[PATCH 5/7] bcrypt: Handle PBKDF2 in BCryptGenerateSymmetricKey.

[Piotr Caban]

From: Piotr Caban

---
 dlls/bcrypt/bcrypt_main.c  | 14 +++++++++++---
 dlls/bcrypt/tests/bcrypt.c | 11 +++++++++++
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/dlls/bcrypt/bcrypt_main.c b/dlls/bcrypt/bcrypt_main.c
index 35474d67125..07475d7f853 100644
--- a/dlls/bcrypt/bcrypt_main.c
+++ b/dlls/bcrypt/bcrypt_main.c
@@ -128,7 +128,8 @@ builtin_algorithms[] =

static inline BOOL is_symmetric_key( const struct key *key )
 {
-    return builtin_algorithms[key->alg_id].class == BCRYPT_CIPHER_INTERFACE;
+    return builtin_algorithms[key->alg_id].class == BCRYPT_CIPHER_INTERFACE
+        || builtin_algorithms[key->alg_id].class == BCRYPT_KEY_DERIVATION_INTERFACE;
 }

static inline BOOL is_asymmetric_encryption_key( struct key *key )
@@ -1209,8 +1210,15 @@ static NTSTATUS key_symmetric_generate( struct algorithm *alg, BCRYPT_KEY_HANDLE
     struct key *key;
     NTSTATUS status;

-    if (!(block_size = get_block_size( alg ))) return STATUS_INVALID_PARAMETER;
-    if (!get_alg_property( alg, BCRYPT_KEY_LENGTHS, (UCHAR *)&key_lengths, sizeof(key_lengths), &size ))
+    if (alg->id == ALG_ID_PBKDF2 &&
+            !get_alg_property( alg, BCRYPT_KEY_LENGTHS, (UCHAR *)&key_lengths, sizeof(key_lengths), &size ))
+    {
+        if (secret_len > key_lengths.dwMaxLength / 8
+                || secret_len < key_lengths.dwMinLength / 8) return STATUS_INVALID_PARAMETER;
+        block_size = secret_len;
+    }
+    else if (!(block_size = get_block_size( alg ))) return STATUS_INVALID_PARAMETER;
+    else if (!get_alg_property( alg, BCRYPT_KEY_LENGTHS, (UCHAR *)&key_lengths, sizeof(key_lengths), &size ))
     {
         if (secret_len > (size = key_lengths.dwMaxLength / 8))
         {
diff --git a/dlls/bcrypt/tests/bcrypt.c b/dlls/bcrypt/tests/bcrypt.c
index 640629c4dee..272819d3335 100644
--- a/dlls/bcrypt/tests/bcrypt.c
+++ b/dlls/bcrypt/tests/bcrypt.c
@@ -4374,6 +4374,7 @@ static void test_PBKDF2(void)
 {
     BCRYPT_KEY_LENGTHS_STRUCT key_lengths;
     BCRYPT_ALG_HANDLE alg;
+    BCRYPT_KEY_HANDLE key;
     NTSTATUS status;
     ULONG val, size;

@@ -4404,6 +4405,16 @@ static void test_PBKDF2(void)
     ok(key_lengths.dwMaxLength == 16384, "got %lu\n", key_lengths.dwMaxLength);
     ok(key_lengths.dwIncrement == 8, "got %lu\n", key_lengths.dwIncrement);

+    key = 0;
+    status = BCryptGenerateSymmetricKey(alg, &key, NULL, 0, (UCHAR *)"test", 4, 0);
+    ok(!status, "got %#lx\n", status);
+    val = size = 0;
+    status = BCryptGetProperty(key, BCRYPT_KEY_STRENGTH, (UCHAR *)&val, sizeof(val), &size, 0);
+    ok(!status, "got %#lx\n", status);
+    ok(val == strlen("test") * 8, "got %lu\n", val);
+
+    status = BCryptDestroyKey(key);
+    ok(!status, "got %#lx\n", status);
     status = BCryptCloseAlgorithmProvider(alg, 0);
     ok(status == STATUS_SUCCESS, "got %#lx\n", status);
 }