diff --git a/app/src/main/cpp/CMakeLists.txt b/app/src/main/cpp/CMakeLists.txt
index c0acd7cbf..0c7d4fda2 100644
--- a/app/src/main/cpp/CMakeLists.txt
+++ b/app/src/main/cpp/CMakeLists.txt
@@ -85,5 +85,5 @@ FetchContent_MakeAvailable(Corrosion)
 corrosion_import_crate(MANIFEST_PATH ../rust/Cargo.toml)
 
 # Build and link our app's native lib
-add_library(${PROJECT_NAME} SHARED archive.c border.c gifutils.c natsort/strnatcmp.c)
+add_library(${PROJECT_NAME} SHARED archive.c border.c gifutils.c hash.c natsort/strnatcmp.c)
 target_link_libraries(${PROJECT_NAME} ehviewer_rust archive_static log jnigraphics)
diff --git a/app/src/main/cpp/hash.c b/app/src/main/cpp/hash.c
new file mode 100644
index 000000000..1a199b934
--- /dev/null
+++ b/app/src/main/cpp/hash.c
@@ -0,0 +1,39 @@
+#include <unistd.h>
+
+#include <jni.h>
+#include <sha1.h>
+
+#include "ehviewer.h"
+
+#define BUFFER_SIZE 8192
+
+typedef uint8_t byte;
+
+const char hex_digits[] = "0123456789abcdef";
+
+JNIEXPORT jstring JNICALL
+Java_com_hippo_ehviewer_jni_HashKt_sha1(JNIEnv *env, jclass clazz, jint fd) {
+    EH_UNUSED(clazz);
+    struct sha1_ctx ctx;
+    sha1_init(&ctx);
+
+    size_t bytes_read;
+    byte buffer[BUFFER_SIZE];
+    while ((bytes_read = read(fd, buffer, BUFFER_SIZE)) > 0) {
+        sha1_update(&ctx, bytes_read, buffer);
+    }
+
+    byte digest[SHA1_DIGEST_SIZE];
+    sha1_digest(&ctx, SHA1_DIGEST_SIZE, digest);
+
+    byte byte;
+    char hex_digest[2 * SHA1_DIGEST_SIZE + 1];
+    for (int i = 0; i < SHA1_DIGEST_SIZE; i++) {
+        byte = digest[i];
+        hex_digest[2 * i] = hex_digits[byte >> 4 & 0xF];
+        hex_digest[2 * i + 1] = hex_digits[byte & 0xF];
+    }
+    hex_digest[2 * SHA1_DIGEST_SIZE] = '\0';
+
+    return (*env)->NewStringUTF(env, hex_digest);
+}
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/jni/Hash.kt b/app/src/main/kotlin/com/hippo/ehviewer/jni/Hash.kt
new file mode 100644
index 000000000..d0ddcece1
--- /dev/null
+++ b/app/src/main/kotlin/com/hippo/ehviewer/jni/Hash.kt
@@ -0,0 +1,3 @@
+package com.hippo.ehviewer.jni
+
+external fun sha1(fd: Int): String
diff --git a/app/src/main/kotlin/com/hippo/unifile/UniFileExtensions.kt b/app/src/main/kotlin/com/hippo/unifile/UniFileExtensions.kt
index d0fe372d0..5c136051b 100644
--- a/app/src/main/kotlin/com/hippo/unifile/UniFileExtensions.kt
+++ b/app/src/main/kotlin/com/hippo/unifile/UniFileExtensions.kt
@@ -5,15 +5,11 @@ import android.os.Environment
 import android.os.ParcelFileDescriptor.AutoCloseInputStream
 import android.os.ParcelFileDescriptor.AutoCloseOutputStream
 import android.provider.DocumentsContract
-import eu.kanade.tachiyomi.util.system.logcat
+import com.hippo.ehviewer.jni.sha1
 import java.io.File
 import java.io.FileInputStream
 import java.io.FileOutputStream
-import okio.HashingSink
 import okio.Path
-import okio.blackholeSink
-import okio.buffer
-import okio.source
 
 /**
  * Use Native IO/NIO directly if possible, unless you need process file content on JVM!
@@ -29,17 +25,7 @@ fun UniFile.openOutputStream(): FileOutputStream {
     return AutoCloseOutputStream(openFileDescriptor("w"))
 }
 
-fun UniFile.sha1() = runCatching {
-    openInputStream().source().buffer().use { source ->
-        HashingSink.sha1(blackholeSink()).use {
-            source.readAll(it)
-            it.hash.hex()
-        }
-    }
-}.getOrElse {
-    logcat(it)
-    null
-}
+fun UniFile.sha1() = openFileDescriptor("r").use { sha1(it.fd) }
 
 fun File.asUniFile() = UniFile.fromFile(this)