diff --git a/source/crypto/crypto-classic/src/main/java/com/jd/blockchain/crypto/utils/classic/ECDSAUtils.java b/source/crypto/crypto-classic/src/main/java/com/jd/blockchain/crypto/utils/classic/ECDSAUtils.java
index 097ce957..73b9e7b3 100644
--- a/source/crypto/crypto-classic/src/main/java/com/jd/blockchain/crypto/utils/classic/ECDSAUtils.java
+++ b/source/crypto/crypto-classic/src/main/java/com/jd/blockchain/crypto/utils/classic/ECDSAUtils.java
@@ -7,6 +7,8 @@ import org.bouncycastle.crypto.CipherParameters;
 import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
 import org.bouncycastle.crypto.params.*;
 import org.bouncycastle.crypto.signers.ECDSASigner;
+import org.bouncycastle.jce.ECNamedCurveTable;
+import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
 import org.bouncycastle.math.ec.ECCurve;
 import org.bouncycastle.math.ec.ECMultiplier;
 import org.bouncycastle.math.ec.ECPoint;
@@ -28,12 +30,10 @@ public class ECDSAUtils {
 
     // p = 2^256 - 2^32 - 2^9 - 2^8 - 2^7 - 2^6 - 2^4 - 1
     // the curve equation is y^2 = x^3 + 7.
-    private static final X9ECParameters X9_PARAMS = SECNamedCurves.getByName("secp256k1");
-    private static final ECCurve CURVE = X9_PARAMS.getCurve();
-    private static final ECPoint ECDSA_G = X9_PARAMS.getG();
-    private static final BigInteger ECDSA_H = X9_PARAMS.getH();
-    private static final BigInteger ECDSA_N = X9_PARAMS.getN();
-    private static final ECDomainParameters DOMAIN_PARAMS = new ECDomainParameters(CURVE, ECDSA_G,ECDSA_N,ECDSA_H);
+    private static final ECNamedCurveParameterSpec PARAMS = ECNamedCurveTable.getParameterSpec("secp256k1");
+    private static final ECCurve CURVE = PARAMS.getCurve();
+    private static final ECDomainParameters DOMAIN_PARAMS = new ECDomainParameters(
+            CURVE, PARAMS.getG(), PARAMS.getN(), PARAMS.getH());
 
 
     //-----------------Key Generation Algorithm-----------------
diff --git a/source/crypto/crypto-pki/src/main/java/com/jd/blockchain/crypto/utils/CSRBuilder.java b/source/crypto/crypto-pki/src/main/java/com/jd/blockchain/crypto/utils/CSRBuilder.java
index 790cb7db..3de606db 100644
--- a/source/crypto/crypto-pki/src/main/java/com/jd/blockchain/crypto/utils/CSRBuilder.java
+++ b/source/crypto/crypto-pki/src/main/java/com/jd/blockchain/crypto/utils/CSRBuilder.java
@@ -16,6 +16,9 @@ import org.bouncycastle.util.encoders.Base64;
 
 import java.io.IOException;
 import java.security.*;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.PKCS8EncodedKeySpec;
+import java.security.spec.X509EncodedKeySpec;
 
 /**
  * @author zhanglin33
@@ -25,16 +28,18 @@ import java.security.*;
  */
 public class CSRBuilder {
 
-    private String BC = BouncyCastleProvider.PROVIDER_NAME;
+    private final String BC = BouncyCastleProvider.PROVIDER_NAME;
 
     private PublicKey pubKey;
     private PrivateKey privKey;
 
     private String algoName;
+    private int keyLength;
 
     public void init() {
         Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
         algoName = "SHA1withRSA";
+        keyLength = 2048;
         KeyPairGenerator generator;
         try {
             generator = KeyPairGenerator.getInstance("RSA", BC);
@@ -47,10 +52,11 @@ public class CSRBuilder {
         }
     }
 
-    public void init(String algoName, int KeyLength) {
+    public void init(String algoName, int keyLength) {
 
         Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
-        this.algoName = algoName;
+        this.algoName  = algoName;
+        this.keyLength = keyLength;
 
         KeyPairGenerator generator;
         KeyPair keyPair;
@@ -60,34 +66,69 @@ public class CSRBuilder {
             switch (hashAndSignature[1]) {
                 case "RSA": {
                     generator = KeyPairGenerator.getInstance("RSA", BC);
-                    generator.initialize(KeyLength);
-                    keyPair = generator.generateKeyPair();
-                    pubKey = keyPair.getPublic();
-                    privKey = keyPair.getPrivate();
+                    generator.initialize(keyLength);
                     break;
                 }
 
                 case "SM2": {
                     generator = KeyPairGenerator.getInstance("EC", BC);
-                    if (KeyLength != 256) {
+                    if (keyLength != 256) {
                         throw new CryptoException("SM3withSM2 with unsupported key length [" +
-                                KeyLength +"] in CSR!");
+                                keyLength +"] in CSR!");
                     }
                     generator.initialize(new ECNamedCurveGenParameterSpec("sm2p256v1"));
-                    keyPair = generator.generateKeyPair();
-                    pubKey = keyPair.getPublic();
-                    privKey = keyPair.getPrivate();
                     break;
                 }
 
                 default: throw new CryptoException("Unsupported algorithm [" + algoName + "] with key length [" +
-                        KeyLength +"] in CSR!");
+                        keyLength +"] in CSR!");
             }
+            keyPair = generator.generateKeyPair();
+            pubKey = keyPair.getPublic();
+            privKey = keyPair.getPrivate();
         } catch (NoSuchAlgorithmException | NoSuchProviderException | InvalidAlgorithmParameterException e) {
             throw new CryptoException(e.getMessage(), e);
         }
     }
 
+    public void init(String algoName, byte[] pubKeyBytes, byte[] privKeyBytes) {
+
+        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
+        this.algoName = algoName;
+        String[] hashAndSignature = algoName.split("with");
+
+        X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(pubKeyBytes);
+        PKCS8EncodedKeySpec privKeySpec = new PKCS8EncodedKeySpec(privKeyBytes);
+
+        KeyFactory keyFactory;
+
+        try {
+            switch (hashAndSignature[1]) {
+                case "RSA": {
+                    keyFactory = KeyFactory.getInstance("RSA");
+                    privKey = keyFactory.generatePrivate(privKeySpec);
+                    pubKey  = keyFactory.generatePublic(pubKeySpec);
+                    keyLength = (pubKey.getEncoded().length < 4096 / 8)? 2048: 4096;
+                    break;
+                }
+
+                case "SM2": {
+                    keyFactory = KeyFactory.getInstance("EC", BouncyCastleProvider.PROVIDER_NAME);
+                    privKey = keyFactory.generatePrivate(privKeySpec);
+                    pubKey  = keyFactory.generatePublic(pubKeySpec);
+                    keyLength = 256;
+                    break;
+                }
+
+                default: throw new CryptoException("Unsupported algorithm [" + algoName + "] with the given key pair!");
+            }
+        } catch (InvalidKeySpecException | NoSuchAlgorithmException | NoSuchProviderException e) {
+            throw new CryptoException(e.getMessage(), e);
+        }
+
+
+    }
+
     public String buildRequest(String countryName, String stateName, String cityName,
                                String organizationName, String departmentName, String domainName,
                                String emailName) {
@@ -126,4 +167,12 @@ public class CSRBuilder {
     public PrivateKey getPrivKey() {
         return privKey;
     }
+
+    public String getAlgoName() {
+        return algoName;
+    }
+
+    public int getKeyLength() {
+        return keyLength;
+    }
 }
diff --git a/source/crypto/crypto-pki/src/main/java/com/jd/blockchain/crypto/utils/CertParser.java b/source/crypto/crypto-pki/src/main/java/com/jd/blockchain/crypto/utils/CertParser.java
index 8267d28b..e54c17db 100644
--- a/source/crypto/crypto-pki/src/main/java/com/jd/blockchain/crypto/utils/CertParser.java
+++ b/source/crypto/crypto-pki/src/main/java/com/jd/blockchain/crypto/utils/CertParser.java
@@ -25,6 +25,7 @@ public class CertParser {
     private String sigAlgName;
     private String userName;
     private String issuerName;
+    private int keyLength;
 
     private Date startTime;
     private Date endTime;
@@ -71,6 +72,17 @@ public class CertParser {
         sigAlgName = userCert.getSigAlgName();
         issuerName = userCert.getIssuerX500Principal().getName();
         userName   = userCert.getSubjectX500Principal().getName();
+
+        switch (sigAlgName) {
+            case "SM3WITHSM2": {
+                keyLength = 256;
+                break;
+            }
+            case "SHA1WITHRSA": {
+                keyLength = (pubKey.getEncoded().length < 4096 / 8)? 2048: 4096;
+                break;
+            }
+        }
     }
 
