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Readd EC_GROUP_get_curve_GFp.

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wpa_supplicant needs this in order to get the order of the coordinate
field, apparently so that they can hash to a point.

Change-Id: I92d5df7b37b67ace5f497c25f53f16bbe134aced
Reviewed-on: https://boringssl-review.googlesource.com/1622
Reviewed-by: Adam Langley <agl@google.com>
This commit is contained in:
Adam Langley 2014-08-22 12:24:16 -07:00 committed by Adam Langley
parent 539112fd44
commit 0eb1aae207
3 changed files with 21 additions and 0 deletions
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10
crypto/ec/ec.c
View File

@ -519,6 +519,16 @@ int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
return !BN_is_zero(&group->cofactor);
}
int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *out_p, BIGNUM *out_a,
BIGNUM *out_b, BN_CTX *ctx) {
if (group->meth->group_get_curve == 0) {
OPENSSL_PUT_ERROR(EC, EC_GROUP_get_curve_GFp,
ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
return group->meth->group_get_curve(group, out_p, out_a, out_b, ctx);
}
int EC_GROUP_get_curve_name(const EC_GROUP *group) { return group->curve_name; }
int EC_GROUP_get_degree(const EC_GROUP *group) {

1
crypto/ec/ec_error.c
View File

@ -18,6 +18,7 @@
const ERR_STRING_DATA EC_error_string_data[] = {
{ERR_PACK(ERR_LIB_EC, EC_F_EC_GROUP_copy, 0), "EC_GROUP_copy"},
{ERR_PACK(ERR_LIB_EC, EC_F_EC_GROUP_get_curve_GFp, 0), "EC_GROUP_get_curve_GFp"},
{ERR_PACK(ERR_LIB_EC, EC_F_EC_GROUP_get_degree, 0), "EC_GROUP_get_degree"},
{ERR_PACK(ERR_LIB_EC, EC_F_EC_GROUP_new_by_curve_name, 0), "EC_GROUP_new_by_curve_name"},
{ERR_PACK(ERR_LIB_EC, EC_F_EC_KEY_check_key, 0), "EC_KEY_check_key"},

10
include/openssl/ec.h
View File

@ -133,6 +133,15 @@ OPENSSL_EXPORT int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order,
OPENSSL_EXPORT int EC_GROUP_get_cofactor(const EC_GROUP *group,
BIGNUM *cofactor, BN_CTX *ctx);
/* EC_GROUP_get_curve_GFp gets various parameters about a group. It sets
* |*out_p| to the order of the coordinate field and |*out_a| and |*out_b| to
* the parameters of the curve when expressed as y² = x³ + ax + b. Any of the
* output parameters can be NULL. It returns one on success and zero on
* error. */
OPENSSL_EXPORT int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *out_p,
BIGNUM *out_a, BIGNUM *out_b,
BN_CTX *ctx);
/* EC_GROUP_get_curve_name returns a NID that identifies |group|. */
OPENSSL_EXPORT int EC_GROUP_get_curve_name(const EC_GROUP *group);
@ -351,6 +360,7 @@ OPENSSL_EXPORT int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r,
#define EC_F_EC_KEY_generate_key 155
#define EC_F_ec_GFp_simple_set_compressed_coordinates 156
#define EC_F_EC_POINT_add 157
#define EC_F_EC_GROUP_get_curve_GFp 158
#define EC_R_PKPARAMETERS2GROUP_FAILURE 100
#define EC_R_NON_NAMED_CURVE 101
#define EC_R_COORDINATES_OUT_OF_RANGE 102