'\" '\" Generated from file 'md5\&.man' by tcllib/doctools with format 'nroff' '\" Copyright (c) 2003, Pat Thoyts '\" .TH "md5" 3tcl 2\&.0\&.7 tcllib "MD5 Message-Digest Algorithm" .\" The -*- nroff -*- definitions below are for supplemental macros used .\" in Tcl/Tk manual entries. .\" .\" .AP type name in/out ?indent? .\" Start paragraph describing an argument to a library procedure. .\" type is type of argument (int, etc.), in/out is either "in", "out", .\" or "in/out" to describe whether procedure reads or modifies arg, .\" and indent is equivalent to second arg of .IP (shouldn't ever be .\" needed; use .AS below instead) .\" .\" .AS ?type? ?name? .\" Give maximum sizes of arguments for setting tab stops. Type and .\" name are examples of largest possible arguments that will be passed .\" to .AP later. If args are omitted, default tab stops are used. .\" .\" .BS .\" Start box enclosure. From here until next .BE, everything will be .\" enclosed in one large box. .\" .\" .BE .\" End of box enclosure. .\" .\" .CS .\" Begin code excerpt. .\" .\" .CE .\" End code excerpt. .\" .\" .VS ?version? ?br? .\" Begin vertical sidebar, for use in marking newly-changed parts .\" of man pages. The first argument is ignored and used for recording .\" the version when the .VS was added, so that the sidebars can be .\" found and removed when they reach a certain age. If another argument .\" is present, then a line break is forced before starting the sidebar. .\" .\" .VE .\" End of vertical sidebar. .\" .\" .DS .\" Begin an indented unfilled display. .\" .\" .DE .\" End of indented unfilled display. .\" .\" .SO ?manpage? .\" Start of list of standard options for a Tk widget. The manpage .\" argument defines where to look up the standard options; if .\" omitted, defaults to "options". The options follow on successive .\" lines, in three columns separated by tabs. .\" .\" .SE .\" End of list of standard options for a Tk widget. .\" .\" .OP cmdName dbName dbClass .\" Start of description of a specific option. cmdName gives the .\" option's name as specified in the class command, dbName gives .\" the option's name in the option database, and dbClass gives .\" the option's class in the option database. .\" .\" .UL arg1 arg2 .\" Print arg1 underlined, then print arg2 normally. .\" .\" .QW arg1 ?arg2? .\" Print arg1 in quotes, then arg2 normally (for trailing punctuation). .\" .\" .PQ arg1 ?arg2? .\" Print an open parenthesis, arg1 in quotes, then arg2 normally .\" (for trailing punctuation) and then a closing parenthesis. .\" .\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. .if t .wh -1.3i ^B .nr ^l \n(.l .ad b .\" # Start an argument description .de AP .ie !"\\$4"" .TP \\$4 .el \{\ . ie !"\\$2"" .TP \\n()Cu . el .TP 15 .\} .ta \\n()Au \\n()Bu .ie !"\\$3"" \{\ \&\\$1 \\fI\\$2\\fP (\\$3) .\".b .\} .el \{\ .br .ie !"\\$2"" \{\ \&\\$1 \\fI\\$2\\fP .\} .el \{\ \&\\fI\\$1\\fP .\} .\} .. .\" # define tabbing values for .AP .de AS .nr )A 10n .if !"\\$1"" .nr )A \\w'\\$1'u+3n .nr )B \\n()Au+15n .\" .if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n .nr )C \\n()Bu+\\w'(in/out)'u+2n .. .AS Tcl_Interp Tcl_CreateInterp in/out .\" # BS - start boxed text .\" # ^y = starting y location .\" # ^b = 1 .de BS .br .mk ^y .nr ^b 1u .if n .nf .if n .ti 0 .if n \l'\\n(.lu\(ul' .if n .fi .. .\" # BE - end boxed text (draw box now) .de BE .nf .ti 0 .mk ^t .ie n \l'\\n(^lu\(ul' .el \{\ .\" Draw four-sided box normally, but don't draw top of .\" box if the box started on an earlier page. .ie !\\n(^b-1 \{\ \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul' .\} .el \}\ \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul' .\} .\} .fi .br .nr ^b 0 .. .\" # VS - start vertical sidebar .\" # ^Y = starting y location .\" # ^v = 1 (for troff; for nroff this doesn't matter) .de VS .if !"\\$2"" .br .mk ^Y .ie n 'mc \s12\(br\s0 .el .nr ^v 1u .. .