TrustyPay.Crypto 0.0.13

TrustyPay.Crypto

What is TrustyPay.Crypto?

TrustyPay.Crypto is a library about cryptographic algorithm, which includes RSA/SM2 and AES/SM4. In addition, it defines a http client abstract class which provides GetAsync and PostAsync methods. These methods may wrap request or response with different encryption or signature simply. Some libraries, such as TrustyPay.Crypto.Banks.ICBC, TrustyPay.Crypto.Banks.CMB, have extended the abstract class to meet the requirements of bank api.

Installing

using .net cli:

dotnet add package TrustyPay.Crypto

import namespace:

using TrustyPay.Crypto;

How to use

• AES class

  1. Secret key generation

     // generate 128 bit secret key.
     var secretKey = AES.GenerateSecretKey(KeySize.AES128);
     

  2. Encryption

     var aes = new AES(secretKey.Key, secretKey.IV);
     var cipherText = aes.Encrypt("hello_world!!!".FromUTF8String()).ToBase64();
     

  3. Decryption

     var aes = new AES(secretKey.Key, secretKey.IV);
     var plainText = aes.Decrypt("<the above cipher text>".FromBase64()).ToUTF8String();
     

• SM4 class

  1. Secret key generation

     // generate 128 bit secret key.
     var secretKey = SM4.GenerateSecretKey();
     

  2. Encryption

     var sm4 = new SM4(secretKey.Key, secretKey.IV);
     var cipherText = sm4.Encrypt(
         "hello_world!!!".FromUTF8String()).ToBase64();
     

  3. Decryption

     var sm4 = new SM4(secretKey.Key, secretKey.IV);
     var plainText = sm4.Decrypt(
         "<the above cipher text>".FromBase64()).ToUTF8String();
     

• RSA class

  1. Private/Public key generation

     // key size is 2048
     var keyPair = RSA.GenerateKeyPair(
         RSA.PrivateKey.PrivateKeyFormat.Pkcs1, RSA.KeySize.RSA2048);
     

  2. Encryption

     using System.Security.Cryptography;
     
     var rsa = new RSA(keyPair, RSAEncryptionPadding.Pkcs1);
     var cipherText = rsa.Encrypt(
         "hello_world!!!".FromUTF8String()).ToBase64();
     

  3. Decryption

     using System.Security.Cryptography;
     
     var rsa = new RSA(keyPair, RSAEncryptionPadding.Pkcs1);
     var plainText = rsa.Decrypt(
         "<the above cipher text>".FromBase64()).ToUTF8String();
     

  4. Sign

     using System.Security.Cryptography;
     
     var rsa = new RSA(keyPair, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
     var signatureText = rsa.Sign(
         "hello_world!!!".FromUTF8String()).ToBase64();
     

  5. Verification

     using System.Security.Cryptography;
     
     var rsa = new RSA(keyPair, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
     var ok = rsa.Verify(
         "hello_world!!!".FromUTF8String(), "<the above signature text>".FromBase64());
     

• SM2 class

  1. Private/Public key generation

     var keyPair = SM2.GenerateKeyPair();
     

  2. Encryption

     var sm2 = new SM2(keyPair, CipherFormat.C1C2C3);
     var cipherText = sm2.Encrypt(
         "hello_world!!!".FromUTF8String()).ToBase64();
     

  3. Decryption

     var sm2 = new SM2(keyPair, CipherFormat.C1C2C3);
     var plainText = sm2.Decrypt(
         "<the above cipher text>".FromBase64()).ToUTF8String();
     

  4. Sign

     var sm2 = new SM2(keyPair);
     var signatureText = sm2.Sign(
         "hello_world!!!".FromUTF8String()).ToBase64();
     

  5. Verification

     
     var rsa = new SM2(keyPair);
     var ok = sm2.Verify(
         "hello_world!!!".FromUTF8String(), 
         "<the above signature text>".FromBase64());