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EnvelopedData.js
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import * as asn1js from "asn1js";
import { getParametersValue, utilConcatBuf, clearProps } from "pvutils";
import { getOIDByAlgorithm, getRandomValues, getCrypto, getAlgorithmByOID, kdf } from "./common.js";
import OriginatorInfo from "./OriginatorInfo.js";
import RecipientInfo from "./RecipientInfo.js";
import EncryptedContentInfo from "./EncryptedContentInfo.js";
import Attribute from "./Attribute.js";
import AlgorithmIdentifier from "./AlgorithmIdentifier.js";
import RSAESOAEPParams from "./RSAESOAEPParams.js";
import KeyTransRecipientInfo from "./KeyTransRecipientInfo.js";
import IssuerAndSerialNumber from "./IssuerAndSerialNumber.js";
import RecipientEncryptedKey from "./RecipientEncryptedKey.js";
import KeyAgreeRecipientIdentifier from "./KeyAgreeRecipientIdentifier.js";
import KeyAgreeRecipientInfo from "./KeyAgreeRecipientInfo.js";
import RecipientEncryptedKeys from "./RecipientEncryptedKeys.js";
import KEKRecipientInfo from "./KEKRecipientInfo.js";
import KEKIdentifier from "./KEKIdentifier.js";
import PBKDF2Params from "./PBKDF2Params.js";
import PasswordRecipientinfo from "./PasswordRecipientinfo.js";
import ECCCMSSharedInfo from "./ECCCMSSharedInfo.js";
import OriginatorIdentifierOrKey from "./OriginatorIdentifierOrKey.js";
import OriginatorPublicKey from "./OriginatorPublicKey.js";
//**************************************************************************************
/**
* Class from RFC5652
*/
export default class EnvelopedData
{
//**********************************************************************************
/**
* Constructor for EnvelopedData class
* @param {Object} [parameters={}]
* @param {Object} [parameters.schema] asn1js parsed value to initialize the class from
*/
constructor(parameters = {})
{
//region Internal properties of the object
/**
* @type {number}
* @desc version
*/
this.version = getParametersValue(parameters, "version", EnvelopedData.defaultValues("version"));
if("originatorInfo" in parameters)
/**
* @type {OriginatorInfo}
* @desc originatorInfo
*/
this.originatorInfo = getParametersValue(parameters, "originatorInfo", EnvelopedData.defaultValues("originatorInfo"));
/**
* @type {Array.<RecipientInfo>}
* @desc recipientInfos
*/
this.recipientInfos = getParametersValue(parameters, "recipientInfos", EnvelopedData.defaultValues("recipientInfos"));
/**
* @type {EncryptedContentInfo}
* @desc encryptedContentInfo
*/
this.encryptedContentInfo = getParametersValue(parameters, "encryptedContentInfo", EnvelopedData.defaultValues("encryptedContentInfo"));
if("unprotectedAttrs" in parameters)
/**
* @type {Array.<Attribute>}
* @desc unprotectedAttrs
*/
this.unprotectedAttrs = getParametersValue(parameters, "unprotectedAttrs", EnvelopedData.defaultValues("unprotectedAttrs"));
//endregion
//region If input argument array contains "schema" for this object
if("schema" in parameters)
this.fromSchema(parameters.schema);
//endregion
}
//**********************************************************************************
/**
* Return default values for all class members
* @param {string} memberName String name for a class member
*/
static defaultValues(memberName)
{
switch(memberName)
{
case "version":
return 0;
case "originatorInfo":
return new OriginatorInfo();
case "recipientInfos":
return [];
case "encryptedContentInfo":
return new EncryptedContentInfo();
case "unprotectedAttrs":
return [];
default:
throw new Error(`Invalid member name for EnvelopedData class: ${memberName}`);
}
}
//**********************************************************************************
/**
* Compare values with default values for all class members
* @param {string} memberName String name for a class member
