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Add more crypto_bignum_*() wrappers

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These operations will be needed for SAE FCC group operations.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2013-01-05 20:59:46 +02:00
parent 6917c9e829
commit 305fe835d4
2 changed files with 161 additions and 0 deletions
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69
src/crypto/crypto.h
View file

@ -520,6 +520,75 @@ int crypto_bignum_mod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c);
/**
* crypto_bignum_exptmod - Modular exponentiation: d = a^b (mod c)
* @a: Bignum; base
* @b: Bignum; exponent
* @c: Bignum; modulus
* @d: Bignum; used to store the result of a^b (mod c)
* Returns: 0 on success, -1 on failure
*/
int crypto_bignum_exptmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
const struct crypto_bignum *c,
struct crypto_bignum *d);
/**
* crypto_bignum_rshift - b = a >> n
* @a: Bignum
* @n: Number of bits to shift
* @b: Bignum; used to store the result of a >> n
* Returns: 0 on success, -1 on failure
*/
int crypto_bignum_rshift(const struct crypto_bignum *a, int n,
struct crypto_bignum *b);
/**
* crypto_bignum_inverse - Inverse a bignum so that a * c = 1 (mod b)
* @a: Bignum
* @b: Bignum
* @c: Bignum; used to store the result
* Returns: 0 on success, -1 on failure
*/
int crypto_bignum_inverse(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c);
/**
* crypto_bignum_sub - c = a - b
* @a: Bignum
* @b: Bignum
* @c: Bignum; used to store the result of a - b
* Returns: 0 on success, -1 on failure
*/
int crypto_bignum_sub(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c);
/**
* crypto_bignum_div - c = a / b
* @a: Bignum
* @b: Bignum
* @c: Bignum; used to store the result of a / b
* Returns: 0 on success, -1 on failure
*/
int crypto_bignum_div(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c);
/**
* crypto_bignum_mulmod - 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_mulmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
const struct crypto_bignum *c,
struct crypto_bignum *d);
/**
* struct crypto_ec - Elliptic curve context
*

92
src/crypto/crypto_openssl.c
View file

@ -895,6 +895,98 @@ int crypto_bignum_mod(const struct crypto_bignum *a,
}
int crypto_bignum_exptmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
const struct crypto_bignum *c,
struct crypto_bignum *d)
{
int res;
BN_CTX *bnctx;
bnctx = BN_CTX_new();
if (bnctx == NULL)
return -1;
res = BN_mod_exp((BIGNUM *) d, (const BIGNUM *) a, (const BIGNUM *) b,
(const BIGNUM *) c, bnctx);
BN_CTX_free(bnctx);
return res ? 0 : -1;
}
int crypto_bignum_rshift(const struct crypto_bignum *a, int n,
struct crypto_bignum *b)
{
return BN_rshift((BIGNUM *) b, (const BIGNUM *) a, n) ? 0 : -1;
}
int crypto_bignum_inverse(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c)
{
BIGNUM *res;
BN_CTX *bnctx;
bnctx = BN_CTX_new();
if (bnctx == NULL)
return -1;
res = BN_mod_inverse((BIGNUM *) c, (const BIGNUM *) a,
(const BIGNUM *) b, bnctx);
BN_CTX_free(bnctx);
return res ? 0 : -1;
}
int crypto_bignum_sub(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c)
{
return BN_sub((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b) ?
0 : -1;
}
int crypto_bignum_div(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c)
{
int res;
BN_CTX *bnctx;
bnctx = BN_CTX_new();
if (bnctx == NULL)
return -1;
res = BN_div((BIGNUM *) c, NULL, (const BIGNUM *) a,
(const BIGNUM *) b, bnctx);
BN_CTX_free(bnctx);
return res ? 0 : -1;
}
int crypto_bignum_mulmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
const struct crypto_bignum *c,
struct crypto_bignum *d)
{
int res;
BN_CTX *bnctx;
bnctx = BN_CTX_new();
if (bnctx == NULL)
return -1;
res = BN_mod_mul((BIGNUM *) d, (const BIGNUM *) a, (const BIGNUM *) b,
(const BIGNUM *) c, bnctx);
BN_CTX_free(bnctx);
return res ? 0 : -1;
}
#ifdef CONFIG_ECC
struct crypto_ec {