Security-55163.44.tar.gz

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

diff --git a/sec/Security/vmdh.h b/sec/Security/vmdh.h
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+/*
+ *  vmdh.h
+ *  Security
+ *
+ *  Created by Michael Brouwer on 11/7/06.
+ *  Copyright (c) 2006-2007 Apple Inc. All Rights Reserved.
+ *
+ */
+
+/*!
+       @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_ */