AESGET(1) BSD General Commands Manual AESGET(1)NAMEaesget — decrypt data using Rijndael, the Advanced Encryption Standard
winner
SYNOPSISaesget-k keyfile [-s keysize]
DESCRIPTION
The aesget utility decrypts data using the Rijndael algorithm, the winner
of the Advanced Encryption Standard (AES) competition. The decryption is
done in Cipher Block Feedback (CFB-128) mode, with the salt read from the
first 128 bits (16 bytes) of the encrypted data as generated by the
aescrypt(1) utility. The encrypted data (including the salt) is read
from standard input and the decrypted plaintext is written to standard
output.
The decryption key may be read from standard input or from a file,
depending on the argument passed to the -k command-line option. If “-”
is used as a filename, the aesget utility reads as many hexadecimal dig‐
its as needed from standard input and then one additional byte to allow
for a newline separating the key from the actual data to be decrypted.
If the filename is not “-”, the aesget utility opens the specified file
and reads text lines from it until a line starting with the characters
kk= is reached. Those characters should be immediately followed by as
many hexadecimal digits as needed; the rest of the line, as well as the
rest of the file, is ignored.
The decryption key may be 128, 192, or 256 bits long. By default, the
aesget utility uses (and expects to read) a 128-bit key, unless a differ‐
ent size is supplied by the -s keysize command-line option.
EXAMPLES
Decrypt the contents of the /etc/hosts file with a key (128-bit by
default) read from a file:
aesget-k key.txt < hosts.aes > hosts.txt
Decrypt a file with a 192-bit key supplied directly:
(echo '012345678901234567890123456789012345678901234567'; cat
test.aes) | ./aesget -s 192 -k -
SEE ALSOaescrypt(1)
The SourceForge project page: http://sourceforge.net/projects/aescrypt/
HISTORY
The aesget utility was written by Eric Lee Green, and was modified to use
Rijndael rather than Twofish by Randy Kaelber. It uses the freely avail‐
able Rijndael implementation by Antoon Bosselaers and Vincent Rijmen.
This manual page was written by Peter Pentchev in 2008.
AUTHORS
The aesget utility - Eric Lee Green ⟨eric@badtux.org⟩, Randy Kaelber
⟨randyk@sourceforge.net⟩.
The manual page - Peter Pentchev ⟨roam@ringlet.net⟩.
BSD June 8, 2008 BSD
