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const {
ObjectSetPrototypeOf,
ReflectApply,
StringPrototypeToLowerCase,
} = primordials;
const {
CipherBase,
privateDecrypt: _privateDecrypt,
privateEncrypt: _privateEncrypt,
publicDecrypt: _publicDecrypt,
publicEncrypt: _publicEncrypt,
getCipherInfo: _getCipherInfo,
} = internalBinding('crypto');
const {
crypto: {
RSA_PKCS1_OAEP_PADDING,
RSA_PKCS1_PADDING,
}
} = internalBinding('constants');
const {
codes: {
ERR_CRYPTO_INVALID_STATE,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
}
} = require('internal/errors');
const {
validateEncoding,
validateInt32,
validateObject,
validateString,
} = require('internal/validators');
const {
preparePrivateKey,
preparePublicOrPrivateKey,
prepareSecretKey,
} = require('internal/crypto/keys');
const {
getDefaultEncoding,
getArrayBufferOrView,
getStringOption,
kHandle,
} = require('internal/crypto/util');
const {
isArrayBufferView,
} = require('internal/util/types');
const assert = require('internal/assert');
const LazyTransform = require('internal/streams/lazy_transform');
const { normalizeEncoding } = require('internal/util');
const { StringDecoder } = require('string_decoder');
function rsaFunctionFor(method, defaultPadding, keyType) {
return (options, buffer) => {
const { format, type, data, passphrase } =
keyType === 'private' ?
preparePrivateKey(options) :
preparePublicOrPrivateKey(options);
const padding = options.padding || defaultPadding;
const { oaepHash, encoding } = options;
let { oaepLabel } = options;
if (oaepHash !== undefined)
validateString(oaepHash, 'key.oaepHash');
if (oaepLabel !== undefined)
oaepLabel = getArrayBufferOrView(oaepLabel, 'key.oaepLabel', encoding);
buffer = getArrayBufferOrView(buffer, 'buffer', encoding);
return method(data, format, type, passphrase, buffer, padding, oaepHash,
oaepLabel);
};
}
const publicEncrypt = rsaFunctionFor(_publicEncrypt, RSA_PKCS1_OAEP_PADDING,
'public');
const publicDecrypt = rsaFunctionFor(_publicDecrypt, RSA_PKCS1_PADDING,
'public');
const privateEncrypt = rsaFunctionFor(_privateEncrypt, RSA_PKCS1_PADDING,
'private');
const privateDecrypt = rsaFunctionFor(_privateDecrypt, RSA_PKCS1_OAEP_PADDING,
'private');
function getDecoder(decoder, encoding) {
encoding = normalizeEncoding(encoding);
decoder = decoder || new StringDecoder(encoding);
assert(decoder.encoding === encoding, 'Cannot change encoding');
return decoder;
}
function getUIntOption(options, key) {
let value;
if (options && (value = options[key]) != null) {
if (value >>> 0 !== value)
throw new ERR_INVALID_ARG_VALUE(`options.${key}`, value);
return value;
}
return -1;
}
function createCipherBase(cipher, credential, options, decipher, iv) {
const authTagLength = getUIntOption(options, 'authTagLength');
this[kHandle] = new CipherBase(decipher);
if (iv === undefined) {
this[kHandle].init(cipher, credential, authTagLength);
} else {
this[kHandle].initiv(cipher, credential, iv, authTagLength);
}
this._decoder = null;
ReflectApply(LazyTransform, this, [options]);
}
function createCipher(cipher, password, options, decipher) {
validateString(cipher, 'cipher');
password = getArrayBufferOrView(password, 'password');
ReflectApply(createCipherBase, this, [cipher, password, options, decipher]);
}
function createCipherWithIV(cipher, key, options, decipher, iv) {
validateString(cipher, 'cipher');
const encoding = getStringOption(options, 'encoding');
key = prepareSecretKey(key, encoding);
iv = iv === null ? null : getArrayBufferOrView(iv, 'iv');
ReflectApply(createCipherBase, this, [cipher, key, options, decipher, iv]);
}
// The Cipher class is part of the legacy Node.js crypto API. It exposes
// a stream-based encryption/decryption model. For backwards compatibility
// the Cipher class is defined using the legacy function syntax rather than
// ES6 classes.
