diff --git a/mars.h b/mars.h
index e0831172..31e2cb35 100644
--- a/mars.h
+++ b/mars.h
@@ -339,6 +339,14 @@ static inline void unuse_fake_mm(void) {}
 
 /////////////////////////////////////////////////////////////////////////
 
+/* Crypto stuff
+ */
+
+extern int mars_digest_size;
+extern void mars_digest(unsigned char *digest, void *data, int len);
+
+/////////////////////////////////////////////////////////////////////////
+
 // init
 
 extern int init_mars(void);
diff --git a/mars_generic.c b/mars_generic.c
index 3f66bf5c..50307936 100644
--- a/mars_generic.c
+++ b/mars_generic.c
@@ -93,6 +93,34 @@ const struct meta mars_timespec_meta[] = {
 EXPORT_SYMBOL_GPL(mars_timespec_meta);
 
 
+//////////////////////////////////////////////////////////////
+
+// crypto stuff
+
+#include <linux/crypto.h>
+
+struct crypto_hash *mars_tfm = NULL;
+int mars_digest_size = 0;
+EXPORT_SYMBOL_GPL(mars_digest_size);
+
+void mars_digest(unsigned char *digest, void *data, int len)
+{
+	struct hash_desc desc = {
+		.tfm = mars_tfm,
+		.flags = 0,
+	};
+	struct scatterlist sg;
+
+	memset(digest, 0, mars_digest_size);
+
+	crypto_hash_init(&desc);
+	sg_init_table(&sg, 1);
+	sg_set_buf(&sg, data, len);
+	crypto_hash_update(&desc, &sg, sg.length);
+	crypto_hash_final(&desc, digest);
+}
+EXPORT_SYMBOL_GPL(mars_digest);
+
 /////////////////////////////////////////////////////////////////////
 
 // tracing
@@ -250,13 +278,38 @@ int __init init_mars(void)
 		}
 	}
 #endif
+
+	mars_tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
+	if (!mars_tfm) {
+		MARS_ERR("cannot alloc crypto hash\n");
+		return -ENOMEM;
+	}
+	if (IS_ERR(mars_tfm)) {
+		MARS_ERR("alloc crypto hash failed, status = %d\n", (int)PTR_ERR(mars_tfm));
+		return PTR_ERR(mars_tfm);
+	}
+#if 0
+	if (crypto_tfm_alg_type(crypto_hash_tfm(mars_tfm)) != CRYPTO_ALG_TYPE_DIGEST) {
+		MARS_ERR("bad crypto hash type\n");
+		return -EINVAL;
+	}
+#endif
+	mars_digest_size = crypto_hash_digestsize(mars_tfm);
+	MARS_INF("digest_size = %d\n", mars_digest_size);
+
 	return 0;
 }
 
 void __exit exit_mars(void)
 {
 	MARS_INF("exit_mars()\n");
+
 	put_fake();
+
+	if (mars_tfm) {
+		crypto_free_hash(mars_tfm);
+	}
+
 #ifdef MARS_TRACING
 	if (mars_log_file) {
 		filp_close(mars_log_file, NULL);
diff --git a/sy_old/strategy.h b/sy_old/strategy.h
index c9ada6fc..398c763d 100644
--- a/sy_old/strategy.h
+++ b/sy_old/strategy.h
@@ -132,11 +132,6 @@ extern struct mars_global *mars_global;
 extern int  mars_power_button(struct mars_brick *brick, bool val, bool force_off);
 extern int  mars_power_button_recursive(struct mars_brick *brick, bool val, bool force_off, int timeout);
 
-/* Crypto stuff
- */
-extern int mars_digest_size;
-extern void mars_digest(unsigned char *digest, void *data, int len);
-
 /////////////////////////////////////////////////////////////////////////
 
 // quirk
diff --git a/sy_old/sy_generic.c b/sy_old/sy_generic.c
index dd860028..3b5f895c 100644
--- a/sy_old/sy_generic.c
+++ b/sy_old/sy_generic.c
@@ -260,34 +260,6 @@ EXPORT_SYMBOL_GPL(mars_remaining_space);
 
 //////////////////////////////////////////////////////////////
 
-// crypto stuff
-
-#include <linux/crypto.h>
-
-struct crypto_hash *mars_tfm = NULL;
-int mars_digest_size = 0;
-EXPORT_SYMBOL_GPL(mars_digest_size);
-
-void mars_digest(unsigned char *digest, void *data, int len)
-{
-	struct hash_desc desc = {
-		.tfm = mars_tfm,
-		.flags = 0,
-	};
-	struct scatterlist sg;
-
-	memset(digest, 0, mars_digest_size);
-
-	crypto_hash_init(&desc);
-	sg_init_table(&sg, 1);
-	sg_set_buf(&sg, data, len);
-	crypto_hash_update(&desc, &sg, sg.length);
-	crypto_hash_final(&desc, digest);
-}
-EXPORT_SYMBOL_GPL(mars_digest);
-
-//////////////////////////////////////////////////////////////
-
 // infrastructure
 
 struct mars_global *mars_global = NULL;
@@ -1484,33 +1456,12 @@ int __init init_sy(void)
 
 	_mars_trigger = __mars_trigger;
 
-	mars_tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
-	if (!mars_tfm) {
-		MARS_ERR("cannot alloc crypto hash\n");
-		return -ENOMEM;
-	}
-	if (IS_ERR(mars_tfm)) {
-		MARS_ERR("alloc crypto hash failed, status = %d\n", (int)PTR_ERR(mars_tfm));
-		return PTR_ERR(mars_tfm);
-	}
-#if 0
-	if (crypto_tfm_alg_type(crypto_hash_tfm(mars_tfm)) != CRYPTO_ALG_TYPE_DIGEST) {
-		MARS_ERR("bad crypto hash type\n");
-		return -EINVAL;
-	}
-#endif
-	mars_digest_size = crypto_hash_digestsize(mars_tfm);
-	MARS_INF("digest_size = %d\n", mars_digest_size);
-
 	return 0;
 }
 
 void __exit exit_sy(void)
 {
 	MARS_INF("exit_sy()\n");
-	if (mars_tfm) {
-		crypto_free_hash(mars_tfm);
-	}
 }
 
 #ifndef CONFIG_MARS_HAVE_BIGMODULE