Deprecate the low level MDC2 functions.

[openssl.git] / doc / man3 / MDC2_Init.pod

diff --git a/doc/man3/MDC2_Init.pod b/doc/man3/MDC2_Init.pod
index 4ffbf931c09cfffb96f11b89571e96c6d6fdf0a0..1427759d3f8e7e09cd40aa40fdc51d6fc0e18ccb 100644 (file)
--- a/doc/man3/MDC2_Init.pod
+++ b/doc/man3/MDC2_Init.pod
@@ -8,6 +8,10 @@ MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function
 
  #include <openssl/mdc2.h>
 
+Deprecated since OpenSSL 3.0, can be hidden entirely by defining
+B<OPENSSL_API_COMPAT> with a suitable version value, see
+L<openssl_user_macros(7)>:
+
  unsigned char *MDC2(const unsigned char *d, unsigned long n,
                      unsigned char *md);
 
@@ -18,6 +22,10 @@ MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function
 
 =head1 DESCRIPTION
 
+All of the functions described on this page are deprecated.
+Applications should instead use L<EVP_DigestInit_ex(3)>, L<EVP_DigestUpdate(3)>
+and L<EVP_DigestFinal_ex(3)>.
+
 MDC2 is a method to construct hash functions with 128 bit output from
 block ciphers.  These functions are an implementation of MDC2 with
 DES.
@@ -56,6 +64,10 @@ ISO/IEC 10118-2:2000 Hash-Function 2, with DES as the underlying block cipher.
 
 L<EVP_DigestInit(3)>
 
+=head1 HISTORY
+
+All of these functions were deprecated in OpenSSL 3.0.
+
 =head1 COPYRIGHT
 
 Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.