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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// Copyright 2017 Fedor Indutny. All rights reserved. MIT license.
import { Buffer } from "internal:deno_node/polyfills/buffer.ts";
import { DERDecoder } from "internal:deno_node/polyfills/_crypto/crypto_browserify/asn1.js/decoders/der.js";
export function PEMDecoder(entity) {
DERDecoder.call(this, entity);
this.enc = "pem";
}
// inherits(PEMDecoder, DERDecoder);
PEMDecoder.prototype = Object.create(DERDecoder.prototype, {
constructor: {
value: PEMDecoder,
enumerable: false,
writable: true,
configurable: true,
},
});
PEMDecoder.prototype.decode = function decode(data, options) {
const lines = data.toString().split(/[\r\n]+/g);
const label = options.label.toUpperCase();
const re = /^-----(BEGIN|END) ([^-]+)-----$/;
let start = -1;
let end = -1;
for (let i = 0; i < lines.length; i++) {
const match = lines[i].match(re);
if (match === null) {
continue;
}
if (match[2] !== label) {
continue;
}
if (start === -1) {
if (match[1] !== "BEGIN") {
break;
}
start = i;
} else {
if (match[1] !== "END") {
break;
}
end = i;
break;
}
}
if (start === -1 || end === -1) {
throw new Error("PEM section not found for: " + label);
}
const base64 = lines.slice(start + 1, end).join("");
// Remove excessive symbols
base64.replace(/[^a-z0-9+/=]+/gi, "");
const input = Buffer.from(base64, "base64");
return DERDecoder.prototype.decode.call(this, input, options);
};
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