linux-kernel - [PATCH 4/4] build: Switch to new openssl API for test-libcrypto

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Message-ID: <20220719170555.2576993-4-roberto.sassu@huawei.com>
Date:   Tue, 19 Jul 2022 19:05:55 +0200
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     <quentin@...valent.com>, <ast@...nel.org>, <daniel@...earbox.net>,
        <andrii@...nel.org>, <martin.lau@...ux.dev>, <song@...nel.org>,
        <john.fastabend@...il.com>, <kpsingh@...nel.org>, <sdf@...gle.com>,
        <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <terrelln@...com>, <nathan@...nel.org>, <ndesaulniers@...gle.com>
CC:     <bpf@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
        <llvm@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: [PATCH 4/4] build: Switch to new openssl API for test-libcrypto

Switch to new EVP API for detecting libcrypto, as Fedora 36 returns an
error when it encounters the deprecated function MD5_Init() and the others.
The error would be interpreted as missing libcrypto, while in reality it is
not.

Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
 tools/build/feature/test-libcrypto.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/tools/build/feature/test-libcrypto.c b/tools/build/feature/test-libcrypto.c
index a98174e0569c..bc34a5bbb504 100644
--- a/tools/build/feature/test-libcrypto.c
+++ b/tools/build/feature/test-libcrypto.c
@@ -1,16 +1,23 @@
 // SPDX-License-Identifier: GPL-2.0
+#include <openssl/evp.h>
 #include <openssl/sha.h>
 #include <openssl/md5.h>
 
 int main(void)
 {
-	MD5_CTX context;
+	EVP_MD_CTX *mdctx;
 	unsigned char md[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
 	unsigned char dat[] = "12345";
+	unsigned int digest_len;
 
-	MD5_Init(&context);
-	MD5_Update(&context, &dat[0], sizeof(dat));
-	MD5_Final(&md[0], &context);
+	mdctx = EVP_MD_CTX_new();
+	if (!mdctx)
+		return 0;
+
+	EVP_DigestInit_ex(mdctx, EVP_md5(), NULL);
+	EVP_DigestUpdate(mdctx, &dat[0], sizeof(dat));
+	EVP_DigestFinal_ex(mdctx, &md[0], &digest_len);
+	EVP_MD_CTX_free(mdctx);
 
 	SHA1(&dat[0], sizeof(dat), &md[0]);
 
-- 
2.25.1