AESCrypt is a program for encrypting/decrypting streams of data using Rijndael and Cipher Block Feedback mode (CFB-128).
Encrypt/decrypt stdin using the Advanced Encryption Standard winner "Rijndael" encryption algorithm in Cipher Block Feedback (stream) mode. Uses /dev/urandom to create a salt. Prepends the output stream with salt when encrypting, strips it off when decrypting.
Keyfile format:
kk=hexdits
where hexdits is:
32 chars for 128 bit
48 chars for 196 bits.
64 chars for 256 bits
Note that there may be other text in the file. The key must be at start of a line, and must start with 'kk=', and must be hex.
If the key file is "-", it instead reads the hex-coded key bytes off stdin and treats them as a null-terminated hex key. Care must be taken when reading the key from stdin, as you must supply exactly 33 bytes for 128 bit keys, 49 bytes for 192 bit keys, and 65 bytes for 256 bit keys. The stdin functionality is useful in those cases where having the unencrypted key in a file is undesirable, but it is less forgiving in terms of key format.
Limitations:
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