/*
- * WPA Supplicant / wrapper functions for libcrypto
- * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
+ * Wrapper functions for OpenSSL libcrypto
+ * Copyright (c) 2004-2013, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
#ifdef CONFIG_OPENSSL_CMAC
#include <openssl/cmac.h>
#endif /* CONFIG_OPENSSL_CMAC */
+#ifdef CONFIG_ECC
+#include <openssl/ec.h>
+#endif /* CONFIG_ECC */
#include "common.h"
#include "wpabuf.h"
return omac1_aes_128_vector(key, 1, &data, &data_len, mac);
}
#endif /* CONFIG_OPENSSL_CMAC */
+
+
+struct crypto_bignum * crypto_bignum_init(void)
+{
+ return (struct crypto_bignum *) BN_new();
+}
+
+
+struct crypto_bignum * crypto_bignum_init_set(const u8 *buf, size_t len)
+{
+ BIGNUM *bn = BN_bin2bn(buf, len, NULL);
+ return (struct crypto_bignum *) bn;
+}
+
+
+void crypto_bignum_deinit(struct crypto_bignum *n, int clear)
+{
+ if (clear)
+ BN_clear_free((BIGNUM *) n);
+ else
+ BN_free((BIGNUM *) n);
+}
+
+
+int crypto_bignum_to_bin(const struct crypto_bignum *a,
+ u8 *buf, size_t buflen, size_t padlen)
+{
+ int num_bytes, offset;
+
+ if (padlen > buflen)
+ return -1;
+
+ num_bytes = BN_num_bytes((const BIGNUM *) a);
+ if ((size_t) num_bytes > buflen)
+ return -1;
+ if (padlen > (size_t) num_bytes)
+ offset = padlen - num_bytes;
+ else
+ offset = 0;
+
+ os_memset(buf, 0, offset);
+ BN_bn2bin((const BIGNUM *) a, buf + offset);
+
+ return num_bytes + offset;
+}
+
+
+int crypto_bignum_add(const struct crypto_bignum *a,
+ const struct crypto_bignum *b,
+ struct crypto_bignum *c)
+{
+ return BN_add((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b) ?
+ 0 : -1;
+}
+
+
+int crypto_bignum_mod(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_mod((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b,
+ bnctx);
+ BN_CTX_free(bnctx);
+
+ return res ? 0 : -1;
+}
+
+
+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;
+}
+
+
+int crypto_bignum_cmp(const struct crypto_bignum *a,
+ const struct crypto_bignum *b)
+{
+ return BN_cmp((const BIGNUM *) a, (const BIGNUM *) b);
+}
+
+
+int crypto_bignum_bits(const struct crypto_bignum *a)
+{
+ return BN_num_bits((const BIGNUM *) a);
+}
+
+
+int crypto_bignum_is_zero(const struct crypto_bignum *a)
+{
+ return BN_is_zero((const BIGNUM *) a);
+}
+
+
+int crypto_bignum_is_one(const struct crypto_bignum *a)
+{
+ return BN_is_one((const BIGNUM *) a);
+}
+
+
+#ifdef CONFIG_ECC
+
+struct crypto_ec {
+ EC_GROUP *group;
+ BN_CTX *bnctx;
+ BIGNUM *prime;
+ BIGNUM *order;
+};
+
+struct crypto_ec * crypto_ec_init(int group)
+{
+ struct crypto_ec *e;
+ int nid;
+
+ /* Map from IANA registry for IKE D-H groups to OpenSSL NID */
+ switch (group) {
+ case 19:
+ nid = NID_X9_62_prime256v1;
+ break;
+ case 20:
+ nid = NID_secp384r1;
+ break;
+ case 21:
+ nid = NID_secp521r1;
+ break;
+ case 25:
+ nid = NID_X9_62_prime192v1;
+ break;
+ case 26:
+ nid = NID_secp224r1;
+ break;
+ default:
+ return NULL;
+ }
+
+ e = os_zalloc(sizeof(*e));
+ if (e == NULL)
+ return NULL;
+
+ e->bnctx = BN_CTX_new();
+ e->group = EC_GROUP_new_by_curve_name(nid);
+ e->prime = BN_new();
+ e->order = BN_new();
+ if (e->group == NULL || e->bnctx == NULL || e->prime == NULL ||
+ e->order == NULL ||
+ !EC_GROUP_get_curve_GFp(e->group, e->prime, NULL, NULL, e->bnctx) ||
+ !EC_GROUP_get_order(e->group, e->order, e->bnctx)) {
+ crypto_ec_deinit(e);
+ e = NULL;
+ }
+
+ return e;
+}
+
+
+void crypto_ec_deinit(struct crypto_ec *e)
+{
+ if (e == NULL)
+ return;
+ BN_free(e->order);
+ EC_GROUP_free(e->group);
