age.1

.\" generated with Ronn/v0.7.3
.\" http://github.com/rtomayko/ronn/tree/0.7.3
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.TH "AGE" "1" "September 2021" "" ""
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.SH "NAME"
\fBage\fR \- simple, modern, and secure file encryption
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.SH "SYNOPSIS"
\fBage\fR [\fB\-\-encrypt\fR] (\fB\-r\fR \fIRECIPIENT\fR | \fB\-R\fR \fIPATH\fR)\.\.\. [\fB\-\-armor\fR] [\fB\-o\fR \fIOUTPUT\fR] [\fIINPUT\fR]
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.br
\fBage\fR [\fB\-\-encrypt\fR] \fB\-\-passphrase\fR [\fB\-\-armor\fR] [\fB\-o\fR \fIOUTPUT\fR] [\fIINPUT\fR]
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.br
\fBage\fR \fB\-\-decrypt\fR [\fB\-i\fR \fIPATH\fR]\.\.\. [\fB\-o\fR \fIOUTPUT\fR] [\fIINPUT\fR]
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.br
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.SH "DESCRIPTION"
\fBage\fR encrypts or decrypts \fIINPUT\fR to \fIOUTPUT\fR\. The \fIINPUT\fR argument is optional and defaults to standard input\. Only a single \fIINPUT\fR file may be specified\. If \fB\-o\fR is not specified, \fIOUTPUT\fR defaults to standard output\.
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.P
If \fB\-\-passphrase\fR is specified, the file is encrypted with a passphrase requested interactively\. Otherwise, it\'s encrypted to one or more \fIRECIPIENTS\fR specified with \fB\-r\fR/\fB\-\-recipient\fR or \fB\-R\fR/\fB\-\-recipients\-file\fR\. Every recipient can decrypt the file\.
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.P
In \fB\-\-decrypt\fR mode, passphrase\-encrypted files are detected automatically and the passphrase is requested interactively\. Otherwise, one or more \fIIDENTITIES\fR specified with \fB\-i\fR/\fB\-\-identity\fR are used to decrypt the file\.
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.P
\fBage\fR encrypted files are binary and not malleable, with around 200 bytes of overhead per recipient, plus 16 bytes every 64KiB of plaintext\.
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.SH "OPTIONS"
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.TP
\fB\-o\fR, \fB\-\-output\fR=\fIOUTPUT\fR
Write encrypted or decrypted file to \fIOUTPUT\fR instead of standard output\. If \fIOUTPUT\fR already exists it will be overwritten\.
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.IP
If encrypting without \fB\-\-armor\fR, \fBage\fR will refuse to output binary to a TTY\. This can be forced by specifying \fB\-\fR as \fIOUTPUT\fR\.
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.TP
\fB\-\-version\fR
Print the version and exit\.
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.SS "Encryption options"
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.TP
\fB\-e\fR, \fB\-\-encrypt\fR
Encrypt \fIINPUT\fR to \fIOUTPUT\fR\. This is the default\.
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.TP
\fB\-r\fR, \fB\-\-recipient\fR=\fIRECIPIENT\fR
Encrypt to the explicitly specified \fIRECIPIENT\fR\. See the \fIRECIPIENTS AND IDENTITIES\fR section for possible recipient formats\.
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.IP
This option can be repeated and combined with \fB\-R\fR/\fB\-\-recipients\-file\fR, and the file can be decrypted by all provided recipients independently\.
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.TP
\fB\-R\fR, \fB\-\-recipients\-file\fR=\fIPATH\fR
Encrypt to the \fIRECIPIENTS\fR listed in the file at \fIPATH\fR, one per line\. Empty lines and lines starting with \fB#\fR are ignored as comments\.
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.IP
If \fIPATH\fR is \fB\-\fR, the recipients are read from standard input\. In this case, the \fIINPUT\fR argument must be specified\.
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.IP
This option can be repeated and combined with \fB\-r\fR/\fB\-\-recipient\fR, and the file can be decrypted by all provided recipients independently\.
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.TP
\fB\-p\fR, \fB\-\-passphrase\fR
Encrypt with a passphrase, requested interactively from the terminal\. \fBage\fR will offer to auto\-generate a secure passphrase\.
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.IP
This options can\'t be used with \fB\-r\fR/\fB\-\-recipient\fR or \fB\-R\fR/\fB\-\-recipients\-file\fR\.
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.TP
\fB\-a\fR, \fB\-\-armor\fR
Encrypt to an ASCII\-only "armored" encoding\.
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.IP
\fBage\fR armor is a strict version of PEM with type \fBAGE ENCRYPTED FILE\fR, canonical "strict" Base64, no headers, and no support for leading and trailing extra data\.
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.IP
Decryption transparently detects and decodes ASCII armoring\.
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.SS "Decryption options"
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.TP
\fB\-d\fR, \fB\-\-decrypt\fR
Decrypt \fIINPUT\fR to \fIOUTPUT\fR\.
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.IP
If \fIINPUT\fR is passphrase encrypted, it will be automatically detected and the passphrase will be requested interactively\. Otherwise, the \fIIDENTITIES\fR specified with \fB\-i\fR/\fB\-\-identity\fR are used\.
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.IP
ASCII armoring is transparently detected and decoded\.
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.TP
\fB\-i\fR, \fB\-\-identity\fR=\fIPATH\fR
Decrypt using the \fIIDENTITIES\fR at \fIPATH\fR\.
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.IP
\fIPATH\fR may be one of the following:
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.IP
a\. A file listing \fIIDENTITIES\fR one per line\. Empty lines and lines starting with "\fB#\fR" are ignored as comments\.
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.IP
b\. A passphrase encrypted age file, containing \fIIDENTITIES\fR one per line like above\. The passphrase is requested interactively\. Note that passphrase\-protected identity files are not necessary for most use cases, where access to the encrypted identity file implies access to the whole system\.
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.IP
c\. An SSH private key file, in PKCS#1, PKCS#8, or OpenSSH format\. If the private key is password\-protected, the password is requested interactively only if the SSH identity matches the file\. See the \fISSH keys\fR section for more information, including supported key types\.
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.IP
d\. "\fB\-\fR", causing one of the options above to be read from standard input\. In this case, the \fIINPUT\fR argument must be specified\.
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.IP
This option can be repeated\. Identities are tried in the order in which are provided, and the first one matching one of the file\'s recipients is used\. Unused identities are ignored\.
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.IP
If \fB\-e\fR/\fB\-\-encrypt\fR is explicitly specified (to avoid confusion), \fB\-i\fR/\fB\-\-identity\fR may also be used to encrypt to the \fBRECIPIENTS\fR corresponding to the \fBIDENTITIES\fR listed at \fIPATH\fR\. This allows using an identity file as a symmetric key, if desired\.
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.SH "RECIPIENTS AND IDENTITIES"
\fBRECIPIENTS\fR are public values, like a public key, that a file can be encrypted to\. \fBIDENTITIES\fR are private values, like a private key, that allow decrypting a file encrypted to the corresponding \fBRECIPIENT\fR\.
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.SS "Native X25519 keys"
Native \fBage\fR key pairs are generated with age\-keygen(1), and provide small encodings and strong encryption based on X25519\. They are the recommended recipient type for most applications\.
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.P
A \fBRECIPIENT\fR encoding begins with \fBage1\fR and looks like the following:
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.IP "" 4
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.nf

