Expose sodium_crit_enter() and sodium_crit_leave() internally

src/libsodium/Makefile.am

@@ -102,6 +102,7 @@ libsodium_la_SOURCES = \
 	crypto_verify/64/ref/verify_64.c \
 	include/sodium/private/common.h \
 	include/sodium/private/curve25519_ref10.h \
+	include/sodium/private/mutex.h \
 	randombytes/randombytes.c \
 	sodium/core.c \
 	sodium/runtime.c \

src/libsodium/include/sodium/private/mutex.h

@@ -0,0 +1,7 @@
+#ifndef mutex_H
+#define mutex_H 1
+
+extern int sodium_crit_enter(void);
+extern int sodium_crit_leave(void);
+
+#endif

src/libsodium/randombytes/salsa20/randombytes_salsa20_random.c

@@ -27,6 +27,7 @@
 #include "randombytes.h"
 #include "randombytes_salsa20_random.h"
 #include "utils.h"
+#include "private/mutex.h"
 
 #ifdef _WIN32
 # include <windows.h>
@@ -297,7 +298,7 @@ randombytes_salsa20_random_rekey(const unsigned char * const mix)
 }
 
 static void
-randombytes_salsa20_random_stir(void)
+randombytes_salsa20_random_stir_unlocked(void)
 {
     /* constant to personalize the hash function */
     const unsigned char hsigma[crypto_generichash_KEYBYTES] = {
@@ -355,18 +356,26 @@ randombytes_salsa20_random_stir(void)
 #endif
 }
 
+static void
+randombytes_salsa20_random_stir(void)
+{
+    sodium_crit_enter();
+    randombytes_salsa20_random_stir_unlocked();
+    sodium_crit_leave();
+}
+
 static void
 randombytes_salsa20_random_stir_if_needed(void)
 {
 #ifdef HAVE_GETPID
     if (stream.initialized == 0) {
-        randombytes_salsa20_random_stir();
+        randombytes_salsa20_random_stir_unlocked();
     } else if (stream.pid != getpid()) {
         abort();
     }
 #else
     if (stream.initialized == 0) {
-        randombytes_salsa20_random_stir();
+        randombytes_salsa20_random_stir_unlocked();
     }
 #endif
 }
@@ -376,6 +385,7 @@ randombytes_salsa20_random_close(void)
 {
     int ret = -1;
 
+    sodium_crit_enter();
 #ifndef _WIN32
     if (stream.random_data_source_fd != -1 &&
         close(stream.random_data_source_fd) == 0) {
@@ -403,6 +413,8 @@ randombytes_salsa20_random_close(void)
         ret = 0;
     }
 #endif
+    sodium_crit_leave();
+
     return ret;
 }
 
@@ -412,6 +424,7 @@ randombytes_salsa20_random_buf(void * const buf, const size_t size)
     size_t i;
     int    ret;
 
+    sodium_crit_enter();
     randombytes_salsa20_random_stir_if_needed();
     COMPILER_ASSERT(sizeof stream.nonce == crypto_stream_salsa20_NONCEBYTES);
 #ifdef ULONG_LONG_MAX
@@ -427,14 +440,16 @@ randombytes_salsa20_random_buf(void * const buf, const size_t size)
     stream.nonce++;
     crypto_stream_salsa20_xor(stream.key, stream.key, sizeof stream.key,
                               (unsigned char *) &stream.nonce, stream.key);
+    sodium_crit_leave();
 }
 
 static uint32_t
-randombytes_salsa20_random_getword(void)
+randombytes_salsa20_random(void)
 {
     uint32_t val;
     int      ret;
 
