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Add new APIs EC_curve_nist2nid and EC_curve_nid2nist which convert

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between NIDs and the more common NIST names such as "P-256". Enhance
ecparam utility and ECC method to recognise the NIST names for curves.
(backport from HEAD)
This commit is contained in:
Dr. Stephen Henson
2012-04-06 17:35:01 +00:00
parent 37b16c84bb
commit a068a1d0e3
6 changed files with 71 additions and 2 deletions
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49
crypto/ec/ec_curve.c
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@@ -69,6 +69,7 @@
*
*/
#include <string.h>
#include "ec_lcl.h"
#include <openssl/err.h>
#include <openssl/obj_mac.h>
@@ -2098,3 +2099,51 @@ size_t EC_get_builtin_curves(EC_builtin_curve *r, size_t nitems)
return curve_list_length;
}
/* Functions to translate between common NIST curve names and NIDs */
typedef struct {
const char *name; /* NIST Name of curve */
int nid; /* Curve NID */
} EC_NIST_NAME;
static EC_NIST_NAME nist_curves[] = {
{"B-163", NID_sect163r2},
{"B-233", NID_sect233r1},
{"B-283", NID_sect283r1},
{"B-409", NID_sect409r1},
{"B-571", NID_sect571r1},
{"K-163", NID_sect163k1},
{"K-233", NID_sect233k1},
{"K-283", NID_sect283k1},
{"K-409", NID_sect409k1},
{"K-571", NID_sect571k1},
{"P-192", NID_X9_62_prime192v1},
{"P-224", NID_secp224r1},
{"P-256", NID_X9_62_prime256v1},
{"P-384", NID_secp384r1},
{"P-521", NID_secp521r1}
};
const char *EC_curve_nid2nist(int nid)
{
size_t i;
for (i = 0; i < sizeof(nist_curves)/sizeof(EC_NIST_NAME); i++)
{
if (nist_curves[i].nid == nid)
return nist_curves[i].name;
}
return NULL;
}
int EC_curve_nist2nid(const char *name)
{
size_t i;
for (i = 0; i < sizeof(nist_curves)/sizeof(EC_NIST_NAME); i++)
{
if (!strcmp(nist_curves[i].name, name))
return nist_curves[i].nid;
}
return NID_undef;
}