mirror of
https://github.com/fluencelabs/js-libp2p-crypto
synced 2025-03-15 18:31:08 +00:00
00477e3bcb
* perf: remove asn1.js from rsa * fix: tweaks * fix: it works, but I do not know 100% why * chore: remove asn1.js * fix: ensure jwk params encoded as uint * fix: util tests * fix: zero pad base64urlToBuffer * fix: more zero pad * test: add round trip test * test: base64url to Buffer with padding
56 lines
1.8 KiB
JavaScript
56 lines
1.8 KiB
JavaScript
'use strict'
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const { Buffer } = require('buffer')
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require('node-forge/lib/util')
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require('node-forge/lib/jsbn')
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const forge = require('node-forge/lib/forge')
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exports.bigIntegerToUintBase64url = (num, len) => {
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// Call `.abs()` to convert to unsigned
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let buf = Buffer.from(num.abs().toByteArray()) // toByteArray converts to big endian
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// toByteArray() gives us back a signed array, which will include a leading 0
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// byte if the most significant bit of the number is 1:
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// https://docs.microsoft.com/en-us/windows/win32/seccertenroll/about-integer
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// Our number will always be positive so we should remove the leading padding.
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buf = buf[0] === 0 ? buf.slice(1) : buf
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if (len != null) {
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if (buf.length > len) throw new Error('byte array longer than desired length')
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buf = Buffer.concat([Buffer.alloc(len - buf.length), buf])
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}
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return exports.bufferToBase64url(buf)
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}
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// Convert a Buffer to a base64 encoded string without padding
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// Adapted from https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-41#appendix-C
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exports.bufferToBase64url = buf => {
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return buf
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.toString('base64')
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.split('=')[0] // Remove any trailing '='s
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.replace(/\+/g, '-') // 62nd char of encoding
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.replace(/\//g, '_') // 63rd char of encoding
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}
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// Convert a base64url encoded string to a BigInteger
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exports.base64urlToBigInteger = str => {
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const buf = exports.base64urlToBuffer(str)
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return new forge.jsbn.BigInteger(buf.toString('hex'), 16)
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}
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exports.base64urlToBuffer = (str, len) => {
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str = (str + '==='.slice((str.length + 3) % 4))
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.replace(/-/g, '+')
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.replace(/_/g, '/')
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let buf = Buffer.from(str, 'base64')
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if (len != null) {
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if (buf.length > len) throw new Error('byte array longer than desired length')
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buf = Buffer.concat([Buffer.alloc(len - buf.length), buf])
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}
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return buf
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}
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