--- ptpd-ptpd-2.3.1/src/dep/ntpengine/ntp_isc_md5.h	2022-06-13 12:06:41.011511173 +0200
+++ ptpd-ptpd-2.3.1/src/dep/ntpengine/ntp_isc_md5.h	2022-06-13 12:10:22.114199482 +0200
@@ -55,6 +55,10 @@
 #include <strings.h>
 #endif /* HAVE_STRINGS_H */
 
+#include <openssl/ossl_typ.h>
+#include <openssl/evp.h>
+#include <openssl/md5.h>
+
 #define ISC_MD5_DIGESTLENGTH 16U
 
 
@@ -78,11 +78,11 @@ isc_md5_update(isc_md5_t *ctx, const uns
 void
 isc_md5_final(isc_md5_t *ctx, unsigned char *digest);
 
-  typedef isc_md5_t             MD5_CTX;
+//  typedef isc_md5_t             MD5_CTX;
 # define MD5Init(c)             isc_md5_init(c)
 # define MD5Update(c, p, s)     isc_md5_update(c, p, s)
 # define MD5Final(d, c)         isc_md5_final((c), (d)) /* swapped */
-  typedef MD5_CTX                       EVP_MD_CTX;
+//  typedef MD5_CTX                       EVP_MD_CTX;
 # define EVP_DigestInit(c)              MD5Init(c)
 # define EVP_DigestUpdate(c, p, s)      MD5Update(c, p, s)
 # define EVP_DigestFinal(c, d, pdl)     \
--- ptpd-ptpd-2.3.1/src/dep/ntpengine/ntp_isc_md5.c	2015-06-29 17:13:29.000000000 +0200
+++ ptpd-ptpd-2.3.1/src/dep/ntpengine/ntp_isc_md5.c	2022-06-13 12:39:24.593386704 +0200
@@ -262,12 +262,13 @@ MD5authencrypt(
 {
 	u_char	digest[64];
 	u_int	len;
-	EVP_MD_CTX ctx;
+	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
         pkt[length / 4] = htonl(keyid); 
-	EVP_DigestInit(&ctx);
-	EVP_DigestUpdate(&ctx, (u_char *)key, (u_int)strlen(key));
-	EVP_DigestUpdate(&ctx, (u_char *)pkt, (u_int)length);
-	EVP_DigestFinal(&ctx, digest, &len);
+	EVP_DigestInit(ctx);
+	EVP_DigestUpdate(ctx, (u_char *)key, (u_int)strlen(key));
+	EVP_DigestUpdate(ctx, (u_char *)pkt, (u_int)length);
+	EVP_DigestFinal(ctx, digest, &len);
+	EVP_MD_CTX_free(ctx);
 	memmove((u_char *)pkt + length + 4, digest, len);
 	return (len + 4);
 }