Add new APIs EC_curve_nist2nid and EC_curve_nid2nist which convert

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)

CHANGES

@@ -4,6 +4,11 @@
 
  Changes between 1.0.1 and 1.0.2 [xx XXX xxxx]
 
+  *) Add new APIs EC_curve_nist2nid and EC_curve_nid2nist which convert
+     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.
+     [Steve Henson]
+
   *) Enhance SSL/TLS certificate chain handling to support different
      chains for each certificate instead of one chain in the parent SSL_CTX.
      [Steve Henson]

apps/ecparam.c

@@ -402,6 +402,9 @@ bad:
 			}
 		else
 			nid = OBJ_sn2nid(curve_name);
+
+		if (nid == 0)
+			nid = EC_curve_nist2nid(curve_name);
 	
 		if (nid == 0)
 			{

crypto/ec/ec.h

@@ -396,6 +396,8 @@ typedef struct {
  * are filled with the data of the first nitems internal groups */
 size_t EC_get_builtin_curves(EC_builtin_curve *r, size_t nitems);
 
+const char *EC_curve_nid2nist(int nid);
+int EC_curve_nist2nid(const char *name);
 
 /********************************************************************/
 /*                    EC_POINT functions                            */

crypto/ec/ec_curve.c

@@ -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;
+	}
+

crypto/ec/ec_pmeth.c

@@ -252,7 +252,9 @@ static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
 	if (!strcmp(type, "ec_paramgen_curve"))
 		{
 		int nid;
-		nid = OBJ_sn2nid(value);
+		nid = EC_curve_nist2nid(value);
+		if (nid == NID_undef)
+			nid = OBJ_sn2nid(value);
 		if (nid == NID_undef)
 			nid = OBJ_ln2nid(value);
 		if (nid == NID_undef)

crypto/ec/eck_prn.c

@@ -177,6 +177,7 @@ int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off)
 		{
 		/* the curve parameter are given by an asn1 OID */
 		int nid;
+		const char *nname;
 
 		if (!BIO_indent(bp, off, 128))
 			goto err;
@@ -184,11 +185,18 @@ int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off)
 		nid = EC_GROUP_get_curve_name(x);
 		if (nid == 0)
 			goto err;
-
 		if (BIO_printf(bp, "ASN1 OID: %s", OBJ_nid2sn(nid)) <= 0)
 			goto err;
 		if (BIO_printf(bp, "\n") <= 0)
 			goto err;
+		nname = EC_curve_nid2nist(nid);
+		if (nname)
+			{
+			if (!BIO_indent(bp, off, 128))
+				goto err;
+			if (BIO_printf(bp, "NIST CURVE: %s\n", nname) <= 0)
+				goto err;
+			}
 		}
 	else
 		{