rewrite: the beginning

This a giant fuck-you to myself while I have nothing (actually, tons of
things) to do in a hospital.

* The giant screens of preprocessor code are gone, they always sucked,
  fuck them.
* Switched everything to the "boxes" interface as the only one
  remaining.
* Restuctured things in aes/ so that the files they're in make at least
  a little bit of sense.
* Removed a bunch of cruft and prematurely generic code.
* This is half-baked at best: I just made sure that the tests pass. A
  lot of cleanup awaits.

1 files changed, 264 insertions, 0 deletions

diff --git a/aes/src/algorithm.c b/aes/src/algorithm.c
new file mode 100644
index 0000000..2c3e056
--- /dev/null
+++ b/aes/src/algorithm.c
@@ -0,0 +1,264 @@
+/*
+ * 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 aes_expand_key_aes128(
+    const AES_Key* key,
+    AES_EncryptionRoundKeys* encryption_keys,
+    AES_DecryptionRoundKeys* decryption_keys,
+    AES_ErrorDetails* err_details
+) {
+    AES_UNUSED_PARAMETER(err_details);
+    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 AES_SUCCESS;
+}
+
+static AES_StatusCode aes_expand_key_aes192(
+    const AES_Key* key,
+    AES_EncryptionRoundKeys* encryption_keys,
+    AES_DecryptionRoundKeys* decryption_keys,
+    AES_ErrorDetails* err_details
+) {
+    AES_UNUSED_PARAMETER(err_details);
+    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 AES_SUCCESS;
+}
+
+static AES_StatusCode aes_expand_key_aes256(
+    const AES_Key* key,
+    AES_EncryptionRoundKeys* encryption_keys,
+    AES_DecryptionRoundKeys* decryption_keys,
+    AES_ErrorDetails* err_details
+) {
+    AES_UNUSED_PARAMETER(err_details);
+    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 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_UNUSED_PARAMETER(err_details);
+    *output = aes128_encrypt_block(*input, &params->aes128_enc_keys);
+    return AES_SUCCESS;
+}
+
+static AES_StatusCode aes_decrypt_block_aes128(
+    const AES_Block* input,
+    const AES_DecryptionRoundKeys* params,
+    AES_Block* output,
+    AES_ErrorDetails* err_details
+) {
+    AES_UNUSED_PARAMETER(err_details);
+    *output = aes128_decrypt_block(*input, &params->aes128_dec_keys);
+    return AES_SUCCESS;
+}
+
+static AES_StatusCode aes_encrypt_block_aes192(
+    const AES_Block* input,
+    const AES_EncryptionRoundKeys* params,
+    AES_Block* output,
+    AES_ErrorDetails* err_details
+) {
+    AES_UNUSED_PARAMETER(err_details);
+    *output = aes192_encrypt_block(*input, &params->aes192_enc_keys);
+    return AES_SUCCESS;
+}
+
+static AES_StatusCode aes_decrypt_block_aes192(
+    const AES_Block* input,
+    const AES_DecryptionRoundKeys* params,
+    AES_Block* output,
+    AES_ErrorDetails* err_details
+) {
+    AES_UNUSED_PARAMETER(err_details);
+    *output = aes192_decrypt_block(*input, &params->aes192_dec_keys);
+    return AES_SUCCESS;
+}
+
+static AES_StatusCode aes_encrypt_block_aes256(
+    const AES_Block* input,
+    const AES_EncryptionRoundKeys* params,
+    AES_Block* output,
+    AES_ErrorDetails* err_details
+) {
+    AES_UNUSED_PARAMETER(err_details);
+    *output = aes256_encrypt_block(*input, &params->aes256_enc_keys);
+    return AES_SUCCESS;
+}
+
+static AES_StatusCode aes_decrypt_block_aes256(
+    const AES_Block* input,
+    const AES_DecryptionRoundKeys* params,
+    AES_Block* output,
+    AES_ErrorDetails* err_details
+) {
+    AES_UNUSED_PARAMETER(err_details);
+    *output = aes256_decrypt_block(*input, &params->aes256_dec_keys);
+    return AES_SUCCESS;
+}
+
+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);
+}