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47 lines
1.7 KiB
JavaScript
47 lines
1.7 KiB
JavaScript
/* global window, libsignal, textsecure */
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// eslint-disable-next-line func-names
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(function() {
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window.libloki = window.libloki || {};
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const IV_LENGTH = 16;
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FallBackSessionCipher = function (address) {
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this.pubKey = StringView.hexToArrayBuffer(address.getName());
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this.encrypt = async (plaintext) => {
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const myKeyPair = await textsecure.storage.protocol.getIdentityKeyPair();
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const myPrivateKey = myKeyPair.privKey;
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const symmetricKey = libsignal.Curve.calculateAgreement(this.pubKey, myPrivateKey);
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const iv = libsignal.crypto.getRandomBytes(IV_LENGTH);
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const ciphertext = await libsignal.crypto.encrypt(symmetricKey, plaintext, iv);
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const ivAndCiphertext = new Uint8Array(
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iv.byteLength + ciphertext.byteLength
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);
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ivAndCiphertext.set(new Uint8Array(iv));
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ivAndCiphertext.set(
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new Uint8Array(ciphertext),
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iv.byteLength
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);
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return {
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type : 6, //friend request
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body : new dcodeIO.ByteBuffer.wrap(ivAndCiphertext).toString('binary'),
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registrationId : null
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};
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},
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this.decrypt = async (ivAndCiphertext) => {
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const iv = ivAndCiphertext.slice(0, IV_LENGTH);
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const cipherText = ivAndCiphertext.slice(IV_LENGTH);
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const myKeyPair = await textsecure.storage.protocol.getIdentityKeyPair();
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const myPrivateKey = myKeyPair.privKey;
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const symmetricKey = libsignal.Curve.calculateAgreement(this.pubKey, myPrivateKey);
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const plaintext = await libsignal.crypto.decrypt(symmetricKey, cipherText, iv);
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return plaintext;
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}
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}
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window.libloki.FallBackSessionCipher = FallBackSessionCipher;
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})(); |