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/**
* \file
* \author Egor Tensin <Egor.Tensin@gmail.com>
* \date 2015
* \copyright This file is licensed under the terms of the MIT License.
* See LICENSE.txt for details.
*/
#include <aesni/all.h>
#include <stdlib.h>
#include <string.h>
static AesNI_StatusCode aesni_extract_padding_size_pkcs7(
const void* src,
size_t src_size,
size_t* padding_size,
AesNI_ErrorDetails* err_details)
{
const unsigned char* cursor = (const unsigned char*) src + src_size - 1;
*padding_size = *cursor;
for (size_t i = 1; i < *padding_size; ++i)
if (cursor[0 - i] != *padding_size)
return aesni_error_invalid_pkcs7_padding(err_details);
return AESNI_SUCCESS;
}
AesNI_StatusCode aesni_extract_padding_size(
AesNI_PaddingMethod method,
const void* src,
size_t src_size,
size_t* padding_size,
AesNI_ErrorDetails* err_details)
{
assert(src);
assert(padding_size);
if (src == NULL)
return aesni_error_null_argument(err_details, "src");
if (padding_size == NULL)
return aesni_error_null_argument(err_details, "padding_size");
switch (method)
{
case AESNI_PADDING_PKCS7:
return aesni_extract_padding_size_pkcs7(
src, src_size, padding_size, err_details);
default:
return aesni_error_not_implemented(
err_details, "unsupported padding method");
}
}
static AesNI_StatusCode aesni_fill_with_padding_pkcs7(
void* dest,
size_t padding_size,
AesNI_ErrorDetails* err_details)
{
memset(dest, padding_size, padding_size);
return AESNI_SUCCESS;
}
AesNI_StatusCode aesni_fill_with_padding(
AesNI_PaddingMethod method,
void* dest,
size_t padding_size,
AesNI_ErrorDetails* err_details)
{
assert(dest);
if (dest == NULL)
return aesni_error_null_argument(err_details, "dest");
switch (method)
{
case AESNI_PADDING_PKCS7:
return aesni_fill_with_padding_pkcs7(
dest, padding_size, err_details);
default:
return aesni_error_not_implemented(
err_details, "unsupported padding method");
}
}
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