     // certificate string in Base64 format
@@ -121,6 +133,10 @@ public class CertParser {
         return issuerName;
     }
 
+    public int getKeyLength() {
+        return keyLength;
+    }
+
     public Date getStartTime() {
         return startTime;
     }
diff --git a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA2048SignatureFunctionTest.java b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA2048SignatureFunctionTest.java
index b7c7d831..64ca7eb5 100644
--- a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA2048SignatureFunctionTest.java
+++ b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA2048SignatureFunctionTest.java
@@ -1,9 +1,13 @@
 package com.jd.blockchain.crypto.service.pki;
 
 import com.jd.blockchain.crypto.*;
+import com.jd.blockchain.crypto.utils.CSRBuilder;
+import com.jd.blockchain.crypto.utils.CertParser;
 import com.jd.blockchain.utils.io.BytesUtils;
+import org.bouncycastle.util.encoders.Hex;
 import org.junit.Test;
 
+import java.security.*;
 import java.util.Random;
 
 import static com.jd.blockchain.crypto.CryptoAlgorithm.*;
@@ -125,4 +129,145 @@ public class SHA1WITHRSA2048SignatureFunctionTest {
                 resolvedSignatureDigest.getAlgorithm());
         assertArrayEquals(signatureDigestBytes, resolvedSignatureDigest.toBytes());
     }
+
+    @Test
+    public void testWithCSRAndCert() {
+
+        String countryName = "CN";
+        String stateName = "Beijing";
+        String cityName = "Beijing";
+        String organizationName = "JD.com";
+        String departmentName = "Blockchain Department";
+        String domainName = "ledger.jd.com";
+        String emailName = "zhanglin33@jd.com";
+
+
+        String publicKeyStr =  "30820122300d06092a864886f70d01010105000382010f003082010a0282010100c91e978897a36b" +
+                "30a57d265807441b0eff40c5572ecf029cd0cb2999b715edd2d5345c7b60c003075b1352629d03b943d08b25bfc5245" +
+                "a400f9ecbc1757394eac452d6316bf90cfcff5edfc427e277aa5266e89b1b2daa2e69dad5575515f49417c9ff332c83" +
+                "0dcd5537381f08e00b11123ad947bb11b18666d264ab5d8cdc92d0967fd7e0e6677746e2f01270d0594f74cda4e9d77" +
+                "4c6f3824499896bfb6424684af260d71b57a1366b741104fc647d9e38de055568daad60c116686e4afa1e9c83e9e30c" +
+                "7216e61353da2f75b2dde2c0ae870cf0ccc90490d1e22ecccbf3985d30933689847e6faf946993f930f83ac5b816075" +
+                "793a9a6df20727552a21be30203010001";
+
+        String privateKeyStr = "308204bd020100300d06092a864886f70d0101010500048204a7308204a30201000282010100c91e" +
+                "978897a36b30a57d265807441b0eff40c5572ecf029cd0cb2999b715edd2d5345c7b60c003075b1352629d03b943d08" +
+                "b25bfc5245a400f9ecbc1757394eac452d6316bf90cfcff5edfc427e277aa5266e89b1b2daa2e69dad5575515f49417" +
+                "c9ff332c830dcd5537381f08e00b11123ad947bb11b18666d264ab5d8cdc92d0967fd7e0e6677746e2f01270d0594f7" +
+                "4cda4e9d774c6f3824499896bfb6424684af260d71b57a1366b741104fc647d9e38de055568daad60c116686e4afa1e" +
+                "9c83e9e30c7216e61353da2f75b2dde2c0ae870cf0ccc90490d1e22ecccbf3985d30933689847e6faf946993f930f83" +
+                "ac5b816075793a9a6df20727552a21be30203010001028201003975637e93300d8a2ee573e47762f6461117cca96d46" +
+                "982cfc1be6ed3318f142a845d6dc2ad680a703d69fd56b9d6a3b1d23fbeb6f63c4e303736f2bfca5c2585631825f494" +
+                "534783d6f3a07bd0b5efbcaa1faf7814ac9118c8d8820f4be9a8b0ac6db819fc86b538bf284369d9f009a667668a82d" +
+                "224f7122041eddb492ef5b02d462aa11bc550bf3785a5d7538043586cfb0cd5c313a4746f22a5d4a89a412b279a7517" +
+                "176b1858a9677a1a60605aa0b2a7d260cf2e9e23a0e67c4a23ac046c62973239e84874c3695cc3f34073a62bd50b597" +
+                "ee06092a93fa6e41303ab4d2293ffad4c8db06e6516ae0a26a4d681305c3b7d535b540a638ca6cff1ce483750281810" +
+                "0e39967c5b287bd319b448255a1033591c74f4d688eb71f89a674cdb1be999e9abcf40e6b7f0bb3054262d7625002da" +
+                "7d34e56055ee130b66d682a0b9f8ea240a7e2dd1ff3f4b32f3bd352ba0a5dffc0315da34922493c267597787222213b" +
+                "f87d99fbd2a809c2647a1937cd1e303d746373db7c409a2ef33f8c06bb838bc612702818100e2374c71db5f0b4a199f" +
+                "f9d646a1785a84383a14aceb506f515b380c69ff45b51d0e941f55f0a234d8a3ee30bed656142bb5b985e462c44d234" +
+                "cfd424ecd6ca5fc70503862978ffe42b45bd698a99091d6fc65e2d85652e0ef56c52e8e05a6c5e879922c1d794e22f3" +
+                "51998217b5c6637a6abb716bf90cd1f23a2eedcdfface50281805d28a872224e2f2183e539d7e4ccd47b73f240c4004" +
+                "e72493c69e8dbcd2141eb22565f249edee20ad00e770c95a5655b0470b2cad964d030eab293292bfa62802cff824a10" +
+                "d52de8d8545024346106dd186fb53ef05bcea1d0dbfce2fac1cc8ec583fdc0ccdd9d498a983cea081ac55dc734aae84" +
+                "1ed802d6caf0e285c88b6d702818068b2a752daf1364c6967bd3e0b1a98956c3489cd1feb19232c4847bc97226aa4d4" +
+                "79f6dc39ee51649c0fe321f471470db6dd38ac5b73caded8c3bd437f2d5c67c65a450693bb0a0de7d989d7dc783e4d0" +
+                "16f77c871d02233b1123bd8bc2aa97157934cafd6445a819a93ddb4743cd141215b5cbdb5f7629398c48d0bcb17d671" +
+                "028181009282554329b89bcb2236a7e2a5bff53627e3ca7cc792d65236085741bc62a3f5767654722af561eff175664" +
+                "1af60e3d3959f63f0fec00cb29443ffca4ff751a76ecc6fa192ebe08ec9f643b9bb0d11bc90c1e850f0528ef223ea5f" +
+                "e4b4c107cc3a9eb26e6b84d74d87acbf7cc760cd788cbc30f95f8399077b25cdd924604c01";
+
+        String expectedCSR = "MIIC4jCCAcoCAQAwgZwxCzAJBgNVBAYTAkNOMRAwDgYDVQQIDAdCZWlqaW5nMRAwDgYDVQQHDAdCZWlqaW" +
+                "5nMQ8wDQYDVQQKDAZKRC5jb20xHjAcBgNVBAsMFUJsb2NrY2hhaW4gRGVwYXJ0bWVudDEWMBQGA1UEAwwNbGVkZ2VyLmpkL" +
+                "mNvbTEgMB4GCSqGSIb3DQEJARYRemhhbmdsaW4zM0BqZC5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDJ" +
+                "HpeIl6NrMKV9JlgHRBsO/0DFVy7PApzQyymZtxXt0tU0XHtgwAMHWxNSYp0DuUPQiyW/xSRaQA+ey8F1c5TqxFLWMWv5DPz" +
+                "/Xt/EJ+J3qlJm6JsbLaouadrVV1UV9JQXyf8zLIMNzVU3OB8I4AsREjrZR7sRsYZm0mSrXYzcktCWf9fg5md3RuLwEnDQWU" +
+                "90zaTp13TG84JEmYlr+2QkaEryYNcbV6E2a3QRBPxkfZ443gVVaNqtYMEWaG5K+h6cg+njDHIW5hNT2i91st3iwK6HDPDMy" +
+                "QSQ0eIuzMvzmF0wkzaJhH5vr5Rpk/kw+DrFuBYHV5Oppt8gcnVSohvjAgMBAAGgADANBgkqhkiG9w0BAQUFAAOCAQEALKHw" +
+                "BrlppbN+CSJwHxO99rv2XVD7L8lwwiMqdMzoNHxZUoob4AcGS3Iyxy6obX8fZh7DCA4nN0AmvrJCmWD3hCLclWKlwXTwvFe" +
