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fix API for const qualifier and add modp256_shift

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This commit is contained in:
NIIBE Yutaka 2011-10-11 09:39:21 +09:00
parent 41272c2ab7
commit 89bc2ed0a3
2 changed files with 34 additions and 8 deletions
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33
src/modp256.c
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@ -63,7 +63,7 @@ modp256_add (bn256 *X, const bn256 *A, const bn256 *B)
* @brief X = (A - B) mod p256
*/
void
modp256_sub (bn256 *X, bn256 *A, bn256 *B)
modp256_sub (bn256 *X, const bn256 *A, const bn256 *B)
{
int borrow;
@ -76,7 +76,7 @@ modp256_sub (bn256 *X, bn256 *A, bn256 *B)
* @brief X = A mod p256
*/
void
modp256_reduce (bn256 *X, bn512 *A)
modp256_reduce (bn256 *X, const bn512 *A)
{
bn256 tmp[1];
@ -189,7 +189,7 @@ modp256_reduce (bn256 *X, bn512 *A)
* @brief X = (A * B) mod p256
*/
void
modp256_mul (bn256 *X, bn256 *A, bn256 *B)
modp256_mul (bn256 *X, const bn256 *A, const bn256 *B)
{
bn512 AB[1];
@ -201,7 +201,7 @@ modp256_mul (bn256 *X, bn256 *A, bn256 *B)
* @brief X = A * A mod p256
*/
void
modp256_sqr (bn256 *X, bn256 *A)
modp256_sqr (bn256 *X, const bn256 *A)
{
bn512 AA[1];
@ -266,3 +266,28 @@ modp256_inv (bn256 *C, const bn256 *a)
}
}
}
/**
* @brief X = (A << shift) mod p256
* @note shift <= 32
*/
void
modp256_shift (bn256 *X, const bn256 *A, int shift)
{
int carry;
carry = bn256_shift (X, A, shift);
if (shift < 0)
return;
while (carry)
{
int borrow;
borrow = bn256_sub (X, X, P256);
carry -= borrow;
}
if (bn256_is_ge (X, P256))
bn256_sub (X, X, P256);
}

9
src/modp256.h
View File

@ -2,8 +2,9 @@ extern bn256 p256;
#define P256 (&p256)
void modp256_add (bn256 *X, const bn256 *A, const bn256 *B);
void modp256_sub (bn256 *X, bn256 *A, bn256 *B);
void modp256_reduce (bn256 *X, bn512 *A);
void modp256_mul (bn256 *X, bn256 *A, bn256 *B);
void modp256_sqr (bn256 *X, bn256 *A);
void modp256_sub (bn256 *X, const bn256 *A, const bn256 *B);
void modp256_reduce (bn256 *X, const bn512 *A);
void modp256_mul (bn256 *X, const bn256 *A, const bn256 *B);
void modp256_sqr (bn256 *X, const bn256 *A);
void modp256_inv (bn256 *C, const bn256 *a);
void modp256_shift (bn256 *X, const bn256 *A, int shift);