hashcash-1.22 - 08-Apr-2006 - Adam Back <adam@cypherspace.org> * fix progress display bug reported by Phil Marek. (When the progress reached 2^30 tests, it would reset the best seen). This involved multiple related bug fixes, complex thing to debug! * make percentage progress show more precision the larger the stamp, so progress is less boring. * remove some cruft from test.sh so it works again * change docs and code output to talk about partial hash preimages instead of partial collisions, as this is a more accurate description these days. hashcash-1.21 - 24-Mar-2006 - Adam Back <adam@cypherspace.org> * fix potential heap overflow bug reported by Andreas Seltenreich <uwi7@rz.uni-karlsruhe.de> hashcash-1.20 - 20-Dec-2005 - Adam Back <adam@cypherspace.org> * fix bug that -w reports using version 0 semantics even with version 1 stamps (was ignoring the version field and so defaulting to version 0 semantics). * rest are fedora core4 related fixes * remove dependency on openssl libcrypto.so.4 -- I compile rpm on rh9 for forwards compatibility, but then on fc4 they have only libcrypto.so.5, so the rpm fails to install with missing dependency. Dependencies are ugly so I built with static link to libcrypto.a instead of dynamic to libcrypto.so. * -mcpu is deprecated apparently so I am supposed to use the equivalent -mtune, but that doesn't work on rh9 era gcc compilers so used -march=pentium-mmx instead; I think the result should still work on 486 via Jonathan's exception catcher trapping absense of mmx cpu. * the (mode) syntax for mmx registers is deprecated, apparently we're supposed to use (vector_size) * with fc4 the strncpy builtin is more fussy about char/unsigned char matching. * with fc4 rpmbuild options getting warnings about ignoring fgets return code hashcash-1.19 - 17-Dec-2005 - Adam Back <adam@cypherspace.org> * update to documentation for hashcash_free in hashcash.h at Simon Bohlin's suggestion * fix for -mb0 reported by bas hashcash-1.18 - 05-Jul-2005 - Adam Back <adam@cypherspace.org> * add a simpler minting API to make it easier to mint stamps from VB scripting hashcash-1.17 - 30-Mar-2005 - Adam Back <adam@cypherspace.org> * fix for bug Steve Crook reported with purging and checking at same time. * fix for bug Steve Crook reported in double spend checking. (Was bug in new hashcash_db_in higher level db function). * apply patch from Jonathan Morton which fixes bug triggered when minting large stamps (over 31-bits). * fix printf vulnerability reported by Tavis Ormandy <taviso@gentoo.org> hashcash-1.16 - 15-Jan-2005 - Adam Back <adam@cypherspace.org> * fixed bug with -Z2 (and removed workaround mentioned in 1.15 changelog entry) hashcash-1.15 - 12-Jan-2005 - Adam Back <adam@cypherspace.org> * make "Hashcash:" be accepted as well as "X-Hashcash:" suggestion by Simon Josefsson <jas@extundo.com>. This way if/when the X- is dropped from hashcash headers we will not have a backwards compatibility problem. (Well not after version 1.15). * implement the -Z option to compress stamps; in fact the usage changed so -Z takes an argument: 0, 1 or 2. 0 = not compressed, 1 = compressed but not so the counter + padding is split, and 2 = very compressed, but slow. (Due to a late discovered bug 2 is the same as 1 for now until I can fix that.) * added -O x -sv to request benchtest of core x only * make code work with -DOPENSSL, think this slipped during integration of Jonathan's libfastmint as it uses some lower level openssl APIs internally. I fixed it but it might be a bit openssl version specific, if they changed the state fields at any point. (This change coincidentally I think should work around the linking with openssl problem that Hal Finney <hal@finney.org> reported). * add libhashcash.a intermediate target to make hashcash more convenient to link into other software on linux. (A suggestion from Hal Finney who was trying to link to his RPOW system.) hashcash-1.14 - 14-Dec-2004 - Adam Back <adam@cypherspace.org> * make hashcash -cX accept continuation lines starting with space as well as tab * add library function to wrap lines and use it from hashcash command line tool. * fix long vs time_t prototype mismatch that was giving compile errors on BSD; also cleaned up some warnings that can be obtained with gcc -Wall. hashcash-1.13 - 16-Oct-2004 - Adam Back <adam@cypherspace.org> * fix bug where grace period not applied to double-spend db. I think this could allow people to double-spend in the time period after the resulting premature purging and before expiry (which is the grace period) * add new feature where -e <period> can be used with -p to override the expiry given at spend time (that is stored in the