function Cipher(cipher, password, options) {
if (!(this instanceof Cipher))
return new Cipher(cipher, password, options);
ReflectApply(createCipher, this, [cipher, password, options, true]);
}
ObjectSetPrototypeOf(Cipher.prototype, LazyTransform.prototype);
ObjectSetPrototypeOf(Cipher, LazyTransform);
Cipher.prototype._transform = function _transform(chunk, encoding, callback) {
this.push(this[kHandle].update(chunk, encoding));
callback();
};
Cipher.prototype._flush = function _flush(callback) {
try {
this.push(this[kHandle].final());
} catch (e) {
callback(e);
return;
}
callback();
};
Cipher.prototype.update = function update(data, inputEncoding, outputEncoding) {
const encoding = getDefaultEncoding();
inputEncoding = inputEncoding || encoding;
outputEncoding = outputEncoding || encoding;
if (typeof data === 'string') {
validateEncoding(data, inputEncoding);
} else if (!isArrayBufferView(data)) {
throw new ERR_INVALID_ARG_TYPE(
'data', ['string', 'Buffer', 'TypedArray', 'DataView'], data);
}
const ret = this[kHandle].update(data, inputEncoding);
if (outputEncoding && outputEncoding !== 'buffer') {
this._decoder = getDecoder(this._decoder, outputEncoding);
return this._decoder.write(ret);
}
return ret;
};
Cipher.prototype.final = function final(outputEncoding) {
outputEncoding = outputEncoding || getDefaultEncoding();
const ret = this[kHandle].final();
if (outputEncoding && outputEncoding !== 'buffer') {
this._decoder = getDecoder(this._decoder, outputEncoding);
return this._decoder.end(ret);
}
return ret;
};
Cipher.prototype.setAutoPadding = function setAutoPadding(ap) {
if (!this[kHandle].setAutoPadding(!!ap))
throw new ERR_CRYPTO_INVALID_STATE('setAutoPadding');
return this;
};
Cipher.prototype.getAuthTag = function getAuthTag() {
const ret = this[kHandle].getAuthTag();
if (ret === undefined)
throw new ERR_CRYPTO_INVALID_STATE('getAuthTag');
return ret;
};
function setAuthTag(tagbuf, encoding) {
tagbuf = getArrayBufferOrView(tagbuf, 'buffer', encoding);
if (!this[kHandle].setAuthTag(tagbuf))
throw new ERR_CRYPTO_INVALID_STATE('setAuthTag');
return this;
}
Cipher.prototype.setAAD = function setAAD(aadbuf, options) {
const encoding = getStringOption(options, 'encoding');
const plaintextLength = getUIntOption(options, 'plaintextLength');
aadbuf = getArrayBufferOrView(aadbuf, 'aadbuf', encoding);
if (!this[kHandle].setAAD(aadbuf, plaintextLength))
throw new ERR_CRYPTO_INVALID_STATE('setAAD');
return this;
};
// The Cipheriv class is part of the legacy Node.js crypto API. It exposes
// a stream-based encryption/decryption model. For backwards compatibility
// the Cipheriv class is defined using the legacy function syntax rather than
// ES6 classes.
function Cipheriv(cipher, key, iv, options) {
if (!(this instanceof Cipheriv))
return new Cipheriv(cipher, key, iv, options);
ReflectApply(createCipherWithIV, this, [cipher, key, options, true, iv]);
}
function addCipherPrototypeFunctions(constructor) {
constructor.prototype._transform = Cipher.prototype._transform;
constructor.prototype._flush = Cipher.prototype._flush;
constructor.prototype.update = Cipher.prototype.update;
constructor.prototype.final = Cipher.prototype.final;
constructor.prototype.setAutoPadding = Cipher.prototype.setAutoPadding;
if (constructor === Cipheriv) {
constructor.prototype.getAuthTag = Cipher.prototype.getAuthTag;
} else {
constructor.prototype.setAuthTag = setAuthTag;
}
constructor.prototype.setAAD = Cipher.prototype.setAAD;
}
ObjectSetPrototypeOf(Cipheriv.prototype, LazyTransform.prototype);
ObjectSetPrototypeOf(Cipheriv, LazyTransform);
addCipherPrototypeFunctions(Cipheriv);
// The Decipher class is part of the legacy Node.js crypto API. It exposes
// a stream-based encryption/decryption model. For backwards compatibility
// the Decipher class is defined using the legacy function syntax rather than
// ES6 classes.
function Decipher(cipher, password, options) {
if (!(this instanceof Decipher))
return new Decipher(cipher, password, options);
ReflectApply(createCipher, this, [cipher, password, options, false]);
}
ObjectSetPrototypeOf(Decipher.prototype, LazyTransform.prototype);
ObjectSetPrototypeOf(Decipher, LazyTransform);
addCipherPrototypeFunctions(Decipher);
// The Decipheriv class is part of the legacy Node.js crypto API. It exposes
// a stream-based encryption/decryption model. For backwards compatibility
// the Decipheriv class is defined using the legacy function syntax rather than
// ES6 classes.
function Decipheriv(cipher, key, iv, options) {
if (!(this instanceof Decipheriv))
return new Decipheriv(cipher, key, iv, options);
ReflectApply(createCipherWithIV, this, [cipher, key, options, false, iv]);
}
ObjectSetPrototypeOf(Decipheriv.prototype, LazyTransform.prototype);
ObjectSetPrototypeOf(Decipheriv, LazyTransform);
addCipherPrototypeFunctions(Decipheriv);
function getCipherInfo(nameOrNid, options) {
if (typeof nameOrNid !== 'string' && typeof nameOrNid !== 'number') {
throw new ERR_INVALID_ARG_TYPE(
'nameOrNid',
['string', 'number'],
nameOrNid);
}
if (typeof nameOrNid === 'number')
validateInt32(nameOrNid, 'nameOrNid');
let keyLength, ivLength;
if (options !== undefined) {
validateObject(options, 'options');
({ keyLength, ivLength } = options);
if (keyLength !== undefined)
validateInt32(keyLength, 'options.keyLength');
if (ivLength !== undefined)
validateInt32(ivLength, 'options.ivLength');
}
const ret = _getCipherInfo({}, nameOrNid, keyLength, ivLength);
if (ret !== undefined) {
if (ret.name) ret.name = StringPrototypeToLowerCase(ret.name);
if (ret.type) ret.type = StringPrototypeToLowerCase(ret.type);
}
return ret;
}
module.exports = {
Cipher,
Cipheriv,
Decipher,
Decipheriv,
privateDecrypt,
privateEncrypt,
publicDecrypt,
publicEncrypt,
getCipherInfo,
};
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