Yubico Forum ...visit our web-store at 2009-04-13T10:42:07+01:00 https://forum.yubico.com/feed.php?f=16&t=300 2009-04-13T10:42:07+01:00 2009-04-13T10:42:07+01:00 https://forum.yubico.com/viewtopic.php?t=300&p=1389#p1389 <![CDATA[Re: AES keys: ascii<->hex]]> Greg Woods wrote:

Anybody got some code (or an algorithm that I can code) that will convert an AES key from encoded ASCII to hex? I need this as part of our project to integrate Yubikeys into an existing authentication infrastructure. We are using the YubiPAM module from freeradius to authenticate with Yubikeys, but I also want to be able to program the Yubikeys. This requires being able to enter the generated AES key into the database used by YubiPAM. However, the ykpasswd command used for YubiPAM wants the key in hex, whereas the ykpersonalize tool generates the key in encoded ASCII:

key:gtheuknkdtkgjfufbvridkvetnlffukh

I need a way to convert that to hex.

Thanks,
--Greg


Greg,

It may not be documented that well but ykpasswd will accept AES keys in either hex or modhex (or encoded ascii as you refer).

firnsy

Statistics: Posted by firnsy — Mon Apr 13, 2009 10:42 am

]]> 2009-03-27T15:26:47+01:00 2009-03-27T15:26:47+01:00 https://forum.yubico.com/viewtopic.php?t=300&p=1341#p1341 <![CDATA[Re: AES keys: ascii<->hex]]>
static const char trans[] = "cbdefghijklnrtuv";

void encode(char *dst, const unsigned char *src, int srcSize)
{
while (srcSize--) {
*dst++ = trans[*src >> 4];
*dst++ = trans[*src++ & 0xf];
}

*dst = '\0';
}

void decode(unsigned char *dst, const char *src, int dstSize)
{
unsigned char b;
bool flag = false;
const char *p1;

for (; *src, dstSize > 0; src++) {
if ((p1 = strchr(trans, tolower(*src))) == NULL)
b = 0;
else
b = (BYTE) (p1 - trans);

if (flag = !flag)
*dst = b;
else {
*dst = (*dst << 4) | b;
dst++;
dstSize--;
}
}

while (dstSize--) *dst++ = 0;
}

Regards,

JakobE
Hardware- and firmware guy @ Yubico

Statistics: Posted by Jakob — Fri Mar 27, 2009 3:26 pm

]]> 2009-03-25T22:13:31+01:00 2009-03-25T22:13:31+01:00 https://forum.yubico.com/viewtopic.php?t=300&p=1327#p1327 <![CDATA[Re: AES keys: ascii<->hex]]>

modhex: GTHEUKNKDTKGJFUFBVRIDKVETNLFFUKH
hex: 5D63E9B92D9584E41FC729F3DBA44E96

Dick

Statistics: Posted by Dick — Wed Mar 25, 2009 10:13 pm

]]> 2009-03-25T16:25:08+01:00 2009-03-25T16:25:08+01:00 https://forum.yubico.com/viewtopic.php?t=300&p=1325#p1325 <![CDATA[AES keys: ascii<->hex]]>
key:gtheuknkdtkgjfufbvridkvetnlffukh

I need a way to convert that to hex.

Thanks,
--Greg

Statistics: Posted by Greg Woods — Wed Mar 25, 2009 4:25 pm

]]>