43 lines
1.6 KiB
JavaScript
43 lines
1.6 KiB
JavaScript
// nip04.ts
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import { randomBytes } from "@noble/hashes/utils";
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import { secp256k1 } from "@noble/curves/secp256k1";
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import { base64 } from "@scure/base";
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// utils.ts
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var utf8Decoder = new TextDecoder("utf-8");
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var utf8Encoder = new TextEncoder();
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// nip04.ts
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if (typeof crypto !== "undefined" && !crypto.subtle && crypto.webcrypto) {
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crypto.subtle = crypto.webcrypto.subtle;
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}
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async function encrypt(privkey, pubkey, text) {
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const key = secp256k1.getSharedSecret(privkey, "02" + pubkey);
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const normalizedKey = getNormalizedX(key);
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let iv = Uint8Array.from(randomBytes(16));
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let plaintext = utf8Encoder.encode(text);
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let cryptoKey = await crypto.subtle.importKey("raw", normalizedKey, { name: "AES-CBC" }, false, ["encrypt"]);
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let ciphertext = await crypto.subtle.encrypt({ name: "AES-CBC", iv }, cryptoKey, plaintext);
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let ctb64 = base64.encode(new Uint8Array(ciphertext));
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let ivb64 = base64.encode(new Uint8Array(iv.buffer));
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return `${ctb64}?iv=${ivb64}`;
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}
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async function decrypt(privkey, pubkey, data) {
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let [ctb64, ivb64] = data.split("?iv=");
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let key = secp256k1.getSharedSecret(privkey, "02" + pubkey);
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let normalizedKey = getNormalizedX(key);
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let cryptoKey = await crypto.subtle.importKey("raw", normalizedKey, { name: "AES-CBC" }, false, ["decrypt"]);
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let ciphertext = base64.decode(ctb64);
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let iv = base64.decode(ivb64);
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let plaintext = await crypto.subtle.decrypt({ name: "AES-CBC", iv }, cryptoKey, ciphertext);
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let text = utf8Decoder.decode(plaintext);
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return text;
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}
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function getNormalizedX(key) {
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return key.slice(1, 33);
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}
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export {
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decrypt,
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encrypt
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};
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