tedious
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A TDS driver, for connecting to MS SQLServer databases.
82 lines (80 loc) • 17.2 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.algorithmName = exports.AeadAes256CbcHmac256Algorithm = void 0;
var _types = require("./types");
var _crypto = require("crypto");
var _aeadAes256CbcHmacEncryptionKey = require("./aead-aes-256-cbc-hmac-encryption-key");
// This code is based on the `mssql-jdbc` library published under the conditions of MIT license.
// Copyright (c) 2019 Microsoft Corporation
const algorithmName = exports.algorithmName = 'AEAD_AES_256_CBC_HMAC_SHA256';
const algorithmVersion = 0x1;
const blockSizeInBytes = 16;
class AeadAes256CbcHmac256Algorithm {
constructor(columnEncryptionKey, encryptionType) {
this.keySizeInBytes = _aeadAes256CbcHmacEncryptionKey.keySize / 8;
this.version = Buffer.from([algorithmVersion]);
this.versionSize = Buffer.from([1]);
this.minimumCipherTextLengthInBytesNoAuthenticationTag = 1 + blockSizeInBytes + blockSizeInBytes;
this.minimumCipherTextLengthInBytesWithAuthenticationTag = this.minimumCipherTextLengthInBytesNoAuthenticationTag + this.keySizeInBytes;
this.columnEncryptionkey = columnEncryptionKey;
this.isDeterministic = encryptionType === _types.SQLServerEncryptionType.Deterministic;
}
encryptData(plaintText) {
let iv;
if (this.isDeterministic === true) {
const hmacIv = (0, _crypto.createHmac)('sha256', this.columnEncryptionkey.getIvKey());
hmacIv.update(plaintText);
iv = hmacIv.digest().slice(0, blockSizeInBytes);
} else {
iv = (0, _crypto.randomBytes)(blockSizeInBytes);
}
const encryptCipher = (0, _crypto.createCipheriv)('aes-256-cbc', this.columnEncryptionkey.getEncryptionKey(), iv);
const encryptedBuffer = Buffer.concat([encryptCipher.update(plaintText), encryptCipher.final()]);
const authenticationTag = this._prepareAuthenticationTag(iv, encryptedBuffer, 0, encryptedBuffer.length);
return Buffer.concat([Buffer.from([algorithmVersion]), authenticationTag, iv, encryptedBuffer]);
}
decryptData(cipherText) {
const iv = Buffer.alloc(blockSizeInBytes);
const minimumCiperTextLength = this.minimumCipherTextLengthInBytesWithAuthenticationTag;
if (cipherText.length < minimumCiperTextLength) {
throw new Error(`Specified ciphertext has an invalid size of ${cipherText.length} bytes, which is below the minimum ${minimumCiperTextLength} bytes required for decryption.`);
}
let startIndex = 0;
if (cipherText[0] !== algorithmVersion) {
throw new Error(`The specified ciphertext's encryption algorithm version ${Buffer.from([cipherText[0]]).toString('hex')} does not match the expected encryption algorithm version ${algorithmVersion}.`);
}
startIndex += 1;
let authenticationTagOffset = 0;
authenticationTagOffset = startIndex;
startIndex += this.keySizeInBytes;
cipherText.copy(iv, 0, startIndex, startIndex + iv.length);
startIndex += iv.length;
const cipherTextOffset = startIndex;
const cipherTextCount = cipherText.length - startIndex;
const authenticationTag = this._prepareAuthenticationTag(iv, cipherText, cipherTextOffset, cipherTextCount);
