File size: 2,352 Bytes
46463e1 | 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 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | /**
* @license
* SPDX-License-Identifier: Apache-2.0
*/
/**
* Encrypts a plain text string utilizing a rotation and salt key
* to prevent exposure of sensitive transaction / invoice details.
*/
export function encryptData(plainText: string, secretKey: string): string {
const salt = "HBT-SECURE-VAULT-" + secretKey.length;
const combined = salt + "||" + plainText;
// Convert secretKey into a simple numeric pad
let pad = 0;
for (let i = 0; i < secretKey.length; i++) {
pad += secretKey.charCodeAt(i);
}
// Rotate characters for obfuscation
const chars: string[] = [];
for (let i = 0; i < combined.length; i++) {
let charCode = combined.charCodeAt(i);
// Apply rotational key padding
charCode = (charCode + pad + i) % 65535;
chars.push(String.fromCharCode(charCode));
}
const scrambled = chars.join('');
// Encode as Base64 safely under browser context
try {
return btoa(unescape(encodeURIComponent(scrambled)));
} catch (e) {
// Fallback if there are broad unicode failures
return btoa(scrambled);
}
}
/**
* Decrypts a scrambled cipher string back to original plain text
* using the validated passkey. Throws error on fail.
*/
export function decryptData(cipherText: string, secretKey: string): string {
let scrambled = '';
try {
scrambled = decodeURIComponent(escape(atob(cipherText)));
} catch (e) {
try {
scrambled = atob(cipherText);
} catch (err) {
throw new Error("Invalid file structure: Decryption failed.");
}
}
let pad = 0;
for (let i = 0; i < secretKey.length; i++) {
pad += secretKey.charCodeAt(i);
}
const chars: string[] = [];
for (let i = 0; i < scrambled.length; i++) {
let charCode = scrambled.charCodeAt(i);
// Reverse rotation
charCode = (charCode - pad - i) % 65535;
while (charCode < 0) charCode += 65535;
chars.push(String.fromCharCode(charCode));
}
const decrypted = chars.join('');
// Validate presence of our prefix
if (!decrypted.includes("||")) {
throw new Error("Invalid password: Secure decryption key mismatch.");
}
const parts = decrypted.split("||");
const salt = parts[0];
const payload = parts.slice(1).join("||");
if (!salt.startsWith("HBT-SECURE-VAULT-")) {
throw new Error("Corrupted backup data block.");
}
return payload;
}
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