1 files changed, 45 insertions, 0 deletions
diff --git a/sysdeps/s390/s390-64/chacha20_arch.h b/sysdeps/s390/s390-64/chacha20_arch.h
new file mode 100644
index 0000000000..0c6abf77e8
--- /dev/null
+++ b/sysdeps/s390/s390-64/chacha20_arch.h
@@ -0,0 +1,45 @@
+/* s390x optimization for ChaCha20.VE_S390_VX_ASM_SUPPORT
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdbool.h>
+#include <ldsodefs.h>
+#include <sys/auxv.h>
+
+unsigned int __chacha20_s390x_vx_blocks8 (uint32_t *state, uint8_t *dst,
+					  const uint8_t *src, size_t nblks)
+     attribute_hidden;
+
+static inline void
+chacha20_crypt (uint32_t *state, uint8_t *dst, const uint8_t *src,
+		size_t bytes)
+{
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+  _Static_assert (CHACHA20_BUFSIZE % 8 == 0,
+		  "CHACHA20_BUFSIZE not multiple of 8");
+  _Static_assert (CHACHA20_BUFSIZE >= CHACHA20_BLOCK_SIZE * 8,
+		  "CHACHA20_BUFSIZE < CHACHA20_BLOCK_SIZE * 8");
+
+  if (GLRO(dl_hwcap) & HWCAP_S390_VX)
+    {
+      __chacha20_s390x_vx_blocks8 (state, dst, src,
+				   CHACHA20_BUFSIZE / CHACHA20_BLOCK_SIZE);
+      return;
+    }
+#endif
+  chacha20_crypt_generic (state, dst, src, bytes);
+}