* @param {*} memberValue Value to compare with default value
*/
static compareWithDefault(memberName, memberValue)
{
switch(memberName)
{
case "version":
return (memberValue === EnvelopedData.defaultValues(memberName));
case "originatorInfo":
return ((memberValue.certs.certificates.length === 0) && (memberValue.crls.crls.length === 0));
case "recipientInfos":
case "unprotectedAttrs":
return (memberValue.length === 0);
case "encryptedContentInfo":
return ((EncryptedContentInfo.compareWithDefault("contentType", memberValue.contentType)) &&
(EncryptedContentInfo.compareWithDefault("contentEncryptionAlgorithm", memberValue.contentEncryptionAlgorithm) &&
(EncryptedContentInfo.compareWithDefault("encryptedContent", memberValue.encryptedContent))));
default:
throw new Error(`Invalid member name for EnvelopedData class: ${memberName}`);
}
}
//**********************************************************************************
/**
* Return value of pre-defined ASN.1 schema for current class
*
* ASN.1 schema:
* ```asn1
* EnvelopedData ::= SEQUENCE {
* version CMSVersion,
* originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
* recipientInfos RecipientInfos,
* encryptedContentInfo EncryptedContentInfo,
* unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL }
* ```
*
* @param {Object} parameters Input parameters for the schema
* @returns {Object} asn1js schema object
*/
static schema(parameters = {})
{
/**
* @type {Object}
* @property {string} [blockName]
* @property {string} [version]
* @property {string} [originatorInfo]
* @property {string} [recipientInfos]
* @property {string} [encryptedContentInfo]
* @property {string} [unprotectedAttrs]
*/
const names = getParametersValue(parameters, "names", {});
return (new asn1js.Sequence({
name: (names.blockName || ""),
value: [
new asn1js.Integer({ name: (names.version || "") }),
new asn1js.Constructed({
name: (names.originatorInfo || ""),
optional: true,
idBlock: {
tagClass: 3, // CONTEXT-SPECIFIC
tagNumber: 0 // [0]
},
value: OriginatorInfo.schema().valueBlock.value
}),
new asn1js.Set({
value: [
new asn1js.Repeated({
name: (names.recipientInfos || ""),
value: RecipientInfo.schema()
})
]
}),
EncryptedContentInfo.schema(names.encryptedContentInfo || {}),
new asn1js.Constructed({
optional: true,
idBlock: {
tagClass: 3, // CONTEXT-SPECIFIC
tagNumber: 1 // [1]
},
value: [
new asn1js.Repeated({
name: (names.unprotectedAttrs || ""),
value: Attribute.schema()
})
]
})
]
}));
}
//**********************************************************************************
/**
* Convert parsed asn1js object into current class
* @param {!Object} schema
*/
fromSchema(schema)
{
//region Clear input data first
clearProps(schema, [
"version",
"originatorInfo",
"recipientInfos",
"encryptedContentInfo",
"unprotectedAttrs"
]);
//endregion
//region Check the schema is valid
const asn1 = asn1js.compareSchema(schema,
schema,
EnvelopedData.schema({
names: {
version: "version",
originatorInfo: "originatorInfo",
recipientInfos: "recipientInfos",
encryptedContentInfo: {
names: {
blockName: "encryptedContentInfo"
}
},
unprotectedAttrs: "unprotectedAttrs"
}
})
);
if(asn1.verified === false)
throw new Error("Object's schema was not verified against input data for EnvelopedData");
//endregion
//region Get internal properties from parsed schema
this.version = asn1.result.version.valueBlock.valueDec;
if("originatorInfo" in asn1.result)
{
this.originatorInfo = new OriginatorInfo({
schema: new asn1js.Sequence({
value: asn1.result.originatorInfo.valueBlock.value
})
});
}
this.recipientInfos = Array.from(asn1.result.recipientInfos, element => new RecipientInfo({ schema: element }));
this.encryptedContentInfo = new EncryptedContentInfo({ schema: asn1.result.encryptedContentInfo });
if("unprotectedAttrs" in asn1.result)
this.unprotectedAttrs = Array.from(asn1.result.unprotectedAttrs, element => new Attribute({ schema: element }));
//endregion
}
//**********************************************************************************
/**
* Convert current object to asn1js object and set correct values
* @returns {Object} asn1js object
*/
toSchema()
{
//region Create array for output sequence
const outputArray = [];
outputArray.push(new asn1js.Integer({ value: this.version }));
if("originatorInfo" in this)
{
outputArray.push(new asn1js.Constructed({
optional: true,
idBlock: {
tagClass: 3, // CONTEXT-SPECIFIC
tagNumber: 0 // [0]
},
value: this.originatorInfo.toSchema().valueBlock.value
}));
}
outputArray.push(new asn1js.Set({
value: Array.from(this.recipientInfos, element => element.toSchema())
}));
outputArray.push(this.encryptedContentInfo.toSchema());
if("unprotectedAttrs" in this)
{
outputArray.push(new asn1js.Constructed({
optional: true,
idBlock: {
tagClass: 3, // CONTEXT-SPECIFIC
tagNumber: 1 // [1]
},
value: Array.from(this.unprotectedAttrs, element => element.toSchema())
}));
}
//endregion
//region Construct and return new ASN.1 schema for this object
return (new asn1js.Sequence({
value: outputArray
}));
//endregion
}
//**********************************************************************************
/**
* Convertion for the class to JSON object
* @returns {Object}
*/
toJSON()
{
const _object = {
version: this.version
};
if("originatorInfo" in this)
_object.originatorInfo = this.originatorInfo.toJSON();
_object.recipientInfos = Array.from(this.recipientInfos, element => element.toJSON());
_object.encryptedContentInfo = this.encryptedContentInfo.toJSON();
if("unprotectedAttrs" in this)
_object.unprotectedAttrs = Array.from(this.unprotectedAttrs, element => element.toJSON());
return _object;
}
//**********************************************************************************
/**
* Helpers function for filling "RecipientInfo" based on recipient's certificate.
* Problem with WebCrypto is that for RSA certificates we have only one option - "key transport" and
* for ECC certificates we also have one option - "key agreement". As soon as Google will implement
* DH algorithm it would be possible to use "key agreement" also for RSA certificates.
* @param {Certificate} [certificate] Recipient's certificate
* @param {Object} [parameters] Additional parameters neccessary for "fine tunning" of encryption process
* @param {number} [variant] Variant = 1 is for "key transport", variant = 2 is for "key agreement". In fact the "variant" is unneccessary now because Google has no DH algorithm implementation. Thus key encryption scheme would be choosen by certificate type only: "key transport" for RSA and "key agreement" for ECC certificates.
*/
addRecipientByCertificate(certificate, parameters, variant)
{
//region Initial variables
const encryptionParameters = parameters || {};
//endregion
//region Check type of certificate
if(certificate.subjectPublicKeyInfo.algorithm.algorithmId.indexOf("1.2.840.113549") !== (-1))
variant = 1; // For the moment it is the only variant for RSA-based certificates
else
{
if(certificate.subjectPublicKeyInfo.algorithm.algorithmId.indexOf("1.2.840.10045") !== (-1))
variant = 2; // For the moment it is the only variant for ECC-based certificates
else
throw new Error(`Unknown type of certificate's public key: ${certificate.subjectPublicKeyInfo.algorithm.algorithmId}`);
}
//endregion
//region Initialize encryption parameters
if(("oaepHashAlgorithm" in encryptionParameters) === false)
encryptionParameters.oaepHashAlgorithm = "SHA-512";
if(("kdfAlgorithm" in encryptionParameters) === false)
encryptionParameters.kdfAlgorithm = "SHA-512";
if(("kekEncryptionLength" in encryptionParameters) === false)
encryptionParameters.kekEncryptionLength = 256;
