CryptAes.c File Reference

#include "InternalCryptLib.h"
#include <mbedtls/aes.h>

Go to the source code of this file.

Functions
UINTN EFIAPI	AesGetContextSize (VOID)
BOOLEAN EFIAPI	AesInit (OUT VOID *AesContext, IN CONST UINT8 *Key, IN UINTN KeyLength)
BOOLEAN EFIAPI	AesCbcEncrypt (IN VOID *AesContext, IN CONST UINT8 *Input, IN UINTN InputSize, IN CONST UINT8 *Ivec, OUT UINT8 *Output)
BOOLEAN EFIAPI	AesCbcDecrypt (IN VOID *AesContext, IN CONST UINT8 *Input, IN UINTN InputSize, IN CONST UINT8 *Ivec, OUT UINT8 *Output)

Detailed Description

AES Wrapper Implementation over MbedTLS.

Copyright (c) 2023, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file CryptAes.c.

Function Documentation

AesCbcDecrypt()

BOOLEAN EFIAPI AesCbcDecrypt	(	IN VOID *	AesContext,
		IN CONST UINT8 *	Input,
		IN UINTN	InputSize,
		IN CONST UINT8 *	Ivec,
		OUT UINT8 *	Output
	)

Performs AES decryption on a data buffer of the specified size in CBC mode.

This function performs AES decryption on data buffer pointed by Input, of specified size of InputSize, in CBC mode. InputSize must be multiple of block size (16 bytes). This function does not perform padding. Caller must perform padding, if necessary, to ensure valid input data size. Initialization vector should be one block size (16 bytes). AesContext should be already correctly initialized by AesInit(). Behavior with invalid AES context is undefined.

If AesContext is NULL, then return FALSE. If Input is NULL, then return FALSE. If InputSize is not multiple of block size (16 bytes), then return FALSE. If Ivec is NULL, then return FALSE. If Output is NULL, then return FALSE.

Parameters

[in]	AesContext	Pointer to the AES context.
[in]	Input	Pointer to the buffer containing the data to be encrypted.
[in]	InputSize	Size of the Input buffer in bytes.
[in]	Ivec	Pointer to initialization vector.
[out]	Output	Pointer to a buffer that receives the AES encryption output.

Return values

TRUE	AES decryption succeeded.
FALSE	AES decryption failed.

Definition at line 184 of file CryptAes.c.

AesCbcEncrypt()

BOOLEAN EFIAPI AesCbcEncrypt	(	IN VOID *	AesContext,
		IN CONST UINT8 *	Input,
		IN UINTN	InputSize,
		IN CONST UINT8 *	Ivec,
		OUT UINT8 *	Output
	)

Performs AES encryption on a data buffer of the specified size in CBC mode.

This function performs AES encryption on data buffer pointed by Input, of specified size of InputSize, in CBC mode. InputSize must be multiple of block size (16 bytes). This function does not perform padding. Caller must perform padding, if necessary, to ensure valid input data size. Initialization vector should be one block size (16 bytes). AesContext should be already correctly initialized by AesInit(). Behavior with invalid AES context is undefined.

If AesContext is NULL, then return FALSE. If Input is NULL, then return FALSE. If InputSize is not multiple of block size (16 bytes), then return FALSE. If Ivec is NULL, then return FALSE. If Output is NULL, then return FALSE.

Parameters

[in]	AesContext	Pointer to the AES context.
[in]	Input	Pointer to the buffer containing the data to be encrypted.
[in]	InputSize	Size of the Input buffer in bytes.
[in]	Ivec	Pointer to initialization vector.
[out]	Output	Pointer to a buffer that receives the AES encryption output.

Return values

TRUE	AES encryption succeeded.
FALSE	AES encryption failed.

Definition at line 112 of file CryptAes.c.

AesGetContextSize()

UINTN EFIAPI AesGetContextSize

(

VOID

)

Retrieves the size, in bytes, of the context buffer required for AES operations.

Returns

The size, in bytes, of the context buffer required for AES operations.

Definition at line 20 of file CryptAes.c.

AesInit()

BOOLEAN EFIAPI AesInit	(	OUT VOID *	AesContext,
		IN CONST UINT8 *	Key,
		IN UINTN	KeyLength
	)

Initializes user-supplied memory as AES context for subsequent use.

This function initializes user-supplied memory pointed by AesContext as AES context. In addition, it sets up all AES key materials for subsequent encryption and decryption operations. There are 3 options for key length, 128 bits, 192 bits, and 256 bits.

If AesContext is NULL, then return FALSE. If Key is NULL, then return FALSE. If KeyLength is not valid, then return FALSE.

Parameters

[out]	AesContext	Pointer to AES context being initialized.
[in]	Key	Pointer to the user-supplied AES key.
[in]	KeyLength	Length of AES key in bits.

Return values

TRUE	AES context initialization succeeded.
FALSE	AES context initialization failed.

Definition at line 53 of file CryptAes.c.