[PATCH 1/1] rsaenh: Return an error on zero length only when decrypting the final block.

[Hans Leidekker]

From: Hans Leidekker

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57117
---
 dlls/advapi32/tests/crypt.c | 4 ++++
 dlls/rsaenh/rsaenh.c        | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/dlls/advapi32/tests/crypt.c b/dlls/advapi32/tests/crypt.c
index dfdcd0ce5ad..64067bea8ee 100644
--- a/dlls/advapi32/tests/crypt.c
+++ b/dlls/advapi32/tests/crypt.c
@@ -315,6 +315,10 @@ static void test_incorrect_api_usage(void)
     result = CryptGenKey(0, CALG_RC4, 0, &hKey);
     ok (!result && GetLastError() == ERROR_INVALID_PARAMETER, "%ld\n", GetLastError());

+    dwLen = 0;
+    SetLastError(0xdeadbeef);
+    result = CryptDecrypt(hKey, 0, FALSE, 0, &temp, &dwLen);
+    ok (result, "%lx\n", GetLastError());
     dwLen = 0;
     SetLastError(0xdeadbeef);
     result = CryptDecrypt(hKey, 0, TRUE, 0, &temp, &dwLen);
diff --git a/dlls/rsaenh/rsaenh.c b/dlls/rsaenh/rsaenh.c
index 7440aba7200..310982445cd 100644
--- a/dlls/rsaenh/rsaenh.c
+++ b/dlls/rsaenh/rsaenh.c
@@ -2763,7 +2763,7 @@ BOOL WINAPI RSAENH_CPDecrypt(HCRYPTPROV hProv, HCRYPTKEY hKey, HCRYPTHASH hHash,
         return FALSE;
     }

-    if (!*pdwDataLen)
+    if (Final && !*pdwDataLen)
     {
         SetLastError(NTE_BAD_LEN);
         return FALSE;