+ BN_CTX_free(e->bnctx);
+ os_free(e);
+}
+
+
+struct crypto_ec_point * crypto_ec_point_init(struct crypto_ec *e)
+{
+ if (e == NULL)
+ return NULL;
+ return (struct crypto_ec_point *) EC_POINT_new(e->group);
+}
+
+
+size_t crypto_ec_prime_len(struct crypto_ec *e)
+{
+ return BN_num_bytes(e->prime);
+}
+
+
+size_t crypto_ec_prime_len_bits(struct crypto_ec *e)
+{
+ return BN_num_bits(e->prime);
+}
+
+
+const struct crypto_bignum * crypto_ec_get_prime(struct crypto_ec *e)
+{
+ return (const struct crypto_bignum *) e->prime;
+}
+
+
+const struct crypto_bignum * crypto_ec_get_order(struct crypto_ec *e)
+{
+ return (const struct crypto_bignum *) e->order;
+}
+
+
+void crypto_ec_point_deinit(struct crypto_ec_point *p, int clear)
+{
+ if (clear)
+ EC_POINT_clear_free((EC_POINT *) p);
+ else
+ EC_POINT_free((EC_POINT *) p);
+}
+
+
+int crypto_ec_point_to_bin(struct crypto_ec *e,
+ const struct crypto_ec_point *point, u8 *x, u8 *y)
+{
+ BIGNUM *x_bn, *y_bn;
+ int ret = -1;
+ int len = BN_num_bytes(e->prime);
+
+ x_bn = BN_new();
+ y_bn = BN_new();
+
+ if (x_bn && y_bn &&
+ EC_POINT_get_affine_coordinates_GFp(e->group, (EC_POINT *) point,
+ x_bn, y_bn, e->bnctx)) {
+ if (x) {
+ crypto_bignum_to_bin((struct crypto_bignum *) x_bn,
+ x, len, len);
+ }
+ if (y) {
+ crypto_bignum_to_bin((struct crypto_bignum *) y_bn,
+ y, len, len);
+ }
+ ret = 0;
+ }
+
+ BN_free(x_bn);
+ BN_free(y_bn);
+ return ret;
+}
+
+
+struct crypto_ec_point * crypto_ec_point_from_bin(struct crypto_ec *e,
+ const u8 *val)
+{
+ BIGNUM *x, *y;
+ EC_POINT *elem;
+ int len = BN_num_bytes(e->prime);
+
+ x = BN_bin2bn(val, len, NULL);
+ y = BN_bin2bn(val + len, len, NULL);
+ elem = EC_POINT_new(e->group);
+ if (x == NULL || y == NULL || elem == NULL) {
+ BN_free(x);
+ BN_free(y);
+ EC_POINT_free(elem);
+ return NULL;
+ }
+
+ if (!EC_POINT_set_affine_coordinates_GFp(e->group, elem, x, y,
+ e->bnctx)) {
+ EC_POINT_free(elem);
+ elem = NULL;
+ }
+
+ BN_free(x);
+ BN_free(y);
+
+ return (struct crypto_ec_point *) elem;
+}
+
+
+int crypto_ec_point_add(struct crypto_ec *e, const struct crypto_ec_point *a,
+ const struct crypto_ec_point *b,
+ struct crypto_ec_point *c)
+{
+ return EC_POINT_add(e->group, (EC_POINT *) c, (const EC_POINT *) a,
+ (const EC_POINT *) b, e->bnctx) ? 0 : -1;
+}
+
+
+int crypto_ec_point_mul(struct crypto_ec *e, const struct crypto_ec_point *p,
+ const struct crypto_bignum *b,
+ struct crypto_ec_point *res)
+{
+ return EC_POINT_mul(e->group, (EC_POINT *) res, NULL,
+ (const EC_POINT *) p, (const BIGNUM *) b, e->bnctx)
+ ? 0 : -1;
+}
+
+
+int crypto_ec_point_invert(struct crypto_ec *e, struct crypto_ec_point *p)
+{
+ return EC_POINT_invert(e->group, (EC_POINT *) p, e->bnctx) ? 0 : -1;
+}
+
+
+int crypto_ec_point_solve_y_coord(struct crypto_ec *e,
+ struct crypto_ec_point *p,
+ const struct crypto_bignum *x, int y_bit)
+{
+ if (!EC_POINT_set_compressed_coordinates_GFp(e->group, (EC_POINT *) p,
+ (const BIGNUM *) x, y_bit,
+ e->bnctx) ||
+ !EC_POINT_is_on_curve(e->group, (EC_POINT *) p, e->bnctx))
+ return -1;
+ return 0;
+}
+
+
+int crypto_ec_point_is_at_infinity(struct crypto_ec *e,
+ const struct crypto_ec_point *p)
+{
+ return EC_POINT_is_at_infinity(e->group, (const EC_POINT *) p);
+}
+
+
+int crypto_ec_point_is_on_curve(struct crypto_ec *e,
+ const struct crypto_ec_point *p)
+{
+ return EC_POINT_is_on_curve(e->group, (const EC_POINT *) p, e->bnctx);
+}
+
+#endif /* CONFIG_ECC */
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