[Python-checkins] closes bpo-39621: Make buf arg to md5_compress be const. (GH-18497)

[Andy Lester]

https://github.com/python/cpython/commit/597ebed748d0b0c061f8c108bd98270d103286c1
commit: 597ebed748d0b0c061f8c108bd98270d103286c1
branch: master
author: Andy Lester <andy at petdance.com>
committer: GitHub <noreply at github.com>
date: 2020-02-12T20:53:01-08:00
summary:

closes bpo-39621: Make buf arg to md5_compress be const. (GH-18497)

files:
M Modules/md5module.c

diff --git a/Modules/md5module.c b/Modules/md5module.c
index d783ae5a765fa..ea2bafb9b65e8 100644
--- a/Modules/md5module.c
+++ b/Modules/md5module.c
@@ -119,7 +119,7 @@ typedef struct {
     a = (a + I(b,c,d) + M + t); a = ROLc(a, s) + b;
 
 
-static void md5_compress(struct md5_state *md5, unsigned char *buf)
+static void md5_compress(struct md5_state *md5, const unsigned char *buf)
 {
     MD5_INT32 i, W[16], a, b, c, d;
 
@@ -242,7 +242,7 @@ md5_process(struct md5_state *md5, const unsigned char *in, Py_ssize_t inlen)
 
     while (inlen > 0) {
         if (md5->curlen == 0 && inlen >= MD5_BLOCKSIZE) {
-           md5_compress(md5, (unsigned char *)in);
+           md5_compress(md5, in);
            md5->length    += MD5_BLOCKSIZE * 8;
            in             += MD5_BLOCKSIZE;
            inlen          -= MD5_BLOCKSIZE;