//endregion
//region Add new "recipient" depends on "variant" and certificate type
switch(variant)
{
case 1: // Key transport scheme
{
//region keyEncryptionAlgorithm
const oaepOID = getOIDByAlgorithm({
name: "RSA-OAEP"
});
if(oaepOID === "")
throw new Error("Can not find OID for OAEP");
//endregion
//region RSAES-OAEP-params
const hashOID = getOIDByAlgorithm({
name: encryptionParameters.oaepHashAlgorithm
});
if(hashOID === "")
throw new Error(`Unknown OAEP hash algorithm: ${encryptionParameters.oaepHashAlgorithm}`);
const hashAlgorithm = new AlgorithmIdentifier({
algorithmId: hashOID,
algorithmParams: new asn1js.Null()
});
const rsaOAEPParams = new RSAESOAEPParams({
hashAlgorithm,
maskGenAlgorithm: new AlgorithmIdentifier({
algorithmId: "1.2.840.113549.1.1.8", // id-mgf1
algorithmParams: hashAlgorithm.toSchema()
})
});
//endregion
//region KeyTransRecipientInfo
const keyInfo = new KeyTransRecipientInfo({
version: 0,
rid: new IssuerAndSerialNumber({
issuer: certificate.issuer,
serialNumber: certificate.serialNumber
}),
keyEncryptionAlgorithm: new AlgorithmIdentifier({
algorithmId: oaepOID,
algorithmParams: rsaOAEPParams.toSchema()
}),
recipientCertificate: certificate
// "encryptedKey" will be calculated in "encrypt" function
});
//endregion
//region Final values for "CMS_ENVELOPED_DATA"
this.recipientInfos.push(new RecipientInfo({
variant: 1,
value: keyInfo
}));
//endregion
}
break;
case 2: // Key agreement scheme
{
//region RecipientEncryptedKey
const encryptedKey = new RecipientEncryptedKey({
rid: new KeyAgreeRecipientIdentifier({
variant: 1,
value: new IssuerAndSerialNumber({
issuer: certificate.issuer,
serialNumber: certificate.serialNumber
})
})
// "encryptedKey" will be calculated in "encrypt" function
});
//endregion
//region keyEncryptionAlgorithm
const aesKWoid = getOIDByAlgorithm({
name: "AES-KW",
length: encryptionParameters.kekEncryptionLength
});
if(aesKWoid === "")
throw new Error(`Unknown length for key encryption algorithm: ${encryptionParameters.kekEncryptionLength}`);
const aesKW = new AlgorithmIdentifier({
algorithmId: aesKWoid,
algorithmParams: new asn1js.Null()
});
//endregion
//region KeyAgreeRecipientInfo
const ecdhOID = getOIDByAlgorithm({
name: "ECDH",
kdf: encryptionParameters.kdfAlgorithm
});
if(ecdhOID === "")
throw new Error(`Unknown KDF algorithm: ${encryptionParameters.kdfAlgorithm}`);
// In fact there is no need in so long UKM, but RFC2631
// has requirement that "UserKeyMaterial" must be 512 bits long
const ukmBuffer = new ArrayBuffer(64);
const ukmView = new Uint8Array(ukmBuffer);
getRandomValues(ukmView); // Generate random values in 64 bytes long buffer
const keyInfo = new KeyAgreeRecipientInfo({
version: 3,
// "originator" will be calculated in "encrypt" function because ephemeral key would be generated there
ukm: new asn1js.OctetString({ valueHex: ukmBuffer }),
keyEncryptionAlgorithm: new AlgorithmIdentifier({
algorithmId: ecdhOID,
algorithmParams: aesKW.toSchema()
}),
recipientEncryptedKeys: new RecipientEncryptedKeys({
encryptedKeys: [encryptedKey]
}),
recipientCertificate: certificate
});
//endregion
//region Final values for "CMS_ENVELOPED_DATA"
this.recipientInfos.push(new RecipientInfo({
variant: 2,
value: keyInfo
}));
//endregion
}
break;
default:
throw new Error(`Unknown "variant" value: ${variant}`);
}
//endregion
return true;
}
//**********************************************************************************
/**
* Add recipient based on pre-defined data like password or KEK
* @param {ArrayBuffer} preDefinedData ArrayBuffer with pre-defined data
* @param {Object} parameters Additional parameters neccessary for "fine tunning" of encryption process
* @param {number} variant Variant = 1 for pre-defined "key encryption key" (KEK). Variant = 2 for password-based encryption.
