Adding the secp256k1 curve for ECDSA

[NIIBE Yutaka]

On 2014-01-14 at 21:54 +0900, NIIBE Yutaka wrote:
> I added support of the secp256k1 curve in libgcrypt.  Next, I'd like
> to add a feature of ECDSA with secp256k1 to GnuPG.

As a start, I add OID of secp256k1 and add an entry for --gen-key.

Here it is.  OK to push to master?

diff --git a/common/openpgp-oid.c b/common/openpgp-oid.c
index 05b1a40..28567b7 100644
--- a/common/openpgp-oid.c
+++ b/common/openpgp-oid.c
@@ -310,6 +310,11 @@ openpgp_curve_to_oid (const char *name, unsigned int *r_nbits)
       oidstr =  "1.3.36.3.3.2.8.1.1.13";
       nbits = 512;
     }
+  else if (!strcmp (name, "secp256k1"))
+    {
+      oidstr =  "1.3.132.0.10";
+      nbits = 256;
+    }
   else
     oidstr = NULL;
 
@@ -333,6 +338,8 @@ openpgp_oid_to_curve (const char *oid)
     name = "Ed25519";
   else if (!strcmp (oid, "1.2.840.10045.3.1.7"))
     name = "nistp256";
+  else if (!strcmp (oid, "1.3.132.0.10"))
+    name = "secp256k1";
   else if (!strcmp (oid, "1.3.132.0.34"))
     name = "nistp384";
   else if (!strcmp (oid, "1.3.132.0.35"))
diff --git a/g10/keygen.c b/g10/keygen.c
index 4bb8bba..7582b0b 100644
--- a/g10/keygen.c
+++ b/g10/keygen.c
@@ -2062,6 +2062,7 @@ ask_curve (void)
     { "brainpoolP256r1", 0, 1, "Brainpool P-256" },
     { "brainpoolP384r1", 0, 1, "Brainpool P-384" },
     { "brainpoolP512r1", 0, 1, "Brainpool P-512" },
+    { "secp256k1", 0, 1 },
   };
   int idx;
   char *answer;
--