add rsa sample

Author: michaelliao

samples/node/crypto/.vscode/launch.json

@@ -80,6 +80,26 @@
             "externalConsole": false,
             "sourceMaps": false,
             "outDir": null
+        },
+        {
+            "name": "Run rsa.js",
+            "type": "node",
+            "request": "launch",
+            "program": "${workspaceRoot}/rsa.js",
+            "stopOnEntry": false,
+            "args": [],
+            "cwd": "${workspaceRoot}",
+            "preLaunchTask": null,
+            "runtimeExecutable": null,
+            "runtimeArgs": [
+                "--nolazy"
+            ],
+            "env": {
+                "NODE_ENV": "development"
+            },
+            "externalConsole": false,
+            "sourceMaps": false,
+            "outDir": null
         }
     ]
 }

samples/node/crypto/rsa-key.pem

@@ -0,0 +1,30 @@
+-----BEGIN RSA PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: AES-256-CBC,D7404CE12F8B7A5F5AAC950F4ED928DF
+
+J1rhNZQFt2qodd5GRqUj1dB/fuGJNcZhIGHg1lsimtWXmnhbUML+qez2P0Q1MuI1
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+GDP1LK0nuA0FfNcrKvPX3pEI/EcrfoUZ6DtaCOU+AmyFsS7xSA6Ae+YjCol2Y7sC
++WaIpEZzAbvHrVFfWQdVpo9VURKxtud4ZaPf9mUYugLfqMv8mnwMk5N13WU9qOmn
+i/9w/GB6Hl7QO7FOacLa3hxicl9N8a2o7pH9NUXx1Wt7APOXmbPSnXHAlk+G1+ex
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+BjKFwPgLVB0XNyOatVZcoKalZnylzEoRo2WfLL0Blm1yglxsZPS1dUOOY6v0swJY
+O6PaQiLm4rEcGFTfWiQ38KSEDi0Dwt2ddwr1O/27wF77R6L9uybToOgbe9SVOemT
+/ldVF8/MpSJ3AhQTV4eDrXTLpCR35P1TkTPIdLvV6jklXNpY40Y3YB+Vurr8W8ZU
+n1L5q0fUWs5DulUyxn1tRC3FRnrBw/bgpACz7GKewNP4Tf8xWtWwYYP6KHS4S5+4
+-----END RSA PRIVATE KEY-----

samples/node/crypto/rsa-prv.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAkutKlptlsXWe4od+se7M0I6xQ7CcKuN+B7LUmT3toMWTThXd
+fEUjbtkZsQAd/NRw9kCSNkUqFoKHHe1YUEa+fhdjdL6rLRL+K9O3hV5EUHL6CykC
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+PI3jkHqJBV3xba1eqHCA2SOJ3s5EZHOHCOnZQLePBVUTfYLPSaPt
+-----END RSA PRIVATE KEY-----

samples/node/crypto/rsa-pub.pem

@@ -0,0 +1,9 @@
+-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAkutKlptlsXWe4od+se7M
+0I6xQ7CcKuN+B7LUmT3toMWTThXdfEUjbtkZsQAd/NRw9kCSNkUqFoKHHe1YUEa+
+fhdjdL6rLRL+K9O3hV5EUHL6CykC+UbjxQ4EOi7fScAv7f1g9jAD6vtI+Rml44uU
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+/qUgDVRcozt3GEAx0AgpGBRYGnXOMEMNTsiYwsGrAw2VJxX9SjmYmE47XAFaTEYL
+9QIDAQAB
+-----END PUBLIC KEY-----

samples/node/crypto/rsa.js

@@ -0,0 +1,45 @@
+/**
+ * HOW TO GENERATE RSA KEY
+ * 
+ * 1. generate RSA keypair:
+ * 
+ * $ openssl genrsa -aes256 -out rsa-key.pem 2048
+ * (enter password to protect the RSA key)
+ * 
+ * 2. export private key:
+ * 
+ * $ openssl rsa -in rsa-key.pem -outform PEM -out rsa-prv.pem
+ * (enter password)
+ * 
+ * 3. export public key:
+ * 
+ * $ openssl rsa -in rsa-key.pem -outform PEM -pubout -out rsa-pub.pem
+ * (enter password)
+ */
+
+const
+    fs = require('fs'),
+    crypto = require('crypto');
+
+function loadKey(file) {
+    return fs.readFileSync(file, 'utf8');
+}
+
+let
+    prvKey = loadKey('./rsa-prv.pem'),
+    pubKey = loadKey('./rsa-pub.pem'),
+    message = 'Hello, world!';
+
+// encrypt by private key, then decrypt by public key:
+let enc_by_prv = crypto.privateEncrypt(prvKey, Buffer.from(message, 'utf8'));
+console.log('encrypted by private key: ' + enc_by_prv.toString('hex'));
+
+let dec_by_pub = crypto.publicDecrypt(pubKey, enc_by_prv);
+console.log('decrypted by public key: ' + dec_by_pub.toString('utf8'));
+
+// encrypt by public key, then decrypt by private key:
+let enc_by_pub = crypto.publicEncrypt(pubKey, Buffer.from(message, 'utf8'));
+console.log('encrypted by public key: ' + enc_by_pub.toString('hex'));
+
+let dec_by_prv = crypto.privateDecrypt(prvKey, enc_by_pub);
+console.log('decrypted by private key: ' + dec_by_prv.toString('utf8'));