jsonld-signatures-merkleproof2019
Version:
A jsonld signature implementation to support MerkleProof2019 verification in Verifiable Credential context
36 lines (35 loc) • 1.39 kB
JavaScript
export function toByteArray(hexString) {
hexString = hexString.trim(); // blockcerts-verifier #577 - strange bug where iOS on first load prepends a space...
const outArray = [];
const byteSize = 2;
for (let i = 0; i < hexString.length; i += byteSize) {
outArray.push(parseInt(hexString.substring(i, i + byteSize), 16));
}
return outArray;
}
export function toUTF8Data(str) {
const utf8 = [];
for (let i = 0; i < str.length; i++) {
let charcode = str.charCodeAt(i);
if (charcode < 0x80) {
utf8.push(charcode);
}
else if (charcode < 0x800) {
utf8.push(0xc0 | (charcode >> 6), 0x80 | (charcode & 0x3f));
}
else if (charcode < 0xd800 || charcode >= 0xe000) {
utf8.push(0xe0 | (charcode >> 12), 0x80 | ((charcode >> 6) & 0x3f), 0x80 | (charcode & 0x3f));
}
else {
// surrogate pair
i++;
// UTF-16 encodes 0x10000-0x10FFFF by
// subtracting 0x10000 and splitting the
// 20 bits of 0x0-0xFFFFF into two halves
charcode =
0x10000 + (((charcode & 0x3ff) << 10) | (str.charCodeAt(i) & 0x3ff));
utf8.push(0xf0 | (charcode >> 18), 0x80 | ((charcode >> 12) & 0x3f), 0x80 | ((charcode >> 6) & 0x3f), 0x80 | (charcode & 0x3f));
}
}
return utf8;
}