s3-react/lib/signature.js

A React library for AWS S3 image upload

import Crypto from 'crypto-js';
export default class Signature {
    static getSignature(config, date, policyBase64) {
        const getSignatureKey = (Crypto, key, dateStamp, regionName) => {
            const kDate = Crypto.HmacSHA256(dateStamp, "AWS4" + key);
            const kRegion = Crypto.HmacSHA256(regionName, kDate);
            const kService = Crypto.HmacSHA256('s3', kRegion);
            const kSigning = Crypto.HmacSHA256("aws4_request", kService);
            return kSigning;
        };
        const signature = (policyEncoded) => {
            return Crypto.HmacSHA256(policyEncoded, getSignatureKey(Crypto, config.secretAccessKey, date, config.region)).toString(Crypto.enc.Hex);
        };
        return signature(policyBase64);
    }
}
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