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+README.apichanges 2003-07-28
+
+  NOTE: THESE ARE API CHANGES DONE BEFORE THE FIRST STABLE RELEASE SO
+  THEY ARE NOT RELEVANT ANYMORE [stable is 1.2.4 right now]
+
+We decided to change a couple of annoying things in Libgcrypt and to
+cleanup the API.  The new API better fits into a multi-threaded
+environment and is more consistent.  One import change is that all
+functions return error codes from a set of error codes shared between
+GnuPG, GPGME and Libgcrypt.
+
+This file contains some hints on how to port your application from
+libgcrypt <= 1.1.12 to the current API as of 1.1.42.  We hope that
+there won't be another need for such a major change.
+
+
+* Types
+
+  All types definitions changed to a foo_t scheme; for some time we
+  will support the old names but you better start to rename them:
+
+  s/GCRY_MPI/gcry_mpi_t/
+  s/GcryMPI/gcry_mpi_t/
+  s/GCRY_SEXP/gcry_sexp_t/
+  s/GcrySexp/gcry_sexp_t/
+  s/GCRY_CIPHER_HD/gcry_cipher_hd_t/
+  s/GcryCipherHd/gcry_cipher_hd_t/
+  s/GCRY_MD_HD/gcry_md_hd_t/
+  s/GcryMDHd/gcry_md_hd_t/
+
+* Initialization
+
+  For proper initialization of the library, you must call
+  gcry_check_version() before calling any other function except for
+  these gcry_control operations:
+     GCRYCTL_SUSPEND_SECMEM_WARN
+     GCRYCTL_DISABLE_INTERNAL_LOCKING
+     GCRYCTL_ANY_INITIALIZATION_P
+     GCRYCTL_INITIALIZATION_FINISHED_P
+
+
+* Handles
+
+  gcry_cipher_open and gcry_md_open do now return an error code
+  instead of a NULL handle; the handle is now returned by
+  asigning it to the first argument.  Example on how to change your
+  code:
+
+  Old:
+
+    hd = gcry_md_open (algo, flags);
+    if (!hd)
+      {
+         fprintf (stderr, "md_open failed: %s\n", gcry_errno (-1));
+         ....
+
+  New:
+
+    rc = gcry_md_open (&hd, algo, flags);
+    if (rc)
+      {
+         fprintf (stderr, "md_open failed: %s\n", gcry_strerror (rc));
+         ....
+
+  If you are not interested in the error code, you can do it in a
+  simplified way:
+ 
+    gcry_md_open (&hd, algo, flags);
+    if (!hd)
+        abort ();
+
+  i.e. the function makes sure that HD points to NULL in case of an error.
+  The required change for gcry_cipher_open is similar.
+
+* Message Digests
+
+  The order of the arguments to gcry_md_copy has been changed in order
+  to be more consistent with other functions of this type.  This means
+  that the new message digest handle will be a copy of the message
+  handle specified by the second argument and stored at the address
+  pointed to by the first argument.
+
+* Error codes
+
+  gcry_errno () has been removed because it is hard to use in
+  multi-threaded environment.  You need to save the error code
+  returned by the functions and use it either numerical or passing it
+  to gcry_strerror (since gcry_strerror is a wrapper function for
+  gpg_strerror, the latter function can also be used).
+
+  Instead of using the error codes GCRYERR_*, you have to use the
+  GPG_ERR_* names. 
+
+* S-expressions
+
+  gcry_sexp_canon_len used to return a `historical' error code in
+  `errcode', this is not the case anymore; the value returned in
+  `errcode' is now a standard Libgcrypt (i.e. gpg-error) error code.
+
+* MPI
+
+  gcry_mpi_scan and gcry_mpi_print need the size of a provided buffer
+  as input and return the number of bytes actually scanned/printed to
+  the user.  The old API used a single size_t Pointer for both tasks,
+  the new API distinguishes between the input and the output values.
+
+* Public Key cryptography
+
+  gcry_pk_decrypt used to return a `simple S-expression part' that
+  contains a single MPI value.  In case the `data' S-expression
+  contains a `flags' element, the result S-expression is filled with a
+  complete S-expression of the following format:
+
+    (value PLAINTEXT)
+