static int
bf_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
{
ossldata *od = c->ptr;
unsigned bs = gen_ossl_block_size(c);
static int bf_is_strong = -1;
/*
* Test if key len is supported. BF_set_key silently cut large keys and it
* could be a problem when user transfer crypted data from one server to
* another.
*/
if (bf_is_strong == -1)
bf_is_strong = bf_check_supported_key_len();
if (!bf_is_strong && klen > 16)
return PXE_KEY_TOO_BIG;
/* Key len is supported. We can use it. */
od->klen = klen;
memcpy(od->key, key, klen);
if (iv)
memcpy(od->iv, iv, bs);
else
memset(od->iv, 0, bs);
return 0;
}
static int
ossl_cast_ecb_decrypt(PX_Cipher *c, const uint8 *data, unsigned dlen, uint8 *res)
{
unsigned bs = gen_ossl_block_size(c);
ossldata *od = c->ptr;
const uint8 *end = data + dlen - bs;
for (; data <= end; data += bs, res += bs)
CAST_ecb_encrypt(data, res, &od->u.cast_key, CAST_DECRYPT);
return 0;
}
static int
bf_ecb_decrypt(PX_Cipher *c, const uint8 *data, unsigned dlen, uint8 *res)
{
unsigned bs = gen_ossl_block_size(c),
i;
ossldata *od = c->ptr;
for (i = 0; i < dlen / bs; i++)
BF_ecb_encrypt(data + i * bs, res + i * bs, &od->u.bf.key, BF_DECRYPT);
return 0;
}
static int
ossl_cast_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
{
ossldata *od = c->ptr;
unsigned bs = gen_ossl_block_size(c);
CAST_set_key(&od->u.cast_key, klen, key);
if (iv)
memcpy(od->iv, iv, bs);
else
memset(od->iv, 0, bs);
return 0;
}
static int
ossl_des3_ecb_decrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
uint8 *res)
{
unsigned bs = gen_ossl_block_size(c);
unsigned i;
ossldata *od = c->ptr;
for (i = 0; i < dlen / bs; i++)
DES_ecb3_encrypt((void *) (data + i * bs), (void *) (res + i * bs),
&od->u.des3.k1, &od->u.des3.k2, &od->u.des3.k3, 0);
return 0;
}
static int
ossl_des_ecb_decrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
uint8 *res)
{
unsigned bs = gen_ossl_block_size(c);
unsigned i;
ossldata *od = c->ptr;
for (i = 0; i < dlen / bs; i++)
DES_ecb_encrypt((DES_cblock *) (data + i * bs),
(DES_cblock *) (res + i * bs),
&od->u.des.key_schedule, 0);
return 0;
}
static int
ossl_aes_ecb_decrypt(PX_Cipher * c, const uint8 *data, unsigned dlen,
uint8 *res)
{
unsigned bs = gen_ossl_block_size(c);
ossldata *od = c->ptr;
const uint8 *end = data + dlen - bs;
if (!od->init)
ossl_aes_key_init(od, AES_DECRYPT);
for (; data <= end; data += bs, res += bs)
AES_ecb_encrypt(data, res, &od->u.aes_key, AES_DECRYPT);
return 0;
}
static int
ossl_des3_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
{
ossldata *od = c->ptr;
unsigned bs = gen_ossl_block_size(c);
od->klen = 24;
memset(od->key, 0, 24);
memcpy(od->key, key, klen > 24 ? 24 : klen);
if (iv)
memcpy(od->iv, iv, bs);
else
memset(od->iv, 0, bs);
return 0;
}
static int
ossl_aes_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
{
ossldata *od = c->ptr;
unsigned bs = gen_ossl_block_size(c);
if (klen <= 128 / 8)
od->klen = 128 / 8;
else if (klen <= 192 / 8)
od->klen = 192 / 8;
else if (klen <= 256 / 8)
od->klen = 256 / 8;
else
return PXE_KEY_TOO_BIG;
memcpy(od->key, key, klen);
if (iv)
memcpy(od->iv, iv, bs);
else
memset(od->iv, 0, bs);
return 0;
}
