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Diffstat (limited to 'alarm/node_modules/node-forge/js/aesCipherSuites.js')
-rw-r--r-- | alarm/node_modules/node-forge/js/aesCipherSuites.js | 338 |
1 files changed, 0 insertions, 338 deletions
diff --git a/alarm/node_modules/node-forge/js/aesCipherSuites.js b/alarm/node_modules/node-forge/js/aesCipherSuites.js deleted file mode 100644 index 7087ca6..0000000 --- a/alarm/node_modules/node-forge/js/aesCipherSuites.js +++ /dev/null @@ -1,338 +0,0 @@ -/** - * A Javascript implementation of AES Cipher Suites for TLS. - * - * @author Dave Longley - * - * Copyright (c) 2009-2015 Digital Bazaar, Inc. - * - */ -(function() { -/* ########## Begin module implementation ########## */ -function initModule(forge) { - -var tls = forge.tls; - -/** - * Supported cipher suites. - */ -tls.CipherSuites['TLS_RSA_WITH_AES_128_CBC_SHA'] = { - id: [0x00,0x2f], - name: 'TLS_RSA_WITH_AES_128_CBC_SHA', - initSecurityParameters: function(sp) { - sp.bulk_cipher_algorithm = tls.BulkCipherAlgorithm.aes; - sp.cipher_type = tls.CipherType.block; - sp.enc_key_length = 16; - sp.block_length = 16; - sp.fixed_iv_length = 16; - sp.record_iv_length = 16; - sp.mac_algorithm = tls.MACAlgorithm.hmac_sha1; - sp.mac_length = 20; - sp.mac_key_length = 20; - }, - initConnectionState: initConnectionState -}; -tls.CipherSuites['TLS_RSA_WITH_AES_256_CBC_SHA'] = { - id: [0x00,0x35], - name: 'TLS_RSA_WITH_AES_256_CBC_SHA', - initSecurityParameters: function(sp) { - sp.bulk_cipher_algorithm = tls.BulkCipherAlgorithm.aes; - sp.cipher_type = tls.CipherType.block; - sp.enc_key_length = 32; - sp.block_length = 16; - sp.fixed_iv_length = 16; - sp.record_iv_length = 16; - sp.mac_algorithm = tls.MACAlgorithm.hmac_sha1; - sp.mac_length = 20; - sp.mac_key_length = 20; - }, - initConnectionState: initConnectionState -}; - -function initConnectionState(state, c, sp) { - var client = (c.entity === forge.tls.ConnectionEnd.client); - - // cipher setup - state.read.cipherState = { - init: false, - cipher: forge.cipher.createDecipher('AES-CBC', client ? - sp.keys.server_write_key : sp.keys.client_write_key), - iv: client ? sp.keys.server_write_IV : sp.keys.client_write_IV - }; - state.write.cipherState = { - init: false, - cipher: forge.cipher.createCipher('AES-CBC', client ? - sp.keys.client_write_key : sp.keys.server_write_key), - iv: client ? sp.keys.client_write_IV : sp.keys.server_write_IV - }; - state.read.cipherFunction = decrypt_aes_cbc_sha1; - state.write.cipherFunction = encrypt_aes_cbc_sha1; - - // MAC setup - state.read.macLength = state.write.macLength = sp.mac_length; - state.read.macFunction = state.write.macFunction = tls.hmac_sha1; -} - -/** - * Encrypts the TLSCompressed record into a TLSCipherText record using AES - * in CBC mode. - * - * @param record the TLSCompressed record to encrypt. - * @param s the ConnectionState to use. - * - * @return true on success, false on failure. - */ -function encrypt_aes_cbc_sha1(record, s) { - var rval = false; - - // append MAC to fragment, update sequence number - var mac = s.macFunction(s.macKey, s.sequenceNumber, record); - record.fragment.putBytes(mac); - s.updateSequenceNumber(); - - // TLS 1.1+ use an explicit IV every time to protect against CBC attacks - var iv; - if(record.version.minor === tls.Versions.TLS_1_0.minor) { - // use the pre-generated IV when initializing for TLS 1.0, otherwise use - // the residue from the previous encryption - iv = s.cipherState.init ? null : s.cipherState.iv; - } else { - iv = forge.random.getBytesSync(16); - } - - s.cipherState.init = true; - - // start cipher - var cipher = s.cipherState.cipher; - cipher.start({iv: iv}); - - // TLS 1.1+ write IV into output - if(record.version.minor >= tls.Versions.TLS_1_1.minor) { - cipher.output.putBytes(iv); - } - - // do encryption (default padding is appropriate) - cipher.update(record.fragment); - if(cipher.finish(encrypt_aes_cbc_sha1_padding)) { - // set record fragment to encrypted output - record.fragment = cipher.output; - record.length = record.fragment.length(); - rval = true; - } - - return rval; -} - -/** - * Handles padding for aes_cbc_sha1 in encrypt mode. - * - * @param blockSize the block size. - * @param input the input buffer. - * @param decrypt true in decrypt mode, false in encrypt mode. - * - * @return true on success, false on failure. - */ -function encrypt_aes_cbc_sha1_padding(blockSize, input, decrypt) { - /* The encrypted data length (TLSCiphertext.length) is one more than the sum - of SecurityParameters.block_length, TLSCompressed.length, - SecurityParameters.mac_length, and padding_length. - - The padding may be any length up to 255 bytes long, as long as it results in - the TLSCiphertext.length being an integral multiple of the block length. - Lengths longer than necessary might be desirable to frustrate attacks on a - protocol based on analysis of the lengths of exchanged messages. Each uint8 - in the padding data vector must be filled with the padding length value. - - The padding length should be such that the total size of the - GenericBlockCipher structure is a multiple of the cipher's block length. - Legal values range from zero to 255, inclusive. This length specifies the - length of the padding field exclusive of the padding_length field itself. - - This is slightly different from PKCS#7 because the padding value is 1 - less than the actual number of padding bytes if you include the - padding_length uint8 itself as a padding