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🐛 Fix decryption function

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This commit is contained in:
C-3PO 2018-08-07 15:23:49 +02:00
parent 0a18475076
commit 442b576981
Signed by: c3po
GPG key ID: 62993C4BB4D86F24
1 changed files with 3 additions and 3 deletions
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6
src/ssn/decryption/modifyPassword.ts
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@ -1,11 +1,11 @@
/** Takes a password as it is included in the extra field, and returns a password that can be used to decode the file. */ /** Takes a password as it is included in the extra field, and returns a password that can be used to decode the file. */
export default function modifyPassword(passwordIn: Uint8Array) { export default function modifyPassword(passwordIn: Uint8Array): Uint8Array {
const passwordLength = passwordIn.byteLength; const passwordLength = passwordIn.byteLength;
const passwordOut = new Uint8Array(passwordLength); const passwordOut = new Uint8Array(passwordLength);
for (let i = 0; i < passwordLength; i += 1) { for (let i = 0; i < passwordLength; i += 1) {
if (passwordIn[i] === 0) { break; } if (passwordIn[i] === 0) { break; }
let curChar = passwordIn[i] + ((1 << (i % 32)) & 0xFF); let curChar = (passwordIn[i] + ((1 << (i % 32)) & 0xFF)) & 0xFF;
if (curChar > 0x7E) { if (curChar > 0x7E) {
if (curChar === 0xFF || curChar === 0x7F) { if (curChar === 0xFF || curChar === 0x7F) {
curChar = 0x3F; curChar = 0x3F;
@ -14,7 +14,7 @@ export default function modifyPassword(passwordIn: Uint8Array) {
} }
} }
if (curChar < 0x21) { if (curChar < 0x21) {
curChar = (curChar | (1 << ((curChar % 3) + 5))) + 1; curChar = ((curChar | (1 << ((curChar % 3) + 5))) + 1) & 0xFF;
} }
passwordOut[i] = curChar; passwordOut[i] = curChar;
} }