ref: 354b56d6bfdca067a6f04a39c4ce4bc9c0160861
dir: /man/1/crypt/
.TH CRYPT 1 .SH NAME crypt, aescbc \- data encryption .SH SYNOPSIS .B crypt [ .B -d ] [ .BI -a " alg\fP\fR[\f5/\fP\fIalg\fP\fR]\fP" ] [ .BI -f " keyfile" ] [ .BI -k " key" ] [ .B -? ] .PP .B auth/aescbc [ .B -d ] [ .B -e ] [ .BI -f " keyfile" ] [ .BI -k " key" ] .SH DESCRIPTION .I Crypt reads a data stream from its standard input and writes it encrypted to standard output, preceded by a header that gives details of the algorithm used. If the .B -d option is given, .I crypt decrypts the standard input instead, writing the clear text on standard output. The options are: .TP .BI -a " alg..." Specifies one or two algorithms, for encryption and/or digests. The algorithms are those supported by .IR ssl (3). If two algorithms are given, they should be separated by a slash .RB ( / ) or space, following the conventions of .IR ssl (3). .TP .BI -f " keyfile" Read the encryption key from the given file, which obviously should be carefully protected. Trailing newlines are ignored. .TP .BI -k " key" Use .I key as the encryption key. .TP .B -? Print a list of the available encryption and digest algorithms. .PP If the secret .I key is not otherwise supplied, .I crypt prompts for it on .BR /dev/cons . There is no need to give algorithms when decrypting, because they are taken from the header. The default algorithm is .BR md5/ideacbc . It might be necessary to change that when using .I crypt for commercial purposes, as noted in .IR keyring-crypt (2). .PP .I Aescbc encrypts and decrypts using AES (Rijndael) in cypher block chaining (CBC) mode. It uses input and output formats compatible with Plan 9's .I aescbc command; it also accepts input in the format used by .IR keyfs (4) and Plan 9's .IR secstore . The .B -e option causes it to encrypt; the .B -d option to decrypt. The other options are just as for .IR crypt . .SH SOURCE .B /appl/cmd/crypt.b .br .B /appl/cmd/auth/aescbc.b .SH SEE ALSO .IR ssl (3), .IR keyfs (4)