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crypto: rsa - limit supported key lengths 

Introduce constrains for RSA keys lengths.
Only key lengths of 512, 1024, 1536, 2048, 3072, and 4096 bits
will be supported.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
hifive-unleashed-5.1
Tadeusz Struk 2015-07-15 15:28:43 -07:00 committed by Herbert Xu
parent a990532023
commit 6e8ec66c3d
1 changed files with 25 additions and 1 deletions
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26
crypto/rsa.c
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@ -267,12 +267,36 @@ err_free_m:
return ret;
}
static int rsa_check_key_length(unsigned int len)
{
switch (len) {
case 512:
case 1024:
case 1536:
case 2048:
case 3072:
case 4096:
return 0;
}
return -EINVAL;
}
static int rsa_setkey(struct crypto_akcipher *tfm, const void *key,
unsigned int keylen)
{
struct rsa_key *pkey = akcipher_tfm_ctx(tfm);
int ret;
return rsa_parse_key(pkey, key, keylen);
ret = rsa_parse_key(pkey, key, keylen);
if (ret)
return ret;
if (rsa_check_key_length(mpi_get_size(pkey->n) << 3)) {
rsa_free_key(pkey);
ret = -EINVAL;
}
return ret;
}
static void rsa_exit_tfm(struct crypto_akcipher *tfm)