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add salted and iterated mode

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This commit is contained in:
Werner Koch 1998-08-05 18:30:53 +00:00
parent 454192d336
commit 48a041279d
1 changed files with 28 additions and 2 deletions
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30
g10/passphrase.c
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@ -196,11 +196,37 @@ hash_passphrase( DEK *dek, char *pw, STRING2KEY *s2k, int create )
dek->keylen = 0;
md = md_open( s2k->hash_algo, 1);
if( s2k->mode == 1 || s2k->mode == 3 ) {
ulong count = 0;
int len = strlen(pw);
int len2 = len + 8;
if( create )
randomize_buffer(s2k->salt, 8, 1);
md_write( md, s2k->salt, 8 );
if( s2k->mode == 3 ) {
count = (16ul + (s2k->count & 15)) << ((s2k->count >> 4) + 6);
log_info("s2k iteration count=%lu\n", count );
}
for(;;) {
md_write( md, s2k->salt, 8 );
md_write( md, pw, len );
if( count < len2 )
break;
count -= len2;
}
if( count ) {
if( count < 8 )
md_write( md, s2k->salt, count );
else {
md_write( md, s2k->salt, 8 );
count -= 8;
assert( count <= len );
md_write( md, pw, count );
}
}
}
md_write( md, pw, strlen(pw) );
else
md_write( md, pw, strlen(pw) );
md_final( md );
dek->keylen = cipher_get_keylen( dek->algo ) / 8;
assert(dek->keylen > 0 && dek->keylen <= DIM(dek->key) );