X-Git-Url: https://www.bearssl.org/gitweb//home/git/?p=BearSSL;a=blobdiff_plain;f=inc%2Fbearssl_hash.h;h=860ab718b3a50f6e2ffc4f774214fe88d5ca436a;hp=524ac0145d7652dbe7d4444afdb6ccb8e1f87c57;hb=af9c79a0710a45361f9ae4313f8bb5bf738c3b7a;hpb=5f045c759957fdff8c85716e6af99e10901fdac0

diff --git a/inc/bearssl_hash.h b/inc/bearssl_hash.h
index 524ac01..860ab71 100644
--- a/inc/bearssl_hash.h
+++ b/inc/bearssl_hash.h
@@ -29,6 +29,10 @@
 #include <stdint.h>
 #include <string.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** \file bearssl_hash.h
  *
  * # Hash Functions
@@ -1309,4 +1313,34 @@ void br_ghash_pclmul(void *y, const void *h, const void *data, size_t len);
  */
 br_ghash br_ghash_pclmul_get(void);
 
+/**
+ * \brief GHASH implementation using the POWER8 opcodes.
+ *
+ * This implementation is available only on POWER8 platforms (and later).
+ * To safely obtain a pointer to this function when supported (or 0
+ * otherwise), use `br_ghash_pwr8_get()`.
+ *
+ * \param y      the array to update.
+ * \param h      the GHASH key.
+ * \param data   the input data (may be `NULL` if `len` is zero).
+ * \param len    the input data length (in bytes).
+ */
+void br_ghash_pwr8(void *y, const void *h, const void *data, size_t len);
+
+/**
+ * \brief Obtain the `pwr8` GHASH implementation, if available.
+ *
+ * If the `pwr8` implementation was compiled in the library (depending
+ * on the compiler abilities) _and_ the local CPU appears to support the
+ * opcode, then this function will return a pointer to the
+ * `br_ghash_pwr8()` function. Otherwise, it will return `0`.
+ *
+ * \return  the `pwr8` GHASH implementation, or `0`.
+ */
+br_ghash br_ghash_pwr8_get(void);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif