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crypto: Add functions for computing the Legendre symbol and EC y^2

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These are needed to implement side-channel protection for SAE PWE
derivation for ECC.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2015-06-25 11:33:34 +03:00
parent 9e286d5ea2
commit 16841ab246
2 changed files with 90 additions and 2 deletions
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19
src/crypto/crypto.h
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@ -613,6 +613,15 @@ int crypto_bignum_is_zero(const struct crypto_bignum *a);
*/
int crypto_bignum_is_one(const struct crypto_bignum *a);
/**
* crypto_bignum_legendre - Compute the Legendre symbol (a/p)
* @a: Bignum
* @p: Bignum
* Returns: Legendre symbol -1,0,1 on success; -2 on calculation failure
*/
int crypto_bignum_legendre(const struct crypto_bignum *a,
const struct crypto_bignum *p);
/**
* struct crypto_ec - Elliptic curve context
*
@ -757,6 +766,16 @@ int crypto_ec_point_solve_y_coord(struct crypto_ec *e,
struct crypto_ec_point *p,
const struct crypto_bignum *x, int y_bit);
/**
* crypto_ec_point_compute_y_sqr - Compute y^2 = x^3 + ax + b
* @e: EC context from crypto_ec_init()
* @x: x coordinate
* Returns: y^2 on success, %NULL failure
*/
struct crypto_bignum *
crypto_ec_point_compute_y_sqr(struct crypto_ec *e,
const struct crypto_bignum *x);
/**
* crypto_ec_point_is_at_infinity - Check whether EC point is neutral element
* @e: EC context from crypto_ec_init()