if (0 !== authenticationTag.compare(cipherText, authenticationTagOffset, Math.min(authenticationTagOffset + cipherTextCount, authenticationTagOffset + authenticationTag.length), 0, Math.min(cipherTextCount, authenticationTag.length))) {
throw new Error('Specified ciphertext has an invalid authentication tag.');
}
let plainText;
const decipher = (0, _crypto.createDecipheriv)('aes-256-cbc', this.columnEncryptionkey.getEncryptionKey(), iv);
try {
plainText = decipher.update(cipherText.slice(cipherTextOffset, cipherTextOffset + cipherTextCount));
plainText = Buffer.concat([plainText, decipher.final()]);
} catch (error) {
throw new Error(`Internal error while decryption: ${error.message}`);
}
return plainText;
}
_prepareAuthenticationTag(iv, cipherText, offset, length) {
const hmac = (0, _crypto.createHmac)('sha256', this.columnEncryptionkey.getMacKey());
hmac.update(this.version);
hmac.update(iv);
hmac.update(cipherText.slice(offset, offset + length));
hmac.update(this.versionSize);
return hmac.digest();
}
}
exports.AeadAes256CbcHmac256Algorithm = AeadAes256CbcHmac256Algorithm;
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startIndex;\n\n    const authenticationTag: Buffer = this._prepareAuthenticationTag(iv, cipherText, cipherTextOffset, cipherTextCount);\n\n    if (0 !== authenticationTag.compare(cipherText, authenticationTagOffset, Math.min(authenticationTagOffset + cipherTextCount, authenticationTagOffset + authenticationTag.length), 0, Math.min(cipherTextCount, authenticationTag.length))) {\n      throw new Error('Specified ciphertext has an invalid authentication tag.');\n    }\n\n    let plainText: Buffer;\n\n    const decipher = createDecipheriv('aes-256-cbc', this.columnEncryptionkey.getEncryptionKey(), iv);\n    try {\n      plainText = decipher.update(cipherText.slice(cipherTextOffset, cipherTextOffset + cipherTextCount));\n      plainText = Buffer.concat([plainText, decipher.final()]);\n    } catch (error: any) {\n      throw new Error(`Internal error while decryption: ${error.message}`);\n    }\n\n    return plainText;\n  }\n\n  _prepareAuthenticationTag(iv: Buffer, cipherText: Buffer, offset: number, length: number): Buffer {\n    const hmac = createHmac('sha256', this.columnEncryptionkey.getMacKey());\n\n    hmac.update(this.version);\n    hmac.update(iv);\n    hmac.update(cipherText.slice(offset, offset + length));\n    hmac.update(this.versionSize);\n    return hmac.digest();\n  }\n}\n"],"mappings":";;;;;;AAGA,IAAAA,MAAA,GAAAC,OAAA;AACA,IAAAC,OAAA,GAAAD,OAAA;AACA,IAAAE,+BAAA,GAAAF,OAAA;AALA;AACA;;AAMO,MAAMG,aAAa,GAAAC,OAAA,CAAAD,aAAA,GAAG,8BAA8B;AAC3D,MAAME,gBAAgB,GAAG,GAAG;AAC5B,MAAMC,gBAAgB,GAAG,EAAE;AAEpB,MAAMC,6BAA6B,CAAgC;EASxEC,WAAWA,CAACC,mBAAsD,EAAEC,cAAuC,EAAE;IAC3G,IAAI,CAACC,cAAc,GAAGC,uCAAO,GAAG,CAAC;IACjC,IAAI,CAACC,OAAO,GAAGC,MAAM,CAACC,IAAI,CAAC,CAACV,gBAAgB,CAAC,CAAC;IAC9C,IAAI,CAACW,WAAW,GAAGF,MAAM,CAACC,IAAI,CAAC,CAAC,CAAC,CAAC,CAAC;IACnC,IAAI,CAACE,iDAAiD,GAAG,CAAC,GAAGX,gBAAgB,GAAGA,gBAAgB;IAChG,IAAI,CAACY,mDAAmD,GAAG,IAAI,CAACD,iDAAiD,GAAG,IAAI,CAACN,cAAc;IACvI,IAAI