@bsv/sdk/dist/esm/src/compat/BSM.js

BSV Blockchain Software Development Kit

import BigNumber from '../primitives/BigNumber.js';
import { Writer, toArray } from '../primitives/utils.js';
import * as ECDSA from '../primitives/ECDSA.js';
import * as Hash from '../primitives/Hash.js';
const prefix = 'Bitcoin Signed Message:\n';
/**
 * Generates a SHA256 double-hash of the prefixed message.
 * @deprecated Replaced by BRC-77 which uses a more secure and private method for message signing.
 * @param messageBuf The message buffer to be hashed.
 * @returns The double-hash of the prefixed message as a number array.
 */
export const magicHash = (messageBuf) => {
    const bw = new Writer();
    bw.writeVarIntNum(prefix.length);
    bw.write(toArray(prefix, 'utf8'));
    bw.writeVarIntNum(messageBuf.length);
    bw.write(messageBuf);
    const buf = bw.toArray();
    const hashBuf = Hash.hash256(buf);
    return hashBuf;
};
/**
 * Signs a BSM message using the given private key.
 * @deprecated Replaced by BRC-77 which employs BRC-42 key derivation and BRC-43 invoice numbers for enhanced security and privacy.
 * @param message The message to be signed as a number array.
 * @param privateKey The private key used for signing the message.
 * @param mode The mode of operation. When "base64", the BSM format signature is returned. When "raw", a Signature object is returned. Default: "base64".
 * @returns The signature object when in raw mode, or the BSM base64 string when in base64 mode.
 */
export const sign = (message, privateKey, mode = 'base64') => {
    const hashBuf = magicHash(message);
    const sig = ECDSA.sign(new BigNumber(hashBuf), privateKey, true);
    if (mode === 'raw') {
        return sig;
    }
    const h = new BigNumber(hashBuf);
    const r = sig.CalculateRecoveryFactor(privateKey.toPublicKey(), h);
    return sig.toCompact(r, true, 'base64');
};
/**
 * Verifies a BSM signed message using the given public key.
 * @deprecated Replaced by BRC-77 which provides privately-verifiable signatures and avoids key reuse.
 * @param message The message to be verified as a number array.
 * @param sig The signature object.
 * @param pubKey The public key for verification.
 * @returns True if the signature is valid, false otherwise.
 */
export const verify = (message, sig, pubKey) => {
    const hashBuf = magicHash(message);
    return ECDSA.verify(new BigNumber(hashBuf), sig, pubKey);
};
//# sourceMappingURL=BSM.js.map