create daemon

thrower_daemon/node_modules/@noble/curves/abstract/hash-to-curve.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.createHasher = exports.isogenyMap = exports.hash_to_field = exports.expand_message_xof = exports.expand_message_xmd = void 0;
+const modular_js_1 = require("./modular.js");
+const utils_js_1 = require("./utils.js");
+function validateDST(dst) {
+    if (dst instanceof Uint8Array)
+        return dst;
+    if (typeof dst === 'string')
+        return (0, utils_js_1.utf8ToBytes)(dst);
+    throw new Error('DST must be Uint8Array or string');
+}
+// Octet Stream to Integer. "spec" implementation of os2ip is 2.5x slower vs bytesToNumberBE.
+const os2ip = utils_js_1.bytesToNumberBE;
+// Integer to Octet Stream (numberToBytesBE)
+function i2osp(value, length) {
+    if (value < 0 || value >= 1 << (8 * length)) {
+        throw new Error(`bad I2OSP call: value=${value} length=${length}`);
+    }
+    const res = Array.from({ length }).fill(0);
+    for (let i = length - 1; i >= 0; i--) {
+        res[i] = value & 0xff;
+        value >>>= 8;
+    }
+    return new Uint8Array(res);
+}
+function strxor(a, b) {
+    const arr = new Uint8Array(a.length);
+    for (let i = 0; i < a.length; i++) {
+        arr[i] = a[i] ^ b[i];
+    }
+    return arr;
+}
+function isBytes(item) {
+    if (!(item instanceof Uint8Array))
+        throw new Error('Uint8Array expected');
+}
+function isNum(item) {
+    if (!Number.isSafeInteger(item))
+        throw new Error('number expected');
+}
+// Produces a uniformly random byte string using a cryptographic hash function H that outputs b bits
+// https://www.rfc-editor.org/rfc/rfc9380#section-5.3.1
+function expand_message_xmd(msg, DST, lenInBytes, H) {
+    isBytes(msg);
+    isBytes(DST);
+    isNum(lenInBytes);
+    // https://www.rfc-editor.org/rfc/rfc9380#section-5.3.3
+    if (DST.length > 255)
+        DST = H((0, utils_js_1.concatBytes)((0, utils_js_1.utf8ToBytes)('H2C-OVERSIZE-DST-'), DST));
+    const { outputLen: b_in_bytes, blockLen: r_in_bytes } = H;
+    const ell = Math.ceil(lenInBytes / b_in_bytes);
+    if (ell > 255)
+        throw new Error('Invalid xmd length');
+    const DST_prime = (0, utils_js_1.concatBytes)(DST, i2osp(DST.length, 1));
+    const Z_pad = i2osp(0, r_in_bytes);
+    const l_i_b_str = i2osp(lenInBytes, 2); // len_in_bytes_str
+    const b = new Array(ell);
+    const b_0 = H((0, utils_js_1.concatBytes)(Z_pad, msg, l_i_b_str, i2osp(0, 1), DST_prime));
+    b[0] = H((0, utils_js_1.concatBytes)(b_0, i2osp(1, 1), DST_prime));
+    for (let i = 1; i <= ell; i++) {
+        const args = [strxor(b_0, b[i - 1]), i2osp(i + 1, 1), DST_prime];
+        b[i] = H((0, utils_js_1.concatBytes)(...args));
+    }
+    const pseudo_random_bytes = (0, utils_js_1.concatBytes)(...b);
+    return pseudo_random_bytes.slice(0, lenInBytes);
+}
+exports.expand_message_xmd = expand_message_xmd;
+// Produces a uniformly random byte string using an extendable-output function (XOF) H.
+// 1. The collision resistance of H MUST be at least k bits.
+// 2. H MUST be an XOF that has been proved indifferentiable from
+//    a random oracle under a reasonable cryptographic assumption.