+                "WIeB4xEB9MVPV6/Hs/QaI9Rjhd+O/Alfzov8y+KyYHEWmwxHj2RtQm1ZeulELzMvRjsqP+m5tOM1hLnPMU+AF1tZ9Fc7Jbm" +
+                "7Dwh6TAPpmaH1aVbHsnlZyCp8K4nMozVogcXJqg3qsbeJ6c/TofL0fURqiTJxLKMC0aD0TwVcNwDWEmc8cpqGheG1g6UF5l" +
+                "QBpeR2Br4f3LXJgr1Op1RxRy6I+X7h1IL38Q3jAOoU4y04O/+an7g==";
+
+        String expectedUserCert = "MIIERjCCAy6gAwIBAgIFIChmYJgwDQYJKoZIhvcNAQEFBQAwWTELMAkGA1UEBhMCQ04xMDAuBgNVB" +
+                "AoTJ0NoaW5hIEZpbmFuY2lhbCBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTEYMBYGA1UEAxMPQ0ZDQSBURVNUIE9DQTExMB4X" +
+                "DTE5MDgyODA2MzEyNVoXDTIxMDgyODA2MzEyNVoweDELMAkGA1UEBhMCQ04xGDAWBgNVBAoTD0NGQ0EgVEVTVCBPQ0ExMTE" +
+                "RMA8GA1UECxMITG9jYWwgUkExFTATBgNVBAsTDEluZGl2aWR1YWwtMTElMCMGA1UEAxQcMDUxQHpoYW5nbGluIUBaMTg2MT" +
+                "IyMjkyOTVANTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMkel4iXo2swpX0mWAdEGw7/QMVXLs8CnNDLKZm3F" +
+                "e3S1TRce2DAAwdbE1JinQO5Q9CLJb/FJFpAD57LwXVzlOrEUtYxa/kM/P9e38Qn4neqUmbomxstqi5p2tVXVRX0lBfJ/zMs" +
+                "gw3NVTc4HwjgCxESOtlHuxGxhmbSZKtdjNyS0JZ/1+DmZ3dG4vAScNBZT3TNpOnXdMbzgkSZiWv7ZCRoSvJg1xtXoTZrdBE" +
+                "E/GR9njjeBVVo2q1gwRZobkr6HpyD6eMMchbmE1PaL3Wy3eLArocM8MzJBJDR4i7My/OYXTCTNomEfm+vlGmT+TD4OsW4Fg" +
+                "dXk6mm3yBydVKiG+MCAwEAAaOB9TCB8jAfBgNVHSMEGDAWgBT8C7xEmg4xoYOpgYcnHgVCxr9W+DBIBgNVHSAEQTA/MD0GC" +
+                "GCBHIbvKgECMDEwLwYIKwYBBQUHAgEWI2h0dHA6Ly93d3cuY2ZjYS5jb20uY24vdXMvdXMtMTUuaHRtMDoGA1UdHwQzMDEw" +
+                "L6AtoCuGKWh0dHA6Ly8yMTAuNzQuNDIuMy9PQ0ExMS9SU0EvY3JsMjY2NTAuY3JsMAsGA1UdDwQEAwID6DAdBgNVHQ4EFgQ" +
+                "UOTy45HymVDivPwA83lRoMpShasQwHQYDVR0lBBYwFAYIKwYBBQUHAwIGCCsGAQUFBwMEMA0GCSqGSIb3DQEBBQUAA4IBAQ" +
+                "A7NFkDMV1mRV/07DJUdZJzvkm+QihhpLp7D2dUblCCEt0jjY5RdLiWG7HvJnlPTThiSkiejEO0Fy1cQzA5jYRhwp+70X8X9" +
+                "bt5jEBP/V4PyRXKKEvKZMdppLIeVI6rZk/gJzPh2FQYv3qWaINilxLOBP8Qa0kdMBwo6D6/MYwnSGv5zP4NLFUysLUJiKoM" +
+                "lAzEQSPNnkYRX6nogpkdN91/xgH3GA7fiihrjm5oxMAupCli9LQqvlUvRtv5EKIN9c+ixCAYFagG9IIjMDXbDne77n15i01" +
+                "420N8sjfTlr9v3W0v1gBSzjzFOT+TTTUtrjfO/Vm8iqq+z22QKIXgYjSF";
+
+        String issuerCert =
+                "-----BEGIN CERTIFICATE-----\n" +
+                        "MIIDzzCCAregAwIBAgIKUalCR1Mt5ZSK8jANBgkqhkiG9w0BAQUFADBZMQswCQYD\n" +
+                        "VQQGEwJDTjEwMC4GA1UEChMnQ2hpbmEgRmluYW5jaWFsIENlcnRpZmljYXRpb24g\n" +
+                        "QXV0aG9yaXR5MRgwFgYDVQQDEw9DRkNBIFRFU1QgQ1MgQ0EwHhcNMTIwODI5MDU1\n" +
+                        "NDM2WhcNMzIwODI0MDU1NDM2WjBZMQswCQYDVQQGEwJDTjEwMC4GA1UEChMnQ2hp\n" +
+                        "bmEgRmluYW5jaWFsIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MRgwFgYDVQQDEw9D\n" +
+                        "RkNBIFRFU1QgT0NBMTEwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC8\n" +
+                        "jn0n8Fp6hcRdACdn1+Y6GAkC6KGgNdKyHPrmsdmhCjnd/i4qUFwnG8cp3D4lFw1G\n" +
+                        "jmjSO5yVYbik/NbS6lbNpRgTK3fDfMFvLJpRIC+IFhG9SdAC2hwjsH9qTpL9cK2M\n" +
+                        "bSdrC6pBdDgnbzaM9AGBF4Y6vXhj5nah4ZMsBvDp19LzXjlGuTPLuAgv9ZlWknsd\n" +
+                        "RN70PIAmvomd10uqX4GIJ4Jq/FdKXOLZ2DNK/NhRyN6Yq71L3ham6tutXeZow5t5\n" +
+                        "0254AnUlo1u6SeH9F8itER653o/oMLFwp+63qXAcqrHUlOQPX+JI8fkumSqZ4F2F\n" +
+                        "t/HfVMnqdtFNCnh5+eIBAgMBAAGjgZgwgZUwHwYDVR0jBBgwFoAUdN7FjQp9EBqq\n" +
+                        "aYNbTSHOhpvMcTgwDAYDVR0TBAUwAwEB/zA4BgNVHR8EMTAvMC2gK6AphidodHRw\n" +
+                        "Oi8vMjEwLjc0LjQyLjMvdGVzdHJjYS9SU0EvY3JsMS5jcmwwCwYDVR0PBAQDAgEG\n" +
+                        "MB0GA1UdDgQWBBT8C7xEmg4xoYOpgYcnHgVCxr9W+DANBgkqhkiG9w0BAQUFAAOC\n" +
+                        "AQEAb7W0K9fZPA+JPw6lRiMDaUJ0oh052yEXreMBfoPulxkBj439qombDiFggRLc\n" +
+                        "3g8wIEKzMOzOKXTWtnzYwN3y/JQSuJb/M1QqOEEM2PZwCxI4AkBuH6jg03RjlkHg\n" +
+                        "/kTtuIFp9ItBCC2/KkKlp0ENfn4XgVg2KtAjZ7lpyVU0LPnhEqqUVY/xthjlCSa7\n" +
+                        "/XHNStRxsfCTIBUWJ8n2FZyQhfV/UkMNHDBIiJR0v6C4Ai0/290WvbPEIAq+03Si\n" +
+                        "fsHzBeA0C8lP5VzfAr6wWePaZMCpStpLaoXNcAqReKxQllElOqAhRxC5VKH+rnIQ\n" +
+                        "OMRZvB7FRyE9IfwKApngcZbA5g==\n" +
+                        "-----END CERTIFICATE-----";
+
+        byte[] rawPublicKeyBytes = Hex.decode(publicKeyStr);
+        byte[] rawPrivateKeyBytes = Hex.decode(privateKeyStr);
+
+        CSRBuilder builder = new CSRBuilder();
+        builder.init("SHA1withRSA", rawPublicKeyBytes, rawPrivateKeyBytes);
+
+        String csr = builder.buildRequest(countryName,stateName,cityName,
+                organizationName,departmentName,domainName,
+                emailName);
+
+        assertEquals(expectedCSR,csr);
+
+        CertParser parser = new CertParser();
+        parser.parse(expectedUserCert,issuerCert);
+
+        PublicKey rawPublicKeyInCert = parser.getPubKey();
+        // check that the public key in inputs and the public key in certificate are consistent
+        assertArrayEquals(rawPublicKeyBytes, rawPublicKeyInCert.getEncoded());
+
+        String algoName = parser.getSigAlgName();
+        int keyLength = parser.getKeyLength();
+        String length = String.valueOf(keyLength);
+        String algo = (algoName.contains("RSA")? (algoName + length).toUpperCase(): algoName.toUpperCase());
+
+        CryptoAlgorithm algorithm = Crypto.getAlgorithm(algo);
+        assertNotNull(algorithm);
+        SignatureFunction signatureFunction = Crypto.getSignatureFunction(algorithm);
+
+        PubKey  pubKey  = new PubKey(algorithm, rawPublicKeyBytes);
+        PrivKey privKey = new PrivKey(algorithm, rawPrivateKeyBytes);
+
+        // signTest
+        byte[] data = new byte[1024];
+        Random random = new Random();
+        random.nextBytes(data);
+
+        SignatureDigest signature = signatureFunction.sign(privKey, data);
+        assertTrue(signatureFunction.verify(signature, pubKey, data));
+    }
 }
diff --git a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA4096SignatureFunctionTest.java b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA4096SignatureFunctionTest.java
index 9444771b..466e245d 100644
--- a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA4096SignatureFunctionTest.java
+++ b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA4096SignatureFunctionTest.java
@@ -1,9 +1,13 @@
 package com.jd.blockchain.crypto.service.pki;
 
