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/** @file
AES Wrapper Implementation over MbedTLS.
Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "InternalCryptLib.h"
#include <mbedtls/aes.h>
/**
Retrieves the size, in bytes, of the context buffer required for AES operations.
@return The size, in bytes, of the context buffer required for AES operations.
**/
UINTN
EFIAPI
AesGetContextSize (
VOID
)
{
//
// AES uses different key contexts for encryption and decryption, so here memory
// for 2 copies of mbedtls_aes_context is allocated.
//
return (UINTN)(2 * sizeof (mbedtls_aes_context));
}
/**
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.
@param[out] AesContext Pointer to AES context being initialized.
@param[in] Key Pointer to the user-supplied AES key.
@param[in] KeyLength Length of AES key in bits.
@retval TRUE AES context initialization succeeded.
@retval FALSE AES context initialization failed.
**/
BOOLEAN
EFIAPI
AesInit (
OUT VOID *AesContext,
IN CONST UINT8 *Key,
IN UINTN KeyLength
)
{
mbedtls_aes_context *AesCtx;
//
// Check input parameters.
//
if ((AesContext == NULL) || (Key == NULL) || ((KeyLength != 128) && (KeyLength != 192) && (KeyLength != 256))) {
return FALSE;
}
//
// Initialize AES encryption & decryption key schedule.
//
AesCtx = (mbedtls_aes_context *)AesContext;
if (mbedtls_aes_setkey_enc (AesCtx, Key, (UINT32)KeyLength) != 0) {
return FALSE;
}
if (mbedtls_aes_setkey_dec (AesCtx + 1, Key, (UINT32)KeyLength) != 0) {
return FALSE;
}
return TRUE;
}
/**
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.
@param[in] AesContext Pointer to the AES context.
@param[in] Input Pointer to the buffer containing the data to be encrypted.
@param[in] InputSize Size of the Input buffer in bytes.
@param[in] Ivec Pointer to initialization vector.
@param[out] Output Pointer to a buffer that receives the AES encryption output.
@retval TRUE AES encryption succeeded.
@retval FALSE AES encryption failed.
**/
BOOLEAN
EFIAPI
AesCbcEncrypt (
IN VOID *AesContext,
IN CONST UINT8 *Input,
IN UINTN InputSize,
IN CONST UINT8 *Ivec,
OUT UINT8 *Output
)
{
mbedtls_aes_context *AesCtx;
UINT8 IvecBuffer[AES_BLOCK_SIZE];
//
// Check input parameters.
//
if ((AesContext == NULL) || (Input == NULL) || ((InputSize % AES_BLOCK_SIZE) != 0)) {
return FALSE;
}
if ((Ivec == NULL) || (Output == NULL) || (InputSize > INT_MAX)) {
return FALSE;
}
AesCtx = (mbedtls_aes_context *)AesContext;
CopyMem (IvecBuffer, Ivec, AES_BLOCK_SIZE);
//
// Perform AES data encryption with CBC mode
//
if (mbedtls_aes_crypt_cbc (
AesCtx,
MBEDTLS_AES_ENCRYPT,
(UINT32)InputSize,
IvecBuffer,
Input,
Output
) != 0)
{
return FALSE;
} else {
return TRUE;
}
}
/**
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.
@param[in] AesContext Pointer to the AES context.
@param[in] Input Pointer to the buffer containing the data to be encrypted.
@param[in] InputSize Size of the Input buffer in bytes.
@param[in] Ivec Pointer to initialization vector.
@param[out] Output Pointer to a buffer that receives the AES encryption output.
@retval TRUE AES decryption succeeded.
@retval FALSE AES decryption failed.
**/
BOOLEAN
EFIAPI
AesCbcDecrypt (
IN VOID *AesContext,
IN CONST UINT8 *Input,
IN UINTN InputSize,
IN CONST UINT8 *Ivec,
OUT UINT8 *Output
)
{
mbedtls_aes_context *AesCtx;
UINT8 IvecBuffer[AES_BLOCK_SIZE];
//
// Check input parameters.
//
if ((AesContext == NULL) || (Input == NULL) || ((InputSize % AES_BLOCK_SIZE) != 0)) {
return FALSE;
}
if ((Ivec == NULL) || (Output == NULL) || (InputSize > INT_MAX)) {
return FALSE;
}
AesCtx = (mbedtls_aes_context *)AesContext;
CopyMem (IvecBuffer, Ivec, AES_BLOCK_SIZE);
//
// Perform AES data encryption with CBC mode
//
if (mbedtls_aes_crypt_cbc (
AesCtx + 1,
MBEDTLS_AES_DECRYPT,
(UINT32)InputSize,
IvecBuffer,
Input,
Output
) != 0)
{
return FALSE;
} else {
return TRUE;
}
}
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