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libsec: generalize pbkdf2_hmac_sha1() to pbkdf2_x() passing the hmac as an argument

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This commit is contained in:
cinap_lenrek 2015-09-02 11:28:11 +02:00
parent 4c52aedfe9
commit b749f36baa
4 changed files with 21 additions and 14 deletions
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7
sys/include/libsec.h
View file

@ -454,12 +454,13 @@ mpint* dh_new(DHstate *dh, mpint *p, mpint *q, mpint *g);
/* calculate shared key: k = y**x % p */
mpint* dh_finish(DHstate *dh, mpint *y);
/* 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);
/* Curve25519 elliptic curve, public key function */
void curve25519(uchar mypublic[32], uchar secret[32], uchar basepoint[32]);
/* Curve25519 diffie hellman */
void curve25519_dh_new(uchar x[32], uchar y[32]);
void curve25519_dh_finish(uchar x[32], uchar y[32], uchar z[32]);
/* password-based key derivation function 2 (rfc2898) */
void pbkdf2_x(uchar *p, ulong plen, uchar *s, ulong slen, ulong rounds, uchar *d, ulong dlen,
DigestState* (*x)(uchar*, ulong, uchar*, ulong, uchar*, DigestState*), int xlen);

2
sys/src/cmd/auth/factotum/wpapsk.c
View file

@ -63,7 +63,7 @@ pass2pmk(char *pass, char *ssid, uchar pmk[PMKlen])
{
if(hextob(pass, nil, pmk, PMKlen) == PMKlen)
return;
pbkdf2_hmac_sha1((uchar*)pass, strlen(pass), (uchar*)ssid, strlen(ssid), 4096, pmk, PMKlen);
pbkdf2_x((uchar*)pass, strlen(pass), (uchar*)ssid, strlen(ssid), 4096, pmk, PMKlen, hmac_sha1, SHA1dlen);
}
static void

2
sys/src/libauthsrv/passtokey.c
View file

@ -36,7 +36,7 @@ static void
passtoaeskey(uchar *key, char *p)
{
static char salt[] = "Plan 9 key derivation";
pbkdf2_hmac_sha1((uchar*)p, strlen(p), (uchar*)salt, sizeof(salt)-1, 9001, key, AESKEYLEN);
pbkdf2_x((uchar*)p, strlen(p), (uchar*)salt, sizeof(salt)-1, 9001, key, AESKEYLEN, hmac_sha1, SHA1dlen);
}
void

24
sys/src/libsec/port/pbkdf2.c
View file

@ -2,28 +2,34 @@
#include <mp.h>
#include <libsec.h>
/* rfc2898 */
void
pbkdf2_hmac_sha1(uchar *p, ulong plen, uchar *s, ulong slen, ulong rounds, uchar *d, ulong dlen)
pbkdf2_x(p, plen, s, slen, rounds, d, dlen, x, xlen)
uchar *p, *s, *d;
ulong plen, slen, dlen, rounds;
DigestState* (*x)(uchar*, ulong, uchar*, ulong, uchar*, DigestState*);
int xlen;
{
uchar block[SHA1dlen], tmp[SHA1dlen], tmp2[SHA1dlen];
uchar block[256], tmp[256];
ulong i, j, k, n;
DigestState *ds;
assert(xlen <= sizeof(tmp));
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));
ds = (*x)(s, slen, p, plen, nil, nil);
(*x)(tmp, 4, p, plen, block, ds);
memmove(tmp, block, xlen);
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++)
(*x)(tmp, xlen, p, plen, tmp, nil);
for(k=0; k<xlen; k++)
block[k] ^= tmp[k];
}
n = dlen > sizeof(block) ? sizeof(block) : dlen;
n = dlen > xlen ? xlen : dlen;
memmove(d, block, n);
}
}