Security-57336.1.9.tar.gz

[apple/security.git] / OSX / sec / Security / vmdh.h

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+/*
+ * Copyright (c) 2006-2007,2012,2014 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+/*!
+       @header vmdh
+       The functions provided in vmdh.h implement the crypto exchange required
+    for a Diffie-Hellman voicemail exchange.
+*/
+
+#ifndef _SECURITY_VMDH_H_
+#define _SECURITY_VMDH_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct vmdh *vmdh_t;
+
+/* Return a newly allocated vmdh object given g, p and the recip of p recip.
+   The recip and recip_len parameters are constant for a given p.  They are
+   optional although providing them improves performance.
+   The caller should call vmdh_destroy once the returned handle is no longer
+   needed. */
+vmdh_t vmdh_create(uint32_t g, const uint8_t *p, size_t p_len,
+    const uint8_t *recip, size_t recip_len);
+
+/* Generate a dh private/public keypair and return the public key in pub_key.
+   on input *pub_key_len is the number of bytes available in pub_key, on output
+   pub_key_len is the number of bytes actually in pub_key.  Returns true on
+   success and false on failure. */
+bool vmdh_generate_key(vmdh_t vmdh, uint8_t *pub_key, size_t *pub_key_len);
+
+/* Given the length of a password return the size of the encrypted password. */
+#define vmdh_encpw_len(PWLEN) (((PWLEN) & ~0xf) + 16)
+
+/* Given a vmdh handle and the other parties public key pub_key (of
+   pub_key_len bytes long), encrypt the password given by pw of pw_len bytes
+   long and return it in encpw.  On input *enc_pw contains the number of bytes
+   available in encpw, on output *encpw will contain the actual length of
+   encpw. */ 
+bool vmdh_encrypt_password(vmdh_t vmdh,
+       const uint8_t *pub_key, size_t pub_key_len,
+    const uint8_t *pw, size_t pw_len, uint8_t *encpw, size_t *encpw_len);
+
+/* Destroy a vmdh object created with vmdh_create(). */
+void vmdh_destroy(vmdh_t vmdh);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SECURITY_VMDH_H_ */