1 files changed, 8 insertions, 0 deletions
diff --git a/crypto/include/internal/ec_int.h b/crypto/include/internal/ec_int.h
index bb4b5129d001..182c39cc8056 100644
--- a/crypto/include/internal/ec_int.h
+++ b/crypto/include/internal/ec_int.h
@@ -41,5 +41,13 @@
 __owur int ec_group_do_inverse_ord(const EC_GROUP *group, BIGNUM *res,
                                    const BIGNUM *x, BN_CTX *ctx);
 
+/*-
+ * ECDH Key Derivation Function as defined in ANSI X9.63
+ */
+int ecdh_KDF_X9_63(unsigned char *out, size_t outlen,
+                   const unsigned char *Z, size_t Zlen,
+                   const unsigned char *sinfo, size_t sinfolen,
+                   const EVP_MD *md);
+
 # endif /* OPENSSL_NO_EC */
 #endif