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test: add test rsa key generate with public exponent upto 256 bits

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Add a RSA test generating a RSA key with a 256 bits public exponent.

Signed-off-by: Cedric Neveux <cedric.neveux@nxp.com>
This commit is contained in:
Cedric Neveux 2021-05-31 12:17:52 +02:00 committed by Jamie Reece Wilson
parent 16d422ee86
commit a7a81d63e1
1 changed files with 47 additions and 0 deletions
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47
tests/rsa_test.c
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@ -369,6 +369,52 @@ static int s_rsa_issue_301(int prng_idx)
return CRYPT_OK;
}
static int s_rsa_public_ubin_e(int prng_idx)
{
rsa_key key;
unsigned char e[32] = {0};
unsigned long elen = sizeof(e);
/* Check public exponent too small */
e[elen - 1] = 1;
SHOULD_FAIL_WITH(rsa_make_key_ubin_e(&yarrow_prng, prng_idx, 128, e, elen, &key),
CRYPT_INVALID_ARG);
/*
* Generate about 256 bits to check error when public exponent
* overflow.
*/
DO(rng_make_prng(elen * 8, prng_idx, &yarrow_prng, NULL));
LTC_ARGCHK(yarrow_read(e, elen, &yarrow_prng) == elen);
/* Ensure that public exponent is:
* - odd value
* - MSB is even
*/
e[elen - 1] |= 0x1;
e[0] &= ~0x1;
/* Check public exponent overflow */
/* Set high bit of MSB set to get 256 bits, to get e overflow */
e[0] |= 0x80;
SHOULD_FAIL_WITH(rsa_make_key_ubin_e(&yarrow_prng, prng_idx, 128, e, elen, &key),
CRYPT_INVALID_ARG);
/* Check public exponent not odd but e value < 256 bits */
e[elen - 1] &= ~0x1;
e[0] &= ~0x80;
SHOULD_FAIL_WITH(rsa_make_key_ubin_e(&yarrow_prng, prng_idx, 128, e, elen, &key),
CRYPT_INVALID_ARG);
/* Ensure that public exponent is odd value and e value < 256 bits */
e[elen - 1] |= 0x1;
DO(rsa_make_key_ubin_e(&yarrow_prng, prng_idx, 128, e, elen, &key));
rsa_free(&key);
return CRYPT_OK;
}
#ifdef LTC_TEST_READDIR
static int s_rsa_import_x509(const void *in, unsigned long inlen, void *key)
{
@ -426,6 +472,7 @@ int rsa_test(void)
DO(s_rsa_cryptx_issue_69());
DO(s_rsa_issue_301(prng_idx));
DO(s_rsa_public_ubin_e(prng_idx));
/* make 10 random key */
for (cnt = 0; cnt < 10; cnt++) {