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/* hashlen.c: The opiehashlen() library function.
%%% copyright-cmetz-96
This software is Copyright 1996-2001 by Craig Metz, All Rights Reserved.
The Inner Net License Version 3 applies to this software.
You should have received a copy of the license with this software. If
you didn't get a copy, you may request one from <license@inner.net>.
History:
Modified by cmetz for OPIE 2.4. Use struct opie_otpkey, isolate variables.
Created by cmetz for OPIE 2.3.
$FreeBSD$
*/
#include <sys/endian.h>
#include "opie_cfg.h"
#include "opie.h"
#include <sha.h>
#include <md4.h>
#include <md5.h>
VOIDRET opiehashlen FUNCTION((algorithm, in, out, n), int algorithm AND
VOIDPTR in AND struct opie_otpkey *out AND int n)
{
UINT4 *results = (UINT4 *)out;
UINT4 mdx_tmp[4];
switch(algorithm) {
case 3: {
SHA_CTX sha;
UINT4 digest[5];
SHA1_Init(&sha);
SHA1_Update(&sha, (unsigned char *)in, n);
SHA1_Final((unsigned char *)digest, &sha);
results[0] = digest[0] ^ digest[2] ^ digest[4];
results[1] = digest[1] ^ digest[3];
/*
* RFC2289 mandates that we convert SHA1 digest from big-endian to little
* see Appendix A.
*/
results[0] = bswap32(results[0]);
results[1] = bswap32(results[1]);
break;
}
case 4: {
MD4_CTX mdx;
MD4Init(&mdx);
MD4Update(&mdx, (unsigned char *)in, n);
MD4Final((unsigned char *)mdx_tmp, &mdx);
results[0] = mdx_tmp[0] ^ mdx_tmp[2];
results[1] = mdx_tmp[1] ^ mdx_tmp[3];
break;
}
case 5: {
MD5_CTX mdx;
MD5Init(&mdx);
MD5Update(&mdx, (unsigned char *)in, n);
MD5Final((unsigned char *)mdx_tmp, &mdx);
results[0] = mdx_tmp[0] ^ mdx_tmp[2];
results[1] = mdx_tmp[1] ^ mdx_tmp[3];
break;
}
}
}
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