Add ARM NEON and AES runtime checks

configure.ac

@@ -554,7 +554,7 @@ AC_SUBST(CFLAGS_AESNI)
 AC_SUBST(CFLAGS_PCLMUL)
 AC_SUBST(CFLAGS_RDRAND)
 
-AC_CHECK_HEADERS([sys/mman.h sys/random.h intrin.h])
+AC_CHECK_HEADERS([sys/mman.h sys/random.h intrin.h sys/auxv.h])
 
 AC_MSG_CHECKING([if _xgetbv() is available])
 AC_LINK_IFELSE(
@@ -818,6 +818,7 @@ unsigned char buf;
 ])
 AC_CHECK_FUNCS([posix_memalign getpid nanosleep])
 AC_CHECK_FUNCS([memset_s explicit_bzero explicit_memset])
+AC_CHECK_FUNCS([getauxval])
 
 AC_SUBST([LIBTOOL_EXTRA_FLAGS])
 

dist-build/emscripten-symbols.def

@@ -606,6 +606,7 @@ _sodium_runtime_has_avx 0 0
 _sodium_runtime_has_avx2 0 0
 _sodium_runtime_has_avx512f 0 0
 _sodium_runtime_has_neon 0 0
+_sodium_runtime_has_armcrypto_aes 0 0
 _sodium_runtime_has_pclmul 0 0
 _sodium_runtime_has_rdrand 0 0
 _sodium_runtime_has_sse2 0 0

src/libsodium/include/sodium/runtime.h

@@ -11,6 +11,9 @@ extern "C" {
 SODIUM_EXPORT_WEAK
 int sodium_runtime_has_neon(void);
 
+SODIUM_EXPORT_WEAK
+int sodium_runtime_has_armcrypto_aes(void);
+
 SODIUM_EXPORT_WEAK
 int sodium_runtime_has_sse2(void);
 

src/libsodium/sodium/runtime.c

@@ -3,6 +3,14 @@
 #ifdef HAVE_ANDROID_GETCPUFEATURES
 # include <cpu-features.h>
 #endif
+#ifdef __APPLE__
+# include <sys/types.h>
+# include <sys/sysctl.h>
+# include <mach/machine.h>
+#endif
+#ifdef HAVE_SYS_AUXV_H
+# include <sys/auxv.h>
+#endif
 
 #include "private/common.h"
 #include "runtime.h"
@@ -10,6 +18,7 @@
 typedef struct CPUFeatures_ {
     int initialized;
     int has_neon;
+    int has_armcrypto_aes;
     int has_sse2;
     int has_sse3;
     int has_ssse3;
@@ -48,25 +57,50 @@ static CPUFeatures _cpu_features;
 static int
 _sodium_runtime_arm_cpu_features(CPUFeatures * const cpu_features)
 {
+    cpu_features->has_neon = 0;
+    cpu_features->has_armcrypto_aes = 0;
+
 #ifndef __arm__
-    cpu_features->has_neon = 0;
-    return -1;
-#else
-# ifdef __APPLE__
-#  ifdef __ARM_NEON__
+    return -1; /* LCOV_EXCL_LINE */
+#endif
+
+#if defined(__ARM_NEON) || defined(__aarch64__)
     cpu_features->has_neon = 1;
-#  else
-    cpu_features->has_neon = 0;
-#  endif
-# elif defined(HAVE_ANDROID_GETCPUFEATURES) && \
-    defined(ANDROID_CPU_ARM_FEATURE_NEON)
+#elif defined(HAVE_ANDROID_GETCPUFEATURES) && defined(ANDROID_CPU_ARM_FEATURE_NEON)
     cpu_features->has_neon =
         (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0x0;
-# else
-    cpu_features->has_neon = 0;
-# endif
-    return 0;
+#elif defined(HAVE_GETAUXVAL) && defined(AT_HWCAP) && defined(__aarch64__)
+    cpu_features->has_neon = (getauxval(AT_HWCAP) & (1L << 1)) != 0;
 #endif
+
+    if (cpu_features->has_neon == 0) {
+        return 0;
+    }
+
+#if __ARM_FEATURE_CRYPTO
+    cpu_features->has_armcrypto_aes = 1;
+#elif defined(__APPLE__) && defined(CPU_TYPE_ARM64) && defined(CPU_SUBTYPE_ARM64E)
+    {
+        cpu_type_t    cpu_type;
+        cpu_subtype_t cpu_subtype;
+        size_t        cpu_type_len = sizeof cpu_type;
+        size_t        cpu_subtype_len = sizeof cpu_subtype;
+
+        if (sysctlbyname("hw.cputype", &cpu_type, &cpu_type_len,
+                         NULL, 0) == 0 && cpu_type == CPU_TYPE_ARM64 &&
+            sysctlbyname("hw.cpusubtype", &cpu_subtype, &cpu_subtype_len,
+                         NULL, 0) == 0 && cpu_type == CPU_SUBTYPE_ARM64E) {
+            cpu_features->has_armcrypto_aes = 1;
+        }
+    }
+#elif defined(HAVE_ANDROID_GETCPUFEATURES) && defined(ANDROID_CPU_ARM_FEATURE_AES)
+    cpu_features->has_armcrypto_aes =
+        (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_AES) != 0x0;
+#elif defined(HAVE_GETAUXVAL) && defined(AT_HWCAP) && defined(__aarch64__)
+    cpu_features->has_armcrypto_aes = (getauxval(AT_HWCAP) & (1L << 3)) != 0;
+#endif
+
+    return 0;
 }
 
 static void
@@ -248,6 +282,12 @@ sodium_runtime_has_neon(void)
     return _cpu_features.has_neon;
 }
 
+int
+sodium_runtime_has_armcrypto_aes(void)
+{
+    return _cpu_features.has_armcrypto_aes;
+}
+
 int
 sodium_runtime_has_sse2(void)
 {

test/default/sodium_core.c

@@ -19,6 +19,7 @@ main(void)
     assert(sodium_init() == 1);
 
     (void) sodium_runtime_has_neon();
+    (void) sodium_runtime_has_armcrypto_aes();
     (void) sodium_runtime_has_sse2();
     (void) sodium_runtime_has_sse3();
     (void) sodium_runtime_has_ssse3();

test/symbols/all-symbols.txt

@@ -680,6 +680,7 @@ sodium_munlock
 sodium_munshield
 sodium_pad
 sodium_runtime_has_aesni
+sodium_runtime_has_armcrypto_aes
 sodium_runtime_has_avx
 sodium_runtime_has_avx2
 sodium_runtime_has_avx512f