\" # VE - end of vertical sidebar .de VE .ie n 'mc .el \{\ .ev 2 .nf .ti 0 .mk ^t \h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n' .sp -1 .fi .ev .\} .nr ^v 0 .. .\" # Special macro to handle page bottom: finish off current .\" # box/sidebar if in box/sidebar mode, then invoked standard .\" # page bottom macro. .de ^B .ev 2 'ti 0 'nf .mk ^t .if \\n(^b \{\ .\" Draw three-sided box if this is the box's first page, .\" draw two sides but no top otherwise. .ie !\\n(^b-1 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c .\} .if \\n(^v \{\ .nr ^x \\n(^tu+1v-\\n(^Yu \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c .\} .bp 'fi .ev .if \\n(^b \{\ .mk ^y .nr ^b 2 .\} .if \\n(^v \{\ .mk ^Y .\} .. .\" # DS - begin display .de DS .RS .nf .sp .. .\" # DE - end display .de DE .fi .RE .sp .. .\" # SO - start of list of standard options .de SO 'ie '\\$1'' .ds So \\fBoptions\\fR 'el .ds So \\fB\\$1\\fR .SH "STANDARD OPTIONS" .LP .nf .ta 5.5c 11c .ft B .. .\" # SE - end of list of standard options .de SE .fi .ft R .LP See the \\*(So manual entry for details on the standard options. .. .\" # OP - start of full description for a single option .de OP .LP .nf .ta 4c Command-Line Name: \\fB\\$1\\fR Database Name: \\fB\\$2\\fR Database Class: \\fB\\$3\\fR .fi .IP .. .\" # CS - begin code excerpt .de CS .RS .nf .ta .25i .5i .75i 1i .. .\" # CE - end code excerpt .de CE .fi .RE .. .\" # UL - underline word .de UL \\$1\l'|0\(ul'\\$2 .. .\" # QW - apply quotation marks to word .de QW .ie '\\*(lq'"' ``\\$1''\\$2 .\"" fix emacs highlighting .el \\*(lq\\$1\\*(rq\\$2 .. .\" # PQ - apply parens and quotation marks to word .de PQ .ie '\\*(lq'"' (``\\$1''\\$2)\\$3 .\"" fix emacs highlighting .el (\\*(lq\\$1\\*(rq\\$2)\\$3 .. .\" # QR - quoted range .de QR .ie '\\*(lq'"' ``\\$1''\\-``\\$2''\\$3 .\"" fix emacs highlighting .el \\*(lq\\$1\\*(rq\\-\\*(lq\\$2\\*(rq\\$3 .. .\" # MT - "empty" string .de MT .QW "" .. .BS .SH NAME md5 \- MD5 Message-Digest Algorithm .SH SYNOPSIS package require \fBTcl 8\&.2\fR .sp package require \fBmd5 ?2\&.0\&.7?\fR .sp \fB::md5::md5\fR ?\fI-hex\fR? [ \fI-channel channel\fR | \fI-file filename\fR | \fIstring\fR ] .sp \fB::md5::hmac\fR ?\fI-hex\fR? \fI-key key\fR [ \fI-channel channel\fR | \fI-file filename\fR | \fIstring\fR ] .sp \fB::md5::MD5Init\fR .sp \fB::md5::MD5Update\fR \fItoken\fR \fIdata\fR .sp \fB::md5::MD5Final\fR \fItoken\fR .sp \fB::md5::HMACInit\fR \fIkey\fR .sp \fB::md5::HMACUpdate\fR \fItoken\fR \fIdata\fR .sp \fB::md5::HMACFinal\fR \fItoken\fR .sp .BE .SH DESCRIPTION .PP This package is an implementation in Tcl of the MD5 message-digest algorithm as described in RFC 1321 (1)\&. This algorithm takes an arbitrary quantity of data and generates a 128-bit message digest from the input\&. The MD5 algorithm is related to the MD4 algorithm (2) but has been strengthened against certain types of potential attack\&. MD5 should be used in preference to MD4 for new applications\&. .PP If you have \fBcritcl\fR and have built the \fBtcllibc\fR package then the implementation of the hashing function will be performed by compiled code\&. Alternatively if you have either \fBcryptkit\fR or \fBTrf\fR then either of these can be used to accelerate the digest computation\&. If no suitable compiled package is available then the pure-Tcl implementation wil be used\&. The programming interface remains the same in all cases\&. .PP \fINote\fR the previous version of this package always returned a hex encoded string\&. This has been changed to simplify the programming interface and to make this version more compatible with other implementations\&. To obtain the previous usage, either explicitly specify package version 1 or use the \fI-hex\fR option to the \fBmd5\fR command\&. .SH COMMANDS .TP \fB::md5::md5\fR ?