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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | 28x 28x 28x 28x 28x 28x 28x 28x 28x | import AESCrypto from './aes-crypto';
import FastAESKey from './fast-aes-key';
import AESDecryptor from './aes-decryptor';
import { ErrorTypes, ErrorDetails } from '../errors';
import { logger } from '../utils/logger';
/* globals self: false */
class Decrypter {
constructor (observer, config, { removePKCS7Padding = true } = {}) {
this.logEnabled = true;
this.observer = observer;
this.config = config;
this.removePKCS7Padding = removePKCS7Padding;
// built in decryptor expects PKCS7 padding
Eif (removePKCS7Padding) {
try {
const browserCrypto = crypto || self.crypto;
this.subtle = browserCrypto.subtle || browserCrypto.webkitSubtle;
} catch (e) {}
}
this.disableWebCrypto = !this.subtle;
}
isSync () {
return (this.disableWebCrypto && this.config.enableSoftwareAES);
}
decrypt (data, key, iv, callback) {
if (this.disableWebCrypto && this.config.enableSoftwareAES) {
if (this.logEnabled) {
logger.log('JS AES decrypt');
this.logEnabled = false;
}
let decryptor = this.decryptor;
if (!decryptor)
this.decryptor = decryptor = new AESDecryptor();
decryptor.expandKey(key);
callback(decryptor.decrypt(data, 0, iv, this.removePKCS7Padding));
} else {
if (this.logEnabled) {
logger.log('WebCrypto AES decrypt');
this.logEnabled = false;
}
const subtle = this.subtle;
if (this.key !== key) {
this.key = key;
this.fastAesKey = new FastAESKey(subtle, key);
}
this.fastAesKey.expandKey()
.then((aesKey) => {
// decrypt using web crypto
let crypto = new AESCrypto(subtle, iv);
crypto.decrypt(data, aesKey)
.catch((err) => {
this.onWebCryptoError(err, data, key, iv, callback);
})
.then((result) => {
callback(result);
});
})
.catch((err) => {
this.onWebCryptoError(err, data, key, iv, callback);
});
}
}
onWebCryptoError (err, data, key, iv, callback) {
if (this.config.enableSoftwareAES) {
logger.log('WebCrypto Error, disable WebCrypto API');
this.disableWebCrypto = true;
this.logEnabled = true;
this.decrypt(data, key, iv, callback);
} else {
logger.error(`decrypting error : ${err.message}`);
this.observer.trigger(Event.ERROR, { type: ErrorTypes.MEDIA_ERROR, details: ErrorDetails.FRAG_DECRYPT_ERROR, fatal: true, reason: err.message });
}
}
destroy () {
let decryptor = this.decryptor;
if (decryptor) {
decryptor.destroy();
this.decryptor = undefined;
}
}
}
export default Decrypter;
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