Usage:
    age-keygen [-pq] [-o OUTPUT]
    age-keygen -y [-o OUTPUT] [INPUT]

Options:
    -pq                       Generate a post-quantum hybrid ML-KEM-768 + X25519 key pair.
                              (This might become the default in the future.)
    -o, --output OUTPUT       Write the result to the file at path OUTPUT.
    -y                        Convert an identity file to a recipients file.

age-keygen generates a new native X25519 or, with the -pq flag, post-quantum
hybrid ML-KEM-768 + X25519 key pair, and outputs it to standard output or to
the OUTPUT file.

When generating a key, if the output is not going to a terminal, the public key
is printed to standard error. If OUTPUT already exists, it is not overwritten.

In -y mode, age-keygen reads an identity file from INPUT or from standard
input and writes the corresponding recipient(s) to OUTPUT or to standard
output, one per line, with no comments.

Examples:

    $ age-keygen
    # created: 2021-01-02T15:30:45+01:00
    # public key: age1lvyvwawkr0mcnnnncaghunadrqkmuf9e6507x9y920xxpp866cnql7dp2z
    AGE-SECRET-KEY-1N9JEPW6DWJ0ZQUDX63F5A03GX8QUW7PXDE39N8UYF82VZ9PC8UFS3M7XA9

    $ age-keygen -pq
    # created: 2025-11-17T12:15:17+01:00
    # public key: age1pq1pd[... 1950 more characters ...]
    AGE-SECRET-KEY-PQ-1XXC4XS9DXHZ6TREKQTT3XECY8VNNU7GJ83C3Y49D0GZ3ZUME4JWS6QC3EF

    $ age-keygen -o key.txt
    Public key: age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p

    $ age-keygen -y key.txt
    age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p