+// https://www.rfc-editor.org/rfc/rfc9380#section-5.3.2
+function expand_message_xof(msg, DST, lenInBytes, k, H) {
+    isBytes(msg);
+    isBytes(DST);
+    isNum(lenInBytes);
+    // https://www.rfc-editor.org/rfc/rfc9380#section-5.3.3
+    // DST = H('H2C-OVERSIZE-DST-' || a_very_long_DST, Math.ceil((lenInBytes * k) / 8));
+    if (DST.length > 255) {
+        const dkLen = Math.ceil((2 * k) / 8);
+        DST = H.create({ dkLen }).update((0, utils_js_1.utf8ToBytes)('H2C-OVERSIZE-DST-')).update(DST).digest();
+    }
+    if (lenInBytes > 65535 || DST.length > 255)
+        throw new Error('expand_message_xof: invalid lenInBytes');
+    return (H.create({ dkLen: lenInBytes })
+        .update(msg)
+        .update(i2osp(lenInBytes, 2))
+        // 2. DST_prime = DST || I2OSP(len(DST), 1)
+        .update(DST)
+        .update(i2osp(DST.length, 1))
+        .digest());
+}
+exports.expand_message_xof = expand_message_xof;
+/**
+ * Hashes arbitrary-length byte strings to a list of one or more elements of a finite field F
+ * https://www.rfc-editor.org/rfc/rfc9380#section-5.2
+ * @param msg a byte string containing the message to hash
+ * @param count the number of elements of F to output
+ * @param options `{DST: string, p: bigint, m: number, k: number, expand: 'xmd' | 'xof', hash: H}`, see above
+ * @returns [u_0, ..., u_(count - 1)], a list of field elements.
+ */
+function hash_to_field(msg, count, options) {
+    (0, utils_js_1.validateObject)(options, {
+        DST: 'stringOrUint8Array',
+        p: 'bigint',
+        m: 'isSafeInteger',
+        k: 'isSafeInteger',
+        hash: 'hash',
+    });
+    const { p, k, m, hash, expand, DST: _DST } = options;
+    isBytes(msg);
+    isNum(count);
+    const DST = validateDST(_DST);
+    const log2p = p.toString(2).length;
+    const L = Math.ceil((log2p + k) / 8); // section 5.1 of ietf draft link above
+    const len_in_bytes = count * m * L;
+    let prb; // pseudo_random_bytes
+    if (expand === 'xmd') {
+        prb = expand_message_xmd(msg, DST, len_in_bytes, hash);
+    }
+    else if (expand === 'xof') {
+        prb = expand_message_xof(msg, DST, len_in_bytes, k, hash);
+    }
+    else if (expand === '_internal_pass') {
+        // for internal tests only
+        prb = msg;
+    }
+    else {
+        throw new Error('expand must be "xmd" or "xof"');
+    }
+    const u = new Array(count);
+    for (let i = 0; i < count; i++) {
+        const e = new Array(m);
+        for (let j = 0; j < m; j++) {
+            const elm_offset = L * (j + i * m);
+            const tv = prb.subarray(elm_offset, elm_offset + L);
+            e[j] = (0, modular_js_1.mod)(os2ip(tv), p);
+        }
+        u[i] = e;
+    }
+    return u;
+}
+exports.hash_to_field = hash_to_field;
+function isogenyMap(field, map) {
+    // Make same order as in spec
+    const COEFF = map.map((i) => Array.from(i).reverse());
+    return (x, y) => {
+        const [xNum, xDen, yNum, yDen] = COEFF.map((val) => val.reduce((acc, i) => field.add(field.mul(acc, x), i)));
+        x = field.div(xNum, xDen); // xNum / xDen
+        y = field.mul(y, field.div(yNum, yDen)); // y * (yNum / yDev)
+        return { x, y };
+    };
+}
+exports.isogenyMap = isogenyMap;
+function createHasher(Point, mapToCurve, def) {
+    if (typeof mapToCurve !== 'function')
+        throw new Error('mapToCurve() must be defined');
+    return {
+        // Encodes byte string to elliptic curve.
+        // hash_to_curve from https://www.rfc-editor.org/rfc/rfc9380#section-3
+        hashToCurve(msg, options) {
+            const u = hash_to_field(msg, 2, { ...def, DST: def.DST, ...options });
+            const u0 = Point.fromAffine(mapToCurve(u[0]));
+            const u1 = Point.fromAffine(mapToCurve(u[1]));
+            const P = u0.add(u1).clearCofactor();
+            P.assertValidity();
+            return P;
+        },
+        // Encodes byte string to elliptic curve.
+        // encode_to_curve from https://www.rfc-editor.org/rfc/rfc9380#section-3
+        encodeToCurve(msg, options) {
+            const u = hash_to_field(msg, 1, { ...def, DST: def.encodeDST, ...options });
+            const P = Point.fromAffine(mapToCurve(u[0])).clearCofactor();
+            P.assertValidity();
+            return P;
+        },
+    };
+}
+exports.createHasher = createHasher;
+//# sourceMappingURL=hash-to-curve.js.map