rsaenh: Fix the accepted RC2 key length, based on a test case by Dan Kegel.

[Dmitry Timoshkov]

dlls/rsaenh/rc2.c,rc2_setup() accepts key length from 5 to 128, while
the provider description has the limits set to 40-56.

This patch fixes the problem reported in the bug 20337.
---
 dlls/advapi32/tests/crypt.c |   48 ++++++++++++++++++++++++++++++++++++++++--
 dlls/rsaenh/rsaenh.c        |    2 +-
 include/wincrypt.h          |    3 ++
 3 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/dlls/advapi32/tests/crypt.c b/dlls/advapi32/tests/crypt.c
index 4ce8907..3b60aea 100644
--- a/dlls/advapi32/tests/crypt.c
+++ b/dlls/advapi32/tests/crypt.c
@@ -933,17 +933,59 @@ static void test_machine_guid(void)
    RegCloseKey(key);
 }
 
+#define key_length 16
+
+static const unsigned char key[key_length] =
+    { 0xbf, 0xf6, 0x83, 0x4b, 0x3e, 0xa3, 0x23, 0xdd,
+      0x96, 0x78, 0x70, 0x8e, 0xa1, 0x9d, 0x3b, 0x40 };
+
+static void hashtest(void)
+{
+    struct KeyBlob
+    {
+        BLOBHEADER header;
+        DWORD key_size;
+        BYTE key_data[key_length];
+    } key_blob;
+
+    HCRYPTPROV provider;
+    HCRYPTKEY hkey;
+    BOOL ret;
+
+    SetLastError(0xdeadbeef);
+    ret = pCryptAcquireContextA(&provider, NULL, NULL,
+                                PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
+    ok(ret, "CryptAcquireContext error %u\n", GetLastError());
+
+    key_blob.header.bType = PLAINTEXTKEYBLOB;
+    key_blob.header.bVersion = CUR_BLOB_VERSION;
+    key_blob.header.reserved = 0;
+    key_blob.header.aiKeyAlg = CALG_RC2;
+    key_blob.key_size = key_length;
+    memcpy(key_blob.key_data, key, key_length);
+
+    SetLastError(0xdeadbeef);
+    ret = pCryptImportKey(provider, (BYTE*)&key_blob,
+                      sizeof(BLOBHEADER)+sizeof(DWORD)+key_length,
+                      0, CRYPT_IPSEC_HMAC_KEY, &hkey);
+    ok(ret, "CryptImportKey error %u\n", GetLastError());
+
+    pCryptReleaseContext(provider, 0);
+}
+
 START_TEST(crypt)
 {
-	init_function_pointers();
-	if(pCryptAcquireContextA && pCryptReleaseContext) {
+    init_function_pointers();
+    if (pCryptAcquireContextA && pCryptReleaseContext)
+    {
+	hashtest();
 	init_environment();
 	test_acquire_context();
 	test_incorrect_api_usage();
 	test_verify_sig();
 	test_machine_guid();
 	clean_up_environment();
-	}
+    }
 	
 	test_enum_providers();
 	test_enum_provider_types();
diff --git a/dlls/rsaenh/rsaenh.c b/dlls/rsaenh/rsaenh.c
index 8ae9659..04048cf 100644
--- a/dlls/rsaenh/rsaenh.c
+++ b/dlls/rsaenh/rsaenh.c
@@ -159,7 +159,7 @@ typedef struct tagKEYCONTAINER
 static const PROV_ENUMALGS_EX aProvEnumAlgsEx[5][RSAENH_MAX_ENUMALGS+1] =
 {
  {
-  {CALG_RC2,       40, 40,   56,0,                    4,"RC2",     24,"RSA Data Security's RC2"},
+  {CALG_RC2,       40, 5,   128,0,                    4,"RC2",     24,"RSA Data Security's RC2"},
   {CALG_RC4,       40, 40,   56,0,                    4,"RC4",     24,"RSA Data Security's RC4"},
   {CALG_DES,       56, 56,   56,0,                    4,"DES",     31,"Data Encryption Standard (DES)"},
   {CALG_SHA,      160,160,  160,CRYPT_FLAG_SIGNING,   6,"SHA-1",   30,"Secure Hash Algorithm (SHA-1)"},
diff --git a/include/wincrypt.h b/include/wincrypt.h
index 0aef72e..56a0155 100644
--- a/include/wincrypt.h
+++ b/include/wincrypt.h
@@ -80,6 +80,9 @@ typedef struct _SCHANNEL_ALG {
   DWORD  dwReserved;
 } SCHANNEL_ALG, *PSCHANNEL_ALG;
 
+
+#define CRYPT_IPSEC_HMAC_KEY 0x0100
+
 typedef struct _HMAC_INFO {
   ALG_ID HashAlgid;
   BYTE*  pbInnerString;
-- 
1.6.4.2