byte. */ - if(!decrypt) { - // get the number of padding bytes required to reach the blockSize and - // subtract 1 for the padding value (to make room for the padding_length - // uint8) - var padding = blockSize - (input.length() % blockSize); - input.fillWithByte(padding - 1, padding); - } - return true; -} - -/** - * Handles padding for aes_cbc_sha1 in decrypt mode. - * - * @param blockSize the block size. - * @param output the output buffer. - * @param decrypt true in decrypt mode, false in encrypt mode. - * - * @return true on success, false on failure. - */ -function decrypt_aes_cbc_sha1_padding(blockSize, output, decrypt) { - var rval = true; - if(decrypt) { - /* The last byte in the output specifies the number of padding bytes not - including itself. Each of the padding bytes has the same value as that - last byte (known as the padding_length). Here we check all padding - bytes to ensure they have the value of padding_length even if one of - them is bad in order to ward-off timing attacks. */ - var len = output.length(); - var paddingLength = output.last(); - for(var i = len - 1 - paddingLength; i < len - 1; ++i) { - rval = rval && (output.at(i) == paddingLength); - } - if(rval) { - // trim off padding bytes and last padding length byte - output.truncate(paddingLength + 1); - } - } - return rval; -} - -/** - * Decrypts a TLSCipherText record into a TLSCompressed record using - * AES in CBC mode. - * - * @param record the TLSCipherText record to decrypt. - * @param s the ConnectionState to use. - * - * @return true on success, false on failure. - */ -var count = 0; -function decrypt_aes_cbc_sha1(record, s) { - var rval = false; - ++count; - - var iv; - if(record.version.minor === tls.Versions.TLS_1_0.minor) { - // use pre-generated IV when initializing for TLS 1.0, otherwise use the - // residue from the previous decryption - iv = s.cipherState.init ? null : s.cipherState.iv; - } else { - // TLS 1.1+ use an explicit IV every time to protect against CBC attacks - // that is appended to the record fragment - iv = record.fragment.getBytes(16); - } - - s.cipherState.init = true; - - // start cipher - var cipher = s.cipherState.cipher; - cipher.start({iv: iv}); - - // do decryption - cipher.update(record.fragment); - rval = cipher.finish(decrypt_aes_cbc_sha1_padding); - - // even if decryption fails, keep going to minimize timing attacks - - // decrypted data: - // first (len - 20) bytes = application data - // last 20 bytes = MAC - var macLen = s.macLength; - - // create a random MAC to check against should the mac length check fail - // Note: do this regardless of the failure to keep timing consistent - var mac = forge.random.getBytesSync(macLen); - - // get fragment and mac - var len = cipher.output.length(); - if(len >= macLen) { - record.fragment = cipher.output.getBytes(len - macLen); - mac = cipher.output.getBytes(macLen); - } else { - // bad data, but get bytes anyway to try to keep timing consistent - record.fragment = cipher.output.getBytes(); - } - record.fragment = forge.util.createBuffer(record.fragment); - record.length = record.fragment.length(); - - // see if data integrity checks out, update sequence number - var mac2 = s.macFunction(s.macKey, s.sequenceNumber, record); - s.updateSequenceNumber(); - rval = compareMacs(s.macKey, mac, mac2) && rval; - return rval; -} - -/** - * Safely compare two MACs. This function will compare two MACs in a way - * that protects against timing attacks. - * - * TODO: Expose elsewhere as a utility API. - * - * See: https://www.nccgroup.trust/us/about-us/newsroom-and-events/blog/2011/february/double-hmac-verification/ - * - * @param key the MAC key to use. - * @param mac1 as a binary-encoded string of bytes. - * @param mac2 as a binary-encoded string of bytes. - * - * @return true if the MACs are the same, false if not. - */ -function compareMacs(key, mac1, mac2) { - var hmac = forge.hmac.create(); - - hmac.start('SHA1', key); - hmac.update(mac1); - mac1 = hmac.digest().getBytes(); - - hmac.start(null, null); - hmac.update(mac2); - mac2 = hmac.digest().getBytes(); - - return mac1 === mac2; -} - -} // end module implementation - -/* ########## Begin module wrapper ########## */ -var name = 'aesCipherSuites'; -if(typeof define !== 'function') { - // NodeJS -> AMD - if(typeof module === 'object' && module.exports) { - var nodeJS = true; - define = function(ids, factory) { - factory(require, module); - }; - } else { - // <script> - if(typeof forge === 'undefined') { - forge = {}; - } - return initModule(forge); - } -} -// AMD -var deps; -var defineFunc = function(require, module) { - module.exports = function(forge) { - var mods = deps.map(function(dep) { - return require(dep); - }).concat(initModule); - // handle circular dependencies - forge = forge || {}; - forge.defined = forge.defined || {}; - if(forge.defined[name]) { - return forge[name]; - } - forge.defined[name] = true; - for(var i = 0; i < mods.length; ++i) { - mods[i](forge); - } - return forge[name]; - }; -}; -var tmpDefine = define; -define = function(ids, factory) { - deps = (typeof ids === 'string') ? factory.slice(2) : ids.slice(2); - if(nodeJS) { - delete define; - return tmpDefine.apply(null, Array.prototype.slice.call(arguments, 0)); - } - define = tmpDefine; - return define.apply(null, Array.prototype.slice.call(arguments, 0)); -}; -define(['require', 'module', './aes', './tls'], function() { - defineFunc.apply(null, Array.prototype.slice.call(arguments, 0)); -}); -})(); |