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Provide a script to regenerate the Blowfish init tables.

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Since I've recently published a program that can easily generate the
required digits of pi, and since I was messing around in sshblowf.c
already, it seemed like a good idea to provide a derivation of all
that hex data.
This commit is contained in:
Simon Tatham 2015-04-27 20:48:29 +01:00
parent d637528181
commit 2968563180
1 changed files with 21 additions and 0 deletions
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sshblowf.c
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@ -17,6 +17,27 @@ struct BlowfishContext {
/* /*
* The Blowfish init data: hex digits of the fractional part of pi. * The Blowfish init data: hex digits of the fractional part of pi.
* (ie pi as a hex fraction is 3.243F6A8885A308D3...) * (ie pi as a hex fraction is 3.243F6A8885A308D3...)
*
* If you have Simon Tatham's 'spigot' exact real calculator
* available, or any other method of generating 8336 fractional hex
* digits of pi on standard output, you can regenerate these tables
* exactly as below using the following Perl script (adjusting the
* first line or two if your pi-generator is not spigot).
open my $spig, "spigot -n -B16 -d8336 pi |";
read $spig, $ignore, 2; # throw away the leading "3."
for my $name ("parray", "sbox0".."sbox3") {
print "static const word32 ${name}[] = {\n";
my $len = $name eq "parray" ? 18 : 256;
for my $i (1..$len) {
read $spig, $word, 8;
printf "%s0x%s,", ($i%6==1 ? " " : " "), uc $word;
print "\n" if ($i == $len || $i%6 == 0);
}
print "};\n\n";
}
close $spig;
*/ */
static const word32 parray[] = { static const word32 parray[] = {
0x243F6A88, 0x85A308D3, 0x13198A2E, 0x03707344, 0xA4093822, 0x299F31D0, 0x243F6A88, 0x85A308D3, 0x13198A2E, 0x03707344, 0xA4093822, 0x299F31D0,