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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | 26x 26x 26x 8x 8x 4x 4x 20x 20x 12x 8x 12x 4x 8x 8x 8x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x | export function certToPEM(cert) {
cert = cert.match(/.{1,64}/g).join('\n');
cert = `-----BEGIN CERTIFICATE-----\n${cert}\n-----END CERTIFICATE-----\n`;
return cert;
};
function prepadSigned(hexStr) {
const msb = hexStr[0];
if (msb < '0' || msb > '7') {
return `00${hexStr}`;
}
return hexStr;
}
function toHex(number) {
const nstr = number.toString(16);
if (nstr.length % 2) {
return `0${nstr}`;
}
return nstr;
}
function encodeLengthHex(n) {
if (n <= 127) {
return toHex(n);
}
const nHex = toHex(n);
const lengthOfLengthByte = 128 + nHex.length / 2;
return toHex(lengthOfLengthByte) + nHex;
}
/*
* Source: http://stackoverflow.com/questions/18835132/xml-to-pem-in-node-js
*/
export function rsaPublicKeyToPEM(modulusB64, exponentB64) {
const modulus = new Buffer(modulusB64, 'base64');
const exponent = new Buffer(exponentB64, 'base64');
const modulusHex = prepadSigned(modulus.toString('hex'));
const exponentHex = prepadSigned(exponent.toString('hex'));
const modlen = modulusHex.length / 2;
const explen = exponentHex.length / 2;
const encodedModlen = encodeLengthHex(modlen);
const encodedExplen = encodeLengthHex(explen);
const encodedPubkey = '30' +
encodeLengthHex(modlen + explen + encodedModlen.length / 2 + encodedExplen.length / 2 + 2) +
'02' + encodedModlen + modulusHex +
'02' + encodedExplen + exponentHex;
const der = new Buffer(encodedPubkey, 'hex')
.toString('base64');
let pem = `-----BEGIN RSA PUBLIC KEY-----\n`;
pem += `${der.match(/.{1,64}/g).join('\n')}`;
pem += `\n-----END RSA PUBLIC KEY-----\n`;
return pem;
};
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