1 files changed, 206 insertions, 0 deletions
diff --git a/libs/libsodium/src/randombytes/randombytes.c b/libs/libsodium/src/randombytes/randombytes.c
new file mode 100644
index 0000000000..708616b8aa
--- /dev/null
+++ b/libs/libsodium/src/randombytes/randombytes.c
@@ -0,0 +1,206 @@
+
+#include <assert.h>
+#include <limits.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <sys/types.h>
+
+#ifdef __EMSCRIPTEN__
+# include <emscripten.h>
+#endif
+
+#include "core.h"
+#include "crypto_stream_chacha20.h"
+#include "randombytes.h"
+#ifdef RANDOMBYTES_DEFAULT_IMPLEMENTATION
+# include "randombytes_default.h"
+#else
+# ifdef __native_client__
+#  include "randombytes_nativeclient.h"
+# else
+#  include "randombytes_sysrandom.h"
+# endif
+#endif
+#include "private/common.h"
+
+/* C++Builder defines a "random" macro */
+#undef random
+
+static const randombytes_implementation *implementation;
+
+#ifndef RANDOMBYTES_DEFAULT_IMPLEMENTATION
+# ifdef __EMSCRIPTEN__
+#  define RANDOMBYTES_DEFAULT_IMPLEMENTATION NULL
+# else
+#  ifdef __native_client__
+#   define RANDOMBYTES_DEFAULT_IMPLEMENTATION &randombytes_nativeclient_implementation;
+#  else
+#   define RANDOMBYTES_DEFAULT_IMPLEMENTATION &randombytes_sysrandom_implementation;
+#  endif
+# endif
+#endif
+
+static void
+randombytes_init_if_needed(void)
+{
+    if (implementation == NULL) {
+        implementation = RANDOMBYTES_DEFAULT_IMPLEMENTATION;
+        randombytes_stir();
+    }
+}
+
+int
+randombytes_set_implementation(randombytes_implementation *impl)
+{
+    implementation = impl;
+
+    return 0;
+}
+
+const char *
+randombytes_implementation_name(void)
+{
+#ifndef __EMSCRIPTEN__
+    randombytes_init_if_needed();
+    return implementation->implementation_name();
+#else
+    return "js";
+#endif
+}
+
+uint32_t
+randombytes_random(void)
+{
+#ifndef __EMSCRIPTEN__
+    randombytes_init_if_needed();
+    return implementation->random();
+#else
+    return EM_ASM_INT_V({
+        return Module.getRandomValue();
+    });
+#endif
+}
+
+void
+randombytes_stir(void)
+{
+#ifndef __EMSCRIPTEN__
+    randombytes_init_if_needed();
+    if (implementation->stir != NULL) {
+        implementation->stir();
+    }
+#else
+    EM_ASM({
+        if (Module.getRandomValue === undefined) {
+            try {
+                var window_ = 'object' === typeof window ? window : self;
+                var crypto_ = typeof window_.crypto !== 'undefined' ? window_.crypto : window_.msCrypto;
+                var randomValuesStandard = function() {
+                    var buf = new Uint32Array(1);
+                    crypto_.getRandomValues(buf);
+                    return buf[0] >>> 0;
+                };
+                randomValuesStandard();
+                Module.getRandomValue = randomValuesStandard;
+            } catch (e) {
+                try {
+                    var crypto = require('crypto');
+                    var randomValueNodeJS = function() {
+                        var buf = crypto.randomBytes(4);
+                        return (buf[0] << 24 | buf[1] << 16 | buf[2] << 8 | buf[3]) >>> 0;
+                    };
+                    randomValueNodeJS();
+                    Module.getRandomValue = randomValueNodeJS;
+                } catch (e) {
+                    throw 'No secure random number generator found';
+                }
+            }
+        }
+    });
+#endif
+}
+
+uint32_t
+randombytes_uniform(const uint32_t upper_bound)
+{
+    uint32_t min;
+    uint32_t r;
+
+#ifndef __EMSCRIPTEN__
+    randombytes_init_if_needed();
+    if (implementation->uniform != NULL) {
+        return implementation->uniform(upper_bound);
+    }
+#endif
+    if (upper_bound < 2) {
+        return 0;
+    }
+    min = (1U + ~upper_bound) % upper_bound; /* = 2**32 mod upper_bound */
+    do {
+        r = randombytes_random();
+    } while (r < min);
+    /* r is now clamped to a set whose size mod upper_bound == 0
+     * the worst case (2**31+1) requires ~ 2 attempts */
+
+    return r % upper_bound;
+}
+
+void
+randombytes_buf(void * const buf, const size_t size)
+{
+#ifndef __EMSCRIPTEN__
+    randombytes_init_if_needed();
+    if (size > (size_t) 0U) {
+        implementation->buf(buf, size);
+    }
+#else
+    unsigned char *p = (unsigned char *) buf;
+    size_t         i;
+
+    for (i = (size_t) 0U; i < size; i++) {
+        p[i] = (unsigned char) randombytes_random();
+    }
+#endif
+}
+
+void
+randombytes_buf_deterministic(void * const buf, const size_t size,
+                              const unsigned char seed[randombytes_SEEDBYTES])
+{
+    static const unsigned char nonce[crypto_stream_chacha20_ietf_NONCEBYTES] = {
+        'L', 'i', 'b', 's', 'o', 'd', 'i', 'u', 'm', 'D', 'R', 'G'
+    };
+
+    COMPILER_ASSERT(randombytes_SEEDBYTES == crypto_stream_chacha20_ietf_KEYBYTES);
+#if SIZE_MAX > 0x4000000000ULL
+    COMPILER_ASSERT(randombytes_BYTES_MAX <= 0x4000000000ULL);
+    if (size > 0x4000000000ULL) {
+        sodium_misuse();
+    }
+#endif
+    crypto_stream_chacha20_ietf((unsigned char *) buf, (unsigned long long) size,
+                                nonce, seed);
+}
+
+size_t
+randombytes_seedbytes(void)
+{
+    return randombytes_SEEDBYTES;
+}
+
+int
+randombytes_close(void)
+{
+    if (implementation != NULL && implementation->close != NULL) {
+        return implementation->close();
+    }
+    return 0;
+}
+
+void
+randombytes(unsigned char * const buf, const unsigned long long buf_len)
+{
+    assert(buf_len <= SIZE_MAX);
+    randombytes_buf(buf, (size_t) buf_len);
+}