*/
addRecipientByPreDefinedData(preDefinedData, parameters, variant)
{
//region Initial variables
const encryptionParameters = parameters || {};
//endregion
//region Check initial parameters
if((preDefinedData instanceof ArrayBuffer) === false)
throw new Error("Please pass \"preDefinedData\" in ArrayBuffer type");
if(preDefinedData.byteLength === 0)
throw new Error("Pre-defined data could have zero length");
//endregion
//region Initialize encryption parameters
if(("keyIdentifier" in encryptionParameters) === false)
{
const keyIdentifierBuffer = new ArrayBuffer(16);
const keyIdentifierView = new Uint8Array(keyIdentifierBuffer);
getRandomValues(keyIdentifierView);
encryptionParameters.keyIdentifier = keyIdentifierBuffer;
}
if(("hmacHashAlgorithm" in encryptionParameters) === false)
encryptionParameters.hmacHashAlgorithm = "SHA-512";
if(("iterationCount" in encryptionParameters) === false)
encryptionParameters.iterationCount = 2048;
if(("keyEncryptionAlgorithm" in encryptionParameters) === false)
{
encryptionParameters.keyEncryptionAlgorithm = {
name: "AES-KW",
length: 256
};
}
if(("keyEncryptionAlgorithmParams" in encryptionParameters) === false)
encryptionParameters.keyEncryptionAlgorithmParams = new asn1js.Null();
//endregion
//region Add new recipient based on passed variant
switch(variant)
{
case 1: // KEKRecipientInfo
{
//region keyEncryptionAlgorithm
const kekOID = getOIDByAlgorithm(encryptionParameters.keyEncryptionAlgorithm);
if(kekOID === "")
throw new Error("Incorrect value for \"keyEncryptionAlgorithm\"");
//endregion
//region KEKRecipientInfo
const keyInfo = new KEKRecipientInfo({
version: 4,
kekid: new KEKIdentifier({
keyIdentifier: new asn1js.OctetString({ valueHex: encryptionParameters.keyIdentifier })
}),
keyEncryptionAlgorithm: new AlgorithmIdentifier({
algorithmId: kekOID,
/*
For AES-KW params are NULL, but for other algorithm could another situation.
*/
algorithmParams: encryptionParameters.keyEncryptionAlgorithmParams
}),
preDefinedKEK: preDefinedData
// "encryptedKey" would be set in "ecrypt" function
});
//endregion
//region Final values for "CMS_ENVELOPED_DATA"
this.recipientInfos.push(new RecipientInfo({
variant: 3,
value: keyInfo
}));
//endregion
}
break;
case 2: // PasswordRecipientinfo
{
//region keyDerivationAlgorithm
const pbkdf2OID = getOIDByAlgorithm({
name: "PBKDF2"
});
if(pbkdf2OID === "")
throw new Error("Can not find OID for PBKDF2");
//endregion
//region Salt
const saltBuffer = new ArrayBuffer(64);
const saltView = new Uint8Array(saltBuffer);
getRandomValues(saltView);
//endregion
//region HMAC-based algorithm
const hmacOID = getOIDByAlgorithm({
name: "HMAC",
hash: {
name: encryptionParameters.hmacHashAlgorithm
}
});
if(hmacOID === "")
throw new Error(`Incorrect value for "hmacHashAlgorithm": ${encryptionParameters.hmacHashAlgorithm}`);
//endregion
//region PBKDF2-params
const pbkdf2Params = new PBKDF2Params({
salt: new asn1js.OctetString({ valueHex: saltBuffer }),
iterationCount: encryptionParameters.iterationCount,
prf: new AlgorithmIdentifier({
algorithmId: hmacOID,
algorithmParams: new asn1js.Null()
})
});
//endregion
//region keyEncryptionAlgorithm
const kekOID = getOIDByAlgorithm(encryptionParameters.keyEncryptionAlgorithm);
if(kekOID === "")
throw new Error("Incorrect value for \"keyEncryptionAlgorithm\"");
//endregion
//region PasswordRecipientinfo
const keyInfo = new PasswordRecipientinfo({
version: 0,
keyDerivationAlgorithm: new AlgorithmIdentifier({
algorithmId: pbkdf2OID,
algorithmParams: pbkdf2Params.toSchema()
}),
keyEncryptionAlgorithm: new AlgorithmIdentifier({
algorithmId: kekOID,
/*
For AES-KW params are NULL, but for other algorithm could be another situation.
