Bring src of sdk-core-wallet with history

src-wallet/assertions.ts

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+import { ErrInvariantFailed } from "./errors";
+
+export function guardLength(withLength: { length?: number }, expectedLength: number) {
+    let actualLength = withLength.length || 0;
+
+    if (actualLength != expectedLength) {
+        throw new ErrInvariantFailed(`wrong length, expected: ${expectedLength}, actual: ${actualLength}`);
+    }
+}

src-wallet/config.ts

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+/**
+ * Global configuration of the library.
+ *
+ * Generally speaking, this configuration should only be altered on exotic use cases;
+ * it can be seen as a collection of constants (or, to be more precise, rarely changed variables) that are used throughout the library.
+ *
+ * Never alter the configuration within a library!
+ * Only alter the configuration (if needed) within an (end) application that uses this library.
+ */
+export class LibraryConfig {
+    /**
+     * The human-readable-part of the bech32 addresses.
+     */
+    public static DefaultAddressHrp: string = "erd";
+}

src-wallet/crypto/constants.ts

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+export const CipherAlgorithm = "aes-128-ctr";
+export const DigestAlgorithm = "sha256";
+export const KeyDerivationFunction = "scrypt";
+
+// X25519 public key encryption
+export const PubKeyEncVersion = 1;
+export const PubKeyEncNonceLength = 24;
+export const PubKeyEncCipher = "x25519-xsalsa20-poly1305";

src-wallet/crypto/decryptor.ts

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+import crypto from "crypto";
+import { EncryptedData } from "./encryptedData";
+import { DigestAlgorithm } from "./constants";
+import { Err } from "../errors";
+
+export class Decryptor {
+  static decrypt(data: EncryptedData, password: string): Buffer {
+    const kdfparams = data.kdfparams;
+    const salt = Buffer.from(data.salt, "hex");
+    const iv = Buffer.from(data.iv, "hex");
+    const ciphertext = Buffer.from(data.ciphertext, "hex");
+    const derivedKey = kdfparams.generateDerivedKey(Buffer.from(password), salt);
+    const derivedKeyFirstHalf = derivedKey.slice(0, 16);
+    const derivedKeySecondHalf = derivedKey.slice(16, 32);
+
+    const computedMAC = crypto.createHmac(DigestAlgorithm, derivedKeySecondHalf).update(ciphertext).digest();
+    const actualMAC = data.mac;
+
+    if (computedMAC.toString("hex") !== actualMAC) {
+      throw new Err("MAC mismatch, possibly wrong password");
+    }
+
+    const decipher = crypto.createDecipheriv(data.cipher, derivedKeyFirstHalf, iv);
+
+    return Buffer.concat([decipher.update(ciphertext), decipher.final()]);
+  }
+}

src-wallet/crypto/derivationParams.ts

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+import scryptsy from "scryptsy";
+
+export class ScryptKeyDerivationParams {
+  /**
+   * numIterations
+   */
+  n = 4096;
+
+  /**
+   * memFactor
+   */
+  r = 8;
+
+  /**
+   * pFactor
+   */
+  p = 1;
+
+  dklen = 32;
+
+  constructor(n = 4096, r = 8, p = 1, dklen = 32) {
+    this.n = n;
+    this. r = r;
+    this.p = p;
+    this.dklen = dklen;
+  }
+
+  /**
+   * Will take about:
+   *  - 80-90 ms in Node.js, on a i3-8100 CPU @ 3.60GHz
+   *  - 350-360 ms in browser (Firefox), on a i3-8100 CPU @ 3.60GHz
+   */
+  public generateDerivedKey(password: Buffer, salt: Buffer): Buffer {
+    return scryptsy(password, salt, this.n, this.r, this.p, this.dklen);
+  }
+}

