chore: patch random functions in openssl to use arc4random_buf when compiled to wasi (#460)

Author: JakeChampion

c-dependencies/js-compute-runtime/Makefile

@@ -176,9 +176,10 @@ wasi_snapshot_preview1.reactor.wasm:
 openssl: $(BUILD)/openssl/token
 
 # Extract and prepare the openssl build directory.
-$(BUILD)/openssl-$(OPENSSL_VERSION)/token: $(BUILD)/openssl-$(OPENSSL_VERSION).tar.gz $(FSM_SRC)/third_party/getuid.patch
+$(BUILD)/openssl-$(OPENSSL_VERSION)/token: $(BUILD)/openssl-$(OPENSSL_VERSION).tar.gz $(FSM_SRC)/third_party/getuid.patch $(FSM_SRC)/third_party/rand.patch
 	$Q tar -C $(BUILD) -xf $<
 	$Q patch -d $(BUILD)/openssl-$(OPENSSL_VERSION) -p1 < $(FSM_SRC)/third_party/getuid.patch
+	$Q patch -d $(BUILD)/openssl-$(OPENSSL_VERSION) -p1 < $(FSM_SRC)/third_party/rand.patch
 	$Q touch $@
 
 OPENSSL_OPTS := -static -no-sock -no-asm -no-ui-console -no-egd

c-dependencies/js-compute-runtime/third_party/rand.patch

@@ -0,0 +1,25 @@
+diff --git openssl-3.0.7/crypto/rand/rand_lib.c openssl-3.0.7/crypto/rand/rand_lib.c
+--- a/crypto/rand/rand_lib.c
++++ b/crypto/rand/rand_lib.c
+@@ -320,6 +320,10 @@ const RAND_METHOD *RAND_get_rand_method(void)
+ int RAND_priv_bytes_ex(OSSL_LIB_CTX *ctx, unsigned char *buf, size_t num,
+                        unsigned int strength)
+ {
++#ifdef __wasi__
++    arc4random_buf(buf, num);
++    return 1;
++#endif
+     EVP_RAND_CTX *rand;
+ #if !defined(OPENSSL_NO_DEPRECATED_3_0) && !defined(FIPS_MODULE)
+     const RAND_METHOD *meth = RAND_get_rand_method();
+@@ -349,6 +353,10 @@ int RAND_priv_bytes(unsigned char *buf, int num)
+ int RAND_bytes_ex(OSSL_LIB_CTX *ctx, unsigned char *buf, size_t num,
+                   unsigned int strength)
+ {
++#ifdef __wasi__
++    arc4random_buf(buf, num);
++    return 1;
++#endif
+     EVP_RAND_CTX *rand;
+ #if !defined(OPENSSL_NO_DEPRECATED_3_0) && !defined(FIPS_MODULE)
+     const RAND_METHOD *meth = RAND_get_rand_method();