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Implement BN_rand_range

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This commit is contained in:
Juliusz Sosinowicz
2021-09-29 10:02:05 +02:00
parent 82a9f74476
commit e7c5f137be
3 changed files with 43 additions and 2 deletions
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src/ssl.c
+33 -2
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@@ -52693,11 +52693,10 @@ int wolfSSL_mask_bits(WOLFSSL_BIGNUM* bn, int n)
}
#endif
/* WOLFSSL_SUCCESS on ok */
int wolfSSL_BN_rand(WOLFSSL_BIGNUM* bn, int bits, int top, int bottom)
{
int ret = 0;
int ret = WOLFSSL_FAILURE;
int len;
int initTmpRng = 0;
WC_RNG* rng = NULL;
@@ -52770,6 +52769,38 @@ int wolfSSL_BN_rand(WOLFSSL_BIGNUM* bn, int bits, int top, int bottom)
return ret;
}
/**
* N = length of range input var
* Generate N-bit length numbers until generated number is less than range
* @param r Output number
* @param range The upper limit of generated output
* @return WOLFSSL_SUCCESS on success and WOLFSSL_FAILURE on failure
*/
int wolfSSL_BN_rand_range(WOLFSSL_BIGNUM *r, const WOLFSSL_BIGNUM *range)
{
int n;
WOLFSSL_MSG("wolfSSL_BN_rand_range");
if (r == NULL || range == NULL) {
WOLFSSL_MSG("Bad parameter");
return WOLFSSL_FAILURE;
}
n = wolfSSL_BN_num_bits(range);
if (n <= 1) {
wolfSSL_BN_zero(r);
}
else {
do {
if (wolfSSL_BN_rand(r, n, 0, 0) == WOLFSSL_FAILURE) {
WOLFSSL_MSG("wolfSSL_BN_rand error");
return WOLFSSL_FAILURE;
}
} while(wolfSSL_BN_cmp(r, range) >= 0);
}
return WOLFSSL_SUCCESS;
}
/* WOLFSSL_SUCCESS on ok
* code is same as wolfSSL_BN_rand except for how top and bottom is handled.