 import com.jd.blockchain.crypto.*;
+import com.jd.blockchain.crypto.utils.CSRBuilder;
+import com.jd.blockchain.crypto.utils.CertParser;
 import com.jd.blockchain.utils.io.BytesUtils;
+import org.bouncycastle.util.encoders.Hex;
 import org.junit.Test;
 
+import java.security.PublicKey;
 import java.util.Random;
 
 import static com.jd.blockchain.crypto.CryptoAlgorithm.ASYMMETRIC_KEY;
@@ -125,4 +129,186 @@ public class SHA1WITHRSA4096SignatureFunctionTest {
                 resolvedSignatureDigest.getAlgorithm());
         assertArrayEquals(signatureDigestBytes, resolvedSignatureDigest.toBytes());
     }
+
+    @Test
+    public void testWithCSRAndCert() {
+
+        String countryName = "CN";
+        String stateName = "Beijing";
+        String cityName = "Beijing";
+        String organizationName = "JD.com";
+        String departmentName = "Blockchain Department";
+        String domainName = "ledger.jd.com";
+        String emailName = "zhanglin33@jd.com";
+
+
+        String publicKeyStr =  "30820222300d06092a864886f70d01010105000382020f003082020a0282020100b40edee83b609e" +
+                "aa001f2496f95d2f3302513306ec9a8e7fce0d2e141fce7ee357a7465314c3f5f4b08cb6c95803c368ddbfedba483cb" +
+                "5c45914037ceee5783fc971a12ef9b0e4158dc379b59499eee629324a9beb350c4c10e50837345be128b91f43a03381" +
+                "758bbefe41c45712e4b5fdd5bde780167283706b24e37dd753db65b4c6b3e49cd8be825665d9a29a24b77e76473df02" +
+                "2327873555aa33ba2ffcc766cbefedc46ec868d10f817822540eaf5754c074dd6d428355ce24a058a4c9ce41e48aad5" +
+                "92e7955cf93d779d03d3acf25ae271346a9e4255e4ed902ae016032b04efbee98f43cd767653e089b37540e537aede9" +
+                "dbc04f8f1a858b2764b9eedac80b6a8da5ff02aab4be94e071c70718fde7227cdefec31600a1c55bac16f4de9dea8ab" +
+                "7824c1ec783b818dfe005f040a3f6872b1c7a6c31a66c1b06eb8d872a23d1b4fdadf9eed58f93b2a2bc145638a79a81" +
+                "904d39b22128ced18a2556c21888ed1ec8ad59bd6764f1ea16eb7f3574c53166f0827b5072d23017bd725adeb63eeb2" +
+                "29a4e78d4d7426e936753902bb51e3cd90630314f4ab41272a9e36cb668b2ba9c2ebc02e9ef0c377c88482e839f2f4d" +
+                "5c8efcfbe1280e52c6bdf80aa487ae03ff9dd9fd981f78172bc1141ce6031b0b8915658d830c696662507d3cf4ddba8" +
+                "7daabf97c15cbef58b15e84f16f879328c7c65076d94fc6b4514549831850203010001";
+
+        String privateKeyStr = "30820942020100300d06092a864886f70d01010105000482092c308209280201000282020100b40e" +
+                "dee83b609eaa001f2496f95d2f3302513306ec9a8e7fce0d2e141fce7ee357a7465314c3f5f4b08cb6c95803c368ddb" +
+                "fedba483cb5c45914037ceee5783fc971a12ef9b0e4158dc379b59499eee629324a9beb350c4c10e50837345be128b9" +
+                "1f43a03381758bbefe41c45712e4b5fdd5bde780167283706b24e37dd753db65b4c6b3e49cd8be825665d9a29a24b77" +
+                "e76473df022327873555aa33ba2ffcc766cbefedc46ec868d10f817822540eaf5754c074dd6d428355ce24a058a4c9c" +
+                "e41e48aad592e7955cf93d779d03d3acf25ae271346a9e4255e4ed902ae016032b04efbee98f43cd767653e089b3754" +
+                "0e537aede9dbc04f8f1a858b2764b9eedac80b6a8da5ff02aab4be94e071c70718fde7227cdefec31600a1c55bac16f" +
+                "4de9dea8ab7824c1ec783b818dfe005f040a3f6872b1c7a6c31a66c1b06eb8d872a23d1b4fdadf9eed58f93b2a2bc14" +
+                "5638a79a81904d39b22128ced18a2556c21888ed1ec8ad59bd6764f1ea16eb7f3574c53166f0827b5072d23017bd725" +
+                "adeb63eeb229a4e78d4d7426e936753902bb51e3cd90630314f4ab41272a9e36cb668b2ba9c2ebc02e9ef0c377c8848" +
+                "2e839f2f4d5c8efcfbe1280e52c6bdf80aa487ae03ff9dd9fd981f78172bc1141ce6031b0b8915658d830c696662507" +
+                "d3cf4ddba87daabf97c15cbef58b15e84f16f879328c7c65076d94fc6b451454983185020301000102820200063fece" +
+                "3452a579f817513454d3efb842afcac077dbf689a4d89de13533e4cdfb1bb6be0b6dc0d65b29a13bf1dd7b598e67782" +
+                "b6204b4128e149a54c59136c6ed45c661296169a78180d54a46595c939c26ccd33a7c095de6f08b01610726ef885a26" +
+                "cebbad5efc14bbe1204d15be5c5de5b64a5cc279b4e6e20bded4a8126973b2ac0e9de11c6a1282f7d060693909a30e0" +
+                "c49cc500bedd38ed99c18830a26dd39f772aabf527410d54ed338db022d674f21f1332d3b5d5f67234a58a97300d130" +
+                "aed0d46effc2b4e4895665934188d0c75749e26ca5b97645957989530657b332b4ef202b3d70fe2e07d0d526240fbe1" +
+                "68e320357be0f54e18008a233a8137e23ca1c54074b31c57eebee49bf2f1c66ea97a2c846a8d26680b97e1240d6763e" +
+                "60bcd8d696c806362b18bf0504a39e4d465a9548091dbe97c36f6d8e038d95a72c0a88ff524dc81fe0ed2afd69f4251" +
+                "1a90687a4c632c812234a19a7312b2dea3fcd4515800eca700733b0f83509184fe8d3cd21385f0ef0cec37c433d354f" +
+                "aed61662a62902c8708c81e2af20898f649c1bafd600baa0409c943cf82bc90ea20a8972da7ab3a252f4f08df2509de" +
+                "e1dacfe787eef4d60c0c92ec7a3c6277d7be39deed7704ac721d8efd138a410d632a32535142cf977b09d9fb680bc96" +
+                "c538c00440d5e1ed71f8510e6524e564d69a24d03f1a9a0c326b421e32550801c890282010100e8d72f8f1fbeada724" +
+                "3e6df25337a2e7fc43e3d4f39877f89abb3b5e453f20f339a1f35e0a2847122f0bd835e6b43fd276f447da04f85cfca" +
+                "0fa8bf49b313239e36f9595ef1bfb9b8247bf01cc407dfc444421161a5b2e96d4d1d90cea185945e9447d21a2d8a461" +
+                "f43dff9ba58043feeb49552a3bf2472eea59b2aa8631048c76a15898065be0ef957d4802c827e30339d66ad7aed5851" +
+                "a5896f12d33f45800dcb10859531c590af7a75e9fa81f1d937a287fb6b066d58720584af2ae161e083681655ae77f48" +
+                "34bfe0accf1d12bbdd8c2644f78b207cfcb2dedf9fe7d29e1ae5c2a5623f5a1770db27d2636450c79fd39bce39f009b" +
