72 lines
2 KiB
JavaScript
72 lines
2 KiB
JavaScript
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var bigi = require('bigi')
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var ecurve = require('ecurve')
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var typeforce = require('typeforce')
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function nBuffer (value, n) {
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if (!Buffer.isBuffer(value)) return false
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if (value.length !== n) throw new Error('Expected ' + (n * 8) + '-bit Buffer, got ' + (value.length * 8) + '-bit')
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return true
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}
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function Hash160bit (value) { return nBuffer(value, 20) }
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function Hash256bit (value) { return nBuffer(value, 32) }
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function Buffer256bit (value) { return nBuffer(value, 32) }
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var UINT53_MAX = Math.pow(2, 53) - 1
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function UInt2 (value) { return (value & 3) === value }
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function UInt8 (value) { return (value & 0xff) === value }
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function UInt32 (value) { return (value >>> 0) === value }
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function UInt53 (value) {
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return typeforce.Number(value) &&
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value >= 0 &&
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value <= UINT53_MAX &&
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Math.floor(value) === value
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}
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// external dependent types
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function BigInt (value) { return !typeforce.Null(value) && value.constructor === bigi }
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function ECCurve (value) { return !typeforce.Null(value) && value.constructor === ecurve.Curve }
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function ECPoint (value) { return !typeforce.Null(value) && value.constructor === ecurve.Point }
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// exposed, external API
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var ECSignature = typeforce.compile({ r: BigInt, s: BigInt })
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var Network = typeforce.compile({
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messagePrefix: typeforce.oneOf(typeforce.Buffer, typeforce.String),
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bip32: {
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public: UInt32,
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private: UInt32
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},
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pubKeyHash: UInt8,
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scriptHash: UInt8,
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wif: UInt8,
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dustThreshold: typeforce.Number
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})
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var Script = typeforce.compile({
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buffer: typeforce.Buffer,
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chunks: typeforce.arrayOf(typeforce.oneOf(typeforce.Number, typeforce.Buffer))
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})
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// extend typeforce types with ours
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var types = {
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BigInt: BigInt,
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Buffer256bit: Buffer256bit,
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ECCurve: ECCurve,
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ECPoint: ECPoint,
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ECSignature: ECSignature,
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Hash160bit: Hash160bit,
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Hash256bit: Hash256bit,
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Network: Network,
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Script: Script,
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UInt2: UInt2,
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UInt8: UInt8,
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UInt32: UInt32,
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UInt53: UInt53
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}
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for (var typeName in typeforce) {
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types[typeName] = typeforce[typeName]
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}
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module.exports = types
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