source: svn/newcon3bcm2_21bu/nexus/lib/dtcp_ip/include/ecc.h

/******************************************************************************

 *    (c)2011 Broadcom Corporation

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 * $brcm_Workfile: ecc.h $

 * $brcm_Revision: 1 $

 * $brcm_Date: 11/8/11 2:43p $

 * 

 * Module Description:

 * 

 * Revision History:

 * 

 * $brcm_Log: /nexus/lib/dtcp_ip/include/ecc.h $

 * 

 * 1   11/8/11 2:43p leisun

 * SWSECURITY-86: Including original license term for bcrypt

 * 

 *****************************************************************************/

/****************************************************************************** 

 * ECC implementation is from "FreeMe" open source, see bellow for license term.

A license????  For anonymously published software?  Yes!  The purpose

here is to outline how I would like the software used.  Putting

together all this has been a lot of work, and I hope people can

respect the purpose behind the software, as spelled out here.





 1.  The purpose of this software is to re-assert your rights over

     fair use of audio files that you have legally purchased or

     otherwise obtained legally.  Please use it for that purpose only.

     Do not use it to unprotect files you don't have a legal right to,

     or to unprotect legal files for the purpose of re-distributing

     them to others who do not have a legal right to the content.  In

     other words, in use of this software obey traditional copyright

     laws -- but the DMCA may be completely ignored as far as this

     license concerned (although you must accept responsibility for

     ignoring this law, since it is enforceable).



 2.  This is free software, without any warranties, guarantees, or any

     assurance that it will work as described.  It relies on certain

     other software (from Microsoft) operating as it currently does,

     so I don't take any responsibility for what happens if Microsoft

     updates their software to render this useless, or even if they

     put bombs in their new software to erase all your files if they

     detect this software.  But I sure hope they wouldn't do that.

*********************************************************************/



/*

 * If the "neg" field of the BIGNUM struct is set, then this point is

 * the identity.  This is a terrible way to do this, since it's not

 * clear what the future of this flag is -- however, for now it works,

 * and it's fast...

 */



typedef struct eccpt_st {

        BIGNUM *x, *y;

} ECCpt;



typedef struct eccparam_st {

        BIGNUM *modulus;        /* Curve is over Z_modulus */

        BIGNUM *a, *b;          /* Curve coefficients */

        BIGNUM *n;                      /* Order of Generator */

        ECCpt generator;        /* Generator for our operations */

        ECCpt pubkey;           /* Public key */

        BIGNUM *privkey;        /* Corresponding private key */

} ECC;





ECC *ECC_new_set(BIGNUM * p, BIGNUM * a, BIGNUM * b, ECCpt g, BIGNUM *n);

void ECC_free(ECC * ecc);



void ECCpt_init(ECCpt * pt);

void ECCpt_free(ECCpt * pt);



int ECCpt_is_valid_pt(ECCpt * a, ECC * ecc);

int ECCpt_is_equal(ECCpt * a, ECCpt * b);

void ECCpt_add(ECCpt * r, ECCpt * a, ECCpt * b, ECC * ecc);

void ECCpt_mul(ECCpt * r, ECCpt * a, BIGNUM * n, ECC * ecc);