Embedded chacha: Remove some harmless dead stores in keystream mode

(From r338059.) Sponsored by: Dell EMC Isilon
svn path=/head/; revision=339500
2018-10-20 22:17:16 +00:00 · 2018-10-20 22:17:16 +00:00 · 987733eddf · 2020-12-20 02:59:44 +00:00
commit 987733eddf
parent 243e09430a
1 changed files with 2 additions and 0 deletions
--- a/sys/crypto/chacha20/chacha.c
+++ b/sys/crypto/chacha20/chacha.c
@ -120,8 +120,10 @@ chacha_encrypt_bytes(chacha_ctx *x,const u8 *m,u8 *c,u32 bytes)

  for (;;) {
    if (bytes < 64) {
+#ifndef KEYSTREAM_ONLY
      for (i = 0;i < bytes;++i) tmp[i] = m[i];
      m = tmp;
+#endif
      ctarget = c;
      c = tmp;
    }