tedious/lib/always-encrypted/aead-aes-256-cbc-hmac-algorithm.js

A TDS driver, for connecting to MS SQLServer databases.

"use strict";

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 = 'AEAD_AES_256_CBC_HMAC_SHA256';
exports.algorithmName = algorithmName;
const algorithmVersion = 0x1;
const blockSizeInBytes = 16;

class AeadAes256CbcHmac256Algorithm {
  constructor(columnEncryptionKey, encryptionType) {
    this.columnEncryptionkey = void 0;
    this.isDeterministic = void 0;
    this.keySizeInBytes = void 0;
    this.version = void 0;
    this.versionSize = void 0;
    this.minimumCipherTextLengthInBytesNoAuthenticationTag = void 0;
    this.minimumCipherTextLengthInBytesWithAuthenticationTag = void 0;
    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;;AACA;;AACA;;AALA;AACA;AAMO,MAAMA,aAAa,GAAG,8BAAtB;;AACP,MAAMC,gBAAgB,GAAG,GAAzB;AACA,MAAMC,gBAAgB,GAAG,EAAzB;;AAEO,MAAMC,6BAAN,CAAmE;EASxEC,WAAW,CAACC,mBAAD,EAAyDC,cAAzD,EAAkG;IAAA,KARrGC,mBAQqG;IAAA,KAPrGC,eAOqG;IAAA,KANrGC,cAMqG;IAAA,KALrGC,OAKqG;IAAA,KAJrGC,WAIqG;IAAA,KAHrGC,iDAGqG;IAAA,KAFrGC,mDAEqG;IAC3G,KAAKJ,cAAL,GAAsBK,0CAAU,CAAhC;IACA,KAAKJ,OAAL,GAAeK,MAAM,CAACC,IAAP,CAAY,CAACf,gBAAD,CAAZ,CAAf;IACA,KAAKU,WAAL,GAAmBI,MAAM,CAACC,IAAP,CAAY,CAAC,CAAD,CAAZ,CAAnB;IACA,KAAKJ,iDAAL,GAAyD,IAAIV,gBAAJ,GAAuBA,gBAAhF;IACA,KAAKW,mDAAL,GAA2D,KAAKD,iDAAL,GAAyD,KAAKH,cAAzH;IACA,KAAKF,mBAAL,GAA2BF,mBAA3B;IAEA,KAAKG,eAAL,GAAuBF,cAAc,KAAKW,+BAAwBC,aAAlE;EACD;;EAEDC,WAAW,CAACC,UAAD,EAA6B;IACtC,IAAIC,EAAJ;;IAEA,IAAI,KAAKb,eAAL,KAAyB,IAA7B,EAAmC;MACjC,MAAMc,MAAM,GAAG,wBAAW,QAAX,EAAqB,KAAKf,mBAAL,CAAyBgB,QAAzB,EAArB,CAAf;MACAD,MAAM,CAACE,MAAP,CAAcJ,UAAd;MACAC,EAAE,GAAGC,MAAM,CAACG,MAAP,GAAgBC,KAAhB,CAAsB,CAAtB,EAAyBxB,gBAAzB,CAAL;IACD,CAJD,MAIO;MACLmB,EAAE,GAAG,yBAAYnB,gBAAZ,CAAL;IACD;;IAED,MAAMyB,aAAa,GAAG,4BAAe,aAAf,EAA8B,KAAKpB,mBAAL,CAAyBqB,gBAAzB,EAA9B,EAA2EP,EAA3E,CAAtB;IAEA,MAAMQ,eAAe,GAAGd,MAAM,CAACe,MAAP,CAAc,CAACH,aAAa,CAACH,MAAd,CAAqBJ,UAArB,CAAD,EAAmCO,aAAa,CAACI,KAAd,EAAnC,CAAd,CAAxB;;IAEA,MAAMC,iBAAyB,GAAG,KAAKC,yBAAL,CAA+BZ,EAA/B,EAAmCQ,eAAnC,EAAoD,CAApD,EAAuDA,eAAe,CAACK,MAAvE,CAAlC;;IAEA,OAAOnB,MAAM,CAACe,MAAP,CAAc,CAACf,MAAM,CAACC,IAAP,CAAY,CAACf,gBAAD,CAAZ,CAAD,EAAkC+B,iBAAlC,EAAqDX,EAArD,EAAyDQ,eAAzD,CAAd,CAAP;EACD;;EAEDM,WAAW,CAACC,UAAD,EAA6B;IACtC,MAAMf,EAAU,GAAGN,MAAM,CAACsB,KAAP,CAAanC,gBAAb,CAAnB;IAEA,MAAMoC,sBAA8B,GAAG,KAAKzB,mDAA5C;;IAEA,IAAIuB,UAAU,CAACF,MAAX,GAAoBI,sBAAxB,EAAgD;MAC9C,MAAM,IAAIC,KAAJ,CAAW,+CAA8CH,UAAU,CAACF,MAAO,sCAAqCI,sBAAuB,iCAAvI,CAAN;IACD;;IAED,IAAIE,UAAU,GAAG,CAAjB;;IACA,IAAIJ,UAAU,CAAC,CAAD,CAAV,KAAkBnC,gBAAtB,EAAwC;MACtC,MAAM,IAAIsC,KAAJ,CAAW,2DAA0DxB,MAAM,CAACC,IAAP,CAAY,CAACoB,UAAU,CAAC,CAAD,CAAX,CAAZ,EAA6BK,QAA7B,CAAsC,KAAtC,CAA6C,6DAA4DxC,gBAAiB,GAA/L,CAAN;IACD;;IAEDuC,UAAU,IAAI,CAAd;IACA,IAAIE,uBAAuB,GAAG,CAA9B;IAEAA,uBAAuB,GAAGF,UAA1B;IACAA,UAAU,IAAI,KAAK/B,cAAnB;IAEA2B,UAAU,CAACO,IAAX,CAAgBtB,EAAhB,EAAoB,CAApB,EAAuBmB,UAAvB,EAAmCA,UAAU,GAAGnB,EAAE,CAACa,MAAnD;IACAM,UAAU,IAAInB,EAAE,CAACa,MAAjB;IAEA,MAAMU,gBAAgB,GAAGJ,UAAzB;IACA,MAAMK,eAAe,GAAGT,UAAU,CAACF,MAAX,GAAoBM,UAA5C;;IAEA,MAAMR,iBAAyB,GAAG,KAAKC,yBAAL,CAA+BZ,EAA/B,EAAmCe,UAAnC,EAA+CQ,gBAA/C,EAAiEC,eAAjE,CAAlC;;IAEA,IAAI,MAAMb,iBAAiB,CAACc,OAAlB,CAA0BV,UAA1B,EAAsCM,uBAAtC,EAA+DK,IAAI,CAACC,GAAL,CAASN,uBAAuB,GAAGG,eAAnC,EAAoDH,uBAAuB,GAAGV,iBAAiB,CAACE,MAAhG,CAA/D,EAAwK,CAAxK,EAA2Ka,IAAI,CAACC,GAAL,CAASH,eAAT,EAA0Bb,iBAAiB,CAACE,MAA5C,CAA3K,CAAV,EAA2O;MACzO,MAAM,IAAIK,KAAJ,CAAU,yDAAV,CAAN;IACD;;IAED,IAAIU,SAAJ;IAEA,MAAMC,QAAQ,GAAG,8BAAiB,aAAjB,EAAgC,KAAK3C,mBAAL,CAAyBqB,gBAAzB,EAAhC,EAA6EP,EAA7E,CAAjB;;IACA,IAAI;MACF4B,SAAS,GAAGC,QAAQ,CAAC1B,MAAT,CAAgBY,UAAU,CAACV,KAAX,CAAiBkB,gBAAjB,EAAmCA,gBAAgB,GAAGC,eAAtD,CAAhB,CAAZ;MACAI,SAAS,GAAGlC,MAAM,CAACe,MAAP,CAAc,CAACmB,SAAD,EAAYC,QAAQ,CAACnB,KAAT,EAAZ,CAAd,CAAZ;IACD,CAHD,CAGE,OAAOoB,KAAP,EAAmB;MACnB,MAAM,IAAIZ,KAAJ,CAAW,oCAAmCY,KAAK,CAACC,OAAQ,EAA5D,CAAN;IACD;;IAED,OAAOH,SAAP;EACD;;EAEDhB,yBAAyB,CAACZ,EAAD,EAAae,UAAb,EAAiCiB,MAAjC,EAAiDnB,MAAjD,EAAyE;IAChG,MAAMoB,IAAI,GAAG,wBAAW,QAAX,EAAqB,KAAK/C,mBAAL,CAAyBgD,SAAzB,EAArB,CAAb;IAEAD,IAAI,CAAC9B,MAAL,CAAY,KAAKd,OAAjB;IACA4C,IAAI,CAAC9B,MAAL,CAAYH,EAAZ;IACAiC,IAAI,CAAC9B,MAAL,CAAYY,UAAU,CAACV,KAAX,CAAiB2B,MAAjB,EAAyBA,MAAM,GAAGnB,MAAlC,CAAZ;IACAoB,IAAI,CAAC9B,MAAL,CAAY,KAAKb,WAAjB;IACA,OAAO2C,IAAI,CAAC7B,MAAL,EAAP;EACD;;AA7FuE"}