/* * 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_ */