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verification when decoding pkcs5

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This commit is contained in:
Sanjana Rajan 2018-02-01 13:14:26 +01:00
parent 40a8c54342
commit 5a6e65c00f
1 changed files with 9 additions and 8 deletions
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17
src/crypto/pkcs5.js
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@ -24,11 +24,8 @@
*/
function encode(msg) {
const c = 8 - (msg.length % 8);
var result = [];
for (var i = 0; i < c; ++i) {
result.push(String.fromCharCode(c));
}
return msg + result.join("");
const padding = String.fromCharCode(c).repeat(c);
return msg + padding;
}
/**
@ -37,11 +34,15 @@ function encode(msg) {
* @return {String} Text with padding removed
*/
function decode(msg) {
var len = msg.length;
const len = msg.length;
if (len > 0) {
var c = msg.charCodeAt(len - 1);
const c = msg.charCodeAt(len - 1);
if (c >= 1 && c <= 8) {
return msg.substr(0, len - c);
const provided = msg.substr(len - c);
const computed = String.fromCharCode(c).repeat(c);
if (provided === computed) {
return msg.substr(0, len - c);
}
}
}
throw new Error('Invalid padding');