diff --git a/hutool-crypto/src/test/java/org/dromara/hutool/crypto/SignUtilTest.java b/hutool-crypto/src/test/java/org/dromara/hutool/crypto/SignUtilTest.java
new file mode 100644
index 000000000..241346101
--- /dev/null
+++ b/hutool-crypto/src/test/java/org/dromara/hutool/crypto/SignUtilTest.java
@@ -0,0 +1,60 @@
+package org.dromara.hutool.crypto;
+
+import org.dromara.hutool.core.codec.binary.Base64;
+import org.dromara.hutool.core.io.IoUtil;
+import org.dromara.hutool.core.lang.Assert;
+import org.dromara.hutool.crypto.asymmetric.Sign;
+import org.dromara.hutool.crypto.asymmetric.SignAlgorithm;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.security.PublicKey;
+
+public class SignUtilTest {
+
+	@Test
+	void signTest() {
+		final Sign sign = SignUtil.sign(SignAlgorithm.SHA256withRSA);
+
+		// 验证base64转换
+		final String base64 = KeyUtil.toBase64(sign.getPublicKey());
+		final PublicKey publicKey = KeyUtil.generatePublicKey(SignAlgorithm.SHA256withRSA.getValue(), Base64.decode(base64));
+		Assertions.assertEquals(sign.getPublicKey(), publicKey);
+
+		final String signHex = sign.signHex("abcd");
+		Assert.notNull(signHex);
+	}
+
+	@Test
+	void issueI6SRUFTest() {
+		// pem格式
+		final String publicKey = "-----BEGIN CERTIFICATE-----\n" +
+			"MIIEMTCCAxmgAwIBAgIGAXRTgcMnMA0GCSqGSIb3DQEBCwUAMHYxCzAJBgNVBAYT\n" +
+			"AkNOMRAwDgYDVQQIDAdCZWlKaW5nMRAwDgYDVQQHDAdCZWlKaW5nMRcwFQYDVQQK\n" +
+			"DA5MYWthbGEgQ28uLEx0ZDEqMCgGA1UEAwwhTGFrYWxhIE9yZ2FuaXphdGlvbiBW\n" +
+			"YWxpZGF0aW9uIENBMB4XDTIwMTAxMDA1MjQxNFoXDTMwMTAwODA1MjQxNFowZTEL\n" +
+			"MAkGA1UEBhMCQ04xEDAOBgNVBAgMB0JlaUppbmcxEDAOBgNVBAcMB0JlaUppbmcx\n" +
+			"FzAVBgNVBAoMDkxha2FsYSBDby4sTHRkMRkwFwYDVQQDDBBBUElHVy5MQUtBTEEu\n" +
+			"Q09NMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt1zHL54HiI8d2sLJ\n" +
+			"lwoQji3/ln0nsvfZ/XVpOjuB+1YR6/0LdxEDMC/hxI6iH2Rm5MjwWz3dmN/6BZeI\n" +
+			"gwGeTOWJUZFARo8UduKrlhC6gWMRpAiiGC8wA8stikc5gYB+UeFVZi/aJ0WN0cpP\n" +
+			"JYCvPBhxhMvhVDnd4hNohnR1L7k0ypuWg0YwGjC25FaNAEFBYP9EYUyCJjE//9Z7\n" +
+			"sMzHR9SJYCqqo6r9bOH9G6sWKuEp+osuAh+kJIxJMHfipw7w3tEcWG0hce9u/el4\n" +
+			"cYJtg8/PPMVoccKmeCzMvarr7jdKP4lenJbtwlgyfs+JgNu60KMUJH8RS72wC9NY\n" +
+			"uFz09wIDAQABo4HVMIHSMIGSBgNVHSMEgYowgYeAFCnH4DkZPR6CZxRn/kIqVsMo\n" +
+			"dJHpoWekZTBjMQswCQYDVQQGEwJDTjEQMA4GA1UECAwHQmVpSmluZzEQMA4GA1UE\n" +
+			"BwwHQmVpSmluZzEXMBUGA1UECgwOTGFrYWxhIENvLixMdGQxFzAVBgNVBAMMDkxh\n" +
+			"a2FsYSBSb290IENBggYBaiUALIowHQYDVR0OBBYEFJ2Kx9YZfmWpkKFnC33C0r5D\n" +
+			"K3rFMAwGA1UdEwEB/wQCMAAwDgYDVR0PAQH/BAQDAgeAMA0GCSqGSIb3DQEBCwUA\n" +
+			"A4IBAQBZoeU0XyH9O0LGF9R+JyGwfU/O5amoB97VeM+5n9v2z8OCiIJ8eXVGKN9L\n" +
+			"tl9QkpTEanYwK30KkpHcJP1xfVkhPi/cCMgfTWQ5eKYC7Zm16zk7n4CP6IIgZIqm\n" +
+			"TVGsIGKk8RzWseyWPB3lfqMDR52V1tdA1S8lJ7a2Xnpt5M2jkDXoArl3SVSwCb4D\n" +
+			"AmThYhak48M++fUJNYII9JBGRdRGbfJ2GSFdPXgesUL2CwlReQwbW4GZkYGOg9LK\n" +
+			"CNPK6XShlNdvgPv0CCR08KCYRwC3HZ0y1F0NjaKzYdGNPrvOq9lA495ONZCvzYDo\n" +
+			"gmsu/kd6eqxTs/JwdaIYr4sCMg8Z\n" +
+			"-----END CERTIFICATE-----";
+
+		final PublicKey key = (PublicKey) PemUtil.readPemKey(IoUtil.toUtf8Stream(publicKey));
+		new Sign(SignAlgorithm.SHA256withRSA, null, key);
+	}
+}