tools 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.

Fixes: 6e8ccb4f624a73c5 ("tools/bpf: properly account for libbfd variations")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: KP Singh <kpsingh@kernel.org>
Cc: llvm@lists.linux.dev
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Nick Terrell <terrelln@fb.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Monnet <quentin@isovalent.com>
Cc: Song Liu <song@kernel.org>
Cc: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220719170555.2576993-4-roberto.sassu@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/build/feature/test-libcrypto.c b/tools/build/feature/test-libcrypto.c
index a98174e..bc34a5b 100644 (file)
--- 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]);