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Further cleanup of sym_encrypted_integrity_protected.js

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This commit is contained in:
Tankred Hase 2016-02-04 15:38:40 +07:00
parent 261db8035d
commit 3bf421206b
1 changed files with 19 additions and 23 deletions
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42
src/packet/sym_encrypted_integrity_protected.js
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@ -91,28 +91,24 @@ SymEncryptedIntegrityProtected.prototype.encrypt = function (sessionKeyAlgorithm
// This could probably be cleaned up to use less memory
var tohash = util.concatUint8Array([bytes, mdc]);
var hash = crypto.hash.sha1(util.concatUint8Array([prefix, tohash]));
tohash = util.concatUint8Array([tohash, hash]);
// AES optimizations. Native code for node, asmCrypto for browser.
if(sessionKeyAlgorithm.substr(0,3) === 'aes') {
if(sessionKeyAlgorithm.substr(0,3) === 'aes') { // AES optimizations. Native code for node, asmCrypto for browser.
var blockSize = crypto.cipher[sessionKeyAlgorithm].blockSize;
// Node crypto library. Not clear that it is faster than asmCrypto
if(nodeCrypto) {
if(nodeCrypto) { // Node crypto library. Only loaded if config.useNative === true
var cipherObj = new nodeCrypto.createCipheriv('aes-' + sessionKeyAlgorithm.substr(3,3) + '-cfb',
new Buffer(key), new Buffer(new Uint8Array(blockSize)));
this.encrypted = new Uint8Array(cipherObj.update(new Buffer(util.concatUint8Array([prefix, tohash]))));
}
else {
} else { // asm.js fallback
this.encrypted = asmCrypto.AES_CFB.encrypt(util.concatUint8Array([prefix, tohash]), key);
}
}
else {
this.encrypted = crypto.cfb.encrypt(prefixrandom,
sessionKeyAlgorithm, tohash, key, false).subarray(0,
prefix.length + tohash.length);
} else {
this.encrypted = crypto.cfb.encrypt(prefixrandom, sessionKeyAlgorithm, tohash, key, false)
.subarray(0, prefix.length + tohash.length);
}
};
@ -127,24 +123,24 @@ SymEncryptedIntegrityProtected.prototype.encrypt = function (sessionKeyAlgorithm
*/
SymEncryptedIntegrityProtected.prototype.decrypt = function (sessionKeyAlgorithm, key) {
var decrypted;
// AES optimizations. Native code for node, asmCrypto for browser.
if(sessionKeyAlgorithm.substr(0,3) === 'aes') {
if(sessionKeyAlgorithm.substr(0,3) === 'aes') { // AES optimizations. Native code for node, asmCrypto for browser.
var blockSize = crypto.cipher[sessionKeyAlgorithm].blockSize;
// Node crypto library. Not clear that it is faster than asmCrypto
if(nodeCrypto) {
if(nodeCrypto) { // Node crypto library. Only loaded if config.useNative === true
var decipherObj = new nodeCrypto.createDecipheriv('aes-' + sessionKeyAlgorithm.substr(3,3) + '-cfb',
new Buffer(key), new Buffer(new Uint8Array(blockSize)));
decrypted = new Uint8Array(decipherObj.update(new Buffer(this.encrypted)));
}
else {
} else { // asm.js fallback
decrypted = asmCrypto.AES_CFB.decrypt(this.encrypted, key);
}
// Remove random prefix
decrypted = decrypted.subarray(blockSize + 2, decrypted.length);
}
else {
decrypted = crypto.cfb.decrypt(
sessionKeyAlgorithm, key, this.encrypted, false);
} else {
decrypted = crypto.cfb.decrypt(sessionKeyAlgorithm, key, this.encrypted, false);
}
// there must be a modification detection code packet as the