Commit 133291f8 authored by Dr. Stephen Henson's avatar Dr. Stephen Henson
Browse files

New function BN_nist_mod_func which returns an appropriate function 

if the passed prime is a NIST prime.
parent e990b4f8

crypto/bn/bn.h

+2 −0
Original line number Diff line number Diff line
@@ -674,6 +674,8 @@ const BIGNUM *BN_get0_nist_prime_256(void); 
const BIGNUM *BN_get0_nist_prime_384(void);

const BIGNUM *BN_get0_nist_prime_521(void);



int (*BN_nist_mod_func(const BIGNUM *p))(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, BN_CTX *ctx);



/* library internal functions */



#define bn_expand(a,bits) ((((((bits+BN_BITS2-1))/BN_BITS2)) <= (a)->dmax)?\

crypto/bn/bn_nist.c

+15 −0
Original line number Diff line number Diff line
@@ -834,3 +834,18 @@ int BN_nist_mod_521(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, 


	return 1;

	}



int (*BN_nist_mod_func(const BIGNUM *p))(BIGNUM *r, const BIGNUM *a, const BIGNUM *field, BN_CTX *ctx)

	{

	if (BN_ucmp(&_bignum_nist_p_192, p) == 0)

		return BN_nist_mod_192;

	if (BN_ucmp(&_bignum_nist_p_224, p) == 0)

		return BN_nist_mod_224;

	if (BN_ucmp(&_bignum_nist_p_256, p) == 0)

		return BN_nist_mod_256;

	if (BN_ucmp(&_bignum_nist_p_384, p) == 0)

		return BN_nist_mod_384;

	if (BN_ucmp(&_bignum_nist_p_521, p) == 0)

		return BN_nist_mod_521;

	return 0;

	}