a2fa ("annoying two-factor authentication") is a command line tool for generating and validating one-time password.
a2fa means annoying two-factor authentication. Its purpose is to get rid of phones and be able to authenticate easily. It keeps synced with Google Authenticator, Microsoft Authenticator.
Description:
- An easy-to-use substitute for 2FA apps like TOTP Google authenticator.
- Supports the OATH algorithms, such as TOTP and HOTP.
- No need for network connection.
- No need for phone.
One-liner bash script to install a2fa
sudo -v ; curl https://raw.githubusercontent.com/csyezheng/a2fa/main/scripts/install.sh | sudo bash
One-liner bash script to install a2fa
sudo -v ; curl https://raw.githubusercontent.com/csyezheng/a2fa/main/scripts/install.sh | sudo bash
One-liner PowerShell script to install a2fa
Invoke-Expression "& { $(Invoke-RestMethod 'https://raw.githubusercontent.com/csyezheng/a2fa/main/scripts/install.ps1') }"
Please see the installation
a2fa [command] [flags] [args]
Available Commands:
add Add account and its secret key
completion Generate the autocompletion script for the specified shell
generate Generate one-time password from secret key
help Help about any command
list List all added accounts and password code
remove Remove account and its secret key
update Add account and its secret key
version show version
a2fa generate [flags] <secret key>
a2fa add [flags] <account name> <secret key>
a2fa remove [flags] <account name> <account name>...
a2fa update [flags] <account name> <secret key>
a2fa list [flags] [account name] [account name]...
Commonly used flags
Flags:
-b, --base32 use base32 encoding of KEY instead of hex (default true)
-c, --counter int used for HOTP, A counter C, which counts the number of iterations
-e, --epoch int used for TOTP, epoch (T0) which is the Unix time from which to start counting time steps
-H, --hash string A cryptographic hash method H (default "SHA1")
-h, --help help for add
--hotp use event-based HOTP mode
-i, --interval int used for TOTP, an interval (Tx) which will be used to calculate the value of the counter CT (default 30)
-l, --length int A HOTP value length d (default 6)
--totp use use time-variant TOTP mode (default true)
a2fa generate [flags] <secret key>
Examples:
a2fa generate ADOO3MCCCVO5AVD6
Output: Code: 488821
Show flags and usage:
a2fa generate -h
a2fa add [flags] <account name> <secret key>
Examples:
a2fa add GitHub ADOO3MCCCVO5AVD6
Output: account added successfully
Show flags and usage:
a2fa add -h
a2fa list [flags] [account name] [account name]...Examples:
a2fa list
Output:
0. GitHUb 414033
1. Google 337590
2. Microoft 54936
3. Apple 70362
a2fa remove [flags] <account name> <account name>...
Examples:
a2fa remove GitHub
Output: accounts deleted successfully
a2fa update [flags] <account name> <secret key>
Examples:
a2fa update GitHub 5BRSSSBJUWBQBOXE
Output: account updated successfully
Show flags and usage:
a2fa update -h
If you encounter any problems, you can open an issue in our bug tracker, please fill the issue template with as much information as possible.
Refer to CONTRIBUTING.md
Apache License 2.0, see LICENSE.
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