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/** @file
ARC4 Wrapper Implementation over OpenSSL.
Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "InternalCryptLib.h"
#include <openssl/rc4.h>
/**
Retrieves the size, in bytes, of the context buffer required for ARC4 operations.
@return The size, in bytes, of the context buffer required for ARC4 operations.
**/
UINTN
EFIAPI
Arc4GetContextSize (
VOID
)
{
//
// Memory for 2 copies of RC4_KEY is allocated, one for working copy, and the other
// for backup copy. When Arc4Reset() is called, we can use the backup copy to restore
// the working copy to the initial state.
//
return (UINTN) (2 * sizeof(RC4_KEY));
}
/**
Initializes user-supplied memory as ARC4 context for subsequent use.
This function initializes user-supplied memory pointed by Arc4Context as ARC4 context.
In addtion, it sets up all ARC4 key materials for subsequent encryption and decryption
operations.
If Arc4Context is NULL, then ASSERT().
If Key is NULL, then ASSERT().
If KeySize does not in the range of [5, 256] bytes, then ASSERT().
@param[out] Arc4Context Pointer to ARC4 context being initialized.
@param[in] Key Pointer to the user-supplied ARC4 key.
@param[in] KeySize Size of ARC4 key in bytes.
@retval TRUE ARC4 context initialization succeeded.
@retval FALSE ARC4 context initialization failed.
**/
BOOLEAN
EFIAPI
Arc4Init (
OUT VOID *Arc4Context,
IN CONST UINT8 *Key,
IN UINTN KeySize
)
{
RC4_KEY *Rc4Key;
ASSERT (Arc4Context != NULL);
ASSERT (Key != NULL);
ASSERT ((KeySize >= 5) && (KeySize <= 256));
Rc4Key = (RC4_KEY *) Arc4Context;
RC4_set_key (Rc4Key, (UINT32) KeySize, Key);
CopyMem (Rc4Key + 1, Rc4Key, sizeof(RC4_KEY));
return TRUE;
}
/**
Performs ARC4 encryption on a data buffer of the specified size.
This function performs ARC4 encryption on data buffer pointed by Input, of specified
size of InputSize.
Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
invalid ARC4 context is undefined.
If Arc4Context is NULL, then ASSERT().
If Input is NULL, then ASSERT().
If Output is NULL, then ASSERT().
@param[in, out] Arc4Context Pointer to the ARC4 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[out] Output Pointer to a buffer that receives the ARC4 encryption output.
@retval TRUE ARC4 encryption succeeded.
@retval FALSE ARC4 encryption failed.
**/
BOOLEAN
EFIAPI
Arc4Encrypt (
IN OUT VOID *Arc4Context,
IN CONST UINT8 *Input,
IN UINTN InputSize,
OUT UINT8 *Output
)
{
RC4_KEY *Rc4Key;
ASSERT (Arc4Context != NULL);
ASSERT (Input != NULL);
ASSERT (Output != NULL);
Rc4Key = (RC4_KEY *) Arc4Context;
RC4 (Rc4Key, (UINT32) InputSize, Input, Output);
return TRUE;
}
/**
Performs ARC4 decryption on a data buffer of the specified size.
This function performs ARC4 decryption on data buffer pointed by Input, of specified
size of InputSize.
Arc4Context should be already correctly initialized by Arc4Init(). Behavior with
invalid ARC4 context is undefined.
If Arc4Context is NULL, then ASSERT().
If Input is NULL, then ASSERT().
If Output is NULL, then ASSERT().
@param[in, out] Arc4Context Pointer to the ARC4 context.
@param[in] Input Pointer to the buffer containing the data to be decrypted.
@param[in] InputSize Size of the Input buffer in bytes.
@param[out] Output Pointer to a buffer that receives the ARC4 decryption output.
@retval TRUE ARC4 decryption succeeded.
@retval FALSE ARC4 decryption failed.
**/
BOOLEAN
EFIAPI
Arc4Decrypt (
IN OUT VOID *Arc4Context,
IN UINT8 *Input,
IN UINTN InputSize,
OUT UINT8 *Output
)
{
RC4_KEY *Rc4Key;
ASSERT (Arc4Context != NULL);
ASSERT (Input != NULL);
ASSERT (Output != NULL);
Rc4Key = (RC4_KEY *) Arc4Context;
RC4 (Rc4Key, (UINT32) InputSize, Input, Output);
return TRUE;
}
/**
Resets the ARC4 context to the initial state.
The function resets the ARC4 context to the state it had immediately after the
ARC4Init() function call.
Contrary to ARC4Init(), Arc4Reset() requires no secret key as input, but ARC4 context
should be already correctly initialized by ARC4Init().
If Arc4Context is NULL, then ASSERT().
@param[in, out] Arc4Context Pointer to the ARC4 context.
@retval TRUE ARC4 reset succeeded.
@retval FALSE ARC4 reset failed.
**/
BOOLEAN
EFIAPI
Arc4Reset (
IN OUT VOID *Arc4Context
)
{
RC4_KEY *Rc4Key;
ASSERT (Arc4Context != NULL);
Rc4Key = (RC4_KEY *) Arc4Context;
CopyMem (Rc4Key, Rc4Key + 1, sizeof(RC4_KEY));
return TRUE;
}
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