age1gde3ncmahlqd9gg50tanl99r960llztrhfapnmx853s4tjum03uqfssgdh
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.fi
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.IP "" 0
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.P
An \fBIDENTITY\fR encoding begins with \fBAGE\-SECRET\-KEY\-1\fR and looks like the following:
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.IP "" 4
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.nf

AGE\-SECRET\-KEY\-1KTYK6RVLN5TAPE7VF6FQQSKZ9HWWCDSKUGXXNUQDWZ7XXT5YK5LSF3UTKQ
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.fi
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.IP "" 0
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.P
An encrypted file can\'t be linked to the native recipient it\'s encrypted to without access to the corresponding identity\.
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.SS "SSH keys"
As a convenience feature, \fBage\fR also supports encrypting to RSA or Ed25519 ssh(1) keys\. RSA keys must be at least 2048 bits\. This feature employs more complex cryptography, and should only be used when a native key is not available for the recipient\. Note that SSH keys might not be protected long\-term by the recipient, since they are revokable when used only for authentication\.
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.P
A \fBRECIPIENT\fR encoding is an SSH public key in \fBauthorized_keys\fR format (see the \fBAUTHORIZED_KEYS FILE FORMAT\fR section of sshd(8)), starting with \fBssh\-rsa\fR or \fBssh\-ed25519\fR, like the following:
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.IP "" 4
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.nf

