FAQ

This topic provides solutions to common problems in the current Java SDK version for your reference. To use error codes to locate faults, see Error code description.

Note: If the SERVICE_TX_WAITING_VERIFY=413 or SERVICE_TX_WAITING_EXECUTE=414 error code is returned when you send a transaction, call the receipt query API to locate the problem.

user.key loading failure with an “illegal key size” error

Runtime error:

 

  
09:49:40.623 [main] ERROR com.github.lyd.msg.provider.DemoSample - unable to read private key,wrong password? errorCode :{MychainSdkErrorCodeEnum{errorCode='30001', errorDesc='sdk invalid private key'}}
  
09:49:40.626 [main] ERROR com.github.lyd.msg.provider.DemoSample - unable to read encrypted data: 1.2.840.113549.1.12.1.3 not available: Illegal key size or default parameters
  
Exception in thread "main" com.alipay.mychain.sdk.exceptions.MychainSdkException: unable to read encrypted data: 1.2.840.113549.1.12.1.3 not available: Illegal key size or default parameters
 

Solution:

The default configuration of a specific JDK limits the key length, so the SDK fails to decrypt the key file when loading it. As a result, the error occurs.

To resolve the problem, add a code segment to the beginning of the main function in DemoSample.java, as shown below.

 

  
String errorString = "Failed to modify key-length permissions";
  
    int newMaxKeyLength;
  
    try {
  
        if ((newMaxKeyLength = Cipher.getMaxAllowedKeyLength("AES")) < 256) {
  
            System.out.println("will modify aes length");
  
            Class c = Class.forName("javax.crypto.CryptoAllPermissionCollection");
  
            Constructor con = c.getDeclaredConstructor();
  
            con.setAccessible(true);
  
            Object allPermissionCollection = con.newInstance();
  
            Field f = c.getDeclaredField("all_allowed");
  
            f.setAccessible(true);
  
            f.setBoolean(allPermissionCollection, true);
  
            c = Class.forName("javax.crypto.CryptoPermissions");
  
            con = c.getDeclaredConstructor();
  
            con.setAccessible(true);
  
            Object allPermissions = con.newInstance();
  
            f = c.getDeclaredField("perms");
  
            f.setAccessible(true);
  
            ((Map) f.get(allPermissions)).put("*", allPermissionCollection);
  
            c = Class.forName("javax.crypto.JceSecurityManager");
  
            f = c.getDeclaredField("defaultPolicy");
  
            f.setAccessible(true);
  
            Field mf = Field.class.getDeclaredField("modifiers");
  
            mf.setAccessible(true);
  
            mf.setInt(f, f.getModifiers() & ~Modifier.FINAL);
  
            f.set(null, allPermissions);
  
            newMaxKeyLength = Cipher.getMaxAllowedKeyLength("AES");
  
        }
  
    } catch (Exception e) {
  
        throw new RuntimeException(errorString, e);
  
    }
  
    if (newMaxKeyLength < 256) {
  
        throw new RuntimeException(errorString);
  
    }