New EC functions.

New functions EC_POINT_point2buf and EC_KEY_key2buf which encode
a point and allocate a buffer in one call.

New function EC_KEY_oct2key() which sets public key in an EC_KEY
structure from an encoded point.

Reviewed-by: Richard Levitte <levitte@openssl.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/crypto/ec/ec_oct.c b/crypto/ec/ec_oct.c
index 040c414a33..fca50dc6bf 100644
--- a/crypto/ec/ec_oct.c
+++ b/crypto/ec/ec_oct.c
@@ -190,3 +190,24 @@ int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
     }
     return group->meth->oct2point(group, point, buf, len, ctx);
 }
+
+size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
+                          point_conversion_form_t form,
+                          unsigned char **pbuf, BN_CTX *ctx)
+{
+    size_t len;
+    unsigned char *buf;
+    len = EC_POINT_point2oct(group, point, form, NULL, 0, NULL);
+    if (len == 0)
+        return 0;
+    buf = OPENSSL_malloc(len);
+    if (buf == NULL)
+        return 0;
+    len = EC_POINT_point2oct(group, point, form, buf, len, ctx);
+    if (len == 0) {
+        OPENSSL_free(buf);
+        return 0;
+    }
+    *pbuf = buf;
+    return len;
+}