\fI-hex\fR? [ \fI-channel channel\fR | \fI-file filename\fR | \fIstring\fR ] Calculate the MD5 digest of the data given in string\&. This is returned as a binary string by default\&. Giving the \fI-hex\fR option will return a hexadecimal encoded version of the digest\&. .sp The data to be hashed can be specified either as a string argument to the \fBmd5\fR command, or as a filename or a pre-opened channel\&. If the \fI-filename\fR argument is given then the file is opened, the data read and hashed and the file is closed\&. If the \fI-channel\fR argument is given then data is read from the channel until the end of file\&. The channel is not closed\&. .sp Only one of \fI-file\fR, \fI-channel\fR or \fIstring\fR should be given\&. .TP \fB::md5::hmac\fR ?\fI-hex\fR? \fI-key key\fR [ \fI-channel channel\fR | \fI-file filename\fR | \fIstring\fR ] Calculate an Hashed Message Authentication digest (HMAC) using the MD5 digest algorithm\&. HMACs are described in RFC 2104 (3) and provide an MD5 digest that includes a key\&. All options other than \fI-key\fR are as for the \fB::md5::md5\fR command\&. .PP .SH "PROGRAMMING INTERFACE" For the programmer, the MD5 hash can be viewed as a bucket into which one pours data\&. When you have finished, you extract a value that is derived from the data that was poured into the bucket\&. The programming interface to the MD5 hash operates on a token (equivalent to the bucket)\&. You call \fBMD5Init\fR to obtain a token and then call \fBMD5Update\fR as many times as required to add data to the hash\&. To release any resources and obtain the hash value, you then call \fBMD5Final\fR\&. An equivalent set of functions gives you a keyed digest (HMAC)\&. .TP \fB::md5::MD5Init\fR Begins a new MD5 hash\&. Returns a token ID that must be used for the remaining functions\&. .TP \fB::md5::MD5Update\fR \fItoken\fR \fIdata\fR Add data to the hash identified by token\&. Calling \fIMD5Update $token "abcd"\fR is equivalent to calling \fIMD5Update $token "ab"\fR followed by \fIMD5Update $token "cb"\fR\&. See \fBEXAMPLES\fR\&. .TP \fB::md5::MD5Final\fR \fItoken\fR Returns the hash value and releases any resources held by this token\&. Once this command completes the token will be invalid\&. The result is a binary string of 16 bytes representing the 128 bit MD5 digest value\&. .TP \fB::md5::HMACInit\fR \fIkey\fR This is equivalent to the \fB::md5::MD5Init\fR command except that it requires the key that will be included in the HMAC\&. .TP \fB::md5::HMACUpdate\fR \fItoken\fR \fIdata\fR .TP \fB::md5::HMACFinal\fR \fItoken\fR These commands are identical to the MD5 equivalent commands\&. .PP .SH EXAMPLES .CS % md5::md5 -hex "Tcl does MD5" 8AAC1EE01E20BB347104FABB90310433 .CE .CS % md5::hmac -hex -key Sekret "Tcl does MD5" 35BBA244FD56D3EDF5F3C47474DACB5D .CE .CS % set tok [md5::MD5Init] ::md5::1 % md5::MD5Update $tok "Tcl " % md5::MD5Update $tok "does " % md5::MD5Update $tok "MD5" % md5::Hex [md5::MD5Final $tok] 8AAC1EE01E20BB347104FABB90310433 .CE .SH REFERENCES .IP [1] Rivest, R\&., "The MD5 Message-Digest Algorithm", RFC 1321, MIT and RSA Data Security, Inc, April 1992\&. (\fIhttp://www\&.rfc-editor\&.org/rfc/rfc1321\&.txt\fR) .IP [2] Rivest, R\&., "The MD4 Message Digest Algorithm", RFC 1320, MIT, April 1992\&. (\fIhttp://www\&.rfc-editor\&.org/rfc/rfc1320\&.txt\fR) .IP [3] Krawczyk, H\&., Bellare, M\&. and Canetti, R\&. "HMAC: Keyed-Hashing for Message Authentication", RFC 2104, February 1997\&. (\fIhttp://www\&.rfc-editor\&.org/rfc/rfc2104\&.txt\fR) .PP .SH "BUGS, IDEAS, FEEDBACK" This document, and the package it describes, will undoubtedly contain bugs and other problems\&. Please report such in the category \fImd5\fR of the \fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&. Please also report any ideas for enhancements you may have for either package and/or documentation\&. .SH "SEE ALSO" md4, sha1 .SH KEYWORDS hashing, md5, message-digest, rfc 1320, rfc 1321, rfc 2104, security .SH CATEGORY Hashes, checksums, and encryption .SH COPYRIGHT .nf Copyright (c) 2003, Pat Thoyts .fi