X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/2d3de78ad61f2118c653c41ecac184f8591d4d46..43d1332f4cc5f072de04db84f236ad01e9ab7425:/hashsum.1

diff --git a/hashsum.1 b/hashsum.1
index 8e8c475..f0bd831 100644
--- a/hashsum.1
+++ b/hashsum.1
@@ -12,9 +12,11 @@
 hashsum \- compute and verify cryptographic checksums of files
 .SH SYNOPSIS
 .B hashsum
-.RB [ \-f0ecbv ]
+.RB [ \-f0ecbpv ]
 .RB [ \-a
 .IR algorithm ]
+.RB [ \-E
+.IR encoding ]
 .IR files ...
 .SH DESCRIPTION
 The
@@ -52,6 +54,9 @@ successfully.
 .B "\-u, \-\-usage"
 Prints a brief usage summary to standard output and exits successfully.
 .TP
+.BR "\-l, \-\-list " [ \fIitem ...]
+Show lists of hash functions and encodings supported.
+.TP
 .BI "\-a, \-\-algorithm=" alg
 Use the hash algorithm
 .IR alg .
@@ -60,9 +65,20 @@ see
 .B "Hashing algorithms"
 below.
 .TP
-.B "\-l, \-\-list"
-Prints a space-separated list of available hashing algorithms to
-standard output and exits successfully.
+.BI "\-E, \-\-encoding=" encoding
+Use the given
+.I encoding
+to represent hashes in the output.  This is not interoperable with other
+programs, but it's handy, e.g., for building sha1 URNs.  The encodings
+recognized are
+.B hex
+(the default),
+.B base64
+and
+.BR base32 .
+Type
+.B hashsum \-\-list enc
+for a list of supported encodings.
 .TP
 .B "\-f, \-\-files"
 Each input file is considered to be a list of filenames which should be
@@ -106,6 +122,10 @@ Assume that the files to be hashed are binary files.  This doesn't make
 any difference in Unix systems, although it might on other platforms
 which draw a distinction.
 .TP
+.B "\-p, \-\-progress"
+Display a progress indicator while hashing large files.  The progress
+indicator is written to standard error.
+.TP
 .B "\-v, \-\-verbose"
 In conjunction with the
 .B \-c
@@ -132,19 +152,19 @@ character.  Two directives are currently understood:
 Subsequent hashes in this file were generated using the algorithm
 .IR alg .
 .TP
+.BI "#encoding " encoding
+Subsequent hashes in this file are represented using the named
+.IR encoding .
+.TP
 .BI "#escape"
 Filenames in subsequence lines are written using the `escaped' format,
 described below.
 .PP
 A
 .I "file line"
-consists of a hash, in hexadecimal, followed by a space, a
+consists of a hash, in the requested encoding, followed by a space, a
 .IR flag ,
-and the filename.  If the current hash algorithm produces
-.IR n -bit
-output, there must be
-.IR n /4
-hex digits of hash in a file line.  The
+and the filename.  The
 .I flag
 is either a star
 .RB (` * ')
@@ -241,7 +261,7 @@ processors, Tiger seems to be an efficient and strong hash function.
 It's a relatively new algorithm, however, and should probably be
 approached with an open-minded caution.
 .TP
-.B sha256 ", " sha384 " and " sha512
+.BR sha256 ", " sha384 " and " sha512
 Designed by the US National Security Agency to provide security
 commensurate with the Advanced Encryption Standard, these hash functions
 provide long outputs.  SHA-256 is fairly quick, though the longer
@@ -276,6 +296,9 @@ will emit a
 .RB ` #hash '
 directive in its output.
 .SH "SEE ALSO"
-.BR md5sum (1).
+.BR md5sum (1),
+.BR dsig (1),
+.BR catsign (1),
+.BR catcrypt (1).
 .SH "AUTHOR"
-Mark Wooding, <mdw@nsict.org>
+Mark Wooding, <mdw@distorted.org.uk>