*/
algorithmParams: encryptionParameters.keyEncryptionAlgorithmParams
}),
password: preDefinedData
// "encryptedKey" would be set in "ecrypt" function
});
//endregion
//region Final values for "CMS_ENVELOPED_DATA"
this.recipientInfos.push(new RecipientInfo({
variant: 4,
value: keyInfo
}));
//endregion
}
break;
default:
throw new Error(`Unknown value for "variant": ${variant}`);
}
//endregion
}
//**********************************************************************************
/**
* Create a new CMS Enveloped Data content with encrypted data
* @param {Object} contentEncryptionAlgorithm WebCrypto algorithm. For the moment here could be only "AES-CBC" or "AES-GCM" algorithms.
* @param {ArrayBuffer} contentToEncrypt Content to encrypt
* @returns {Promise}
*/
encrypt(contentEncryptionAlgorithm, contentToEncrypt)
{
//region Initial variables
let sequence = Promise.resolve();
const ivBuffer = new ArrayBuffer(16); // For AES we need IV 16 bytes long
const ivView = new Uint8Array(ivBuffer);
getRandomValues(ivView);
const contentView = new Uint8Array(contentToEncrypt);
let sessionKey;
let encryptedContent;
let exportedSessionKey;
const recipientsPromises = [];
const _this = this;
//endregion
//region Check for input parameters
const contentEncryptionOID = getOIDByAlgorithm(contentEncryptionAlgorithm);
if(contentEncryptionOID === "")
return Promise.reject("Wrong \"contentEncryptionAlgorithm\" value");
//endregion
//region Get a "crypto" extension
const crypto = getCrypto();
if(typeof crypto === "undefined")
return Promise.reject("Unable to create WebCrypto object");
//endregion
//region Generate new content encryption key
sequence = sequence.then(() =>
crypto.generateKey(contentEncryptionAlgorithm, true, ["encrypt"]));
//endregion
//region Encrypt content
sequence = sequence.then(result =>
{
sessionKey = result;
return crypto.encrypt({
name: contentEncryptionAlgorithm.name,
iv: ivView
},
sessionKey,
contentView);
}, error =>
Promise.reject(error));
//endregion
//region Export raw content of content encryption key
sequence = sequence.then(result =>
{
//region Create output OCTETSTRING with encrypted content
encryptedContent = result;
//endregion
return crypto.exportKey("raw", sessionKey);
}, error =>
Promise.reject(error)
).then(result =>
{
exportedSessionKey = result;
return true;
}, error =>
Promise.reject(error));
//endregion
//region Append common information to CMS_ENVELOPED_DATA
sequence = sequence.then(() =>
{
this.version = 2;
this.encryptedContentInfo = new EncryptedContentInfo({
contentType: "1.2.840.113549.1.7.1", // "data"
contentEncryptionAlgorithm: new AlgorithmIdentifier({
algorithmId: contentEncryptionOID,
algorithmParams: new asn1js.OctetString({ valueHex: ivBuffer })
}),
encryptedContent: new asn1js.OctetString({ valueHex: encryptedContent })
});
}, error =>
Promise.reject(error));
//endregion
//region Special sub-functions to work with each recipient's type
function SubKeyAgreeRecipientInfo(index)
{
//region Initial variables
let currentSequence = Promise.resolve();
let ecdhPublicKey;
let ecdhPrivateKey;
let recipientCurve;