+                "598e0298e1f77bf8d3d0282010100c5f7af9258a42da93204cecb71c544397bc16691cf0d41308fbd3b88eca7d101d1" +
+                "377dfe3b7e66707d3e5543b21033ab6c5b0de577740c6e335f512eeb2a839c3f2baeca4ce80e3fbd8fb93fa983e1719" +
+                "5c5fee63bc163df334a80f2767871e3434adc0bc7030dea44fce414a08da7e918e6f030cfb20b2d29033e9ef1be3e08" +
+                "ef1f50df0c9325a20ff01d0b7a06761403ae3498aea8bad93110d61a6386d470e630990029e2cb098de40fafa330911" +
+                "6c3c6de180b7fa41ae14553e891148ab53e970ce372b1777826983baaccac08290e343761d8daa2505f1dc45b8511a3" +
+                "6e2d0909237be9ae7ebbaa00b31de1224f32959e4e6f3428140ca8e1e5580789e902820100674075609c8d2be880940" +
+                "6a17cf1a1160ab1f8684895862e023fa0f60ef30da38e1d1914cca04bd3ee74ec2e0ade47a70705108fc7c0734bbbff" +
+                "1eed1b9cd74f00624d0d2df954bc032bd9b1ec6774f6d736f70d1c26ef2407bffee65130f6f59f99b57ba3013af40d2" +
+                "12926565fe8c734835276e61a6c228bddb6f3138acd1f94c3bbcbbe9623cb5a9931c3ba0aa60a9a2d5137cfd9f3aa59" +
+                "3aa63c8b5b8162f07ab8df1391f092827bffe400e3bb73d8a9f8e88495357f3482b2c9a7153bc01c9b88dca4e7b6975" +
+                "db73e2aa213daa7462cfa4c63afc67d30bcd0a1d2657da323dc0b06e45d09240cab3e0ac1436922a0ede8a79ca0519d" +
+                "375a7621d23269690282010100bbc1299716d2bf2b94f0d260494ada65da6596adfb3d8af24fa11d71c36175eccf4c5" +
+                "e065cce88c16f474afea546907aa88dc3243aa2a9976ac99fe96bc82a8269b738534d9558ce432ea87724829bb26a66" +
+                "1a56a99dc4e6cf727dd17762cc40ca759934e24e9747f49e14832bb2ade97960adb4dd86f2eaa5d719f10d3d6d00742" +
+                "9b33d98638671a9c40507f9775f4da41ff86a465c68b9ccbb371458086c3b9755c8064bb378f55ac94dc73a72b96869" +
+                "cd969e1f69b36e7af091a024d8e2a4faf3af999811904937f171c58fd028fd272786cf1a286180f074fee1fdd6b8b5a" +
+                "9a8c42e0f3b95ef4474fbace54dbc887865467b0524e64dfda3be7b117e34e1028201001a7e846231c34400c1f704e7" +
+                "fec6e46c87d61f269b71942bc9cc72005ba30eea3db5d0e5b0b754f7a00b96c883399982b5b3a9916765c5ed9129e44" +
+                "a791ce6892f85758c637bc040da132b8f0cd0ac36ba3aae9334414a77f0b50c0aa03643bfd59b9a621342a4807e46fc" +
+                "52a5a12fd3ff6762e181c40c2baf3653043c836b14700463af5d68a2a2897897edb5f217d655d5bcd24e7910062f40e" +
+                "00f19e2f94b45efbbf60cbf734830756baf72dcfca8d2858ca5df63336999474945f3744a96e4ce23f9067bbca849ef" +
+                "1048cba3a4aad73ed73b0fcd8c2e9f6d06aa768548d7107aa58d9d296f853543f6569e4dd33270540d983460773794f" +
+                "e9196fc5a54cd";
+
+        String expectedCSR = "MIIE4jCCAsoCAQAwgZwxCzAJBgNVBAYTAkNOMRAwDgYDVQQIDAdCZWlqaW5nMRAwDgYDVQQHDAdCZWlqaW" +
+                "5nMQ8wDQYDVQQKDAZKRC5jb20xHjAcBgNVBAsMFUJsb2NrY2hhaW4gRGVwYXJ0bWVudDEWMBQGA1UEAwwNbGVkZ2VyLmpkL" +
+                "mNvbTEgMB4GCSqGSIb3DQEJARYRemhhbmdsaW4zM0BqZC5jb20wggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQC0" +
+                "Dt7oO2CeqgAfJJb5XS8zAlEzBuyajn/ODS4UH85+41enRlMUw/X0sIy2yVgDw2jdv+26SDy1xFkUA3zu5Xg/yXGhLvmw5BW" +
+                "Nw3m1lJnu5ikySpvrNQxMEOUINzRb4Si5H0OgM4F1i77+QcRXEuS1/dW954AWcoNwayTjfddT22W0xrPknNi+glZl2aKaJL" +
+                "d+dkc98CIyeHNVWqM7ov/Mdmy+/txG7IaNEPgXgiVA6vV1TAdN1tQoNVziSgWKTJzkHkiq1ZLnlVz5PXedA9Os8lricTRqn" +
+                "kJV5O2QKuAWAysE777pj0PNdnZT4ImzdUDlN67enbwE+PGoWLJ2S57trIC2qNpf8CqrS+lOBxxwcY/ecifN7+wxYAocVbrB" +
+                "b03p3qireCTB7Hg7gY3+AF8ECj9ocrHHpsMaZsGwbrjYcqI9G0/a357tWPk7KivBRWOKeagZBNObIhKM7RiiVWwhiI7R7Ir" +
+                "Vm9Z2Tx6hbrfzV0xTFm8IJ7UHLSMBe9clretj7rIppOeNTXQm6TZ1OQK7UePNkGMDFPSrQScqnjbLZosrqcLrwC6e8MN3yI" +
+                "SC6Dny9NXI78++EoDlLGvfgKpIeuA/+d2f2YH3gXK8EUHOYDGwuJFWWNgwxpZmJQfTz03bqH2qv5fBXL71ixXoTxb4eTKMf" +
+                "GUHbZT8a0UUVJgxhQIDAQABoAAwDQYJKoZIhvcNAQEFBQADggIBAKowJTG9mZLbDHRndmDUd7PWrq1AiCdk6DStV39B/REF" +
+                "OrMYcW9X4Ak69fhXQDtD4gu2lKtumDY0oJ8xleM2FHUSzdooTWb7P/QtCIBy27sH6nvlefRWi7ngSTNJlDmwgr0l07UzZU1" +
+                "Yl/ZULn0XlNAFal+qt+4ZNdiulNwkL6IofXV/8vqOeQw5iICDBYHItyY/mqD8IIaClVd8yNpEuE/W9GdJIDNXQjpug+BxL/" +
+                "FbjAs6P3ZzJboedJE5urbru2jjb7atl3w/eDo4r6+XNSD8d1PgVmVhzN2WpUWsZNeH2jd9AA6436GjsBssgSRKEc3FTJ+lO" +
+                "0Jw2d8GewXXkIv8CT4L3BFwqZhGQt27wlb87+W4dIC05JIaJx52869dvu1ky1CL73GROXeS8rVYJsPwVmK2xy3QTaeHGEQh" +
+                "kiVNeV1cc3mll2z7fgbkjPD8zDNBWUdzSXQMzecY1CBD02iz6LaHfvkI7gXXoiIf1cJrnLtYhv3lG45jKr0E45/Wn7oXmYk" +
+                "RM4/zHO4KnY7Pp3b3QTgkRJaPnZiG7aiCrdnTIopDSGpTWSPWDLjgwgaCPPz5Pd2Fk+SAE98o7Cu8O0vxMASpd4liaedASE" +
+                "n6hnrvcTkFLLG2ecZzJZ0aEqPi4es0FqlqVZrLPH2UYpECgfhkGQQKAx4eRTAZFhz1GSkd";
+
+        String expectedUserCert = "MIIFRjCCBC6gAwIBAgIFIChmYWIwDQYJKoZIhvcNAQEFBQAwWTELMAkGA1UEBhMCQ04xMDAuBgNVB" +
+                "AoTJ0NoaW5hIEZpbmFuY2lhbCBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTEYMBYGA1UEAxMPQ0ZDQSBURVNUIE9DQTExMB4X" +
+                "DTE5MDgyODA4MDAxMVoXDTIxMDgyODA4MDAxMVoweDELMAkGA1UEBhMCQ04xGDAWBgNVBAoTD0NGQ0EgVEVTVCBPQ0ExMTE" +
+                "RMA8GA1UECxMITG9jYWwgUkExFTATBgNVBAsTDEluZGl2aWR1YWwtMTElMCMGA1UEAxQcMDUxQHpoYW5nbGluIUBaMTg2MT" +
+                "IyMjkyOTVANzCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBALQO3ug7YJ6qAB8klvldLzMCUTMG7JqOf84NLhQfz" +
+                "n7jV6dGUxTD9fSwjLbJWAPDaN2/7bpIPLXEWRQDfO7leD/JcaEu+bDkFY3DebWUme7mKTJKm+s1DEwQ5Qg3NFvhKLkfQ6Az" +
+                "gXWLvv5BxFcS5LX91b3ngBZyg3BrJON911PbZbTGs+Sc2L6CVmXZopokt352Rz3wIjJ4c1Vaozui/8x2bL7+3Ebsho0Q+Be" +
+                "CJUDq9XVMB03W1Cg1XOJKBYpMnOQeSKrVkueVXPk9d50D06zyWuJxNGqeQlXk7ZAq4BYDKwTvvumPQ812dlPgibN1QOU3rt" +
