From b0e15c7d9a0cc5ca31809b01254bca5f3a72f047 Mon Sep 17 00:00:00 2001
From: Egor Tensin <egor@tensin.name>
Date: Thu, 23 Jul 2026 15:17:35 +0200
Subject: make buildable on Linux

---
 aes/include/aes/aes.h         | 13 +++++++------
 aes/include/aes/round_keys.h  | 23 +++++++++--------------
 aes/include/aes/workarounds.h |  9 +++++++++
 3 files changed, 25 insertions(+), 20 deletions(-)

(limited to 'aes/include')

diff --git a/aes/include/aes/aes.h b/aes/include/aes/aes.h
index 8f1e511..3cfaf8a 100644
--- a/aes/include/aes/aes.h
+++ b/aes/include/aes/aes.h
@@ -9,6 +9,7 @@
 
 #include "block.h"
 #include "round_keys.h"
+#include "workarounds.h"
 
 #include <assert.h>
 
@@ -16,13 +17,13 @@
 extern "C" {
 #endif
 
-AES_Block __fastcall aes128_encrypt_block_internal(AES_Block, const AES128_RoundKeys*);
-AES_Block __fastcall aes192_encrypt_block_internal(AES_Block, const AES192_RoundKeys*);
-AES_Block __fastcall aes256_encrypt_block_internal(AES_Block, const AES256_RoundKeys*);
+AES_Block AES_ASM_ATTR aes128_encrypt_block_internal(AES_Block, const AES128_RoundKeys*);
+AES_Block AES_ASM_ATTR aes192_encrypt_block_internal(AES_Block, const AES192_RoundKeys*);
+AES_Block AES_ASM_ATTR aes256_encrypt_block_internal(AES_Block, const AES256_RoundKeys*);
 
-AES_Block __fastcall aes128_decrypt_block_internal(AES_Block, const AES128_RoundKeys*);
-AES_Block __fastcall aes192_decrypt_block_internal(AES_Block, const AES192_RoundKeys*);
-AES_Block __fastcall aes256_decrypt_block_internal(AES_Block, const AES256_RoundKeys*);
+AES_Block AES_ASM_ATTR aes128_decrypt_block_internal(AES_Block, const AES128_RoundKeys*);
+AES_Block AES_ASM_ATTR aes192_decrypt_block_internal(AES_Block, const AES192_RoundKeys*);
+AES_Block AES_ASM_ATTR aes256_decrypt_block_internal(AES_Block, const AES256_RoundKeys*);
 
 static inline AES_Block aes128_encrypt_block(AES_Block plaintext, const AES128_RoundKeys* keys) {
     assert(keys);
diff --git a/aes/include/aes/round_keys.h b/aes/include/aes/round_keys.h
index be35f24..4d9af69 100644
--- a/aes/include/aes/round_keys.h
+++ b/aes/include/aes/round_keys.h
@@ -10,6 +10,7 @@
 #include "block.h"
 #include "error.h"
 #include "key.h"
+#include "workarounds.h"
 
 #include <assert.h>
 
@@ -29,31 +30,25 @@ typedef struct {
     AES_Block keys[15];
 } AES256_RoundKeys;
 
-void __fastcall aes128_expand_key_internal(AES_Block key, AES128_RoundKeys* encryption_keys);
+void AES_ASM_ATTR aes128_expand_key_internal(AES_Block key, AES128_RoundKeys* encryption_keys);
 
-void __fastcall aes192_expand_key_internal(
-    AES_Block key_lo,
-    AES_Block key_hi,
-    AES192_RoundKeys* encryption_keys
-);
+void AES_ASM_ATTR
+aes192_expand_key_internal(AES_Block key_lo, AES_Block key_hi, AES192_RoundKeys* encryption_keys);
 
-void __fastcall aes256_expand_key_internal(
-    AES_Block key_lo,
-    AES_Block key_hi,
-    AES256_RoundKeys* encryption_keys
-);
+void AES_ASM_ATTR
+aes256_expand_key_internal(AES_Block key_lo, AES_Block key_hi, AES256_RoundKeys* encryption_keys);
 
-void __fastcall aes128_derive_decryption_keys_internal(
+void AES_ASM_ATTR aes128_derive_decryption_keys_internal(
     const AES128_RoundKeys* encryption_keys,
     AES128_RoundKeys* decryption_keys
 );
 
-void __fastcall aes192_derive_decryption_keys_internal(
+void AES_ASM_ATTR aes192_derive_decryption_keys_internal(
     const AES192_RoundKeys* encryption_keys,
     AES192_RoundKeys* decryption_keys
 );
 
-void __fastcall aes256_derive_decryption_keys_internal(
+void AES_ASM_ATTR aes256_derive_decryption_keys_internal(
     const AES256_RoundKeys* encryption_keys,
     AES256_RoundKeys* decryption_keys
 );
diff --git a/aes/include/aes/workarounds.h b/aes/include/aes/workarounds.h
index 4a728c4..084a689 100644
--- a/aes/include/aes/workarounds.h
+++ b/aes/include/aes/workarounds.h
@@ -16,3 +16,12 @@
 #endif
 
 #define AES_UNUSED_PARAMETER(...) (void)(__VA_ARGS__)
+
+/* Targetting 32-bit Windows, match the existing ASM implementation's behavior
+ * (__fastcall). Otherwise, do nothing, using the standard calling convention
+ * by default. */
+#if defined(_MSC_VER) && !defined(_WIN64)
+#define AES_ASM_ATTR __fastcall
+#else
+#define AES_ASM_ATTR
+#endif
-- 
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