> EVP_MD_CTX_create() and EVP_MD_CTX_destroy() were renamed to

> EVP_MD_CTX_new() and EVP_MD_CTX_free() in OpenSSL 1.1.

This patch permits compilation on RHEL7 systems (that have
OpenSSL tagged as 1.0)

cache.c

@@ -45,12 +45,20 @@ static unsigned int sha_hash(const char *data, size_t size, unsigned char *out)
  const EVP_MD *md = EVP_get_digestbyname("SHA1");
 
  if (md != NULL) {
+#if OPENSSL_VERSION_NUMBER < 0x10100000
+ EVP_MD_CTX *mdctx = EVP_MD_CTX_create();
+#else
  EVP_MD_CTX *mdctx = EVP_MD_CTX_new();
+#endif
  EVP_MD_CTX_init(mdctx);
  EVP_DigestInit_ex(mdctx, md, NULL);
  EVP_DigestUpdate(mdctx, data, size);
  EVP_DigestFinal_ex(mdctx, out, &md_len);
+#if OPENSSL_VERSION_NUMBER < 0x10100000
+ EVP_MD_CTX_destroy(mdctx);
+#else
  EVP_MD_CTX_free(mdctx);
+#endif
  }
  return md_len;
 }