let recipientCurveLength;
let exportedECDHPublicKey;
//endregion
//region Get "namedCurve" parameter from recipient's certificate
currentSequence = currentSequence.then(() =>
{
const curveObject = _this.recipientInfos[index].value.recipientCertificate.subjectPublicKeyInfo.algorithm.algorithmParams;
if((curveObject instanceof asn1js.ObjectIdentifier) === false)
return Promise.reject(`Incorrect "recipientCertificate" for index ${index}`);
const curveOID = curveObject.valueBlock.toString();
switch(curveOID)
{
case "1.2.840.10045.3.1.7":
recipientCurve = "P-256";
recipientCurveLength = 256;
break;
case "1.3.132.0.34":
recipientCurve = "P-384";
recipientCurveLength = 384;
break;
case "1.3.132.0.35":
recipientCurve = "P-521";
recipientCurveLength = 528;
break;
default:
return Promise.reject(`Incorrect curve OID for index ${index}`);
}
return recipientCurve;
}, error =>
Promise.reject(error));
//endregion
//region Generate ephemeral ECDH key
currentSequence = currentSequence.then(result =>
crypto.generateKey({
name: "ECDH",
namedCurve: result
},
true,
["deriveBits"]),
error =>
Promise.reject(error)
);
//endregion
//region Export public key of ephemeral ECDH key pair
currentSequence = currentSequence.then(result =>
{
ecdhPublicKey = result.publicKey;
ecdhPrivateKey = result.privateKey;
return crypto.exportKey("spki", ecdhPublicKey);
},
error =>
Promise.reject(error));
//endregion
//region Import recipient's public key
currentSequence = currentSequence.then(result =>
{
exportedECDHPublicKey = result;
return _this.recipientInfos[index].value.recipientCertificate.getPublicKey({
algorithm: {
algorithm: {
name: "ECDH",
namedCurve: recipientCurve
},
usages: []
}
});
}, error =>
Promise.reject(error));
//endregion
//region Create shared secret
currentSequence = currentSequence.then(result => crypto.deriveBits({
name: "ECDH",
public: result
},
ecdhPrivateKey,
recipientCurveLength),
error =>
Promise.reject(error));
//endregion
//region Apply KDF function to shared secret
currentSequence = currentSequence.then(
/**
* @param {ArrayBuffer} result
*/
result =>
{
//region Get length of used AES-KW algorithm
const aesKWAlgorithm = new AlgorithmIdentifier({ schema: _this.recipientInfos[index].value.keyEncryptionAlgorithm.algorithmParams });
const KWalgorithm = getAlgorithmByOID(aesKWAlgorithm.algorithmId);
if(("name" in KWalgorithm) === false)
return Promise.reject(`Incorrect OID for key encryption algorithm: ${aesKWAlgorithm.algorithmId}`);
//endregion
//region Translate AES-KW length to ArrayBuffer
let kwLength = KWalgorithm.length;
const kwLengthBuffer = new ArrayBuffer(4);
const kwLengthView = new Uint8Array(kwLengthBuffer);
for(let j = 3; j >= 0; j--)
{
kwLengthView[j] = kwLength;
kwLength >>= 8;
}
//endregion
//region Create and encode "ECC-CMS-SharedInfo" structure
const eccInfo = new ECCCMSSharedInfo({
keyInfo: new AlgorithmIdentifier({
algorithmId: aesKWAlgorithm.algorithmId,
/*
Initially RFC5753 says that AES algorithms have absent parameters.
But since early implementations all put NULL here. Thus, in order to be
"backward compatible", index also put NULL here.