double-spend db). Inspired by question from Atom Smasher <atom@suspicious.org>. * clean up some memory leaks * add hashcash_free function (DLL scenario caller can't rely on having same deallocator to call as library compiled with) * lots more function documentation in hashcash.h for library/DLL users, renamed all exported library functions to start with hashcash_ prefix. * added hashcash_version function. * added callback function to allow user quit (returns HASHCASH_USER_ABORT) and to give progress feedback. * added option -P which uses the callback to show progress. * added -O core option to allow user selection of core. * added small parameter to hashcash (to request small stamps rather than slightly larger fast to generate stamps), and -Z option to turn this on. (In fact it is not implemented yet but want to avoid changing library interface later). hashcash-1.12 - 03-Oct-2004 - Adam Back <adam@cypherspace.org> * make a HASHCASH.DLL on windows using MINGW. hashcash-1.11 - 02-Oct-2004 - Adam Back <adam@cypherspace.org> * _really_ fix trailing ascii(32) (spaces). I have no idea how I decided the 1.10 code fixed it. Must have messed up the test I was using to check it worked. hashcash-1.10 - 01-Oct-2004 - Adam Back <adam@cypherspace.org> * remove trailing ascii(32) (spaces) which padding somehow leaves hashcash-1.09 - 17-Sep-2004 - Adam Back <adam@cypherspace.org> * fix missing space between resource name and width with -cv reported by Panta Admin. * apply cumulative patch of 3 patches from Jonathan Morton. hashcash-1.08 - 12-Sep-2004 - Adam Back <adam@cypherspace.org> * fix bug reported by Panta Admin <admin@panta-rhei.dyndns.org> must have introduced in recent version where with pipe prints stamp twice. * attempt to work around MINGW problem with signals -- somehow it is changing it's mind about whether the MMX core can run from the first call to the 2nd call. But the test result is cached so it is hard to see how this happens. Not clear if this work-around will work as don't have a 486 to test on. (Work around is make single gIsMMXpresent shared between the two mmx cores, should at least result in signal call being used fewer times (max 1 time). Also pass 1 to longjmp.) * give up entirely on conditional make. One Makefile, no funky stuff. Prints info about what you need to do to compile on your platform and goes ahead and compiles with generic anyway. Make new gnu (generic) target for gcc, and normal generic with no gcc specific flags. hashcash-1.07 - 11-Sep-2004 - Adam Back <adam@cypherspace.org> * patch from J H Wilson <jhw@ieee.org> to initialize a bunch of variables (actually I had to back some of these out to get to compile on non gnu compilers -- some of those structure initializations are gnu extensions I think.) * also J H Wilson one of patch changes was to avoid mmx assembler code clobbering ebx register which is needed for fPIC support. * better randomness on windows using the CAPI rng CryptGenRandom. Still compiles using MINGW ... whee! * made a separate GNUmakefile for gnu make (it takes that one first over Makefile) and a Makefile which is the same but no ifdef stuff which confuses some other makes, and no gnu specific compile options (for x86 anyway). * add gettimeofday timer into entropy to improve randomness on systems which do not have /dev/urandom, and are not windows hashcash-1.06 - 10-Sep-2004 - Adam Back <adam@cypherspace.org> * patch from Justin Guyett <justin@soze.net> to fix unsigned error which would have made libfastmint do something odd if no minter worked. * Makefile changes to compile under MINGW (gnu for windows portability layer which produces win32 exes). new target mingw-exe * #ifdefs to avoid locking on MINGW (seems no lock support!) * #ifdefs to use longjmp instead of siglongjmp, signal instead of sigaction on MINGW * #ifdef to use chsize instead of ftruncate on MINGW hashcash-1.05 - 08-Sep-2004 - Adam Back <adam@cypherspace.org> * and another issue (last I promise!) with case comparison. 