symbol/KeyPair.js

  1. import { PrivateKey, PublicKey, Signature } from '../CryptoTypes.js';
  2. import ed25519 from '../impl/ed25519.js';
  3. import { deepCompare } from '../utils/arrayHelpers.js';
  5. const HASH_MODE = 'Sha2_512';
  7. /**
  8.  * Represents an ED25519 private and public key.
  9.  */
  10. export class KeyPair {
  11. 	/**
  12. 	 * Creates a key pair from a private key.
  13. 	 * @param {PrivateKey} privateKey Private key.
  14. 	 */
  15. 	constructor(privateKey) {
  16. 		/**
  17. 		 * @private
  18. 		 */
  19. 		this._privateKey = privateKey;
  21. 		/**
  22. 		 * @private
  23. 		 */
  24. 		this._keyPair = ed25519.get().keyPairFromSeed(HASH_MODE, this._privateKey.bytes);
  25. 	}
  27. 	/**
  28. 	 * Gets the public key.
  29. 	 * @returns {PublicKey} Public key.
  30. 	 */
  31. 	get publicKey() {
  32. 		return new PublicKey(this._keyPair.publicKey);
  33. 	}
  35. 	/**
  36. 	 * Gets the private key.
  37. 	 * @returns {PrivateKey} Private key.
  38. 	 */
  39. 	get privateKey() {
  40. 		return new PrivateKey(this._privateKey.bytes);
  41. 	}
  43. 	/**
  44. 	 * Signs a message with the private key.
  45. 	 * @param {Uint8Array} message Message to sign.
  46. 	 * @returns {Signature} Message signature.
  47. 	 */
  48. 	sign(message) {
  49. 		return new Signature(ed25519.get().sign(HASH_MODE, message, this._keyPair));
  50. 	}
  51. }
  53. /**
  54.  * Verifies signatures signed by a single key pair.
  55.  */
  56. export class Verifier {
  57. 	/**
  58. 	 * Creates a verifier from a public key.
  59. 	 * @param {PublicKey} publicKey Public key.
  60. 	 */
  61. 	constructor(publicKey) {
  62. 		if (0 === deepCompare(new Uint8Array(PublicKey.SIZE), publicKey.bytes))
  63. 			throw new Error('public key cannot be zero');
  65. 		/**
  66. 		 * Public key used for signature verification.
  67. 		 * @type PublicKey
  68. 		 */
  69. 		this.publicKey = publicKey;
  70. 	}
  72. 	/**
  73. 	 * Verifies a message signature.
  74. 	 * @param {Uint8Array} message Message to verify.
  75. 	 * @param {Signature} signature Signature to verify.
  76. 	 * @returns {boolean} true if the message signature verifies.
  77. 	 */
  78. 	verify(message, signature) {
  79. 		return ed25519.get().verify(HASH_MODE, message, signature.bytes, this.publicKey.bytes);
  80. 	}
  81. }