sim: add EC256 encryption key

Signed-off-by: Fabio Utzig <utzig@apache.org>

Author: utzig

enc-ec256-priv.pem

@@ -0,0 +1,5 @@
+-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg9h5Rnfj63aG32alk
+ZDtU0D3QH+V42ReYpSjKzGtnngahRANCAASKRHMAlMmAJzENIzZr6Wmfy8V8yEQa
+k+bufYamrl6TcnTZ4Vocm2UaK2FBKAJzhBKXOi2ioGd3AtpnGkvd13HM
+-----END PRIVATE KEY-----

enc-ec256-pub.pem

@@ -0,0 +1,4 @@
+-----BEGIN PUBLIC KEY-----
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEikRzAJTJgCcxDSM2a+lpn8vFfMhE
+GpPm7n2Gpq5ek3J02eFaHJtlGithQSgCc4QSlzotoqBndwLaZxpL3ddxzA==
+-----END PUBLIC KEY-----

sim/mcuboot-sys/csupport/keys.c

@@ -266,3 +266,25 @@ const struct bootutil_key bootutil_enc_key = {
     .len = &enc_key_len,
 };
 #endif
+
+#if defined(MCUBOOT_ENCRYPT_EC256)
+unsigned char enc_key[] = {
+  0x30, 0x81, 0x87, 0x02, 0x01, 0x00, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86,
+  0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d,
+  0x03, 0x01, 0x07, 0x04, 0x6d, 0x30, 0x6b, 0x02, 0x01, 0x01, 0x04, 0x20,
+  0xf6, 0x1e, 0x51, 0x9d, 0xf8, 0xfa, 0xdd, 0xa1, 0xb7, 0xd9, 0xa9, 0x64,
+  0x64, 0x3b, 0x54, 0xd0, 0x3d, 0xd0, 0x1f, 0xe5, 0x78, 0xd9, 0x17, 0x98,
+  0xa5, 0x28, 0xca, 0xcc, 0x6b, 0x67, 0x9e, 0x06, 0xa1, 0x44, 0x03, 0x42,
+  0x00, 0x04, 0x8a, 0x44, 0x73, 0x00, 0x94, 0xc9, 0x80, 0x27, 0x31, 0x0d,
+  0x23, 0x36, 0x6b, 0xe9, 0x69, 0x9f, 0xcb, 0xc5, 0x7c, 0xc8, 0x44, 0x1a,
+  0x93, 0xe6, 0xee, 0x7d, 0x86, 0xa6, 0xae, 0x5e, 0x93, 0x72, 0x74, 0xd9,
+  0xe1, 0x5a, 0x1c, 0x9b, 0x65, 0x1a, 0x2b, 0x61, 0x41, 0x28, 0x02, 0x73,
+  0x84, 0x12, 0x97, 0x3a, 0x2d, 0xa2, 0xa0, 0x67, 0x77, 0x02, 0xda, 0x67,
+  0x1a, 0x4b, 0xdd, 0xd7, 0x71, 0xcc,
+};
+static unsigned int enc_key_len = 138;
+const struct bootutil_key bootutil_enc_key = {
+    .key = enc_key,
+    .len = &enc_key_len,
+};
+#endif