Add MBEDTLS_ERR_ECP_IN_PROGRESS
diff --git a/include/mbedtls/ecp.h b/include/mbedtls/ecp.h
index 944b7f8..f821690 100644
--- a/include/mbedtls/ecp.h
+++ b/include/mbedtls/ecp.h
@@ -36,6 +36,7 @@
#define MBEDTLS_ERR_ECP_RANDOM_FAILED -0x4D00 /**< Generation of random value, such as (ephemeral) key, failed. */
#define MBEDTLS_ERR_ECP_INVALID_KEY -0x4C80 /**< Invalid private or public key. */
#define MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH -0x4C00 /**< Signature is valid but shorter than the user-supplied length. */
+#define MBEDTLS_ERR_ECP_IN_PROGRESS -0x4B80 /**< Operation in progress, try again with the same parameters. */
#if !defined(MBEDTLS_ECP_ALT)
/*