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Merge pull request #323 from nevermined-io/feat/remove-dpt-dependency
Feat/remove dpt dependency
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| import crypto from 'crypto' | ||
| import { decrypt as ec_decrypt, encrypt as ec_encrypt } from 'eciesjs' | ||
| import { HDNodeWallet, ethers } from 'ethers' | ||
| import NodeRSA from 'node-rsa' | ||
|
|
||
| export interface CryptoConfig { | ||
| provider_key: string | ||
| provider_password: string | ||
| provider_rsa_public: string | ||
| provider_rsa_private: string | ||
| } | ||
|
|
||
| const get_aes_private_key = (passphrase: string) => { | ||
| const salt = Buffer.from('this is a salt') | ||
| const kdf = crypto.pbkdf2Sync(passphrase, salt, 48, 10000, 'sha256').toString('binary') | ||
| const key = kdf.substring(0, 16) | ||
| return Buffer.from(key, 'binary') | ||
| } | ||
|
|
||
| const BLOCK_SIZE = 16 | ||
| const AES_BLOCK_SIZE = 16 | ||
|
|
||
| function mod(a: number, n: number) { | ||
| return a - n * Math.floor(a / n) | ||
| } | ||
|
|
||
| const pad = (s: string) => { | ||
| const md = BLOCK_SIZE - mod(s.length, BLOCK_SIZE) | ||
| return s + String.fromCharCode(md).repeat(md) | ||
| } | ||
|
|
||
| const unpad = (s: string) => { | ||
| const num = s.charCodeAt(s.length - 1) | ||
| return s.substring(0, s.length - num) | ||
| } | ||
|
|
||
| const aes_encryption = (data, passphrase) => { | ||
| const private_key = get_aes_private_key(passphrase) | ||
| const iv = crypto.randomBytes(AES_BLOCK_SIZE) | ||
| const cipher = crypto.createCipheriv('aes-128-cbc', private_key, iv) | ||
| let res = cipher.update(pad(data), 'binary', 'binary') | ||
| res += cipher.final('binary') | ||
| return Buffer.from(iv.toString('binary') + res, 'binary').toString('base64') | ||
| } | ||
|
|
||
| const aes_decryption = (data64, passphrase) => { | ||
| const private_key = get_aes_private_key(passphrase) | ||
| const data = Buffer.from(data64, 'base64') | ||
| const iv = data.subarray(0, AES_BLOCK_SIZE) | ||
| const cipher = crypto.createDecipheriv('aes-128-cbc', private_key, iv) | ||
| let res = cipher.update(data.subarray(AES_BLOCK_SIZE).toString('binary'), 'binary', 'binary') | ||
| res += cipher.final('binary') | ||
| return unpad(res) | ||
| } | ||
|
|
||
| export const aes_encryption_256 = (data, passphrase) => { | ||
| const salt = crypto.randomBytes(BLOCK_SIZE - 'Salted__'.length) | ||
| const kdf = crypto.pbkdf2Sync(passphrase, salt, 10000, 48, 'sha256').toString('binary') | ||
| const private_key = Buffer.from(kdf.substring(0, 32), 'binary') | ||
| const iv = Buffer.from(kdf.substring(32, 48), 'binary') | ||
| const cipher = crypto.createCipheriv('aes-256-cbc', private_key, iv) | ||
| let res = cipher.update(pad(data), 'binary', 'binary') | ||
| res += cipher.final('binary') | ||
| return Buffer.from('Salted__' + salt.toString('binary') + res, 'binary').toString('binary') | ||
| } | ||
|
|
||
| export const aes_decryption_256 = (encrypted, password) => { | ||
| const salt = Buffer.from(encrypted.substring(8, 16), 'binary') | ||
| const keydata = crypto.pbkdf2Sync(password, salt, 10000, 48, 'sha256').toString('binary') | ||
| const key = Buffer.from(keydata.substring(0, 32), 'binary') | ||
| const iv = Buffer.from(keydata.substring(32, 48), 'binary') | ||
| const decipher = crypto.createDecipheriv('aes-256-cbc', key, iv) | ||
|
|
||
| let decrypted = decipher.update(encrypted.substring(16), 'binary', 'binary') | ||
| decrypted += decipher.final() | ||
| return unpad(decrypted) | ||
| } | ||
|
|
||
| export const encrypt = async ( | ||
| config: CryptoConfig, | ||
| cipherText: string, | ||
| method: string, | ||
| ): Promise<{ publicKey: string; result: string }> => { | ||
| if (method === 'PSK-ECDSA') { | ||
| const wallet = await ethers.Wallet.fromEncryptedJson( | ||
| config.provider_key, | ||
| config.provider_password, | ||
| ) | ||
| const ecdh = crypto.createECDH('secp256k1') | ||
| ecdh.setPrivateKey(Buffer.from(wallet.privateKey.substring(2), 'hex')) | ||
| const result = ec_encrypt(ecdh.getPublicKey(), Buffer.from(cipherText)).toString('binary') | ||
| const res = { | ||
| publicKey: (wallet as HDNodeWallet).publicKey, | ||
| result, | ||
| } | ||
| return res | ||
| } else if (method === 'PSK-RSA') { | ||
| const key = new NodeRSA(config.provider_rsa_public) | ||
| const aes_key = crypto.randomBytes(16) | ||
| const encrypted_data = aes_encryption(cipherText, aes_key) | ||
| const encrypted_aes_key = key.encrypt(aes_key) | ||
| return { | ||
| publicKey: key.exportKey('public'), | ||
| result: | ||
| Buffer.from(encrypted_data).toString('hex') + | ||
| '|' + | ||
| Buffer.from(encrypted_aes_key).toString('hex'), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| export const decrypt = async (config: CryptoConfig, cipherText: string, method: string) => { | ||
| if (method === 'PSK-ECDSA') { | ||
| const wallet = await ethers.Wallet.fromEncryptedJson( | ||
| config.provider_key, | ||
| config.provider_password, | ||
| ) | ||
| const ecdh = crypto.createECDH('secp256k1') | ||
| ecdh.setPrivateKey(Buffer.from(wallet.privateKey.substring(2), 'hex')) | ||
| return ec_decrypt(ecdh.getPrivateKey(), Buffer.from(cipherText, 'binary')).toString() | ||
| } else if (method === 'PSK-RSA') { | ||
| const key = new NodeRSA(config.provider_rsa_private) | ||
| const [data, encrypted_aes_key] = cipherText.split('|') | ||
| const aes_key = key.decrypt(Buffer.from(encrypted_aes_key, 'hex')) | ||
| return aes_decryption(Buffer.from(data, 'hex').toString(), aes_key) | ||
| } | ||
| } |
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