ecc.h

00001 /* ecc.h
00002  *
00003  * Copyright (C) 2006-2013 wolfSSL Inc.
00004  *
00005  * This file is part of CyaSSL.
00006  *
00007  * CyaSSL is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2 of the License, or
00010  * (at your option) any later version.
00011  *
00012  * CyaSSL is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
00020  */
00021 
00022 #ifdef HAVE_ECC
00023 
00024 #ifndef CTAO_CRYPT_ECC_H
00025 #define CTAO_CRYPT_ECC_H
00026 
00027 #include <cyassl/ctaocrypt/types.h>
00028 #include <cyassl/ctaocrypt/integer.h>
00029 #include <cyassl/ctaocrypt/random.h>
00030 
00031 #ifdef __cplusplus
00032     extern "C" {
00033 #endif
00034 
00035 
00036 enum {
00037     ECC_PUBLICKEY  = 1,
00038     ECC_PRIVATEKEY = 2,
00039     ECC_MAXNAME    = 16,     /* MAX CURVE NAME LENGTH */
00040     SIG_HEADER_SZ  =  6,     /* ECC signature header size */
00041     ECC_BUFSIZE    = 256,    /* for exported keys temp buffer */
00042     ECC_MINSIZE    = 20,     /* MIN Private Key size */
00043     ECC_MAXSIZE    = 66      /* MAX Private Key size */
00044 };
00045 
00046 
00047 /* ECC set type defined a NIST GF(p) curve */
00048 typedef struct {
00049     int size;       /* The size of the curve in octets */
00050     const char* name;     /* name of this curve */
00051     const char* prime;    /* prime that defines the field, curve is in (hex) */
00052     const char* Bf;       /* fields B param (hex) */
00053     const char* order;    /* order of the curve (hex) */
00054     const char* Gx;       /* x coordinate of the base point on curve (hex) */
00055     const char* Gy;       /* y coordinate of the base point on curve (hex) */
00056 } ecc_set_type;
00057 
00058 
00059 /* A point on an ECC curve, stored in Jacbobian format such that (x,y,z) =>
00060    (x/z^2, y/z^3, 1) when interpreted as affine */
00061 typedef struct {
00062     mp_int x;        /* The x coordinate */
00063     mp_int y;        /* The y coordinate */
00064     mp_int z;        /* The z coordinate */
00065 } ecc_point;
00066 
00067 
00068 /* An ECC Key */
00069 typedef struct {
00070     int type;           /* Public or Private */
00071     int idx;            /* Index into the ecc_sets[] for the parameters of
00072                            this curve if -1, this key is using user supplied
00073                            curve in dp */
00074     const ecc_set_type* dp;     /* domain parameters, either points to NIST
00075                                    curves (idx >= 0) or user supplied */
00076     ecc_point pubkey;   /* public key */  
00077     mp_int    k;        /* private key */
00078 } ecc_key;
00079 
00080 
00081 /* ECC predefined curve sets  */
00082 extern const ecc_set_type ecc_sets[];
00083 
00084 
00085 CYASSL_API
00086 int ecc_make_key(RNG* rng, int keysize, ecc_key* key);
00087 CYASSL_API
00088 int ecc_shared_secret(ecc_key* private_key, ecc_key* public_key, byte* out,
00089                       word32* outlen);
00090 CYASSL_API
00091 int ecc_sign_hash(const byte* in, word32 inlen, byte* out, word32 *outlen, 
00092                   RNG* rng, ecc_key* key);
00093 CYASSL_API
00094 int ecc_verify_hash(const byte* sig, word32 siglen, const byte* hash,
00095                     word32 hashlen, int* stat, ecc_key* key);
00096 CYASSL_API
00097 void ecc_init(ecc_key* key);
00098 CYASSL_API
00099 void ecc_free(ecc_key* key);
00100 CYASSL_API
00101 void ecc_fp_free(void);
00102 
00103 
00104 /* ASN key helpers */
00105 CYASSL_API
00106 int ecc_export_x963(ecc_key*, byte* out, word32* outLen);
00107 CYASSL_API
00108 int ecc_import_x963(const byte* in, word32 inLen, ecc_key* key);
00109 CYASSL_API
00110 int ecc_import_private_key(const byte* priv, word32 privSz, const byte* pub,
00111                            word32 pubSz, ecc_key* key);
00112 CYASSL_API
00113 int ecc_export_private_only(ecc_key* key, byte* out, word32* outLen);
00114 
00115 /* size helper */
00116 CYASSL_API
00117 int ecc_size(ecc_key* key);
00118 CYASSL_API
00119 int ecc_sig_size(ecc_key* key);
00120 
00121 
00122 #ifdef HAVE_ECC_ENCRYPT
00123 /* ecc encrypt */
00124 
00125 enum ecEncAlgo {
00126     ecAES_128_CBC = 1,  /* default */
00127     ecAES_256_CBC = 2
00128 };
00129 
00130 enum ecKdfAlgo {
00131     ecHKDF_SHA256 = 1,  /* default */
00132     ecHKDF_SHA1   = 2
00133 };
00134 
00135 enum ecMacAlgo {
00136     ecHMAC_SHA256 = 1,  /* default */
00137     ecHMAC_SHA1   = 2
00138 };
00139 
00140 enum {
00141     KEY_SIZE_128     = 16,   
00142     KEY_SIZE_256     = 32,   
00143     IV_SIZE_64       =  8,
00144     EXCHANGE_SALT_SZ = 16,  
00145     EXCHANGE_INFO_SZ = 23  
00146 };
00147 
00148 enum ecFlags {
00149     REQ_RESP_CLIENT = 1,
00150     REQ_RESP_SERVER = 2
00151 };
00152 
00153 
00154 typedef struct ecEncCtx ecEncCtx;
00155 
00156 CYASSL_API
00157 ecEncCtx* ecc_ctx_new(int flags, RNG* rng);
00158 CYASSL_API
00159 void ecc_ctx_free(ecEncCtx*);
00160 CYASSL_API
00161 int ecc_ctx_reset(ecEncCtx*, RNG*);   /* reset for use again w/o alloc/free */
00162 
00163 CYASSL_API
00164 const byte* ecc_ctx_get_own_salt(ecEncCtx*);
00165 CYASSL_API
00166 int ecc_ctx_set_peer_salt(ecEncCtx*, const byte* salt);
00167 
00168 CYASSL_API
00169 int ecc_encrypt(ecc_key* privKey, ecc_key* pubKey, const byte* msg,
00170                 word32 msgSz, byte* out, word32* outSz, ecEncCtx* ctx);
00171 CYASSL_API
00172 int ecc_decrypt(ecc_key* privKey, ecc_key* pubKey, const byte* msg,
00173                 word32 msgSz, byte* out, word32* outSz, ecEncCtx* ctx);
00174 
00175 #endif /* HAVE_ECC_ENCRYPT */
00176 
00177 #ifdef __cplusplus
00178     }    /* extern "C" */    
00179 #endif
00180 
00181 #endif /* CTAO_CRYPT_ECC_H */
00182 #endif /* HAVE_ECC */