103 lines
2.7 KiB
TypeScript
103 lines
2.7 KiB
TypeScript
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import { isEmptyData } from "./isEmptyData";
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import { SHA_256_HMAC_ALGO } from "./constants";
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import { Hash, SourceData } from "@aws-sdk/types";
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import { fromUtf8 } from "@aws-sdk/util-utf8-browser";
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import { CryptoOperation, Key, MsWindow } from "@aws-crypto/ie11-detection";
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import { locateWindow } from "@aws-sdk/util-locate-window";
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export class Sha256 implements Hash {
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private operation: Promise<CryptoOperation>;
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constructor(secret?: SourceData) {
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if (secret) {
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this.operation = getKeyPromise(secret).then(keyData =>
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(locateWindow() as MsWindow).msCrypto.subtle.sign(
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SHA_256_HMAC_ALGO,
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keyData
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)
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);
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this.operation.catch(() => {});
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} else {
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this.operation = Promise.resolve(
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(locateWindow() as MsWindow).msCrypto.subtle.digest("SHA-256")
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);
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}
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}
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update(toHash: SourceData): void {
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if (isEmptyData(toHash)) {
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return;
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}
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this.operation = this.operation.then(operation => {
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operation.onerror = () => {
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this.operation = Promise.reject(
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new Error("Error encountered updating hash")
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);
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};
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operation.process(toArrayBufferView(toHash));
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return operation;
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});
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this.operation.catch(() => {});
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}
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digest(): Promise<Uint8Array> {
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return this.operation.then<Uint8Array>(
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operation =>
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new Promise((resolve, reject) => {
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operation.onerror = () => {
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reject(new Error("Error encountered finalizing hash"));
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};
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operation.oncomplete = () => {
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if (operation.result) {
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resolve(new Uint8Array(operation.result));
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}
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reject(new Error("Error encountered finalizing hash"));
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};
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operation.finish();
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})
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);
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}
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}
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function getKeyPromise(secret: SourceData): Promise<Key> {
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return new Promise((resolve, reject) => {
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const keyOperation = (locateWindow() as MsWindow).msCrypto.subtle.importKey(
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"raw",
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toArrayBufferView(secret),
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SHA_256_HMAC_ALGO,
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false,
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["sign"]
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);
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keyOperation.oncomplete = () => {
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if (keyOperation.result) {
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resolve(keyOperation.result);
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}
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reject(new Error("ImportKey completed without importing key."));
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};
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keyOperation.onerror = () => {
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reject(new Error("ImportKey failed to import key."));
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};
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});
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}
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function toArrayBufferView(data: SourceData): Uint8Array {
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if (typeof data === "string") {
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return fromUtf8(data);
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}
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if (ArrayBuffer.isView(data)) {
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return new Uint8Array(
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data.buffer,
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data.byteOffset,
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data.byteLength / Uint8Array.BYTES_PER_ELEMENT
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);
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}
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return new Uint8Array(data);
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}
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