+                "6dvAT48ahYsnZLnu2sgLao2l/wKqtL6U4HHHBxj95yJ83v7DFgChxVusFvTeneqKt4JMHseDuBjf4AXwQKP2hyscemwxpmw" +
+                "bBuuNhyoj0bT9rfnu1Y+TsqK8FFY4p5qBkE05siEoztGKJVbCGIjtHsitWb1nZPHqFut/NXTFMWbwgntQctIwF71yWt62Pu" +
+                "simk541NdCbpNnU5ArtR482QYwMU9KtBJyqeNstmiyupwuvALp7ww3fIhILoOfL01cjvz74SgOUsa9+Aqkh64D/53Z/Zgfe" +
+                "BcrwRQc5gMbC4kVZY2DDGlmYlB9PPTduofaq/l8FcvvWLFehPFvh5Mox8ZQdtlPxrRRRUmDGFAgMBAAGjgfUwgfIwHwYDVR" +
+                "0jBBgwFoAU/Au8RJoOMaGDqYGHJx4FQsa/VvgwSAYDVR0gBEEwPzA9BghggRyG7yoBAjAxMC8GCCsGAQUFBwIBFiNodHRwO" +
+                "i8vd3d3LmNmY2EuY29tLmNuL3VzL3VzLTE1Lmh0bTA6BgNVHR8EMzAxMC+gLaArhilodHRwOi8vMjEwLjc0LjQyLjMvT0NB" +
+                "MTEvUlNBL2NybDI2NjU1LmNybDALBgNVHQ8EBAMCA+gwHQYDVR0OBBYEFBl1Gmb89bqbEKyFcTU3eOY/5NmKMB0GA1UdJQQ" +
+                "WMBQGCCsGAQUFBwMCBggrBgEFBQcDBDANBgkqhkiG9w0BAQUFAAOCAQEADEU//9rnWN1s3/ariMHIUmgzRUdz3fWYiDRzGC" +
+                "mcnnETlXDstGmoYmwCM+QwHw6cyKXkwkg9zV7c7CgM471ZuF00gq115d432Ps3RXGCpfQ2fn3gs+91ky/YqJOOyBb8KL0IP" +
+                "r/Zh56/y3XX0gORn4GLqaj+oVZrFcmKrPtVhySlXNiD5BRMq39mUbuLBweGsgNVQ9VxiWc8ZBGjlJ6OVsngbvWrtl3zgkKb" +
+                "X9lhr8Bxq3G+jOV8jvr1Dkn4a65g2TWcFquxmPvRc5UwN29CimbC7RViCL3Jp+zrGasqbjycuqu5eSXb6gG4/aV0/K9yn5k" +
+                "YlZMIBlbsXSEi5J26pg==";
+
+        String issuerCert =
+                "-----BEGIN CERTIFICATE-----\n" +
+                        "MIIDzzCCAregAwIBAgIKUalCR1Mt5ZSK8jANBgkqhkiG9w0BAQUFADBZMQswCQYD\n" +
+                        "VQQGEwJDTjEwMC4GA1UEChMnQ2hpbmEgRmluYW5jaWFsIENlcnRpZmljYXRpb24g\n" +
+                        "QXV0aG9yaXR5MRgwFgYDVQQDEw9DRkNBIFRFU1QgQ1MgQ0EwHhcNMTIwODI5MDU1\n" +
+                        "NDM2WhcNMzIwODI0MDU1NDM2WjBZMQswCQYDVQQGEwJDTjEwMC4GA1UEChMnQ2hp\n" +
+                        "bmEgRmluYW5jaWFsIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MRgwFgYDVQQDEw9D\n" +
+                        "RkNBIFRFU1QgT0NBMTEwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC8\n" +
+                        "jn0n8Fp6hcRdACdn1+Y6GAkC6KGgNdKyHPrmsdmhCjnd/i4qUFwnG8cp3D4lFw1G\n" +
+                        "jmjSO5yVYbik/NbS6lbNpRgTK3fDfMFvLJpRIC+IFhG9SdAC2hwjsH9qTpL9cK2M\n" +
+                        "bSdrC6pBdDgnbzaM9AGBF4Y6vXhj5nah4ZMsBvDp19LzXjlGuTPLuAgv9ZlWknsd\n" +
+                        "RN70PIAmvomd10uqX4GIJ4Jq/FdKXOLZ2DNK/NhRyN6Yq71L3ham6tutXeZow5t5\n" +
+                        "0254AnUlo1u6SeH9F8itER653o/oMLFwp+63qXAcqrHUlOQPX+JI8fkumSqZ4F2F\n" +
+                        "t/HfVMnqdtFNCnh5+eIBAgMBAAGjgZgwgZUwHwYDVR0jBBgwFoAUdN7FjQp9EBqq\n" +
+                        "aYNbTSHOhpvMcTgwDAYDVR0TBAUwAwEB/zA4BgNVHR8EMTAvMC2gK6AphidodHRw\n" +
+                        "Oi8vMjEwLjc0LjQyLjMvdGVzdHJjYS9SU0EvY3JsMS5jcmwwCwYDVR0PBAQDAgEG\n" +
+                        "MB0GA1UdDgQWBBT8C7xEmg4xoYOpgYcnHgVCxr9W+DANBgkqhkiG9w0BAQUFAAOC\n" +
+                        "AQEAb7W0K9fZPA+JPw6lRiMDaUJ0oh052yEXreMBfoPulxkBj439qombDiFggRLc\n" +
+                        "3g8wIEKzMOzOKXTWtnzYwN3y/JQSuJb/M1QqOEEM2PZwCxI4AkBuH6jg03RjlkHg\n" +
+                        "/kTtuIFp9ItBCC2/KkKlp0ENfn4XgVg2KtAjZ7lpyVU0LPnhEqqUVY/xthjlCSa7\n" +
+                        "/XHNStRxsfCTIBUWJ8n2FZyQhfV/UkMNHDBIiJR0v6C4Ai0/290WvbPEIAq+03Si\n" +
+                        "fsHzBeA0C8lP5VzfAr6wWePaZMCpStpLaoXNcAqReKxQllElOqAhRxC5VKH+rnIQ\n" +
+                        "OMRZvB7FRyE9IfwKApngcZbA5g==\n" +
+                        "-----END CERTIFICATE-----";
+
+        byte[] rawPublicKeyBytes = Hex.decode(publicKeyStr);
+        byte[] rawPrivateKeyBytes = Hex.decode(privateKeyStr);
+
+        CSRBuilder builder = new CSRBuilder();
+        builder.init("SHA1withRSA", rawPublicKeyBytes, rawPrivateKeyBytes);
+
+        String csr = builder.buildRequest(countryName,stateName,cityName,
+                organizationName,departmentName,domainName,
+                emailName);
+
+        assertEquals(expectedCSR,csr);
+
+        CertParser parser = new CertParser();
+        parser.parse(expectedUserCert,issuerCert);
+
+        PublicKey rawPublicKeyInCert = parser.getPubKey();
+        // check that the public key in inputs and the public key in certificate are consistent
+        assertArrayEquals(rawPublicKeyBytes, rawPublicKeyInCert.getEncoded());
+
+        String algoName = parser.getSigAlgName();
+        int keyLength = parser.getKeyLength();
+        String length = String.valueOf(keyLength);
+        String algo = (algoName.contains("RSA")? (algoName + length).toUpperCase(): algoName.toUpperCase());
+
+        CryptoAlgorithm algorithm = Crypto.getAlgorithm(algo);
+        assertNotNull(algorithm);
+        SignatureFunction signatureFunction = Crypto.getSignatureFunction(algorithm);
+
+        PubKey  pubKey  = new PubKey(algorithm, rawPublicKeyBytes);
+        PrivKey privKey = new PrivKey(algorithm, rawPrivateKeyBytes);
+
+        // signTest
+        byte[] data = new byte[1024];
+        Random random = new Random();
+        random.nextBytes(data);
+
+        SignatureDigest signature = signatureFunction.sign(privKey, data);
+        assertTrue(signatureFunction.verify(signature, pubKey, data));
+    }
 }
diff --git a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SM3WITHSM2SignatureFunctionTest.java b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SM3WITHSM2SignatureFunctionTest.java
index 0b8063a9..54969745 100644
--- a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SM3WITHSM2SignatureFunctionTest.java
+++ b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SM3WITHSM2SignatureFunctionTest.java
@@ -1,9 +1,13 @@
 package com.jd.blockchain.crypto.service.pki;
 
