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doc: update crypto examples to not use deprecated api
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Updated Cipher and Decipher examples to not use deprecated
`crypto.createCipher` and `crypto.createDecipher` in examples and
instead use `createCipheriv` and `createDecipheriv`.

Fixes: #24046

PR-URL: #24107
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Ujjwal Sharma <[email protected]>
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mayankasthana authored and codebytere committed Jan 29, 2019
1 parent c29c510 commit 7fd4ef7
Showing 1 changed file with 67 additions and 10 deletions.
77 changes: 67 additions & 10 deletions doc/api/crypto.md
Original file line number Diff line number Diff line change
Expand Up @@ -185,7 +185,18 @@ Example: Using `Cipher` objects as streams:

```js
const crypto = require('crypto');
const cipher = crypto.createCipher('aes192', 'a password');

const algorithm = 'aes-192-cbc';
const password = 'Password used to generate key';
// Key length is dependent on the algorithm. In this case for aes192, it is
// 24 bytes (192 bits).
// Use async `crypto.scrypt()` instead.
const key = crypto.scryptSync(password, 'salt', 24);
// Use `crypto.randomBytes()` to generate a random iv instead of the static iv
// shown here.
const iv = Buffer.alloc(16, 0); // Initialization vector.

const cipher = crypto.createCipheriv(algorithm, key, iv);

let encrypted = '';
cipher.on('readable', () => {
Expand All @@ -195,7 +206,7 @@ cipher.on('readable', () => {
});
cipher.on('end', () => {
console.log(encrypted);
// Prints: ca981be48e90867604588e75d04feabb63cc007a8f8ad89b10616ed84d815504
// Prints: e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa
});

cipher.write('some clear text data');
Expand All @@ -207,7 +218,16 @@ Example: Using `Cipher` and piped streams:
```js
const crypto = require('crypto');
const fs = require('fs');
const cipher = crypto.createCipher('aes192', 'a password');

const algorithm = 'aes-192-cbc';
const password = 'Password used to generate key';
// Use the async `crypto.scrypt()` instead.
const key = crypto.scryptSync(password, 'salt', 24);
// Use `crypto.randomBytes()` to generate a random iv instead of the static iv
// shown here.
const iv = Buffer.alloc(16, 0); // Initialization vector.

const cipher = crypto.createCipheriv(algorithm, key, iv);

const input = fs.createReadStream('test.js');
const output = fs.createWriteStream('test.enc');
Expand All @@ -219,12 +239,21 @@ Example: Using the [`cipher.update()`][] and [`cipher.final()`][] methods:

```js
const crypto = require('crypto');
const cipher = crypto.createCipher('aes192', 'a password');

const algorithm = 'aes-192-cbc';
const password = 'Password used to generate key';
// Use the async `crypto.scrypt()` instead.
const key = crypto.scryptSync(password, 'salt', 24);
// Use `crypto.randomBytes` to generate a random iv instead of the static iv
// shown here.
const iv = Buffer.alloc(16, 0); // Initialization vector.

const cipher = crypto.createCipheriv(algorithm, key, iv);

let encrypted = cipher.update('some clear text data', 'utf8', 'hex');
encrypted += cipher.final('hex');
console.log(encrypted);
// Prints: ca981be48e90867604588e75d04feabb63cc007a8f8ad89b10616ed84d815504
// Prints: e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa
```

### cipher.final([outputEncoding])
Expand Down Expand Up @@ -340,7 +369,17 @@ Example: Using `Decipher` objects as streams:

```js
const crypto = require('crypto');
const decipher = crypto.createDecipher('aes192', 'a password');

const algorithm = 'aes-192-cbc';
const password = 'Password used to generate key';
// Key length is dependent on the algorithm. In this case for aes192, it is
// 24 bytes (192 bits).
// Use the async `crypto.scrypt()` instead.
const key = crypto.scryptSync(password, 'salt', 24);
// The IV is usually passed along with the ciphertext.
const iv = Buffer.alloc(16, 0); // Initialization vector.

const decipher = crypto.createDecipheriv(algorithm, key, iv);

let decrypted = '';
decipher.on('readable', () => {
Expand All @@ -353,8 +392,9 @@ decipher.on('end', () => {
// Prints: some clear text data
});

// Encrypted with same algorithm, key and iv.
const encrypted =
'ca981be48e90867604588e75d04feabb63cc007a8f8ad89b10616ed84d815504';
'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa';
decipher.write(encrypted, 'hex');
decipher.end();
```
Expand All @@ -364,7 +404,15 @@ Example: Using `Decipher` and piped streams:
```js
const crypto = require('crypto');
const fs = require('fs');
const decipher = crypto.createDecipher('aes192', 'a password');

const algorithm = 'aes-192-cbc';
const password = 'Password used to generate key';
// Use the async `crypto.scrypt()` instead.
const key = crypto.scryptSync(password, 'salt', 24);
// The IV is usually passed along with the ciphertext.
const iv = Buffer.alloc(16, 0); // Initialization vector.

const decipher = crypto.createDecipheriv(algorithm, key, iv);

const input = fs.createReadStream('test.enc');
const output = fs.createWriteStream('test.js');
Expand All @@ -376,10 +424,19 @@ Example: Using the [`decipher.update()`][] and [`decipher.final()`][] methods:

```js
const crypto = require('crypto');
const decipher = crypto.createDecipher('aes192', 'a password');

const algorithm = 'aes-192-cbc';
const password = 'Password used to generate key';
// Use the async `crypto.scrypt()` instead.
const key = crypto.scryptSync(password, 'salt', 24);
// The IV is usually passed along with the ciphertext.
const iv = Buffer.alloc(16, 0); // Initialization vector.

const decipher = crypto.createDecipheriv(algorithm, key, iv);

// Encrypted using same algorithm, key and iv.
const encrypted =
'ca981be48e90867604588e75d04feabb63cc007a8f8ad89b10616ed84d815504';
'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa';
let decrypted = decipher.update(encrypted, 'hex', 'utf8');
decrypted += decipher.final('utf8');
console.log(decrypted);
Expand Down

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