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clean up AES code to use a structure instead of a key array

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(_krb5_AES_string_to_default_iterator): set to 4096 as described in
aes draft -04
(derive_key): always remove the key->schedule since its
will contain the wrong (parent key) info


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@12382 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2003-06-21 05:41:55 +00:00
parent 7d2d92fb04
commit edd4885b10
1 changed files with 25 additions and 14 deletions
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39
lib/krb5/crypto.c
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@@ -619,7 +619,7 @@ _krb5_PKCS5_PBKDF2(krb5_context context, krb5_cksumtype cktype,
return 0; return 0;
} }
int _krb5_AES_string_to_default_iterator = 45056; int _krb5_AES_string_to_default_iterator = 4096;
static krb5_error_code static krb5_error_code
AES_string_to_key(krb5_context context, AES_string_to_key(krb5_context context,
@@ -668,14 +668,20 @@ AES_string_to_key(krb5_context context,
return ret; return ret;
} }
struct krb5_aes_schedule {
AES_KEY ekey;
AES_KEY dkey;
};
static void static void
AES_schedule(krb5_context context, struct key_data *kd) AES_schedule(krb5_context context, struct key_data *kd)
{ {
AES_KEY *key = kd->schedule->data; struct krb5_aes_schedule *key = kd->schedule->data;
int bits = kd->key->keyvalue.length * 8; int bits = kd->key->keyvalue.length * 8;
AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key[0]); memset(key, 0, sizeof(*key));
AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key[1]); AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key->ekey);
AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key->dkey);
} }
/* /*
@@ -739,7 +745,7 @@ struct key_type keytype_aes128 = {
"aes-128", "aes-128",
128, 128,
16, 16,
sizeof(AES_KEY) * 2, sizeof(struct krb5_aes_schedule),
NULL, NULL,
AES_schedule, AES_schedule,
AES_salt AES_salt
@@ -750,7 +756,7 @@ struct key_type keytype_aes256 = {
"aes-256", "aes-256",
256, 256,
32, 32,
sizeof(AES_KEY) * 2, sizeof(struct krb5_aes_schedule),
NULL, NULL,
AES_schedule, AES_schedule,
AES_salt AES_salt
@@ -2047,7 +2053,7 @@ DES_PCBC_encrypt_key_ivec(krb5_context context,
void void
_krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out, _krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out,
size_t len, const void *aes_key, size_t len, const void *aes_key,
unsigned char *ivec, const int enc) unsigned char *ivec, const int encrypt)
{ {
unsigned char tmp[AES_BLOCK_SIZE]; unsigned char tmp[AES_BLOCK_SIZE];
const AES_KEY *key = aes_key; /* XXX remove this when we always have AES */ const AES_KEY *key = aes_key; /* XXX remove this when we always have AES */
@@ -2058,7 +2064,7 @@ _krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out,
* then at least one blocksize. * then at least one blocksize.
*/ */
if (enc == AES_ENCRYPT) { if (encrypt) {
while(len > AES_BLOCK_SIZE) { while(len > AES_BLOCK_SIZE) {
for (i = 0; i < AES_BLOCK_SIZE; i++) for (i = 0; i < AES_BLOCK_SIZE; i++)
@@ -2119,13 +2125,14 @@ AES_CTS_encrypt(krb5_context context,
int usage, int usage,
void *ivec) void *ivec)
{ {
AES_KEY *k = key->schedule->data; struct krb5_aes_schedule *aeskey = key->schedule->data;
char local_ivec[AES_BLOCK_SIZE]; char local_ivec[AES_BLOCK_SIZE];
AES_KEY *k;
if (encrypt) if (encrypt)
k = &k[0]; k = &aeskey->ekey;
else else
k = &k[1]; k = &aeskey->dkey;
if (len < AES_BLOCK_SIZE) if (len < AES_BLOCK_SIZE)
abort(); abort();
@@ -2456,7 +2463,7 @@ static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
&keytype_aes128, &keytype_aes128,
&checksum_sha1, &checksum_sha1,
&checksum_hmac_sha1_aes128, &checksum_hmac_sha1_aes128,
0, F_DERIVED,
AES_CTS_encrypt, AES_CTS_encrypt,
}; };
static struct encryption_type enctype_aes256_cts_hmac_sha1 = { static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
@@ -2468,7 +2475,7 @@ static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
&keytype_aes256, &keytype_aes256,
&checksum_sha1, &checksum_sha1,
&checksum_hmac_sha1_aes256, &checksum_hmac_sha1_aes256,
0, F_DERIVED,
AES_CTS_encrypt, AES_CTS_encrypt,
}; };
#endif /* ENABLE_AES */ #endif /* ENABLE_AES */
@@ -3363,6 +3370,10 @@ derive_key(krb5_context context,
ret = KRB5_CRYPTO_INTERNAL; ret = KRB5_CRYPTO_INTERNAL;
break; break;
} }
if (key->schedule) {
krb5_free_data(context, key->schedule);
key->schedule = NULL;
}
memset(k, 0, nblocks * et->blocksize); memset(k, 0, nblocks * et->blocksize);
free(k); free(k);
return ret; return ret;