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Fix KRB-FX-CF2 for enctypes with non-dense keyspaces

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It is necessary to use the RFC3961 random_to_key operation when
creating a key from a bitstring.

Signed-off-by: Nicolas Williams <nico@cryptonector.com>
This commit is contained in:
Benjamin Kaduk
2014-03-14 18:13:21 -04:00
committed by Nicolas Williams
parent cdf39f1369
commit ad57868996
1 changed files with 5 additions and 8 deletions
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13
lib/krb5/crypto.c
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@@ -2551,13 +2551,11 @@ krb5_crypto_fx_cf2(krb5_context context,
krb5_data_zero(&os1);
krb5_data_zero(&os2);
ret = krb5_enctype_keysize(context, enctype, &keysize);
ret = krb5_enctype_keybits(context, enctype, &keysize);
if (ret)
return ret;
keysize = (keysize + 7) / 8;
ret = krb5_data_alloc(&res->keyvalue, keysize);
if (ret)
goto out;
ret = krb5_crypto_prfplus(context, crypto1, pepper1, keysize, &os1);
if (ret)
goto out;
@@ -2567,13 +2565,12 @@ krb5_crypto_fx_cf2(krb5_context context,
res->keytype = enctype;
{
unsigned char *p1 = os1.data, *p2 = os2.data, *p3 = res->keyvalue.data;
unsigned char *p1 = os1.data, *p2 = os2.data;
for (i = 0; i < keysize; i++)
p3[i] = p1[i] ^ p2[i];
p1[i] ^= p2[i];
}
ret = krb5_random_to_key(context, enctype, os1.data, keysize, res);
out:
if (ret)
krb5_data_free(&res->keyvalue);
krb5_data_free(&os1);
krb5_data_free(&os2);