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crypto: Add more bignum/EC helper functions

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These are needed for implementing SAE hash-to-element.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2019-08-27 16:33:15 +03:00 • committed by Jouni Malinen
parent 960cfee506
commit 2a1c84f4e5
3 changed files with 205 additions and 0 deletions
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45
src/crypto/crypto.h
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@ -518,6 +518,13 @@ struct crypto_bignum * crypto_bignum_init(void);
*/
struct crypto_bignum * crypto_bignum_init_set(const u8 *buf, size_t len);
/**
* crypto_bignum_init_set - Allocate memory for bignum and set the value (uint)
* @val: Value to set
* Returns: Pointer to allocated bignum or %NULL on failure
*/
struct crypto_bignum * crypto_bignum_init_uint(unsigned int val);
/**
* crypto_bignum_deinit - Free bignum
* @n: Bignum from crypto_bignum_init() or crypto_bignum_init_set()
@ -612,6 +619,19 @@ int crypto_bignum_div(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c);
/**
* crypto_bignum_addmod - d = a + b (mod c)
* @a: Bignum
* @b: Bignum
* @c: Bignum
* @d: Bignum; used to store the result of (a + b) % c
* Returns: 0 on success, -1 on failure
*/
int crypto_bignum_addmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
const struct crypto_bignum *c,
struct crypto_bignum *d);
/**
* crypto_bignum_mulmod - d = a * b (mod c)
* @a: Bignum
@ -625,6 +645,28 @@ int crypto_bignum_mulmod(const struct crypto_bignum *a,
const struct crypto_bignum *c,
struct crypto_bignum *d);
/**
* crypto_bignum_sqrmod - c = a^2 (mod b)
* @a: Bignum
* @b: Bignum
* @c: Bignum; used to store the result of a^2 % b
* Returns: 0 on success, -1 on failure
*/
int crypto_bignum_sqrmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c);
/**
* crypto_bignum_sqrtmod - returns sqrt(a) (mod b)
* @a: Bignum
* @b: Bignum
* @c: Bignum; used to store the result
* Returns: 0 on success, -1 on failure
*/
int crypto_bignum_sqrtmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c);
/**
* crypto_bignum_rshift - r = a >> n
* @a: Bignum
@ -731,6 +773,9 @@ const struct crypto_bignum * crypto_ec_get_prime(struct crypto_ec *e);
*/
const struct crypto_bignum * crypto_ec_get_order(struct crypto_ec *e);
const struct crypto_bignum * crypto_ec_get_a(struct crypto_ec *e);
const struct crypto_bignum * crypto_ec_get_b(struct crypto_ec *e);
/**
* struct crypto_ec_point - Elliptic curve point
*