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/*
* Copyright (c) 2026 Egor Tensin <Egor.Tensin@gmail.com>
* This file is part of the "AES tools" project.
* For details, see https://github.com/egor-tensin/aes-tools.
* Distributed under the MIT License.
*/
#include <aes/all.h>
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
static AES_StatusCode aes_parse_key_aes128(
AES_Key* dest,
const char* src,
AES_ErrorDetails* err_details
) {
if (dest == NULL)
return aes_error_null_argument(err_details, "dest");
return aes128_parse_key(&dest->aes128_key, src, err_details);
}
static AES_StatusCode aes_parse_key_aes192(
AES_Key* dest,
const char* src,
AES_ErrorDetails* err_details
) {
if (dest == NULL)
return aes_error_null_argument(err_details, "dest");
return aes192_parse_key(&dest->aes192_key, src, err_details);
}
static AES_StatusCode aes_parse_key_aes256(
AES_Key* dest,
const char* src,
AES_ErrorDetails* err_details
) {
if (dest == NULL)
return aes_error_null_argument(err_details, "dest");
return aes256_parse_key(&dest->aes256_key, src, err_details);
}
static AES_StatusCode aes_format_key_aes128(
AES_KeyString* dest,
const AES_Key* src,
AES_ErrorDetails* err_details
) {
if (dest == NULL)
return aes_error_null_argument(err_details, "dest");
if (src == NULL)
return aes_error_null_argument(err_details, "src");
return aes128_format_key(&dest->aes128, &src->aes128_key, err_details);
}
static AES_StatusCode aes_format_key_aes192(
AES_KeyString* dest,
const AES_Key* src,
AES_ErrorDetails* err_details
) {
if (dest == NULL)
return aes_error_null_argument(err_details, "dest");
if (src == NULL)
return aes_error_null_argument(err_details, "src");
return aes192_format_key(&dest->aes192, &src->aes192_key, err_details);
}
static AES_StatusCode aes_format_key_aes256(
AES_KeyString* dest,
const AES_Key* src,
AES_ErrorDetails* err_details
) {
if (dest == NULL)
return aes_error_null_argument(err_details, "dest");
if (src == NULL)
return aes_error_null_argument(err_details, "src");
return aes256_format_key(&dest->aes256, &src->aes256_key, err_details);
}
static AES_StatusCode check_expand_key_params(
const AES_Key* key,
AES_EncryptionRoundKeys* encryption_keys,
AES_DecryptionRoundKeys* decryption_keys,
AES_ErrorDetails* err_details
) {
if (key == NULL)
return aes_error_null_argument(err_details, "key");
if (encryption_keys == NULL)
return aes_error_null_argument(err_details, "encryption_keys");
if (decryption_keys == NULL)
return aes_error_null_argument(err_details, "decryption_keys");
return AES_SUCCESS;
}
static AES_StatusCode aes_expand_key_aes128(
const AES_Key* key,
AES_EncryptionRoundKeys* encryption_keys,
AES_DecryptionRoundKeys* decryption_keys,
AES_ErrorDetails* err_details
) {
AES_StatusCode status =
check_expand_key_params(key, encryption_keys, decryption_keys, err_details);
if (aes_is_error(status))
return status;
aes128_expand_key(&key->aes128_key, &encryption_keys->aes128_enc_keys);
aes128_derive_decryption_keys(
&encryption_keys->aes128_enc_keys, &decryption_keys->aes128_dec_keys
);
return status;
}
static AES_StatusCode aes_expand_key_aes192(
const AES_Key* key,
AES_EncryptionRoundKeys* encryption_keys,
AES_DecryptionRoundKeys* decryption_keys,
AES_ErrorDetails* err_details
) {
AES_StatusCode status =
check_expand_key_params(key, encryption_keys, decryption_keys, err_details);
if (aes_is_error(status))
return status;
aes192_expand_key(&key->aes192_key, &encryption_keys->aes192_enc_keys);
aes192_derive_decryption_keys(
&encryption_keys->aes192_enc_keys, &decryption_keys->aes192_dec_keys
);
return status;
}
static AES_StatusCode aes_expand_key_aes256(
const AES_Key* key,
AES_EncryptionRoundKeys* encryption_keys,
AES_DecryptionRoundKeys* decryption_keys,
AES_ErrorDetails* err_details
) {
AES_StatusCode status =
check_expand_key_params(key, encryption_keys, decryption_keys, err_details);
if (aes_is_error(status))
return status;
aes256_expand_key(&key->aes256_key, &encryption_keys->aes256_enc_keys);
aes256_derive_decryption_keys(
&encryption_keys->aes256_enc_keys, &decryption_keys->aes256_dec_keys
);
return status;
}
static AES_StatusCode check_encrypt_params(
const AES_Block* input,
const AES_EncryptionRoundKeys* params,
AES_Block* output,
AES_ErrorDetails* err_details
) {
if (input == NULL)
return aes_error_null_argument(err_details, "input");
