commit ab0f71a22ae8b73e32b909f52f923b5114b5540a
author Janos Follath <janos.follath@arm.com> Wed Feb 20 10:48:49 2019 +0000
committer Janos Follath <janos.follath@arm.com> Fri Feb 22 15:42:03 2019 +0000
tree 7b75f553c244bda0db7b611b9c1a068125992ac0
parent e344d0f6fc8fab4097e9340a5bd3dddcfa2475ab

ECDH: Add test vectors for Curve25519

The test vectors added are published in RFC 7748.

library/ecdh.c

diff --git a/library/ecdh.c b/library/ecdh.c
index c572687..30c5f9f 100644
--- a/library/ecdh.c
+++ b/library/ecdh.c
@@ -637,6 +637,10 @@
         return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
 
     *olen = ctx->grp.pbits / 8 + ( ( ctx->grp.pbits % 8 ) != 0 );
+
+    if( ctx->grp.id == MBEDTLS_ECP_DP_CURVE25519 )
+        return mbedtls_mpi_write_binary_le( &ctx->z, buf, *olen );
+
     return mbedtls_mpi_write_binary( &ctx->z, buf, *olen );
 }