NTLM Crypto functions

Adds crypto function helpers needed by NTLM authentication

1 files changed, 117 insertions, 0 deletions

diff --git a/src/crypto.h b/src/crypto.h
new file mode 100644
index 0000000..3a2f6f9
--- /dev/null
+++ b/src/crypto.h
@@ -0,0 +1,117 @@
+/*
+   Copyright (C) 2013 Simo Sorce <simo@samba.org>
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _SRC_CRYPTO_H_
+#define _SRC_CRYPTO_H_
+
+#include <stdbool.h>
+#include "ntlm_common.h"
+
+/**
+ * @brief   Fills the provided preallocated buffer with random data
+ *
+ * @param random        A preallocated buffer, length determines the amount of
+ *                      random bytes the function will return.
+ *
+ * @return 0 for success or error otherwise
+ */
+int RAND_BUFFER(struct ntlm_buffer *random);
+
+/**
+ * @brief HMAC-MD5 function
+ *
+ * @param key           The authentication key
+ * @param payload       The payload to be authenticated
+ * @param result        A preallocated 16 byte buffer
+ *
+ * @return 0 on success or ERR_CRYPTO
+ */
+int HMAC_MD5(struct ntlm_buffer *key,
+             struct ntlm_buffer *payload,
+             struct ntlm_buffer *result);
+
+/**
+ * @brief MD4 Hash Function
+ *
+ * @param payload   The payoad to hash
+ * @param result    The resulting Hash (preallocated, length must be 16)
+ *
+ * @return 0 on success or an error
+ */
+int MD4_HASH(struct ntlm_buffer *payload,
+             struct ntlm_buffer *result);
+
+/**
+ * @brief MD5 Hash Function
+ *
+ * @param payload   The payoad to hash
+ * @param result    The resulting Hash (preallocated, length must be 16)
+ *
+ * @return 0 on success or an error
+ */
+int MD5_HASH(struct ntlm_buffer *payload,
+             struct ntlm_buffer *result);
+
+/**
+ * @brief RC4 engine initialization
+ *
+ * @param rc4_key   The encryption/decryption key
+ * @param mode      The cipher mode
+ * @param state     Allocated ntlm_rc4_state structure
+ *
+ * @return 0 on success or error
+ */
+int RC4_INIT(struct ntlm_buffer *rc4_key,
+             enum ntlm_cipher_mode mode,
+             struct ntlm_rc4_handle **handle);
+
+
+/**
+ * @brief RC4 encrypt/decrypt function
+ *
+ * @param state     The state initialized by RC4_INIT
+ * @param in        Input buffer (plaintext for enc or ciphertext for dec)
+ * @param out       Resulting buffer. Must be preallocated.
+ *
+ * @return 0 on success or error
+ */
+int RC4_UPDATE(struct ntlm_rc4_handle *handle,
+               struct ntlm_buffer *in, struct ntlm_buffer *out);
+
+/**
+ * @brief           Release an rc4 handle
+ *
+ * @param state     A pointer to the rc4 handle
+ */
+void RC4_FREE(struct ntlm_rc4_handle **handle);
+
+/**
+ * @brief RC4 encryption/decryption all in one
+ *
+ * @param key       The encryption/decryption key
+ * @param mode      The cipher mode
+ * @param payload   Input buffer (plaintext for enc or ciphertext for dec)
+ * @param result    Resulting buffer. Must be preallocated.
+ *
+ * @return 0 on success or error
+ */
+int RC4K(struct ntlm_buffer *key,
+         enum ntlm_cipher_mode mode,
+         struct ntlm_buffer *payload,
+struct ntlm_buffer *result);
+
+#endif /* _SRC_CRYPTO_H_ */