if (params == NULL)
return aes_error_null_argument(err_details, "params");
if (output == NULL)
return aes_error_null_argument(err_details, "output");
return AES_SUCCESS;
}
static AES_StatusCode check_decrypt_params(
const AES_Block* input,
const AES_DecryptionRoundKeys* params,
AES_Block* output,
AES_ErrorDetails* err_details
) {
if (input == NULL)
return aes_error_null_argument(err_details, "input");
if (params == NULL)
return aes_error_null_argument(err_details, "params");
if (output == NULL)
return aes_error_null_argument(err_details, "output");
return AES_SUCCESS;
}
static AES_StatusCode aes_encrypt_block_aes128(
const AES_Block* input,
const AES_EncryptionRoundKeys* params,
AES_Block* output,
AES_ErrorDetails* err_details
) {
AES_StatusCode status = check_encrypt_params(input, params, output, err_details);
if (aes_is_error(status))
return status;
*output = aes128_encrypt_block(*input, ¶ms->aes128_enc_keys);
return status;
}
static AES_StatusCode aes_decrypt_block_aes128(
const AES_Block* input,
const AES_DecryptionRoundKeys* params,
AES_Block* output,
AES_ErrorDetails* err_details
) {
AES_StatusCode status = check_decrypt_params(input, params, output, err_details);
if (aes_is_error(status))
return status;
*output = aes128_decrypt_block(*input, ¶ms->aes128_dec_keys);
return status;
}
static AES_StatusCode aes_encrypt_block_aes192(
const AES_Block* input,
const AES_EncryptionRoundKeys* params,
AES_Block* output,
AES_ErrorDetails* err_details
) {
AES_StatusCode status = check_encrypt_params(input, params, output, err_details);
if (aes_is_error(status))
return status;
*output = aes192_encrypt_block(*input, ¶ms->aes192_enc_keys);
return status;
}
static AES_StatusCode aes_decrypt_block_aes192(
const AES_Block* input,
const AES_DecryptionRoundKeys* params,
AES_Block* output,
AES_ErrorDetails* err_details
) {
AES_StatusCode status = check_decrypt_params(input, params, output, err_details);
if (aes_is_error(status))
return status;
*output = aes192_decrypt_block(*input, ¶ms->aes192_dec_keys);
return status;
}
static AES_StatusCode aes_encrypt_block_aes256(
const AES_Block* input,
const AES_EncryptionRoundKeys* params,
AES_Block* output,
AES_ErrorDetails* err_details
) {
AES_StatusCode status = check_encrypt_params(input, params, output, err_details);
if (aes_is_error(status))
return status;
*output = aes256_encrypt_block(*input, ¶ms->aes256_enc_keys);
return status;
}
static AES_StatusCode aes_decrypt_block_aes256(
const AES_Block* input,
const AES_DecryptionRoundKeys* params,
AES_Block* output,
AES_ErrorDetails* err_details
) {
AES_StatusCode status = check_decrypt_params(input, params, output, err_details);
if (aes_is_error(status))
return status;
*output = aes256_decrypt_block(*input, ¶ms->aes256_dec_keys);
return status;
}
static AES_Ops aes128_ops = {
&aes_parse_key_aes128,
&aes_format_key_aes128,
&aes_expand_key_aes128,
&aes_encrypt_block_aes128,
&aes_decrypt_block_aes128,
};
static AES_Ops aes192_ops = {
&aes_parse_key_aes192,
&aes_format_key_aes192,
&aes_expand_key_aes192,
&aes_encrypt_block_aes192,
&aes_decrypt_block_aes192,
};
static AES_Ops aes256_ops = {
&aes_parse_key_aes256,
&aes_format_key_aes256,
&aes_expand_key_aes256,
&aes_encrypt_block_aes256,
&aes_decrypt_block_aes256,
};
static const AES_Ops* aes_ops_list[] = {
&aes128_ops,
&aes192_ops,
&aes256_ops,
};
const AES_Ops* aes_get_ops(AES_Algorithm algorithm) {
int l = 0;
size_t r = sizeof(aes_ops_list) / sizeof(aes_ops_list[0]) - 1;
if ((int)algorithm < l || (size_t)algorithm > r) {
assert(0);
return NULL;
}
return aes_ops_list[algorithm];
}
AES_StatusCode aes_parse_key(
AES_Algorithm algorithm,
AES_Key* dest,
const char* src,
AES_ErrorDetails* err_details
) {
if (dest == NULL)
return aes_error_null_argument(err_details, "dest");
if (src == NULL)
return aes_error_null_argument(err_details, "src");
return aes_get_ops(algorithm)->parse_key(dest, src, err_details);
}
AES_StatusCode aes_format_key(
AES_Algorithm algorithm,
AES_KeyString* dest,
const AES_Key* src,
AES_ErrorDetails* err_details
) {
if (dest == NULL)
return aes_error_null_argument(err_details, "dest");
if (src == NULL)
return aes_error_null_argument(err_details, "src");
return aes_get_ops(algorithm)->format_key(dest, src, err_details);
}
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