1.04 change was good; however flaw in 1.02 means 1.04 minted stamps (resource not canonicalized to lowercase) can falsely fail to verify with 1.02 - 1.00 as those versions presume canonicalized stamp. So we go back to making -C have effect on minting also. With no -C canonicalize to lowercase, with -C use resource as-is. * get rid of -W flag reserved for posix, use -M in it's place. hashcash-1.04 - 07-Sep-2004 - Adam Back <adam@cypherspace.org> * fixed issue with case comparisons -- presumed resources were in lower case at minting -- better to just ignore case during comparison. Then will accept stamps containing upper case or mixed-case resource names. * integrate fastmint_benchtest as -sv option to hashcash. * introduce COPT as well as CFLAGS as optimization subset of flags passed with CFLAGS to nested make -- suits RPM hashcash-1.03 - 07-Sep-2004 - Adam Back <adam@cypherspace.org> * remove TARGET_ARCH again, let's keep things simple. Just use CFLAGS period. * figured out what GENTOO ebuild is doing, changed ebuild file * remove recursion from hashcash_fastmint * start using TARGET_ARCH in Makefile, hope it's portable; it's an attempt to be more GENTOO ebuild friendly * Makefile change: when PACKAGE is defined build default target, otherwise echo the target info as before * removed a bunch of old code replaced by fastmint, got rid of CHROMATIX define * fix following errors reported by Atom Smasher <atom@suspicious.org> * fix width measuring bug with v0 stamps * fix resource read from stdin bug * use GNU getopt source always -- getopt on BSD behaves differently (the getopt source is smart -- it comments itself out on machines with GNU_LIBRARY so using it always is not a problem) * bug: should send the time estimate to stderr, and the stamp to stdout * -z width flag not properly error checked to enforce UTCTIME restrictions (only valid widths 6, 10 or 12 digits) * update LICENSE to note you end up with some GNU GPL taint from getopt on systems without POSIX getopt which probably forces you to use GPL as I link against it. Unless someone wants to re-write the getopt or can point me at a public domain replacement. In particular this includes BSD and MACH (OSX) and as before windows. * apply patch from Jonathan Morton <chromi@chromatix.demon.co.uk> with following fixes: * fix bug in mmx assembler code exposed by integration * add generic target in Makefile * increase benchmark work factor to improve accuracy of results (as not used at run-time) * new hashcash_quickbench() * changes to hashcash_quickbench() to give faster timing on linux x86 which has low resolution clock() (1/100th sec vs 1usec on OSX). (It was taking ~ 0.6sec on linux x86, code takes 0.1 sec now which is less noticeable) * related to above studiously avoided calling hc_per_sec() which invokes hashcash_quickbench() -- seems a shame to burn 1/10th sec in default mint creation path if user typically doesn't care about the info about how long it took. Now you have to give -s or -v to get speed info when minting. * fix case sensitivity bug reported by Atom Smasher <atom@suspicious.org> * add CPL option back to LICENSE file * add make targets for different processors * remove 2nd call of hashcash_benchtest (supposed to call hc_per_second which caches not hashcash_per_second) * enable static selection of fastmint cores, disable run time benchtest * applied fastmint fix patch from Jonathan Morton <chromi@chromatix.demon.co.uk> and re-enabled fastmint (remove -DCHROMATIX in Makefile to disable) hashcash-1.02 - 11-Aug-2004 - Adam Back <adam@cypherspace.org> * minor documentation stuff (put back ref to sha1-hashcash in hashcash.pod manpage) * add back requests to LICENSE file hashcash-1.01 - 08-Aug-2004 - Adam Back <adam@cypherspace.org> * fold in patches from by Hubert Chan <hubert@uhoreg.ca> and Justin Guyett <justin@soze.net> to clean up some stuff and fix minor bugs. * another couple of minor bug fixes. hashcash-1.00 - 07-Aug-2004 - Adam Back <adam@cypherspace.org> * increment version number, 1.x to reflect move to version 1 stamp format * explicit bits field in token (helps people who want to prevalidate header and parse, and who want to know what the intended bits were vs how lucky the sender got); new stamp size definition is min( counted_bits, explicit bits field ) * no : in resource field to make easier to parse eg with cut, awk etc * new extension field * reclaimed -x to use for passing eXtension data (old -x no longer available, use -X, which has string fixed to X-Hashcash) * put /dev/urandom macro for MAC from Jonathan Morton <chromi@chromatix.demon.co.uk> so we use /dev/urandom on MAC * copy in and adjust Makefile for Jonathan Morton's optimized minter (need to integrate) * copy in Jonathan Morton's COMPACT option (method B vs method A from fips-180-1, uses less registers) for libsha1.c * copy in next rev of minter breaks 4megahashes/sec barrier on 3.06Ghz P4 -- disabled at present until some stuff gets fixed and we figure out rpm/deb package portability * added back v0 read support (but still only generates v1) * pr5: first attempt at integrating libfastmint (some bug in my integration code, broken so far) * (pr6: libfastmint integ still not working) * pr6: made X-Hashcash header accepatance case insensitive * pr7: also reject tokens with count_bits < claimed_bits (as previous logic of setting bits = min( count_bits, claimed_bits) necessary to avoid people getting lucky * use clock() instead of wall time * expand max stamp size out to cope with 10KB extension fields * update man page and usage with v1 stuff * and release as 1.00 ready for Hubert Chan <hubert@uhoreg.ca> to package for the imminent debian release hashcash-0.33 - 13-Apr-2004 - Adam Back <adam@cypherspace.org> * allow wild card without @ sign if there is no @ sign in pattern hashcash-0.32 - 09-Apr-2004 - Adam Back <adam@cypherspace.org> * documentation fixes * change multiple regexp behavior; previous algorithm only allowed higher overrides; need to support both higher and lower overrides. This also required introducing -o option to join regexps which are set intersections where otherwise risk of uninteded override occuring and mail being rejected as spent or insufficent bits. Now revert to lexical order most specific regexp first. * wrote test script test.sh * fix a few minor bugs uncovered by above test script * -c now means check date * allow -n etc with -X * introduced -b relative to default way of specifying bits * -b is no optional, if want token fully checked, but can give -b default; or new relative to default -b +0. hashcash-0.31 - 01-Apr-2004 - Adam Back <adam@cypherspace.org> * final 0.x version (v0 format) release before 1.x version (v1 format) (bug fixes / maintenance only afterwards on 0.x version) * remove -O3 from Makefile, use -O instead as fails on HPUX or sun. * fix some out of date usage stuff in hashcash man page. * disable timing loop unless timing needed * fix multiple reciept bug in -cX/-cx reported by Junior Ang <junior@chrysant.com>. If you receive a mail multiple times because you are on the receipt list multiple times, there will be multiple hashcash headers for you. In this case it is necessary to examine the first matching, non-spent stamp. The bug was previous versions stopped on the first matching stamp and then failed because it was spent. Need to keep going and check later also matching stamps until find one which is not spent. * rationalize command line args further. No implied -m , more things that are awkward to implement but not that useful are disallowed. * change purge operation to use read-write operations in the same sdb file rather than creating a temporary file. This makes locking easier and is also aesthetically nicer. * add flock(2) database file write locking, and change creation logic to use open(2) to avoid creation db race-condition also. * make resource string case insensitive by default to match email semantics; add -C option to force case sensitivity if desired (email addresses are converted to and stored in lower case, so you have to both mint and verify with case sensitivity turned on to make use of case sensitivity) * support minting multiple resources with multiple command line args. Also if no resources given on command line, read resources from stdin. * support supplying multiple email addresses, for people who want to accept as multiple addresses. * support multiple resources on purging also. * support multiple tokens with check mode as cmd line args, if none given as args, read tokens from stdin; if -X/-x read from cmd line args, then from stdin as email (matching stamp headers skipping stamp headers) * rename default simple database to hashcash.sdb (.sdb extension), to distinguish from planned support for better database. * fix bug in PPUTS didn't match PPRINTF * fixup -l, -w, -n so they support multiple tokens also * made use of -b optional (get the default on mint & check) * added "-b default" to specify default number of bits with -s (otherwise no way to measure the default speed without specifying the number of bits -- and when this can change over time it would be inconvenient for scripting to have to separately obtain this) * added support for wildcard email addresses with '*' wildcard marker. '*' before '@' does not match '@', '*' after '@' does not match '.'. And both email addresses must contain @ sign and same number of '.' separated sub domains as wildcard address. Wildcard matching is the new default. Use -S to get plain string match. Can turn back on with -W. * increased size of random string to reduce chance of collisions between users. Now negligible chance of collision with typical token sizes. * added support for regexps. Can work from POSIX library or BSD regexp library. Use -E to get regexps. Input is always in POSIX syntax (specials are not quoted to have special action; are quoted to have plain meaning). If using BSD library still give input in POSIX syntax, it's converted to BSD internally. * implement highest matching semantics. Ensures that eg -c -b10 *@bar.invalid -b15 adam@bar.invalid will not accept a 10 bit token for adam@bar.invalid. (This is done by sorting resources highest bits required first and accepting only the first highest matching resource.) * change arg parsing so -b, -e, -g, -z, -E, -W, -S, apply to the following resources and tokens, and can be changed for later resources/tokens with tokens and args interspersed. Means you have to give these args before the resource/token or you will get defaults. hashcash-0.30 - 04-Mar-2004 - Adam Back <adam@cypherspace.org> * make -cX check multiple X-Hashcash lines until it finds the right one. Bug reported by Kyle Hasselbacher <kyle@toehold.com>. hashcash-0.29 - 04-Mar-2004 - Adam Back <adam@cypherspace.org> * fix prototype mismatch of function hashcash_check in hashcash.h vs libhc.c which caused compile failure on openBSD and freeBSD * change to make it compile on MAC OSX (need to recognize OSX and treat as unix like for headers to include) * change to make it compile on solaris 9 (and POSIX / SVR systems in general). Turns out putenv(3) is more portable than setenv(3) / unsetenv(3) * update sha1 man page to name it sha1-hashcash to avoid collision with openssl sha1(1). By default with openssl there is not actually any program named sha1, rather sha1 is a subprogram of openssl invoked "openssl sha1". However I think it may still be possible to compile that as a separate program or symlink sha1 to openssl to get that. * update sha1 man pages to refer to the other common sha1 implementations. * update LICENSE request hashcash-0.28 - 18-Sep-2003 - Adam Back <adam@cypherspace.org> * fix bug with timezone handling reported by Joris Bontje <jbontje@suespammers.org> (turns out utctime function is redundant and wrong; time(2) gives time in UTCTime (doh)). Reason for confusion is ctime is in local time, so converts UTC time into local time even if you don't want that. But c-library time handling functions are really not designed for converting back from local to UTCTime when represented as a time_t. Changed a bunch of time related stuff to fix this up. * add -g flag for grace period suggested by Marc Lehmann <pcg@goof.com> to avoid undue rejection of hashcash stamps because of clock skew (or timezone / daylight savings time off by one errors). Default for email is 2 days (48 hours) fast or slow. * change validity period default to 28 days; previous default was forever which did not match recommended email default * add -z flag to explicitly specify the width in chars of the time field. This flag deprecates and overrides the -m -e way to implicitly specify date field width. As before the default is 6 chars (date only in YYMMDD). hashcash-0.27 - 11-Sep-2003 - Adam Back <adam@cypherspace.org> * add space char after 'X-Hashcash:' header that you get with -X option * add LICENSE file hashcash-0.26 - 26-Jun-2003 - Adam Back <adam@cypherspace.org> * accidentally folded in some non-standard VERBOSE output I was playing with. This change makes it really standard output comparable to FIPS 180-1 appendices. * added a version number -- use -V to display it. Also -v (lowercase) by itself with no other arguments displays the version umber also. * bug fix for quiet output (when not going to a pipe, still need to see output!) * update everything to point at http://www.hashcash.org now we have the domain courtesy of it's previous owner Ashish Gulhati <agul@cpan.org> (at no charge -- he declined my offer to pay for it and instead gave it to me!) * made a man page for sha1 utility also. * add -X option which is a shorthand version of -x 'X-Hashcash:' * remove leading and trailing blanks from hashcash tokens to make them more robustly survive email transit. hashcash-0.25 - 15-May-2003 - Adam Back <adam@cypherspace.org> * fix VERBOSE trace output of sha1 implementation to match FIPS 180-1 standard test vector examples (Note: this no impact on the result, just allows direct comparison to the test vectors in 180-1). The FIPS 180-1 VERBOSE output got broken when I unrolled the rotates in the round function. * remove the automatic turning on of quiet mode if the output is a pipe per note from Simon Josefsson <jas@extundo.com> about how that can be inconvenient for scripting hashcash-0.24 - 15-Mar-2003 - Adam Back <adam@cypherspace.org> * fix minor error which made hashcash_expected_tries a tiny amount less efficient than realised hashcash-0.23 - 15-Mar-2003 - Adam Back <adam@cypherspace.org> * fix error in libhc would always fail in hashcash_check reported by Alan Barclay <gorilla@elaine.furryape.com>; note this bug does not affect the hashcash command line tool as it does not use this API * minor Makefile changes hashcash-0.22 - 