o1js/dist/node/mina-signer/src/memo.js

TypeScript framework for zk-SNARKs and zkApps

import { defineBinable, stringFromBytes, stringLengthInBytes, stringToBytes, withBits, } from '../../bindings/lib/binable.js';
import { base58 } from '../../lib/util/base58.js';
import { HashInputLegacy, hashWithPrefix, packToFieldsLegacy, prefixes, } from './poseidon-bigint.js';
import { versionBytes } from '../../bindings/crypto/constants.js';
export { Memo };
function fromString(memo) {
    let length = stringLengthInBytes(memo);
    if (length > 32)
        throw Error('Memo.fromString: string too long');
    return `\x01${String.fromCharCode(length)}${memo}` + '\x00'.repeat(32 - length);
}
function toString(memo) {
    let totalLength = stringLengthInBytes(memo);
    if (totalLength !== 34) {
        throw Error(`Memo.toString: length ${totalLength} does not equal 34`);
    }
    if (memo[0] !== '\x01') {
        throw Error('Memo.toString: expected memo to start with 0x01 byte');
    }
    let length = memo.charCodeAt(1);
    if (length > 32)
        throw Error('Memo.toString: invalid length encoding');
    let bytes = stringToBytes(memo).slice(2, 2 + length);
    return stringFromBytes(bytes);
}
function hash(memo) {
    let bits = Memo.toBits(memo);
    let fields = packToFieldsLegacy(HashInputLegacy.bits(bits));
    return hashWithPrefix(prefixes.zkappMemo, fields);
}
const SIZE = 34;
const Binable = defineBinable({
    toBytes(memo) {
        return stringToBytes(memo);
    },
    readBytes(bytes, start) {
        let end = start + SIZE;
        let memo = stringFromBytes(bytes.slice(start, end));
        return [memo, end];
    },
});
const Memo = {
    fromString,
    toString,
    hash,
    ...withBits(Binable, SIZE * 8),
    ...base58(Binable, versionBytes.userCommandMemo),
    sizeInBytes: SIZE,
    empty() {
        return Memo.fromString('');
    },
    toValidString(memo = '') {
        if (stringLengthInBytes(memo) > 32)
            throw Error('Memo: string too long');
        return memo;
    },
};
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