLS_GCM_DECRYPT
|
|
* \param iv initialization vector
|
|
* \param iv_len length of IV
|
|
* \param add additional data (or NULL if length is 0)
|
|
* \param add_len length of additional data
|
|
*
|
|
* \return 0 if successful
|
|
*/
|
|
int mbedtls_gcm_starts( mbedtls_gcm_context *ctx,
|
|
int mode,
|
|
const unsigned char *iv,
|
|
size_t iv_len,
|
|
const unsigned char *add,
|
|
size_t add_len );
|
|
|
|
/**
|
|
* \brief Generic GCM update function. Encrypts/decrypts using the
|
|
* given GCM context. Expects input to be a multiple of 16
|
|
* bytes! Only the last call before mbedtls_gcm_finish() can be less
|
|
* than 16 bytes!
|
|
*
|
|
* \note On decryption, the output buffer cannot be the same as input buffer.
|
|
* If buffers overlap, the output buffer must trail at least 8 bytes
|
|
* behind the input buffer.
|
|
*
|
|
* \param ctx GCM context
|
|
* \param length length of the input data
|
|
* \param input buffer holding the input data
|
|
* \param output buffer for holding the output data
|
|
*
|
|
* \return 0 if successful or MBEDTLS_ERR_GCM_BAD_INPUT
|
|
*/
|
|
int mbedtls_gcm_update( mbedtls_gcm_context *ctx,
|
|
size_t length,
|
|
const unsigned char *input,
|
|
unsigned char *output );
|
|
|
|
/**
|
|
* \brief Generic GCM finalisation function. Wraps up the GCM stream
|
|
* and generates the tag. The tag can have a maximum length of
|
|
* 16 bytes.
|
|
*
|
|
* \param ctx GCM context
|
|
* \param tag buffer for holding the tag
|
|
* \param tag_len length of the tag to generate (must be at least 4)
|
|
*
|
|
* \return 0 if successful or MBEDTLS_ERR_GCM_BAD_INPUT
|
|
*/
|
|
int mbedtls_gcm_finish( mbedtls_gcm_context *ctx,
|
|
unsigned char *tag,
|
|
size_t tag_len );
|
|
|
|
/**
|
|
* \brief Free a GCM context and underlying cipher sub-context
|
|
*
|
|
* \param ctx GCM context to free
|
|
*/
|
|
void mbedtls_gcm_free( mbedtls_gcm_context *ctx );
|
|
|
|
/**
|
|
* \brief Checkup routine
|
|
*
|
|
* \return 0 if successful, or 1 if the test failed
|
|
*/
|
|
int mbedtls_gcm_self_test( int verbose );
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* gcm.h */
|