*/
algorithmParams: new asn1js.Null()
}),
entityUInfo: _this.recipientInfos[index].value.ukm,
suppPubInfo: new asn1js.OctetString({ valueHex: kwLengthBuffer })
});
const encodedInfo = eccInfo.toSchema().toBER(false);
//endregion
//region Get SHA algorithm used together with ECDH
const ecdhAlgorithm = getAlgorithmByOID(_this.recipientInfos[index].value.keyEncryptionAlgorithm.algorithmId);
if(("name" in ecdhAlgorithm) === false)
return Promise.reject(`Incorrect OID for key encryption algorithm: ${_this.recipientInfos[index].value.keyEncryptionAlgorithm.algorithmId}`);
//endregion
return kdf(ecdhAlgorithm.kdf, result, KWalgorithm.length, encodedInfo);
},
error =>
Promise.reject(error));
//endregion
//region Import AES-KW key from result of KDF function
currentSequence = currentSequence.then(result =>
crypto.importKey("raw", result, { name: "AES-KW" }, true, ["wrapKey"]),
error =>
Promise.reject(error)
);
//endregion
//region Finally wrap session key by using AES-KW algorithm
currentSequence = currentSequence.then(result => crypto.wrapKey("raw", sessionKey, result, { name: "AES-KW" }),
error =>
Promise.reject(error)
);
//endregion
//region Append all neccessary data to current CMS_RECIPIENT_INFO object
currentSequence = currentSequence.then(result =>
{
//region OriginatorIdentifierOrKey
const asn1 = asn1js.fromBER(exportedECDHPublicKey);
const originator = new OriginatorIdentifierOrKey();
originator.variant = 3;
originator.value = new OriginatorPublicKey({ schema: asn1.result });
// There is option when we can stay with ECParameters, but here index prefer to avoid the params
if("algorithmParams" in originator.value.algorithm)
delete originator.value.algorithm.algorithmParams;
_this.recipientInfos[index].value.originator = originator;
//endregion
//region RecipientEncryptedKey
/*
We will not support using of same ephemeral key for many recipients
*/
_this.recipientInfos[index].value.recipientEncryptedKeys.encryptedKeys[0].encryptedKey = new asn1js.OctetString({ valueHex: result });
//endregion
}, error =>
Promise.reject(error)
);
//endregion
return currentSequence;
}
function SubKeyTransRecipientInfo(index)
{
//region Initial variables
let currentSequence = Promise.resolve();
//endregion
//region Get recipient's public key
currentSequence = currentSequence.then(() =>
{
//region Check we have a correct algorithm here
const oaepOID = getOIDByAlgorithm({
name: "RSA-OAEP"
});
if(oaepOID === "")
throw new Error("Can not find OID for OAEP");
if(_this.recipientInfos[index].value.keyEncryptionAlgorithm.algorithmId !== oaepOID)
throw new Error("Not supported encryption scheme, only RSA-OAEP is supported for key transport encryption scheme");
//endregion
//region Get current used SHA algorithm
const schema = _this.recipientInfos[index].value.keyEncryptionAlgorithm.algorithmParams;
const rsaOAEPParams = new RSAESOAEPParams({ schema });
const hashAlgorithm = getAlgorithmByOID(rsaOAEPParams.hashAlgorithm.algorithmId);
if(("name" in hashAlgorithm) === false)
return Promise.reject(`Incorrect OID for hash algorithm: ${rsaOAEPParams.hashAlgorithm.algorithmId}`);
//endregion
return _this.recipientInfos[index].value.recipientCertificate.getPublicKey({
algorithm: {
algorithm: {
name: "RSA-OAEP",
hash: {
name: hashAlgorithm.name
}
},
usages: ["encrypt", "wrapKey"]
}
});
}, error =>
Promise.reject(error));
//endregion
//region Encrypt early exported session key on recipient's public key
currentSequence = currentSequence.then(result =>
crypto.encrypt(result.algorithm, result, exportedSessionKey),
error =>
Promise.reject(error)
);
//endregion
//region Append all neccessary data to current CMS_RECIPIENT_INFO object
currentSequence = currentSequence.then(result =>
{
//region RecipientEncryptedKey
_this.recipientInfos[index].value.encryptedKey = new asn1js.OctetString({ valueHex: result });
//endregion
}, error =>