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libsec: add pbkdf2_hmac_sha1() (from wpapsk factotum module)

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This commit is contained in:
cinap_lenrek 2015-08-20 00:45:08 +02:00
parent d3f05df5d6
commit a40c4006d2
4 changed files with 34 additions and 27 deletions
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3
sys/include/libsec.h
View file

@ -456,3 +456,6 @@ mpint* dh_new(DHstate *dh, mpint *p, mpint *g);
/* calculate shared key: k = pub ^ x % p */
mpint* dh_finish(DHstate *dh, mpint *pub);
/* password-based key derivation function 2 (RFC 2898) */
void pbkdf2_hmac_sha1(uchar *p, ulong plen, uchar *s, ulong slen, ulong rounds, uchar *d, ulong dlen);

28
sys/src/cmd/auth/factotum/wpapsk.c
View file

@ -35,32 +35,6 @@ struct State
uchar resp[PTKlen];
};
static void
pbkdf2(uchar *p, ulong plen, uchar *s, ulong slen, ulong rounds, uchar *d, ulong dlen)
{
uchar block[SHA1dlen], tmp[SHA1dlen], tmp2[SHA1dlen];
ulong i, j, k, n;
DigestState *ds;
for(i = 1; dlen > 0; i++, d += n, dlen -= n){
tmp[3] = i;
tmp[2] = i >> 8;
tmp[1] = i >> 16;
tmp[0] = i >> 24;
ds = hmac_sha1(s, slen, p, plen, nil, nil);
hmac_sha1(tmp, 4, p, plen, block, ds);
memmove(tmp, block, sizeof(tmp));
for(j = 1; j < rounds; j++){
hmac_sha1(tmp, sizeof(tmp), p, plen, tmp2, nil);
memmove(tmp, tmp2, sizeof(tmp));
for(k=0; k<sizeof(tmp); k++)
block[k] ^= tmp[k];
}
n = dlen > sizeof(block) ? sizeof(block) : dlen;
memmove(d, block, n);
}
}
static int
hextob(char *s, char **sp, uchar *b, int n)
{
@ -89,7 +63,7 @@ pass2pmk(char *pass, char *ssid, uchar pmk[PMKlen])
{
if(hextob(pass, nil, pmk, PMKlen) == PMKlen)
return;
pbkdf2((uchar*)pass, strlen(pass), (uchar*)ssid, strlen(ssid), 4096, pmk, PMKlen);
pbkdf2_hmac_sha1((uchar*)pass, strlen(pass), (uchar*)ssid, strlen(ssid), 4096, pmk, PMKlen);
}
static void

1
sys/src/libsec/port/mkfile
View file

@ -21,6 +21,7 @@ CFILES = des.c desmodes.c desECB.c desCBC.c des3ECB.c des3CBC.c\
ecc.c\
ripemd.c\
dh.c\
pbkdf2.c\
ALLOFILES=${CFILES:%.c=%.$O}

29
sys/src/libsec/port/pbkdf2.c Normal file
View file

@ -0,0 +1,29 @@
#include "os.h"
#include <mp.h>
#include <libsec.h>
void
pbkdf2_hmac_sha1(uchar *p, ulong plen, uchar *s, ulong slen, ulong rounds, uchar *d, ulong dlen)
{
uchar block[SHA1dlen], tmp[SHA1dlen], tmp2[SHA1dlen];
ulong i, j, k, n;
DigestState *ds;
for(i = 1; dlen > 0; i++, d += n, dlen -= n){
tmp[3] = i;
tmp[2] = i >> 8;
tmp[1] = i >> 16;
tmp[0] = i >> 24;
ds = hmac_sha1(s, slen, p, plen, nil, nil);
hmac_sha1(tmp, 4, p, plen, block, ds);
memmove(tmp, block, sizeof(tmp));
for(j = 1; j < rounds; j++){
hmac_sha1(tmp, sizeof(tmp), p, plen, tmp2, nil);
memmove(tmp, tmp2, sizeof(tmp));
for(k=0; k<sizeof(tmp); k++)
block[k] ^= tmp[k];
}
n = dlen > sizeof(block) ? sizeof(block) : dlen;
memmove(d, block, n);
}
}