src-wallet/crypto/encrypt.spec.ts

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+import { assert } from "chai";
+import { Decryptor } from "./decryptor";
+import { EncryptedData } from "./encryptedData";
+import { Encryptor } from "./encryptor";
+
+describe("test address", () => {
+  it("encrypts/decrypts", () => {
+    const sensitiveData = Buffer.from("my mnemonic");
+    const encryptedData = Encryptor.encrypt(sensitiveData, "password123");
+    const decryptedBuffer = Decryptor.decrypt(encryptedData, "password123");
+
+    assert.equal(sensitiveData.toString('hex'), decryptedBuffer.toString('hex'));
+  });
+
+  it("encodes/decodes kdfparams", () => {
+    const sensitiveData = Buffer.from("my mnemonic");
+    const encryptedData = Encryptor.encrypt(sensitiveData, "password123");
+    const decodedData = EncryptedData.fromJSON(encryptedData.toJSON());
+
+    assert.deepEqual(decodedData, encryptedData, "invalid decoded data");
+  });
+});

src-wallet/crypto/encryptedData.ts

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+import { ScryptKeyDerivationParams } from "./derivationParams";
+
+export class EncryptedData {
+  id: string;
+  version: number;
+  cipher: string;
+  ciphertext: string;
+  iv: string;
+  kdf: string;
+  kdfparams: ScryptKeyDerivationParams;
+  salt: string;
+  mac: string;
+
+  constructor(data: Omit<EncryptedData, "toJSON">) {
+    this.id = data.id;
+    this.version = data.version;
+    this.ciphertext = data.ciphertext;
+    this.iv = data.iv;
+    this.cipher = data.cipher;
+    this.kdf = data.kdf;
+    this.kdfparams = data.kdfparams;
+    this.mac = data.mac;
+    this.salt = data.salt;
+  }
+
+  toJSON(): any {
+    return {
+      version: this.version,
+      id: this.id,
+      crypto: {
+        ciphertext: this.ciphertext,
+        cipherparams: { iv: this.iv },
+        cipher: this.cipher,
+        kdf: this.kdf,
+        kdfparams: {
+          dklen: this.kdfparams.dklen,
+          salt: this.salt,
+          n: this.kdfparams.n,
+          r: this.kdfparams.r,
+          p: this.kdfparams.p
+        },
+        mac: this.mac,
+      }
+    };
+  }
+
+  static fromJSON(data: any): EncryptedData {
+    return new EncryptedData({
+      version: data.version,
+      id: data.id,
+      ciphertext: data.crypto.ciphertext,
+      iv: data.crypto.cipherparams.iv,
+      cipher: data.crypto.cipher,
+      kdf: data.crypto.kdf,
+      kdfparams: new ScryptKeyDerivationParams(
+        data.crypto.kdfparams.n,
+        data.crypto.kdfparams.r,
+        data.crypto.kdfparams.p,
+        data.crypto.kdfparams.dklen,
+      ),
+      salt: data.crypto.kdfparams.salt,
+      mac: data.crypto.mac,
+    });
+  }
+}

src-wallet/crypto/encryptor.ts

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+import crypto from "crypto";
+import { CipherAlgorithm, DigestAlgorithm, KeyDerivationFunction } from "./constants";
+import { ScryptKeyDerivationParams } from "./derivationParams";
+import { EncryptedData } from "./encryptedData";
+import { Randomness } from "./randomness";
+
+interface IRandomness {
+  id: string;
+  iv: Buffer;
+  salt: Buffer;
+}
+
+export enum EncryptorVersion {
+  V4 = 4,
+}
+
+export class Encryptor {
+  static encrypt(data: Buffer, password: string, randomness: IRandomness = new Randomness()): EncryptedData {
+    const kdParams = new ScryptKeyDerivationParams();
+    const derivedKey = kdParams.generateDerivedKey(Buffer.from(password), randomness.salt);
+    const derivedKeyFirstHalf = derivedKey.slice(0, 16);
+    const derivedKeySecondHalf = derivedKey.slice(16, 32);
+    const cipher = crypto.createCipheriv(CipherAlgorithm, derivedKeyFirstHalf, randomness.iv);
+
+    const ciphertext = Buffer.concat([cipher.update(data), cipher.final()]);
+    const mac = crypto.createHmac(DigestAlgorithm, derivedKeySecondHalf).update(ciphertext).digest();
+
+    return new EncryptedData({
+      version: EncryptorVersion.V4,
+      id: randomness.id,
+      ciphertext: ciphertext.toString('hex'),
+      iv: randomness.iv.toString('hex'),
+      cipher: CipherAlgorithm,
+      kdf: KeyDerivationFunction,
+      kdfparams: kdParams,
+      mac: mac.toString('hex'),
+      salt: randomness.salt.toString('hex')
+    });
+  }
+}