,CAACQ,mBAAmB,GAAGV,mBAAmB;IAE9C,IAAI,CAACW,eAAe,GAAGV,cAAc,KAAKW,8BAAuB,CAACC,aAAa;EACjF;EAEAC,WAAWA,CAACC,UAAkB,EAAU;IACtC,IAAIC,EAAU;IAEd,IAAI,IAAI,CAACL,eAAe,KAAK,IAAI,EAAE;MACjC,MAAMM,MAAM,GAAG,IAAAC,kBAAU,EAAC,QAAQ,EAAE,IAAI,CAACR,mBAAmB,CAACS,QAAQ,CAAC,CAAC,CAAC;MACxEF,MAAM,CAACG,MAAM,CAACL,UAAU,CAAC;MACzBC,EAAE,GAAGC,MAAM,CAACI,MAAM,CAAC,CAAC,CAACC,KAAK,CAAC,CAAC,EAAEzB,gBAAgB,CAAC;IACjD,CAAC,MAAM;MACLmB,EAAE,GAAG,IAAAO,mBAAW,EAAC1B,gBAAgB,CAAC;IACpC;IAEA,MAAM2B,aAAa,GAAG,IAAAC,sBAAc,EAAC,aAAa,EAAE,IAAI,CAACf,mBAAmB,CAACgB,gBAAgB,CAAC,CAAC,EAAEV,EAAE,CAAC;IAEpG,MAAMW,eAAe,GAAGtB,MAAM,CAACuB,MAAM,CAAC,CAACJ,aAAa,CAACJ,MAAM,CAACL,UAAU,CAAC,EAAES,aAAa,CAACK,KAAK,CAAC,CAAC,CAAC,CAAC;IAEhG,MAAMC,iBAAyB,GAAG,IAAI,CAACC,yBAAyB,CAACf,EAAE,EAAEW,eAAe,EAAE,CAAC,EAAEA,eAAe,CAACK,MAAM,CAAC;IAEhH,OAAO3B,MAAM,CAACuB,MAAM,CAAC,CAACvB,MAAM,CAACC,IAAI,CAAC,CAACV,gBAAgB,CAAC,CAAC,EAAEkC,iBAAiB,EAAEd,EAAE,EAAEW,eAAe,CAAC,CAAC;EACjG;EAEAM,WAAWA,CAACC,UAAkB,EAAU;IACtC,MAAMlB,EAAU,GAAGX,MAAM,CAAC8B,KAAK,CAACtC,gBAAgB,CAAC;IAEjD,MAAMuC,sBAA8B,GAAG,IAAI,CAAC3B,mDAAmD;IAE/F,IAAIyB,UAAU,CAACF,MAAM,GAAGI,sBAAsB,EAAE;MAC9C,MAAM,IAAIC,KAAK,CAAE,+CAA8CH,UAAU,CAACF,MAAO,sCAAqCI,sBAAuB,iCAAgC,CAAC;IAChL;IAEA,IAAIE,UAAU,GAAG,CAAC;IAClB,IAAIJ,UAAU,CAAC,CAAC,CAAC,KAAKtC,gBAAgB,EAAE;MACtC,MAAM,IAAIyC,KAAK,CAAE,2DAA0DhC,MAAM,CAACC,IAAI,CAAC,CAAC4B,UAAU,CAAC,CAAC,CAAC,CAAC,CAAC,CAACK,QAAQ,CAAC,KAAK,CAAE,6DAA4D3C,gBAAiB,GAAE,CAAC;IAC1M;IAEA0C,UAAU,IAAI,CAAC;IACf,IAAIE,uBAAuB,GAAG,CAAC;IAE/BA,uBAAuB,GAAGF,UAAU;IACpCA,UAAU,IAAI,IAAI,CAACpC,cAAc;IAEjCgC,UAAU,CAACO,IAAI,CAACzB,EAAE,EAAE,CAAC,EAAEsB,UAAU,EAAEA,UAAU,GAAGtB,EAAE,CAACgB,MAAM,CAAC;IAC1DM,UAAU,IAAItB,EAAE,CAACgB,MAAM;IAEvB,MAAMU,gBAAgB,GAAGJ,UAAU;IACnC,MAAMK,eAAe,GAAGT,UAAU,CAACF,MAAM,GAAGM,UAAU;IAEtD,MAAMR,iBAAyB,GAAG,IAAI,CAACC,yBAAyB,CAACf,EAAE,EAAEkB,UAAU,EAAEQ,gBAAgB,EAAEC,eAAe,CAAC;IAEnH,IAAI,CAAC,KAAKb,iBAAiB,CAACc,OAAO,CAACV,UAAU,EAAEM,uBAAuB,EAAEK,IAAI,CAACC,GAAG,CAACN,uBAAuB,GAAGG,eAAe,EAAEH,uBAAuB,GAAGV,iBAAiB,CAACE,MAAM,CAAC,EAAE,CAAC,EAAEa,IAAI,CAACC,GAAG,CAACH,eAAe,EAAEb,iBAAiB,CAACE,MAAM,CAAC,CAAC,EAAE;MACzO,MAAM,IAAIK,KAAK,CAAC,yDAAyD,CAAC;IAC5E;IAEA,IAAIU,SAAiB;IAErB,MAAMC,QAAQ,GAAG,IAAAC,wBAAgB,EAAC,aAAa,EAAE,IAAI,CAACvC,mBAAmB,CAACgB,gBAAgB,CAAC,CAAC,EAAEV,EAAE,CAAC;IACjG,IAAI;MACF+B,SAAS,GAAGC,QAAQ,CAAC5B,MAAM,CAACc,UAAU,CAACZ,KAAK,CAACoB,gBAAgB,EAAEA,gBAAgB,GAAGC,eAAe,CAAC,CAAC;MACnGI,SAAS,GAAG1C,MAAM,CAACuB,MAAM,CAAC,CAACmB,SAAS,EAAEC,QAAQ,CAACnB,KAAK,CAAC,CAAC,CAAC,CAAC;IAC1D,CAAC,CAAC,OAAOqB,KAAU,EAAE;MACnB,MAAM,IAAIb,KAAK,CAAE,oCAAmCa,KAAK,CAACC,OAAQ,EAAC,CAAC;IACtE;IAEA,OAAOJ,SAAS;EAClB;EAEAhB,yBAAyBA,CAACf,EAAU,EAAEkB,UAAkB,EAAEkB,MAAc,EAAEpB,MAAc,EAAU;IAChG,MAAMqB,IAAI,GAAG,IAAAnC,kBAAU,EAAC,QAAQ,EAAE,IAAI,CAACR,mBAAmB,CAAC4C,SAAS,CAAC,CAAC,CAAC;IAEvED,IAAI,CAACjC,MAAM,CAAC,IAAI,CAAChB,OAAO,CAAC;IACzBiD,IAAI,CAACjC,MAAM,CAACJ,EAAE,CAAC;IACfqC,IAAI,CAACjC,MAAM,CAACc,UAAU,CAACZ,KAAK,CAAC8B,MAAM,EAAEA,MAAM,GAAGpB,MAAM,CAAC,CAAC;IACtDqB,IAAI,CAACjC,MAAM,CAAC,IAAI,CAACb,WAAW,CAAC;IAC7B,OAAO8C,IAAI,CAAChC,MAAM,CAAC,CAAC;EACtB;AACF;AAAC1B,OAAA,CAAAG,6BAAA,GAAAA,6BAAA"}