+    sodium_crit_enter();
     COMPILER_ASSERT(sizeof stream.rnd32 >= (sizeof stream.key) + (sizeof val));
     COMPILER_ASSERT(((sizeof stream.rnd32) - (sizeof stream.key))
                     % sizeof val == (size_t) 0U);
@@ -453,16 +468,11 @@ randombytes_salsa20_random_getword(void)
     stream.rnd32_outleft -= sizeof val;
     memcpy(&val, &stream.rnd32[stream.rnd32_outleft], sizeof val);
     memset(&stream.rnd32[stream.rnd32_outleft], 0, sizeof val);
+    sodium_crit_leave();
 
     return val;
 }
 
-static uint32_t
-randombytes_salsa20_random(void)
-{
-    return randombytes_salsa20_random_getword();
-}
-
 static const char *
 randombytes_salsa20_implementation_name(void)
 {

src/libsodium/sodium/core.c

@@ -16,6 +16,7 @@
 #include "randombytes.h"
 #include "runtime.h"
 #include "utils.h"
+#include "private/mutex.h"
 
 #if !defined(_MSC_VER) && 1
 # warning This is unstable, untested, development code.
@@ -26,19 +27,16 @@
 # warning Alternatively, use the "stable" branch in the git repository.
 #endif
 
-static int _sodium_crit_enter(void);
-static int _sodium_crit_leave(void);
-
 static volatile int initialized;
 
 int
 sodium_init(void)
 {
-    if (_sodium_crit_enter() != 0) {
+    if (sodium_crit_enter() != 0) {
         return -1;
     }
     if (initialized != 0) {
-        if (_sodium_crit_leave() != 0) {
+        if (sodium_crit_leave() != 0) {
             return -1;
         }
         return 1;
@@ -52,7 +50,7 @@ sodium_init(void)
     _crypto_scalarmult_curve25519_pick_best_implementation();
     _crypto_stream_chacha20_pick_best_implementation();
     initialized = 1;
-    if (_sodium_crit_leave() != 0) {
+    if (sodium_crit_leave() != 0) {
         return -1;
     }
     return 0;
@@ -62,14 +60,14 @@ sodium_init(void)
 
 static pthread_mutex_t _sodium_lock = PTHREAD_MUTEX_INITIALIZER;
 
-static int
-_sodium_crit_enter(void)
+int
+sodium_crit_enter(void)
 {
     return pthread_mutex_lock(&_sodium_lock);
 }
 
-static int
-_sodium_crit_leave(void)
+int
+sodium_crit_leave(void)
 {
     return pthread_mutex_unlock(&_sodium_lock);
 }
@@ -79,7 +77,7 @@ _sodium_crit_leave(void)
 static CRITICAL_SECTION _sodium_lock;
 static volatile LONG    _sodium_lock_initialized;
 
-static int
+int
 _sodium_crit_init(void)
 {
     LONG status = 0L;
@@ -100,8 +98,8 @@ _sodium_crit_init(void)
     }
 }
 
-static int
-_sodium_crit_enter(void)
+int
+sodium_crit_enter(void)
 {
     if (_sodium_crit_init() != 0) {
         return -1;
@@ -111,8 +109,8 @@ _sodium_crit_enter(void)
     return 0;
 }
 
-static int
-_sodium_crit_leave(void)
+int
+sodium_crit_leave(void)
 {
     LeaveCriticalSection(&_sodium_lock);
 
@@ -123,8 +121,8 @@ _sodium_crit_leave(void)
 
 static volatile int _sodium_lock;
 
-static int
-_sodium_crit_enter(void)
+int
+sodium_crit_enter(void)
 {
 # ifdef HAVE_NANOSLEEP
     struct timespec q;
@@ -140,8 +138,8 @@ _sodium_crit_enter(void)
     return 0;
 }
 
-static int
-_sodium_crit_leave(void)
+int
+sodium_crit_leave(void)
 {
     __sync_lock_release(&_sodium_lock);
 
@@ -150,14 +148,14 @@ _sodium_crit_leave(void)
 
 #else
 
-static int
-_sodium_crit_enter(void)
+int
+sodium_crit_enter(void)
 {
     return 0;
 }
 
-static int
-_sodium_crit_leave(void)
+int
+sodium_crit_leave(void)
 {
     return 0;
 }