K-9 Mailsettings file
application/octet-stream
Magic Bytes
Offset: 0
3C 7E 36 3C 5C 25 5F 30 67 53 71 68 3B
The K-9 Mail Settings file is a configuration archive generated by K-9 Mail, an open-source email client for the Android operating system. This format is primarily utilized to back up user preferences, account details, and server settings, enabling seamless migration between devices or restoration of application states. These files are typically encrypted with a user-defined password to protect sensitive credentials, ensuring that account information remains secure during storage and transfer.
Validation Code
How to validate .k9s files in Python
Python
def is_k9s(file_path: str) -> bool:
"""Check if file is a valid K9S by magic bytes."""
signature = bytes([0x3C, 0x7E, 0x36, 0x3C, 0x5C, 0x25, 0x5F, 0x30, 0x67, 0x53, 0x71, 0x68, 0x3B])
with open(file_path, "rb") as f:
return f.read(13) == signatureHow to validate .k9s files in Node.js
Node.js
function isK9S(buffer: Buffer): boolean {
const signature = Buffer.from([0x3C, 0x7E, 0x36, 0x3C, 0x5C, 0x25, 0x5F, 0x30, 0x67, 0x53, 0x71, 0x68, 0x3B]);
return buffer.subarray(0, 13).equals(signature);
}
Go
func IsK9S(data []byte) bool {
signature := []byte{0x3C, 0x7E, 0x36, 0x3C, 0x5C, 0x25, 0x5F, 0x30, 0x67, 0x53, 0x71, 0x68, 0x3B}
if len(data) < 13 {
return false
}
return bytes.Equal(data[:13], signature)
}API Endpoint
GET
/api/v1/k9s
curl https://filesignature.org/api/v1/k9s