src-wallet/crypto/index.ts

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+export * from "./constants";
+export * from "./encryptor";
+export * from "./decryptor";
+export * from "./pubkeyEncryptor";
+export * from "./pubkeyDecryptor";
+export * from "./encryptedData";
+export * from "./randomness";

src-wallet/crypto/pubkeyDecryptor.ts

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+import crypto from "crypto";
+import nacl from "tweetnacl";
+import ed2curve from "ed2curve";
+import { X25519EncryptedData } from "./x25519EncryptedData";
+import { UserPublicKey, UserSecretKey } from "../userKeys";
+
+export class PubkeyDecryptor {
+    static decrypt(data: X25519EncryptedData, decryptorSecretKey: UserSecretKey): Buffer {
+        const ciphertext = Buffer.from(data.ciphertext, 'hex');
+        const edhPubKey = Buffer.from(data.identities.ephemeralPubKey, 'hex');
+        const originatorPubKeyBuffer = Buffer.from(data.identities.originatorPubKey, 'hex');
+        const originatorPubKey = new UserPublicKey(originatorPubKeyBuffer);
+
+        const authMessage = crypto.createHash('sha256').update(
+            Buffer.concat([ciphertext, edhPubKey])
+        ).digest();
+
+        if (!originatorPubKey.verify(authMessage, Buffer.from(data.mac, 'hex'))) {
+            throw new Error("Invalid authentication for encrypted message originator");
+        }
+
+        const nonce = Buffer.from(data.nonce, 'hex');
+        const x25519Secret = ed2curve.convertSecretKey(decryptorSecretKey.valueOf());
+        const x25519EdhPubKey = ed2curve.convertPublicKey(edhPubKey);
+        if (x25519EdhPubKey === null) {
+            throw new Error("Could not convert ed25519 public key to x25519");
+        }
+
+        const decryptedMessage = nacl.box.open(ciphertext, nonce, x25519EdhPubKey, x25519Secret);
+        if (decryptedMessage === null) {
+            throw new Error("Failed authentication for given ciphertext");
+        }
+
+        return Buffer.from(decryptedMessage);
+    }
+}

src-wallet/crypto/pubkeyEncrypt.spec.ts

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+import { assert } from "chai";
+import { loadTestWallet, TestWallet } from "../testutils/wallets";
+import { PubkeyEncryptor } from "./pubkeyEncryptor";
+import { UserPublicKey, UserSecretKey } from "../userKeys";
+import { PubkeyDecryptor } from "./pubkeyDecryptor";
+import { X25519EncryptedData } from "./x25519EncryptedData";
+
+describe("test address", () => {
+    let alice: TestWallet, bob: TestWallet, carol: TestWallet;
+    const sensitiveData = Buffer.from("alice's secret text for bob");
+    let encryptedDataOfAliceForBob: X25519EncryptedData;
+
+    before(async () => {
+        alice = await loadTestWallet("alice");
+        bob = await loadTestWallet("bob");
+        carol = await loadTestWallet("carol");
+
+        encryptedDataOfAliceForBob = PubkeyEncryptor.encrypt(sensitiveData, new UserPublicKey(bob.address.pubkey()), new UserSecretKey(alice.secretKey));
+    });
+
+    it("encrypts/decrypts",  () => {
+        const decryptedData = PubkeyDecryptor.decrypt(encryptedDataOfAliceForBob, new UserSecretKey(bob.secretKey));
+        assert.equal(sensitiveData.toString('hex'), decryptedData.toString('hex'));
+    });
+
+    it("fails for different originator", () => {
+        encryptedDataOfAliceForBob.identities.originatorPubKey = carol.address.hex();
+        assert.throws(() => PubkeyDecryptor.decrypt(encryptedDataOfAliceForBob, new UserSecretKey(bob.secretKey)), "Invalid authentication for encrypted message originator");
+    });
+
+    it("fails for different DH public key", () => {
+        encryptedDataOfAliceForBob.identities.ephemeralPubKey = carol.address.hex();
+        assert.throws(() => PubkeyDecryptor.decrypt(encryptedDataOfAliceForBob, new UserSecretKey(bob.secretKey)), "Invalid authentication for encrypted message originator");
+    });
+});

