ipfs storage for images and other nontext items. for use with etica - runs on etica network and currencys
https://collect.etica-stats.org
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59 lines
2.7 KiB
59 lines
2.7 KiB
"use strict"; |
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Object.defineProperty(exports, "__esModule", { value: true }); |
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exports.findGroupHash = exports.groupHash = exports.jubjub = void 0; |
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/*! noble-curves - MIT License (c) 2022 Paul Miller (paulmillr.com) */ |
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const sha512_1 = require("@noble/hashes/sha512"); |
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const utils_1 = require("@noble/hashes/utils"); |
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const edwards_js_1 = require("./abstract/edwards.js"); |
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const blake2s_1 = require("@noble/hashes/blake2s"); |
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const modular_js_1 = require("./abstract/modular.js"); |
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/** |
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* jubjub Twisted Edwards curve. |
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* https://neuromancer.sk/std/other/JubJub |
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* jubjub does not use EdDSA, so `hash`/sha512 params are passed because interface expects them. |
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*/ |
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exports.jubjub = (0, edwards_js_1.twistedEdwards)({ |
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// Params: a, d |
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a: BigInt('0x73eda753299d7d483339d80809a1d80553bda402fffe5bfeffffffff00000000'), |
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d: BigInt('0x2a9318e74bfa2b48f5fd9207e6bd7fd4292d7f6d37579d2601065fd6d6343eb1'), |
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// Finite field 𝔽p over which we'll do calculations |
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// Same value as bls12-381 Fr (not Fp) |
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Fp: (0, modular_js_1.Field)(BigInt('0x73eda753299d7d483339d80809a1d80553bda402fffe5bfeffffffff00000001')), |
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// Subgroup order: how many points curve has |
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n: BigInt('0xe7db4ea6533afa906673b0101343b00a6682093ccc81082d0970e5ed6f72cb7'), |
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// Cofactor |
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h: BigInt(8), |
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// Base point (x, y) aka generator point |
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Gx: BigInt('0x11dafe5d23e1218086a365b99fbf3d3be72f6afd7d1f72623e6b071492d1122b'), |
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Gy: BigInt('0x1d523cf1ddab1a1793132e78c866c0c33e26ba5cc220fed7cc3f870e59d292aa'), |
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hash: sha512_1.sha512, |
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randomBytes: utils_1.randomBytes, |
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}); |
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const GH_FIRST_BLOCK = (0, utils_1.utf8ToBytes)('096b36a5804bfacef1691e173c366a47ff5ba84a44f26ddd7e8d9f79d5b42df0'); |
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// Returns point at JubJub curve which is prime order and not zero |
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function groupHash(tag, personalization) { |
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const h = blake2s_1.blake2s.create({ personalization, dkLen: 32 }); |
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h.update(GH_FIRST_BLOCK); |
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h.update(tag); |
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// NOTE: returns ExtendedPoint, in case it will be multiplied later |
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let p = exports.jubjub.ExtendedPoint.fromHex(h.digest()); |
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// NOTE: cannot replace with isSmallOrder, returns Point*8 |
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p = p.multiply(exports.jubjub.CURVE.h); |
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if (p.equals(exports.jubjub.ExtendedPoint.ZERO)) |
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throw new Error('Point has small order'); |
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return p; |
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} |
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exports.groupHash = groupHash; |
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function findGroupHash(m, personalization) { |
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const tag = (0, utils_1.concatBytes)(m, new Uint8Array([0])); |
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for (let i = 0; i < 256; i++) { |
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tag[tag.length - 1] = i; |
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try { |
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return groupHash(tag, personalization); |
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} |
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catch (e) { } |
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} |
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throw new Error('findGroupHash tag overflow'); |
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} |
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exports.findGroupHash = findGroupHash; |
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//# sourceMappingURL=jubjub.js.map
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