tornadocontrib/noble-curves
1
0
Fork 0
forked from tornado-packages/noble-curves
Code Pull Requests Activity

abstract/utils: reformat hexToBytes.

Browse Source
This commit is contained in:
Paul Miller 2023-09-13 23:57:34 +02:00 committed by GitHub
parent 1d83bab27d
commit c935b398fe
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 9 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
src/abstract/utils.ts
View File

@ -44,7 +44,8 @@ export function hexToNumber(hex: string): bigint {
return BigInt(hex === '' ? '0' : `0x${hex}`); return BigInt(hex === '' ? '0' : `0x${hex}`);
} }
const enum HexCharCode { // We use very optimized technique to convert hex string to byte array
const enum HexC {
ZERO = 48, // 0 ZERO = 48, // 0
NINE = 57, // 9 NINE = 57, // 9
A_UP = 65, // A A_UP = 65, // A
@ -54,15 +55,10 @@ const enum HexCharCode {
} }
function charCodeToBase16(char: number) { function charCodeToBase16(char: number) {
if (char >= HexCharCode.ZERO && char <= HexCharCode.NINE) { if (char >= HexC.ZERO && char <= HexC.NINE) return char - HexC.ZERO;
return char - HexCharCode.ZERO; else if (char >= HexC.A_UP && char <= HexC.F_UP) return char - (HexC.A_UP - 10);
} else if (char >= HexCharCode.A_UP && char <= HexCharCode.F_UP) { else if (char >= HexC.A_LO && char <= HexC.F_LO) return char - (HexC.A_LO - 10);
return char - (HexCharCode.A_UP - 10); throw new Error('Invalid byte sequence');
} else if (char >= HexCharCode.A_LO && char <= HexCharCode.F_LO) {
return char - (HexCharCode.A_LO - 10);
}
throw new Error('Invalid byte sequence.');
} }
/** /**
@ -72,8 +68,9 @@ export function hexToBytes(hex: string): Uint8Array {
if (typeof hex !== 'string') throw new Error('hex string expected, got ' + typeof hex); if (typeof hex !== 'string') throw new Error('hex string expected, got ' + typeof hex);
const len = hex.length; const len = hex.length;
if (len % 2) throw new Error('padded hex string expected, got unpadded hex of length ' + len); if (len % 2) throw new Error('padded hex string expected, got unpadded hex of length ' + len);
const array = new Uint8Array(len / 2); const al = len / 2;
for (let i = 0, j = 0, l = array.length; i < l; i++) { const array = new Uint8Array(al);
for (let i = 0, j = 0; i < al; i++) {
const n1 = charCodeToBase16(hex.charCodeAt(j++)); const n1 = charCodeToBase16(hex.charCodeAt(j++));
const n2 = charCodeToBase16(hex.charCodeAt(j++)); const n2 = charCodeToBase16(hex.charCodeAt(j++));
array[i] = n1 * 16 + n2; array[i] = n1 * 16 + n2;