37 lines
1.3 KiB
TypeScript
37 lines
1.3 KiB
TypeScript
import * as plugins from './isohash.plugins.js';
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const hex = (buffer: ArrayBuffer) => {
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const hexCodes = [];
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const view = new DataView(buffer);
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for (let i = 0; i < view.byteLength; i += 4) {
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// Using getUint32 reduces the number of iterations needed (we process 4 bytes each time)
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const value = view.getUint32(i);
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// toString(16) will give the hex representation of the number without padding
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const stringValue = value.toString(16);
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// We use concatenation and slice for padding
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const padding = '00000000';
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const paddedValue = (padding + stringValue).slice(-padding.length);
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hexCodes.push(paddedValue);
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}
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// Join all the hex strings into one
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return hexCodes.join("");
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};
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/**
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* Computes sha256 Hash from String
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*/
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export const sha256FromString = async (stringArg: string): Promise<string> => {
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const smartenv = new plugins.smartenv.Smartenv();
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if (smartenv.isBrowser) {
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// Get the string as arraybuffer.
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const buffer = (new TextEncoder()).encode(stringArg);
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const hash = await crypto.subtle.digest("SHA-256", buffer);
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const result = hex(hash);
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return result;
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} else if (smartenv.isNode) {
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const smarthashModule = await smartenv.getSafeNodeModule('@pushrocks/smarthash');
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const result = await smarthashModule.sha256FromString(stringArg);
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return result;
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}
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}; |