30 days of node - Day 10 : Symmetric encryption and decryption using …

…crypto module of node.js

day-10-crypto-module-part-2/enc-priv-dec-pub.js

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+/** 
+    Example of Asymmetric encryption
+    Encrypting using private key and decrypting using public key
+    File Name : enc-priv-dec-pub.js
+    Author : @nodejsera
+ **/
+//Including the required modules
+var crypto = require('crypto');
+var fs = require('fs');
+
+//Reading the Private Key
+privK = {
+    key: fs.readFileSync('priv.key').toString(),
+    passphrase: 'nodejsera'
+}
+//Passing the text to be encrypted using private key
+var buf = Buffer.from('rishabh', 'utf8');
+
+//Encrypting the text
+secretData = crypto.privateEncrypt(privK, buf);
+//printing the encrypted text
+console.log(secretData.toString('utf8'));
+//reading the Public key
+pubK = fs.readFileSync('pub.key').toString();
+//decrypting the text using public key
+origData = crypto.publicDecrypt(pubK, secretData)
+//Printing the original content
+console.log(origData.toString());

day-10-crypto-module-part-2/enc-pub-dec-priv.js

@@ -0,0 +1,29 @@
+/** 
+    Example of Asymmetric encryption
+    Encrypting using public key and decrypting using private key
+    File Name : enc-pub-dec-priv.js
+    Author : @nodejsera
+ **/
+//Including the required modules
+var crypto = require('crypto');
+var fs = require('fs');
+
+//Reading the Public Key
+pubK = privK = fs.readFileSync('pub.key').toString();
+
+//Passing the text to be encrypted using private key
+var buf = Buffer.from('This is secret code', 'utf8');
+
+//Encrypting the text
+secretData = crypto.publicEncrypt(pubK, buf);
+//printing the encrypted text
+console.log(secretData.toString('utf8'));
+//reading the Private key
+privK = {
+    key: fs.readFileSync('priv.key').toString(),
+    passphrase: 'nodejsera'
+}
+//decrypting the text using public key
+origData = crypto.privateDecrypt(privK, secretData)
+//Printing the original content
+console.log(origData.toString());

day-10-crypto-module-part-2/priv.key

@@ -0,0 +1,30 @@
+-----BEGIN RSA PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: DES-EDE3-CBC,D881D8AD164DDF78
+
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+-----END RSA PRIVATE KEY-----

day-10-crypto-module-part-2/pub.key

@@ -0,0 +1,9 @@
+-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAo9sqaQbz3ddaxd8uQG3K
+GIr98k/NS6xUxssTadR4uOgiJtcm9uknBgAAa2+RuSup60uCGW0KFiPHYfpDYzr8
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+X1aaRnmZMu6mLNekv1ZZSCRWLjzO5x4ODDNRqjvMpqmUTJkK4j2qrad41FiRoXDl
+uQIDAQAB
+-----END PUBLIC KEY-----

day-10-crypto-module-part-2/symmetric-enc-dec.js

@@ -0,0 +1,28 @@
+var crypto = require('crypto'),algorithm = 'aes-256-ctr',password = 'RJ23edrf';
+//Here "aes-256-cbc" is the advance encryption standard we are using for encryption.
+//Text is the Confidential data which we need to encrypt using 'password'(Key).
+
+function encrypt(text){
+    var cipher = crypto.createCipher(algorithm,password)
+    var crypted = cipher.update(text,'utf8','hex')
+    crypted += cipher.final('hex');
+    return crypted;
+}
+
+//Here "aes-256-cbc" is the advance encyption standard we used for encrytion.
+//Text is the Cipher which we need to decrypt using 'password'(Key).
+function decrypt(text){
+   var decipher = crypto.createDecipher(algorithm,password)
+   var dec = decipher.update(text,'hex','utf8')
+   dec += decipher.final('utf8');
+   return dec;
+}
+
+//Actual content
+var text = "Nodejsera for all web development languages";
+//Calling the encrypt function and printing the encrypted content				
+var e = encrypt(text);
+console.log(e);
+//calling the decrypt function and printing the decrypted content
+var d = decrypt(e);
+console.log(d);

day-10-crypto-module-part-2/user.priv.key

@@ -0,0 +1,30 @@
+-----BEGIN RSA PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: DES-EDE3-CBC,05391439A8237D95
+
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+Jt6YinRsJ/Ad+CZ3ue6AcW1KaNhu4+V8ad2vDOriNpYEReVs1Bjocg==
+-----END RSA PRIVATE KEY-----

day-10-crypto-module-part-2/user.pub.key

@@ -0,0 +1,9 @@
+-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzIUe9DwLYTHe15MKVLdw
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+JwIDAQAB
+-----END PUBLIC KEY-----