 import com.jd.blockchain.crypto.*;
+import com.jd.blockchain.crypto.utils.CSRBuilder;
+import com.jd.blockchain.crypto.utils.CertParser;
 import com.jd.blockchain.utils.io.BytesUtils;
+import org.bouncycastle.util.encoders.Hex;
 import org.junit.Test;
 
+import java.security.PublicKey;
 import java.util.Random;
 
 import static com.jd.blockchain.crypto.CryptoAlgorithm.ASYMMETRIC_KEY;
@@ -270,4 +274,80 @@ public class SM3WITHSM2SignatureFunctionTest {
                 resolvedSignatureDigest.getAlgorithm());
         assertArrayEquals(signatureDigestBytes, resolvedSignatureDigest.toBytes());
     }
+
+
+    @Test
+    public void testWithCSRAndCert() {
+
+        String publicKeyStr =  "3059301306072a8648ce3d020106082a811ccf5501822d03420004aa6586478be879504fdd02892f" +
+                "b4cf2bdb3d96a316f41ff7bcadfabef4ea836678984f9ba6931a609391426ca7164592f5fccd062be56fc32b3eec3a5" +
+                "0400971";
+
+        String privateKeyStr = "308193020100301306072a8648ce3d020106082a811ccf5501822d0479307702010104207abd2953" +
+                "84f193abe4f3715c26bc15225061f007131755d94ca12c7e0ce0b3a0a00a06082a811ccf5501822da14403420004aa6" +
+                "586478be879504fdd02892fb4cf2bdb3d96a316f41ff7bcadfabef4ea836678984f9ba6931a609391426ca7164592f5" +
+                "fccd062be56fc32b3eec3a50400971";
+
+        String expectedUserCert = "MIICwjCCAmWgAwIBAgIFIChnMlIwDAYIKoEcz1UBg3UFADBdMQswCQYDVQQGEwJDTjEwMC4GA1UEC" +
+                "gwnQ2hpbmEgRmluYW5jaWFsIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MRwwGgYDVQQDDBNDRkNBIFRFU1QgU00yIE9DQTEx" +
+                "MB4XDTE5MDgyODA4MTUzNloXDTIxMDgyODA4MTUzNloweDELMAkGA1UEBhMCQ04xGDAWBgNVBAoMD0NGQ0EgVEVTVCBPQ0E" +
+                "xMTERMA8GA1UECwwITG9jYWwgUkExFTATBgNVBAsMDEluZGl2aWR1YWwtMTElMCMGA1UEAwwcMDUxQHpoYW5nbGluIUBaMT" +
+                "g2MTIyMjkyOTVAODBZMBMGByqGSM49AgEGCCqBHM9VAYItA0IABKplhkeL6HlQT90CiS+0zyvbPZajFvQf97yt+r706oNme" +
+                "JhPm6aTGmCTkUJspxZFkvX8zQYr5W/DKz7sOlBACXGjgfQwgfEwHwYDVR0jBBgwFoAUvqZ+TT18j6BV5sEvCS4sIEOzQn8w" +
+                "SAYDVR0gBEEwPzA9BghggRyG7yoBAjAxMC8GCCsGAQUFBwIBFiNodHRwOi8vd3d3LmNmY2EuY29tLmNuL3VzL3VzLTE1Lmh" +
+                "0bTA5BgNVHR8EMjAwMC6gLKAqhihodHRwOi8vMjEwLjc0LjQyLjMvT0NBMTEvU00yL2NybDI0OTkuY3JsMAsGA1UdDwQEAw" +
+                "ID6DAdBgNVHQ4EFgQU07tMtbs5PWkwN33OQVH116xd1kowHQYDVR0lBBYwFAYIKwYBBQUHAwIGCCsGAQUFBwMEMAwGCCqBH" +
+                "M9VAYN1BQADSQAwRgIhAPuuInppVhugw6EIG4wgkouxX/MX2dTLe478wx7LFXSQAiEAneiz51vrurICNCfeecaBHgzaj7+3" +
+                "kmrdIZJBoxYGbso=";
+
+        String issuerCert =
+                "-----BEGIN CERTIFICATE-----\n" +
+                        "MIICTzCCAfOgAwIBAgIKJFSZ4SRVDndYUTAMBggqgRzPVQGDdQUAMF0xCzAJBgNV\n" +
+                        "BAYTAkNOMTAwLgYDVQQKDCdDaGluYSBGaW5hbmNpYWwgQ2VydGlmaWNhdGlvbiBB\n" +
+                        "dXRob3JpdHkxHDAaBgNVBAMME0NGQ0EgVEVTVCBDUyBTTTIgQ0EwHhcNMTIwODI5\n" +
+                        "MDU0ODQ3WhcNMzIwODI0MDU0ODQ3WjBdMQswCQYDVQQGEwJDTjEwMC4GA1UECgwn\n" +
+                        "Q2hpbmEgRmluYW5jaWFsIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MRwwGgYDVQQD\n" +
+                        "DBNDRkNBIFRFU1QgU00yIE9DQTExMFkwEwYHKoZIzj0CAQYIKoEcz1UBgi0DQgAE\n" +
+                        "L1mx4wriQUojGsIkNL14kslv9nwiqsiVpELOZauzghrbccNlPYKNYKZOCvXwIIqU\n" +
+                        "9QY02d4weqKqo/JMcNsKEaOBmDCBlTAfBgNVHSMEGDAWgBS12JBvXPDYM9JjvX6y\n" +
+                        "w43GTxJ6YTAMBgNVHRMEBTADAQH/MDgGA1UdHwQxMC8wLaAroCmGJ2h0dHA6Ly8y\n" +
+                        "MTAuNzQuNDIuMy90ZXN0cmNhL1NNMi9jcmwxLmNybDALBgNVHQ8EBAMCAQYwHQYD\n" +
+                        "VR0OBBYEFL6mfk09fI+gVebBLwkuLCBDs0J/MAwGCCqBHM9VAYN1BQADSAAwRQIh\n" +
+                        "AKuk7s3eYCZDck5NWU0eNQmLhBN/1zmKs517qFrDrkJWAiAP4cVfLtdza/OkwU9P\n" +
+                        "PrIDl+E4aL3FypntFXHG3T+Keg==\n" +
+                        "-----END CERTIFICATE-----";
+
+        byte[] rawPublicKeyBytes = Hex.decode(publicKeyStr);
+        byte[] rawPrivateKeyBytes = Hex.decode(privateKeyStr);
+
+        CSRBuilder builder = new CSRBuilder();
+        builder.init("SM3withSM2", rawPublicKeyBytes, rawPrivateKeyBytes);
+
+        CertParser parser = new CertParser();
+        parser.parse(expectedUserCert,issuerCert);
+
+        PublicKey rawPublicKeyInCert = parser.getPubKey();
+        // check that the public key in inputs and the public key in certificate are consistent
+        assertArrayEquals(rawPublicKeyBytes, rawPublicKeyInCert.getEncoded());
+
+        String algoName = parser.getSigAlgName();
+        int keyLength = parser.getKeyLength();
+        String length = String.valueOf(keyLength);
+        String algo = (algoName.contains("RSA")? (algoName + length).toUpperCase(): algoName.toUpperCase());
+
+        CryptoAlgorithm algorithm = Crypto.getAlgorithm(algo);
+        assertNotNull(algorithm);
+        SignatureFunction signatureFunction = Crypto.getSignatureFunction(algorithm);
