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always downcase the seed

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byte-swap the SHA result


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1502 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Assar Westerlund
1997-03-29 07:45:48 +00:00
parent 6554f68118
commit 502ce31054
1 changed files with 27 additions and 3 deletions
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30
lib/otp/otp_md.c
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@@ -50,6 +50,7 @@ RCSID("$Id$");
/*
* Compress len bytes from md into key
*/
static void
compressmd (OtpKey key, unsigned char *md, size_t len)
{
@@ -86,6 +87,7 @@ otp_md_init (OtpKey key,
if (p == NULL)
return -1;
strcpy (p, seed);
strlwr (p);
strcat (p, pwd);
(*init)(arg);
(*update)(arg, p, len);
@@ -208,6 +210,28 @@ otp_md5_next (OtpKey key)
&md5, res, sizeof(res));
}
/*
* For histerical reasons, in the OTP definition it's said that the
* result from SHA must be stored in little-endian order. See
* draft-ietf-otp-01.txt.
*/
static void
sha_finito_little_endian (struct sha *m, void *res)
{
u_int32_t tmp[20];
unsigned char *p = res;
int i, j;
sha_finito (m, tmp);
for (i = 0, j = 0; j < 20; i++, j += 4) {
p[j] = (unsigned char)(tmp[i] & 0xff);
p[j+1] = (unsigned char)((tmp[i] >> 8) & 0xff);
p[j+2] = (unsigned char)((tmp[i] >> 16) & 0xff);
p[j+3] = (unsigned char)((tmp[i] >> 24) & 0xff);
}
}
int
otp_sha_init (OtpKey key, char *pwd, char *seed)
{
@@ -217,7 +241,7 @@ otp_sha_init (OtpKey key, char *pwd, char *seed)
return otp_md_init (key, pwd, seed,
(void (*)(void *))sha_init,
(void (*)(void *, void *, size_t))sha_update,
(void (*)(void *, void *))sha_finito,
(void (*)(void *, void *))sha_finito_little_endian,
&sha, res, sizeof(res));
}
@@ -231,7 +255,7 @@ otp_sha_hash (char *data,
return otp_md_hash (data, len,
(void (*)(void *))sha_init,
(void (*)(void *, void *, size_t))sha_update,
(void (*)(void *, void *))sha_finito,
(void (*)(void *, void *))sha_finito_little_endian,
&sha, res, 20);
}
@@ -244,6 +268,6 @@ otp_sha_next (OtpKey key)
return otp_md_next (key,
(void (*)(void *))sha_init,
(void (*)(void *, void *, size_t))sha_update,
(void (*)(void *, void *))sha_finito,
(void (*)(void *, void *))sha_finito_little_endian,
&sha, res, sizeof(res));
}