diff --git a/hutool-crypto/src/test/java/org/dromara/hutool/crypto/symmetric/Issue3871Test.java b/hutool-crypto/src/test/java/org/dromara/hutool/crypto/symmetric/Issue3871Test.java
new file mode 100644
index 000000000..2f33c101a
--- /dev/null
+++ b/hutool-crypto/src/test/java/org/dromara/hutool/crypto/symmetric/Issue3871Test.java
@@ -0,0 +1,23 @@
+package org.dromara.hutool.crypto.symmetric;
+
+import org.dromara.hutool.crypto.Mode;
+import org.dromara.hutool.crypto.SecureUtil;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+/**
+ * https://tool.hiofd.com/sm4-encrypt-online/
+ */
+public class Issue3871Test {
+	@Test
+	void sm4Test(){
+		final String data = "{\"mobile\":\"13333333333\"}";
+		final byte[] key = SecureUtil.decode("Q5v/nsxmaCdFiltxIz+TCQ==");
+		final byte[] iv = SecureUtil.decode("Dz15D//HqTvavbckOWgKiw==");
+
+		final SM4 sm4 = new SM4(Mode.CBC.name(), "PKCS5Padding", key, iv);
+		final String encryptBase64 = sm4.encryptBase64(data);
+		Assertions.assertEquals("T6J7tGSQXam0BPauZIamqd5lJ/+I6q42vlziP3HBtT8=", encryptBase64);
+		Assertions.assertEquals(data, sm4.decryptStr(encryptBase64));
+	}
+}