+
+        PubKey  pubKey  = new PubKey(algorithm, rawPublicKeyBytes);
+        PrivKey privKey = new PrivKey(algorithm, rawPrivateKeyBytes);
+
+        // signTest
+        byte[] data = new byte[1024];
+        Random random = new Random();
+        random.nextBytes(data);
+
+        SignatureDigest signature = signatureFunction.sign(privKey, data);
+        assertTrue(signatureFunction.verify(signature, pubKey, data));
+    }
 }
diff --git a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/utils/CertParserTest.java b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/utils/CertParserTest.java
index 24cdc414..263d3e88 100644
--- a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/utils/CertParserTest.java
+++ b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/utils/CertParserTest.java
@@ -43,7 +43,8 @@ public class CertParserTest {
         String userCert = "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";
 
         parser.parse(userCert, issuerCert);
-        assertEquals("SHA1WITHRSA",parser.getSigAlgName());
+        assertEquals("SHA1WITHRSA", parser.getSigAlgName());
+        assertEquals(2048, parser.getKeyLength());
     }
 
     @Test
@@ -77,7 +78,8 @@ public class CertParserTest {
         String userCert = "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";
 
         parser.parse(userCert, issuerCert);
-        assertEquals("SHA1WITHRSA",parser.getSigAlgName());
+        assertEquals("SHA1WITHRSA", parser.getSigAlgName());
+        assertEquals(4096, parser.getKeyLength());
     }
 
     @Test
@@ -103,7 +105,8 @@ public class CertParserTest {
         String userCert = "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";
 
         parser.parse(userCert, issuerCert);
-        assertEquals("SM3WITHSM2",parser.getSigAlgName());
+        assertEquals("SM3WITHSM2", parser.getSigAlgName());
+        assertEquals(256, parser.getKeyLength());
     }
 
     @Test
@@ -141,6 +144,7 @@ public class CertParserTest {
                 "PrIDl+E4aL3FypntFXHG3T+Keg==\n" +
                 "-----END CERTIFICATE-----";
         parser.parse(issuerCert, CACert);
-        assertEquals("SM3WITHSM2",parser.getSigAlgName());
+        assertEquals("SM3WITHSM2", parser.getSigAlgName());
+        assertEquals(256, parser.getKeyLength());
     }
 }
diff --git a/source/crypto/crypto-sm/src/main/java/com/jd/blockchain/crypto/utils/sm/SM2Utils.java b/source/crypto/crypto-sm/src/main/java/com/jd/blockchain/crypto/utils/sm/SM2Utils.java
index 94c0cf32..b3a65b18 100644
--- a/source/crypto/crypto-sm/src/main/java/com/jd/blockchain/crypto/utils/sm/SM2Utils.java
+++ b/source/crypto/crypto-sm/src/main/java/com/jd/blockchain/crypto/utils/sm/SM2Utils.java
@@ -13,6 +13,8 @@ import org.bouncycastle.crypto.engines.SM2Engine;
 import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
 import org.bouncycastle.crypto.params.*;
 import org.bouncycastle.crypto.signers.SM2Signer;
+import org.bouncycastle.jce.ECNamedCurveTable;
+import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
 import org.bouncycastle.math.ec.*;
 
 import java.io.IOException;
@@ -29,19 +31,10 @@ public class SM2Utils {
     // The length of sm3 output is 32 bytes
     private static final int SM3DIGEST_LENGTH = 32;
 
-    private static final BigInteger SM2_P = new BigInteger("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF", 16);
-    private static final BigInteger SM2_A = new BigInteger("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC", 16);
-    private static final BigInteger SM2_B = new BigInteger("28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93", 16);
-    private static final BigInteger SM2_N = new BigInteger("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123", 16);
-    private static final BigInteger SM2_H = ECConstants.ONE;
-    private static final BigInteger SM2_GX = new BigInteger("32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7", 16);
-    private static final BigInteger SM2_GY = new BigInteger("BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0", 16);
-
-    // To get the curve from the equation y^2=x^3+ax+b according the coefficient a and b,
-    // with the big prime p, the order n, the cofactor h, and obtain the generator g and the domain's parameters
-    private static final ECCurve CURVE = new ECCurve.Fp(SM2_P, SM2_A, SM2_B, SM2_N, SM2_H);
-    private static final ECPoint G = CURVE.createPoint(SM2_GX, SM2_GY);
-    private static final ECDomainParameters DOMAIN_PARAMS = new ECDomainParameters(CURVE, G, SM2_N);
+    private static final ECNamedCurveParameterSpec PARAMS = ECNamedCurveTable.getParameterSpec("sm2p256v1");
+    private static final ECCurve CURVE = PARAMS.getCurve();
+    private static final ECDomainParameters DOMAIN_PARAMS = new ECDomainParameters(
+            CURVE, PARAMS.getG(), PARAMS.getN(), PARAMS.getH());
 
 
     //-----------------Key Generation Algorithm-----------------