Encrypt and Decrypt in salesforce using apex and vf page


<apex:page standardController="EnCrypt_Decrypt__c" extensions="EncryptExtensioncls">
    <apex:form >
        <apex:pageBlock >
            <apex:pageBlockSection >
                <apex:inputField value="{!encrypt.Name}"/>
                <apex:commandButton value="Save" action="{!Save}"/>
                <apex:commandButton value="Update" action="{!test}"/>
            </apex:pageBlockSection>
        </apex:pageBlock>
    </apex:form>
</apex:page>

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public class EncryptExtensioncls{
    public EnCrypt_Decrypt__c encrypt{get;set;}
    
    //Blob cryptoKey;
    Blob cryptoKey = Blob.valueOf('51266ysaj6671678');
   
    public Id recordId{get;set;}
    public EncryptExtensioncls(ApexPages.StandardController controller) {
        //cryptoKey = Crypto.generateAesKey(256);
        recordId = Apexpages.CurrentPage().getParameters().get('id');
        if(recordId !=null){
            encrypt = [SELECT id,Name From EnCrypt_Decrypt__c
                    WHERE id=:recordId];
           
        }
        else{
            encrypt = new EnCrypt_Decrypt__c();
          
        }
    }
   
    public PageReference Save(){
        
         Blob data = Blob.valueOf(encrypt.Name);
         Blob encryptedData = Crypto.encryptWithManagedIV('AES128', cryptoKey , data );
        
         String b64Data = EncodingUtil.base64Encode(encryptedData);
        
         encrypt.name = b64Data ;
        
        
         insert encrypt;
        
         return null;
    }
    public PageReference test(){
        
         //Blob cryptoKey = Crypto.generateAesKey(256);
         //Blob data = Blob.valueOf(encrypt.Name);
         Blob data = EncodingUtil.base64Decode(encrypt.Name);
        
         Blob decryptedData = Crypto.decryptWithManagedIV('AES128', cryptoKey , data);
        
         String dryptData = decryptedData.toString();
        
         System.debug('Printing dryptData '+dryptData);
        
        
         encrypt.name = dryptData;
               
        
         update encrypt;
        
         return null;
    }
}