Index: mailsend-1.17b15/utils.c
===================================================================
--- mailsend-1.17b15.orig/utils.c	2014-05-26 02:24:43.000000000 +0800
+++ mailsend-1.17b15/utils.c	2020-02-07 12:01:36.906823900 +0800
@@ -791,8 +791,13 @@
     unsigned char
         hmac_md5[16];
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
     HMAC_CTX
         ctx;
+#else
+    HMAC_CTX
+        *ctx;
+#endif
 
     const EVP_MD
         *md5=NULL;
@@ -831,11 +836,18 @@
     showVerbose("Challenge After decoding: %s\n",data);
 
     /* take HMAC-MD5 of the challenge*/
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
     md5=EVP_get_digestbyname("md5");
     HMAC_CTX_init(&ctx);
     HMAC_Init(&ctx,secret,strlen(secret),md5);
     HMAC_Update(&ctx,data,data_len);
     HMAC_Final(&ctx,hmac_md5,&hmac_len);
+#else
+    ctx = HMAC_CTX_new();
+    HMAC_Init_ex(ctx,secret,strlen(secret),EVP_md5(),NULL);
+    HMAC_Update(ctx,data,data_len);
+    HMAC_Final(ctx,hmac_md5,&hmac_len);
+#endif
 
     /* convert the digest to hex */
     memset(hex,0,sizeof(hex));