[PATCH 5/7] bcrypt: Make DH blob size validation more strict in key_import_pair().

[Hans Leidekker]

From: Hans Leidekker

---
 dlls/bcrypt/bcrypt_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dlls/bcrypt/bcrypt_main.c b/dlls/bcrypt/bcrypt_main.c
index f7a22634203..274bb27d9e8 100644
--- a/dlls/bcrypt/bcrypt_main.c
+++ b/dlls/bcrypt/bcrypt_main.c
@@ -1929,7 +1929,7 @@ static NTSTATUS key_import_pair( struct algorithm *alg, const WCHAR *type, BCRYP
     {
         BCRYPT_DH_KEY_BLOB *dh_blob = (BCRYPT_DH_KEY_BLOB *)input;

-        if (input_len < sizeof(*dh_blob)) return STATUS_INVALID_PARAMETER;
+        if (input_len != sizeof(*dh_blob) + dh_blob->cbKey * 4) return STATUS_INVALID_PARAMETER;
         if (alg->id != ALG_ID_DH || dh_blob->dwMagic != BCRYPT_DH_PRIVATE_MAGIC)
             return STATUS_NOT_SUPPORTED;

@@ -1948,7 +1948,7 @@ static NTSTATUS key_import_pair( struct algorithm *alg, const WCHAR *type, BCRYP
     {
         BCRYPT_DH_KEY_BLOB *dh_blob = (BCRYPT_DH_KEY_BLOB *)input;

-        if (input_len < sizeof(*dh_blob)) return STATUS_INVALID_PARAMETER;
+        if (input_len != sizeof(*dh_blob) + dh_blob->cbKey * 3) return STATUS_INVALID_PARAMETER;
         if (alg->id != ALG_ID_DH || dh_blob->dwMagic != BCRYPT_DH_PUBLIC_MAGIC)
             return STATUS_NOT_SUPPORTED;