rsaenh: Constify some variables

[Andrew Talbot]

Changelog:
    rsaenh: Constify some variables.

diff -urN a/dlls/rsaenh/implglue.c b/dlls/rsaenh/implglue.c
--- a/dlls/rsaenh/implglue.c	2006-11-14 11:15:46.000000000 +0000
+++ b/dlls/rsaenh/implglue.c	2007-08-23 20:20:39.000000000 +0100
@@ -328,7 +328,7 @@
     return SystemFunction036(pbBuffer, dwLen);
 }
 
-BOOL export_public_key_impl(BYTE *pbDest, KEY_CONTEXT *pKeyContext, DWORD dwKeyLen,DWORD *pdwPubExp)
+BOOL export_public_key_impl(BYTE *pbDest, const KEY_CONTEXT *pKeyContext, DWORD dwKeyLen,DWORD *pdwPubExp)
 {
     mp_to_unsigned_bin(&pKeyContext->rsa.N, pbDest);
     reverse_bytes(pbDest, dwKeyLen);
@@ -362,7 +362,7 @@
     return TRUE;    
 }
 
-BOOL export_private_key_impl(BYTE *pbDest, KEY_CONTEXT *pKeyContext, DWORD dwKeyLen, 
+BOOL export_private_key_impl(BYTE *pbDest, const KEY_CONTEXT *pKeyContext, DWORD dwKeyLen, 
                              DWORD *pdwPubExp)
 {
     mp_to_unsigned_bin(&pKeyContext->rsa.N, pbDest);
diff -urN a/dlls/rsaenh/implglue.h b/dlls/rsaenh/implglue.h
--- a/dlls/rsaenh/implglue.h	2006-09-29 15:47:00.000000000 +0100
+++ b/dlls/rsaenh/implglue.h	2007-08-23 20:20:49.000000000 +0100
@@ -86,11 +86,11 @@
                         DWORD enc);
 BOOL encrypt_stream_impl(ALG_ID aiAlgid, KEY_CONTEXT *pKeyContext, BYTE *pbInOut, DWORD dwLen);
 
-BOOL export_public_key_impl(BYTE *pbDest, KEY_CONTEXT *pKeyContext, DWORD dwKeyLen, 
+BOOL export_public_key_impl(BYTE *pbDest, const KEY_CONTEXT *pKeyContext, DWORD dwKeyLen, 
                             DWORD *pdwPubExp);
 BOOL import_public_key_impl(CONST BYTE *pbSrc, KEY_CONTEXT *pKeyContext, DWORD dwKeyLen, 
                             DWORD dwPubExp);
-BOOL export_private_key_impl(BYTE *pbDest, KEY_CONTEXT *pKeyContext, DWORD dwKeyLen, 
+BOOL export_private_key_impl(BYTE *pbDest, const KEY_CONTEXT *pKeyContext, DWORD dwKeyLen, 
                              DWORD *pdwPubExp);
 BOOL import_private_key_impl(CONST BYTE* pbSrc, KEY_CONTEXT *pKeyContext, DWORD dwKeyLen, 
                              DWORD dwPubExp);
diff -urN a/dlls/rsaenh/rsaenh.c b/dlls/rsaenh/rsaenh.c
--- a/dlls/rsaenh/rsaenh.c	2007-07-11 17:34:07.000000000 +0100
+++ b/dlls/rsaenh/rsaenh.c	2007-08-23 20:21:09.000000000 +0100
@@ -521,7 +521,7 @@
  * NOTES
  *  See Internet RFC 2104 for details on the HMAC algorithm.
  */
-static BOOL copy_hmac_info(PHMAC_INFO *dst, PHMAC_INFO src) {
+static BOOL copy_hmac_info(PHMAC_INFO *dst, const HMAC_INFO *src) {
     if (!src) return FALSE;
     *dst = HeapAlloc(GetProcessHeap(), 0, sizeof(HMAC_INFO));
     if (!*dst) return FALSE;
@@ -974,7 +974,7 @@
  *  Success: Handle to the new key container.
  *  Failure: INVALID_HANDLE_VALUE
  */
-static HCRYPTPROV new_key_container(PCCH pszContainerName, DWORD dwFlags, PVTableProvStruc pVTable)
+static HCRYPTPROV new_key_container(PCCH pszContainerName, DWORD dwFlags, const VTableProvStruc *pVTable)
 {
     KEYCONTAINER *pKeyContainer;
     HCRYPTPROV hKeyContainer;
@@ -1039,7 +1039,7 @@
  *  Success: Handle to the key container read from the registry
  *  Failure: INVALID_HANDLE_VALUE
  */
-static HCRYPTPROV read_key_container(PCHAR pszContainerName, DWORD dwFlags, PVTableProvStruc pVTable)
+static HCRYPTPROV read_key_container(PCHAR pszContainerName, DWORD dwFlags, const VTableProvStruc *pVTable)
 {
     CHAR szRSABase[MAX_PATH];
     BYTE *pbKey;