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Roger
59 lines
1.9 KiB
Go
59 lines
1.9 KiB
Go
package crypto
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// CipherVersion represents the encryption version used by Chromium browsers.
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type CipherVersion string
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const (
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// CipherV10 is Chrome 80+ encryption (AES-GCM on Windows, AES-CBC on macOS/Linux).
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CipherV10 CipherVersion = "v10"
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// CipherV11 is the Linux-only AES-CBC variant where the key comes from
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// libsecret / kwallet. Same algorithm as CipherV10; only the key source differs.
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CipherV11 CipherVersion = "v11"
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// CipherV20 is Chrome 127+ App-Bound Encryption.
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CipherV20 CipherVersion = "v20"
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// CipherV12 is Chromium's SecretPortalKeyProvider (Flatpak / xdg-desktop-portal) tier —
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// HKDF-SHA256 + AES-256-GCM with a secret retrieved via org.freedesktop.portal.Desktop.
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// Recognized by DetectVersion so decryptValue can emit a known-gap error rather than a
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// generic "unsupported cipher version" message; not yet implemented.
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CipherV12 CipherVersion = "v12"
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// CipherDPAPI is pre-Chrome 80 raw DPAPI encryption (no version prefix).
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CipherDPAPI CipherVersion = "dpapi"
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// versionPrefixLen is the byte length of the version prefix ("v10", "v20").
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versionPrefixLen = 3
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)
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// DetectVersion identifies the encryption version from a ciphertext prefix.
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func DetectVersion(ciphertext []byte) CipherVersion {
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if len(ciphertext) < versionPrefixLen {
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return CipherDPAPI
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}
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prefix := string(ciphertext[:versionPrefixLen])
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switch prefix {
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case "v10":
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return CipherV10
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case "v11":
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return CipherV11
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case "v12":
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return CipherV12
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case "v20":
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return CipherV20
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default:
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return CipherDPAPI
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}
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}
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// stripPrefix removes the version prefix (e.g. "v10") from ciphertext.
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// Returns the ciphertext unchanged if no known prefix is found.
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func stripPrefix(ciphertext []byte) []byte {
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ver := DetectVersion(ciphertext)
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if ver == CipherV10 || ver == CipherV11 || ver == CipherV12 || ver == CipherV20 {
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return ciphertext[versionPrefixLen:]
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}
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return ciphertext
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}
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