16-Aug-2002 - Adam Back <adam@cypherspace.org> * fix uninitialized counter string in hashcash_per_sec, bug reported by Mathias Langer hashcash-0.21 - 15-Aug-2002 - Adam Back <adam@cypherspace.org> * fix compile warnings with VC++ 6. hashcash-0.20 - 13-Aug-2002 - Adam Back <adam@cypherspace.org> * change format to include version number * change collision to be on 0^k string instead of on SHA1(date:resource) hashcash-0.19 - 25-Apr-2002 - Adam Back <adam@cypherspace.org> * fix bug reported that minting always returns failure * fix erroneous logic involving validation of validity periods hashcash-0.18 - 23-Mar-2002 - Adam Back <adam@cypherspace.org> * fix token parsing to allow resource names with :s in them (eg. urls etc) * change hashcash_mint API a bit * add programming APIs for all other functions except double spend db, and move library code to libhc.c hashcash-0.17 - 23-Mar-2002 - Adam Back <adam@cypherspace.org> * add programming API for hashcash_mint * separate hashcash tool program from hashcash library code * remove trailing 'Z' option for times -- adds no value hashcash-0.16 - 15-Mar-2002 - Adam Back <adam@cypherspace.org> * minor clean up stuff: * allow longer collision strings for compatibility with future versions * reject collision strings with non-printable and non ascii chars (< ascii(32) and > ascii(127) * make install now installs man page * fix VMS compile warning * fix bad portability assumption about time_t being signed * simple VMS scripting build script hashcash-0.15 - 14-Mar-2002 - Adam Back <adam@cypherspace.org> * deal with unix, DOS, and mac lf endings (rather than just unix) * fix bug reported by Doc.Cypher <doc_cypher@redneck.gacracker.org> * modifications to compile under VC++ 6.0 on win32 * add -i feature hashcash-0.14 - 13-Mar-2002 - Adam Back <adam@cypherspace.org> * revamped flags and arguments * lots of new options and features * more safe error reporting (avoid risk of false positives) * fix all warnings * make compile on machines with 64 bit longs * make compile on IRIX * make Makefile more portable * more reliable timing strategy * remove separate endian.c -- put endian stuff in libsha1.c * create man page * update documentation * re-implement SDB simple database to have a more standard interface to facilitate plugging in gdb etc * import random number interface to /dev/urandom hashcash-0.13 - 03-Mar-2002 - Adam Back <adam@cypherspace.org> * fix bug introduced in 0.12 * update documentation hashcash-0.12 - 03-Mar-2002 - Adam Back <adam@cypherspace.org> * add option to verify resource name given on command line matches resource name in collision * also more compatible with 0.10 command line as a result * add option to print resource name parsed from collision hashcash-0.11 - 02-Mar-2002 - Adam Back <adam@cypherspace.org> * fix buffer overflow reported by Max Greenius * add -v mode suggested by Michael Shinn * add interactive mode instead of usage as default, another suggestion from Michael Shinn * add explicit -h for usage * add -q mode for even quieter output (batch like mode) * add -x option to take collision to verify from stdin * update the documentation in readme.txt to reflect new format and options * add install target to makefile to install binaries for hashcash and sha1 in /usr/local/bin, another suggestion from Michael Shinn hashcash-0.10 - 20-Feb-2002 - Michael Shinn <mike@shinn.net> * change output format slightly to make it easier to recognize the collision amongst the verbose output hashcash-0.09 - 25-May-2001 - Adam Back <adam@cypherspace.org> * clean up sha1.h * add simple makefile * fix bug in endian.h with linux redhat62 * change format to use : delimiters * changed old version numers to be two digit * standardised on bsd indentation hashcash-0.08 - 28-Feb-2000 - Adam Back <adam@cypherspace.org> * support for openSSL sha1 (-DOPENSSL) hashcash-0.07 - 08-Dec-1997 - Adam Back <adam@cypherspace.org> * bug fix in SHA1 code hashcash-0.06 - 07-May-1997 - Andy Dustman <andy@CCMSD.chem.uga.edu> * bug fix + SPARSE compile option for library use hashcash-0.05 - 07-Mar-1997 - Adam Back <adam@cypherspace.org> * made mods as suggested by Andy Dustman <andy@CCMSD.chem.uga.edu> to avoid collision collisions on larger collision lengths previous method was bugged hashcash-0.04 - 31-Mar-1997 - Adam Back <adam@cypherspace.org> * no description hashcash-0.03 - 30-Mar-1997 - Adam Back <adam@cypherspace.org> * put in fast SHA1, and other mods giving a 4x speedup * plus a few bug fixes hashcash-0.02 - 28-Mar-1997 - Chris Kuethe <ckuethe@gpu.srv.ualberta.ca> * added minimal macintosh support (Think C) hashcash-0.01 - 27-Mar-1997 - Adam Back <adam@cypherspace.org> * first version