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Encrypting Decrypting Data via Entity Framework using separate class exposing encrypted/decrypted values: Linq statement


Encrypting Decrypting Data via Entity Framework using separate class exposing encrypted/decrypted values: Linq statement

By : user2954892
Date : November 22 2020, 10:33 AM
will help you On adding the user object to the dbcontext, you should set UserName=Encrypt(model.UserName) where model is the object returned by the user for adding it
code :
// before adding the model to the dbcontext
model.UserName=Encrypt(mode.UserName);
db.Users.Add(model);
db.SaveChanges();

[Table("Users")]
public class User
{
    #region database table column mapped fields
    [Key]
    [Required]
    public Int32 UserID { set; get; }

    [Required]
    [MaxLength(50)]
    public String UserName { set; get; } // this field will be encrypted field

    [Required]
    public Int32 CustID { set; get; }

    [NotMapped]
    public string DecryptedUserName
    {
        get { return Decrypt(UserName); }  // this you can display it to the user
    }
}
using System.ComponentModel.DataAnnotations.Schema;


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node.js: encrypting data that needs to be decrypted?

node.js: encrypting data that needs to be decrypted?


By : LogiXxX
Date : March 29 2020, 07:55 AM
Hope that helps You can use the crypto module:
code :
var crypto = require('crypto');
var assert = require('assert');

var algorithm = 'aes256'; // or any other algorithm supported by OpenSSL
var key = 'password';
var text = 'I love kittens';

var cipher = crypto.createCipher(algorithm, key);  
var encrypted = cipher.update(text, 'utf8', 'hex') + cipher.final('hex');
var decipher = crypto.createDecipher(algorithm, key);
var decrypted = decipher.update(encrypted, 'hex', 'utf8') + decipher.final('utf8');

assert.equal(decrypted, text);
Add Data Annotation To Entity Framework(Or Linq to SQL) generated class

Add Data Annotation To Entity Framework(Or Linq to SQL) generated class


By : user3718051
Date : March 29 2020, 07:55 AM
Hope this helps Yes. You need to create a 2nd partial class for each entity and link it to an auxiliary class with substitute properties.
Suppose you have a generated partial class Customer { public string Name { get; set; } }
code :
[MetadataType(typeof(CustomerMetadata))]
public partial class Customer
{
    // it's possible to add logic and non-mapped properties here
}


public class CustomerMetadata
{
    [Required(ErrorMessage="Name is required")] 
    public object Name { get; set; }   // note the 'object' type, can be anything
}
Exposing Entity Framework data types over WCF

Exposing Entity Framework data types over WCF


By : user7706331
Date : March 29 2020, 07:55 AM
may help you . I don't think you can transparently disconnect EF objects from the db easily, however you can create a dto or poco and send that over the network. For reads is not a problem, you send read-only data, for writing to the db, either create method dedicated to updating data, or you can take the EF object, send and receive a copy, suitably wrapped as poco/dto, and then update it with the changes.
It's probably better though to model your middle tier differently to the db schema however, make ita domain model so there's not a 1 to 1 mapping between wcf methods and EF objects. Then you can make your wcf model more appropriate for the caller.
Encrypting and decrypted data before save in cakephp

Encrypting and decrypted data before save in cakephp


By : vhb
Date : March 29 2020, 07:55 AM
I wish this help you Have a look at the Cookbook under Models > Callback Methods. http://book.cakephp.org/2.0/en/models/callback-methods.html
Maybe you need to use beforeSave and afterFind?
Re-encrypting the encrypted data file generates a decrypted output

Re-encrypting the encrypted data file generates a decrypted output


By : user2939696
Date : March 29 2020, 07:55 AM
it should still fix some issue
If the same encrypted file is passed again for encryption, generates the output which includes encrypted and decrypted data.
code :
std::vector<byte> key = HexDecoding(PASSCODE);
std::vector<byte> iv = HexDecoding(INITIALIZATION_VECTOR);
cryptopp$ cat test.cxx
#include "cryptlib.h"
#include "filters.h"
#include "files.h"
#include "aes.h"
#include "gcm.h"
#include "hex.h"
#include "hkdf.h"
#include "sha.h"

#include <string>
#include <iostream>

int main(int argc, char* argv[])
{
    using namespace CryptoPP;

    std::string password = "super secret password";
    SecByteBlock key(32), iv(32);

    HKDF<SHA256> hkdf;
    hkdf.DeriveKey(key, key.size(),
                   (const byte*)password.data(), password.size(),
                   NULL, 0,  // salt
                   (const byte*)"key derivation", 14);

    hkdf.DeriveKey(iv, iv.size(),
                   (const byte*)password.data(), password.size(),
                   NULL, 0,  // salt
                   (const byte*)"iv derivation", 13);


    std::string m = "Yoda said, Do or do not. There is no try.";
    std::string c1, c2;

    GCM<AES>::Encryption encryptor;

    encryptor.SetKeyWithIV(key, 16, iv, 16);
    StringSource(m, true, new AuthenticatedEncryptionFilter(
                 encryptor, new StringSink(c1)));

    encryptor.SetKeyWithIV(key+16, 16, iv+16, 16);
    StringSource(c1, true, new AuthenticatedEncryptionFilter(
                 encryptor, new StringSink(c2)));    

    std::cout << "Hex(m):" << std::endl;
    StringSource(m, true, new HexEncoder(new FileSink(std::cout)));
    std::cout << std::endl;

    std::cout << "Hex(Enc(m)):" << std::endl;
    StringSource(c1, true, new HexEncoder(new FileSink(std::cout)));
    std::cout << std::endl;

    std::cout << "Hex(Enc(Enc(m))):" << std::endl;
    StringSource(c2, true, new HexEncoder(new FileSink(std::cout)));
    std::cout << std::endl;

    return 0;
}
cryptopp$ ./test.exe
Hex(m):
596F646120736169642C20446F206F7220646F206E6F742E205468657265206973206E6F20747279
2E
Hex(Enc(m)):
D4A9063DE7400E90627DE90D16346DC5A99740C55F6FEE092A99071F55F1BDB25A72B7422126CCC4
09B5B5C0076E39EBF7256D5DC3151A738D
Hex(Enc(Enc(m))):
83A459F2D4A1627624AF162590465AC705C8AC0F4D915E4A4A9D300156C5F9E042CAA47903353F0A
A1FAE408D5747DD223AC4F9AEF3C320EEF7E79E08AB2C6FBEAE7A3A5B4978C45C7
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