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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>
static const AesNI_BoxAlgorithmInterface* aesni_box_algorithm_ifaces[] =
{
&aesni_box_aes128_iface,
&aesni_box_aes192_iface,
&aesni_box_aes256_iface,
};
AesNI_StatusCode aesni_box_init(
AesNI_Box* box,
AesNI_BoxAlgorithm algorithm,
const AesNI_BoxAlgorithmParams* algorithm_params,
AesNI_BoxMode mode,
const AesNI_BoxBlock* iv,
AesNI_ErrorDetails* err_details)
{
AesNI_StatusCode status = AESNI_SUCCESS;
box->algorithm_iface = aesni_box_algorithm_ifaces[algorithm];
if (aesni_is_error(status = box->algorithm_iface->derive_params(
algorithm_params,
&box->encrypt_params,
&box->decrypt_params,
err_details)))
return status;
box->mode = mode;
if (iv != NULL)
box->iv = *iv;
return status;
}
static AesNI_StatusCode aesni_box_encrypt_ecb(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
return box->algorithm_iface->encrypt(
input,
&box->encrypt_params,
output,
err_details);
}
static AesNI_StatusCode aesni_box_encrypt_cbc(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
AesNI_StatusCode status = AESNI_SUCCESS;
AesNI_BoxBlock xored_input = *input;
status = box->algorithm_iface->xor_block(
&xored_input,
&box->iv,
err_details);
if (aesni_is_error(status))
return status;
status = box->algorithm_iface->encrypt(
&xored_input,
&box->encrypt_params,
output,
err_details);
if (aesni_is_error(status))
return status;
box->iv = *output;
return status;
}
static AesNI_StatusCode aesni_box_encrypt_cfb(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
AesNI_StatusCode status = box->algorithm_iface->encrypt(
&box->iv,
&box->encrypt_params,
output,
err_details);
if (aesni_is_error(status))
return status;
status = box->algorithm_iface->xor_block(output, input, err_details);
if (aesni_is_error(status))
return status;
box->iv = *output;
return status;
}
static AesNI_StatusCode aesni_box_encrypt_ofb(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
AesNI_StatusCode status = box->algorithm_iface->encrypt(
&box->iv,
&box->encrypt_params,
&box->iv,
err_details);
if (aesni_is_error(status))
return status;
*output = box->iv;
status = box->algorithm_iface->xor_block(output, input, err_details);
if (aesni_is_error(status))
return status;
return status;
}
static AesNI_StatusCode aesni_box_encrypt_ctr(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
return aesni_error_not_implemented(err_details, "box encryption in CTR mode");
}
typedef AesNI_StatusCode (*AesNI_BoxEncryptMode)(
AesNI_Box*,
const AesNI_BoxBlock*,
AesNI_BoxBlock*,
AesNI_ErrorDetails*);
static AesNI_BoxEncryptMode aesni_box_encrypt_mode[] =
{
&aesni_box_encrypt_ecb,
&aesni_box_encrypt_cbc,
&aesni_box_encrypt_cfb,
&aesni_box_encrypt_ofb,
&aesni_box_encrypt_ctr,
};
AesNI_StatusCode aesni_box_encrypt(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
return aesni_box_encrypt_mode[box->mode](box, input, output, err_details);
}
static AesNI_StatusCode aesni_box_decrypt_ecb(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
return box->algorithm_iface->decrypt(
input,
&box->decrypt_params,
output,
err_details);
}
static AesNI_StatusCode aesni_box_decrypt_cbc(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
AesNI_StatusCode status = box->algorithm_iface->decrypt(
input,
&box->decrypt_params,
output,
err_details);
if (aesni_is_error(status))
return status;
status = box->algorithm_iface->xor_block(
output,
&box->iv,
err_details);
if (aesni_is_error(status))
return status;
box->iv = *input;
return status;
}
static AesNI_StatusCode aesni_box_decrypt_cfb(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
AesNI_StatusCode status = box->algorithm_iface->encrypt(
&box->iv,
&box->encrypt_params,
output,
err_details);
if (aesni_is_error(status))
return status;
status = box->algorithm_iface->xor_block(
output,
input,
err_details);
if (aesni_is_error(status))
return status;
box->iv = *input;
return status;
}
static AesNI_StatusCode aesni_box_decrypt_ofb(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
AesNI_StatusCode status = box->algorithm_iface->encrypt(
&box->iv,
&box->encrypt_params,
output,
err_details);
if (aesni_is_error(status))
return status;
box->iv = *output;
status = box->algorithm_iface->xor_block(
output,
input,
err_details);
if (aesni_is_error(status))
return status;
return status;
}
static AesNI_StatusCode aesni_box_decrypt_ctr(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
return aesni_error_not_implemented(err_details, "box decryption in CTR mode");
}
typedef AesNI_BoxEncryptMode AesNI_BoxDecryptMode;
static AesNI_BoxDecryptMode aesni_box_decrypt_mode[] =
{
&aesni_box_decrypt_ecb,
&aesni_box_decrypt_cbc,
&aesni_box_decrypt_cfb,
&aesni_box_decrypt_ofb,
&aesni_box_decrypt_ctr,
};
AesNI_StatusCode aesni_box_decrypt(
AesNI_Box* box,
const AesNI_BoxBlock* input,
AesNI_BoxBlock* output,
AesNI_ErrorDetails* err_details)
{
return aesni_box_decrypt_mode[box->mode](box, input, output, err_details);
}
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