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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// Copyright 2017 crypto-browserify. All rights reserved. MIT license.
// deno-lint-ignore-file no-var
import { Buffer } from "internal:deno_node/polyfills/buffer.ts";
import { Transform } from "internal:deno_node/polyfills/stream.ts";
import { StringDecoder } from "internal:deno_node/polyfills/string_decoder.ts";
export function CipherBase(hashMode) {
Transform.call(this);
this.hashMode = typeof hashMode === "string";
if (this.hashMode) {
this[hashMode] = this._finalOrDigest;
} else {
this.final = this._finalOrDigest;
}
if (this._final) {
this.__final = this._final;
this._final = null;
}
this._decoder = null;
this._encoding = null;
}
// inherits(CipherBase, Transform)
CipherBase.prototype = Object.create(Transform.prototype, {
constructor: {
value: CipherBase,
enumerable: false,
writable: true,
configurable: true,
},
});
CipherBase.prototype.update = function (data, inputEnc, outputEnc) {
if (typeof data === "string") {
data = Buffer.from(data, inputEnc);
}
var outData = this._update(data);
if (this.hashMode) return this;
if (outputEnc) {
outData = this._toString(outData, outputEnc);
}
return outData;
};
CipherBase.prototype.setAutoPadding = function () {};
CipherBase.prototype.getAuthTag = function () {
throw new Error("trying to get auth tag in unsupported state");
};
CipherBase.prototype.setAuthTag = function () {
throw new Error("trying to set auth tag in unsupported state");
};
CipherBase.prototype.setAAD = function () {
throw new Error("trying to set aad in unsupported state");
};
CipherBase.prototype._transform = function (data, _, next) {
var err;
try {
if (this.hashMode) {
this._update(data);
} else {
this.push(this._update(data));
}
} catch (e) {
err = e;
} finally {
next(err);
}
};
CipherBase.prototype._flush = function (done) {
var err;
try {
this.push(this.__final());
} catch (e) {
err = e;
}
done(err);
};
CipherBase.prototype._finalOrDigest = function (outputEnc) {
var outData = this.__final() || Buffer.alloc(0);
if (outputEnc) {
outData = this._toString(outData, outputEnc, true);
}
return outData;
};
CipherBase.prototype._toString = function (value, enc, fin) {
if (!this._decoder) {
this._decoder = new StringDecoder(enc);
this._encoding = enc;
}
if (this._encoding !== enc) throw new Error("can't switch encodings");
var out = this._decoder.write(value);
if (fin) {
out += this._decoder.end();
}
return out;
};
export default CipherBase;
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