src-wallet/crypto/pubkeyEncryptor.ts

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+import crypto from "crypto";
+import ed2curve from "ed2curve";
+import nacl from "tweetnacl";
+import { UserPublicKey, UserSecretKey } from "../userKeys";
+import { PubKeyEncCipher, PubKeyEncNonceLength, PubKeyEncVersion } from "./constants";
+import { X25519EncryptedData } from "./x25519EncryptedData";
+
+export class PubkeyEncryptor {
+    static encrypt(data: Buffer, recipientPubKey: UserPublicKey, authSecretKey: UserSecretKey): X25519EncryptedData {
+        // create a new x25519 keypair that will be used for EDH
+        const edhPair = nacl.sign.keyPair();
+        const recipientDHPubKey = ed2curve.convertPublicKey(recipientPubKey.valueOf());
+        if (recipientDHPubKey === null) {
+            throw new Error("Could not convert ed25519 public key to x25519");
+        }
+        const edhConvertedSecretKey = ed2curve.convertSecretKey(edhPair.secretKey);
+
+        // For the nonce we use a random component and a deterministic one based on the message
+        //  - this is so we won't completely rely on the random number generator
+        const nonceDeterministic = crypto.createHash('sha256').update(data).digest().slice(0, PubKeyEncNonceLength / 2);
+        const nonceRandom = nacl.randomBytes(PubKeyEncNonceLength / 2);
+        const nonce = Buffer.concat([nonceDeterministic, nonceRandom]);
+        const encryptedMessage = nacl.box(data, nonce, recipientDHPubKey, edhConvertedSecretKey);
+
+        // Note that the ciphertext is already authenticated for the ephemeral key - but we want it authenticated by
+        //  the ed25519 key which the user interacts with. A signature over H(ciphertext | edhPubKey)
+        //  would be enough
+        const authMessage = crypto.createHash('sha256').update(
+            Buffer.concat([encryptedMessage, edhPair.publicKey])
+        ).digest();
+
+        const signature = authSecretKey.sign(authMessage);
+
+        return new X25519EncryptedData({
+            version: PubKeyEncVersion,
+            nonce: Buffer.from(nonce).toString('hex'),
+            cipher: PubKeyEncCipher,
+            ciphertext: Buffer.from(encryptedMessage).toString('hex'),
+            mac: signature.toString('hex'),
+            identities: {
+                recipient: recipientPubKey.hex(),
+                ephemeralPubKey: Buffer.from(edhPair.publicKey).toString('hex'),
+                originatorPubKey: authSecretKey.generatePublicKey().hex(),
+            }
+        });
+    }
+}

src-wallet/crypto/randomness.ts

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+import { utils } from "@noble/ed25519";
+import { v4 as uuidv4 } from "uuid";
+const crypto = require("crypto");
+
+export class Randomness {
+  salt: Buffer;
+  iv: Buffer;
+  id: string;
+
+  constructor(init?: Partial<Randomness>) {
+    this.salt = init?.salt || Buffer.from(utils.randomBytes(32));
+    this.iv = init?.iv || Buffer.from(utils.randomBytes(16));
+    this.id = init?.id || uuidv4({ random: crypto.randomBytes(16) });
+  }
+}