41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
// nip04.ts
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import { bytesToHex as bytesToHex2, randomBytes } from "@noble/hashes/utils";
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import { secp256k1 } from "@noble/curves/secp256k1";
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import { cbc } from "@noble/ciphers/aes";
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import { base64 } from "@scure/base";
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// utils.ts
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import { bytesToHex, hexToBytes } from "@noble/hashes/utils";
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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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function encrypt(secretKey, pubkey, text) {
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const privkey = secretKey instanceof Uint8Array ? bytesToHex2(secretKey) : secretKey;
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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 ciphertext = cbc(normalizedKey, iv).encrypt(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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function decrypt(secretKey, pubkey, data) {
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const privkey = secretKey instanceof Uint8Array ? bytesToHex2(secretKey) : secretKey;
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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 iv = base64.decode(ivb64);
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let ciphertext = base64.decode(ctb64);
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let plaintext = cbc(normalizedKey, iv).decrypt(ciphertext);
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return utf8Decoder.decode(plaintext);
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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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