ssh\-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQDULTit0KUehbi[\.\.\.]GU4BtElAbzh8=
ssh\-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIH9pO5pz22JZEas[\.\.\.]l1uZc31FGYMXa
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.fi
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.IP "" 0
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.P
The comment at the end of the line, if present, is ignored\.
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.P
In recipient files passed to \fB\-R\fR/\fB\-\-recipients\-file\fR, unsupported but valid SSH public keys are ignored with a warning, to facilitate using \fBauthorized_keys\fR or GitHub \fB\.keys\fR files\. (See \fIEXAMPLES\fR\.)
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.P
An \fBIDENTITY\fR is an SSH private key \fIfile\fR passed individually to \fB\-i\fR/\fB\-\-identity\fR\. Note that keys held on hardware tokens such as YubiKeys or accessed via ssh\-agent(1) are not supported\.
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.P
An encrypted file \fIcan\fR be linked to the SSH public key it was encrypted to\. This is so that \fBage\fR can identify the correct SSH private key before requesting its password, if any\.
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.SH "EXIT STATUS"
\fBage\fR will exit 0 if and only if encryption or decryption are successful for the full length of the input\.
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.P
If an error occurs during decryption, partial output might still be generated, but only if it was possible to securely authenticate it\. No unauthenticathed output is ever released\.
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.SH "BACKWARDS COMPATIBILITY"
Files encrypted with a stable version (not alpha, beta, or release candidate) of \fBage\fR, or with any v1\.0\.0 beta or release candidate, will decrypt with any later version of the tool\.
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.P
If decrypting older files poses a security risk, doing so might cause an error by default\. In this case, a flag will be provided to force the operation\.
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.SH "EXAMPLES"
Generate a new identity, encrypt data, and decrypt:
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.IP "" 4
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.nf

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

$ tar cvz ~/data | age \-r age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p > data\.tar\.gz\.age

$ age \-d \-o data\.tar\.gz \-i key\.txt data\.tar\.gz\.age
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.fi
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.IP "" 0
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.P
Encrypt \fBexample\.jpg\fR to multiple recipients and output to \fBexample\.jpg\.age\fR:
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.IP "" 4
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.nf

$ age \-o example\.jpg\.age \-r age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p \e
    \-r age1lggyhqrw2nlhcxprm67z43rta597azn8gknawjehu9d9dl0jq3yqqvfafg example\.jpg
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.fi
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.IP "" 0
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.P
Encrypt to a list of recipients:
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.IP "" 4
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.nf

$ cat > recipients\.txt
# Alice
age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p
# Bob
age1lggyhqrw2nlhcxprm67z43rta597azn8gknawjehu9d9dl0jq3yqqvfafg

$ age \-R recipients\.txt example\.jpg > example\.jpg\.age
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.fi
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.IP "" 0
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.P
Encrypt and decrypt a file using a passphrase:
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.IP "" 4
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.nf

$ age \-p secrets\.txt > secrets\.txt\.age
Enter passphrase (leave empty to autogenerate a secure one):
Using the autogenerated passphrase "release\-response\-step\-brand\-wrap\-ankle\-pair\-unusual\-sword\-train"\.

$ age \-d secrets\.txt\.age > secrets\.txt
Enter passphrase:
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.fi
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.IP "" 0
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.P
Encrypt and decrypt with a passphrase\-protected identity file:
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.IP "" 4
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.nf

$ age\-keygen | age \-p > key\.age
Public key: age1yhm4gctwfmrpz87tdslm550wrx6m79y9f2hdzt0lndjnehwj0ukqrjpyx5
Enter passphrase (leave empty to autogenerate a secure one):
Using the autogenerated passphrase "hip\-roast\-boring\-snake\-mention\-east\-wasp\-honey\-input\-actress"\.

$ age \-r age1yhm4gctwfmrpz87tdslm550wrx6m79y9f2hdzt0lndjnehwj0ukqrjpyx5 secrets\.txt > secrets\.txt\.age

$ age \-d \-i key\.age secrets\.txt\.age > secrets\.txt
Enter passphrase for identity file "key\.age":
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.fi
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.IP "" 0
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.P
Encrypt and decrypt with an SSH public key:
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.IP "" 4
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.nf

$ age \-R ~/\.ssh/id_ed25519\.pub example\.jpg > example\.jpg\.age

$ age \-d \-i ~/\.ssh/id_ed25519 example\.jpg\.age > example\.jpg
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.fi
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.IP "" 0
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.P
Encrypt to the SSH keys of a GitHub user:
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.IP "" 4
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.nf

$ curl https://github\.com/benjojo\.keys | age \-R \- example\.jpg > example\.jpg\.age
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.fi
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.IP "" 0
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.SH "SEE ALSO"
age\-keygen(1)
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.SH "AUTHORS"
Filippo Valsorda \fIage@filippo\.io\fR