mirror of
https://github.com/moonD4rk/HackBrowserData.git
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Roger
50 lines
2.2 KiB
Go
50 lines
2.2 KiB
Go
package chromium
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import (
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"fmt"
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"github.com/moond4rk/hackbrowserdata/crypto"
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"github.com/moond4rk/hackbrowserdata/crypto/keyretriever"
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)
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// decryptValue decrypts a Chromium-encrypted value by dispatching on the ciphertext's version
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// prefix to the matching tier in keys:
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//
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// - v10 → keys.V10 (Windows DPAPI / macOS Keychain / Linux peanuts kV10Key)
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// - v11 → keys.V11 (Linux keyring kV11Key; nil on Windows/macOS — Chromium doesn't emit v11 there)
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// - v20 → keys.V20 (Windows ABE; nil on non-Windows — Chromium doesn't emit v20 there)
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//
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// A single profile can carry mixed prefixes (Chrome 127+ upgrades on Windows; Linux session-mode
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// changes), so every applicable key must be populated upstream for lossless extraction. Missing
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// tier keys surface as decrypt errors at the ciphertext level; the extract layer treats those as
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// empty plaintexts rather than fatal errors.
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func decryptValue(keys keyretriever.MasterKeys, ciphertext []byte) ([]byte, error) {
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if len(ciphertext) == 0 {
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return nil, nil
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}
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version := crypto.DetectVersion(ciphertext)
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switch version {
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case crypto.CipherV10:
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return crypto.DecryptChromium(keys.V10, ciphertext)
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case crypto.CipherV11:
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// v11 is Linux-only and shares v10's AES-CBC path, but uses the keyring-derived kV11Key
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// rather than the peanuts-derived kV10Key — so a Linux profile with both prefixes needs
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// distinct per-tier keys to decrypt everything.
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return crypto.DecryptChromium(keys.V11, ciphertext)
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case crypto.CipherV20:
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// v20 is cross-platform AES-GCM; routed through a dedicated function so Linux/macOS CI can
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// exercise the same decryption path as Windows.
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return crypto.DecryptChromiumV20(keys.V20, ciphertext)
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case crypto.CipherV12:
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// Chromium's SecretPortalKeyProvider (Flatpak / xdg-desktop-portal) — HKDF-SHA256 +
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// AES-256-GCM with a secret retrieved via org.freedesktop.portal.Desktop. Recognized here
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// to surface an actionable "known gap" error rather than the generic "unsupported" one.
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return nil, fmt.Errorf("unsupported cipher version v12 (Chromium SecretPortal / Flatpak; not yet implemented)")
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case crypto.CipherDPAPI:
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return crypto.DecryptDPAPI(ciphertext)
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default:
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return nil, fmt.Errorf("unsupported cipher version: %s", version)
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}
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}
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