chacha_enc.c: fix for EBCDIC platforms

Signed-off-by: Joerg Schmidbauer <jschmidb@de.ibm.com>

Reviewed-by: Patrick Steuer <patrick.steuer@de.ibm.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10417)

1 files changed, 13 insertions, 4 deletions

diff --git a/crypto/chacha/chacha_enc.c b/crypto/chacha/chacha_enc.c
index 05a716b5d4..3cf5facd5e 100644
--- a/crypto/chacha/chacha_enc.c
+++ b/crypto/chacha/chacha_enc.c
@@ -12,6 +12,7 @@
 #include <string.h>
 
 #include "crypto/chacha.h"
+#include "crypto/ctype.h"
 
 typedef unsigned int u32;
 typedef unsigned char u8;
@@ -78,10 +79,18 @@ void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp,
     size_t todo, i;
 
     /* sigma constant "expand 32-byte k" in little-endian encoding */
-    input[0] = ((u32)'e') | ((u32)'x'<<8) | ((u32)'p'<<16) | ((u32)'a'<<24);
-    input[1] = ((u32)'n') | ((u32)'d'<<8) | ((u32)' '<<16) | ((u32)'3'<<24);
-    input[2] = ((u32)'2') | ((u32)'-'<<8) | ((u32)'b'<<16) | ((u32)'y'<<24);
-    input[3] = ((u32)'t') | ((u32)'e'<<8) | ((u32)' '<<16) | ((u32)'k'<<24);
+    input[0] = ((u32)ossl_toascii('e')) | ((u32)ossl_toascii('x') << 8)
+               | ((u32)ossl_toascii('p') << 16)
+               | ((u32)ossl_toascii('a') << 24);
+    input[1] = ((u32)ossl_toascii('n')) | ((u32)ossl_toascii('d') << 8)
+               | ((u32)ossl_toascii(' ') << 16)
+               | ((u32)ossl_toascii('3') << 24);
+    input[2] = ((u32)ossl_toascii('2')) | ((u32)ossl_toascii('-') << 8)
+               | ((u32)ossl_toascii('b') << 16)
+               | ((u32)ossl_toascii('y') << 24);
+    input[3] = ((u32)ossl_toascii('t')) | ((u32)ossl_toascii('e') << 8)
+               | ((u32)ossl_toascii(' ') << 16)
+               | ((u32)ossl_toascii('k') << 24);
 
     input[4] = key[0];
     input[5] = key[1];