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/* Demo of how to construct your own engine and using it. The basis of this
engine is RSAref, an old reference of the RSA algorithm which can still
be found a little here and there. */
#include <stdio.h>
#if 0
#include "./source/global.h"
#include "./source/rsaref.h"
#endif
#include "rsaref.h"
#include <openssl/err.h>
#include <openssl/bn.h>
#include <openssl/engine.h>
/* Constants used when creating the ENGINE */
static const char *engine_rsaref_id = "rsaref";
static const char *engine_rsaref_name = "RSAref engine support";
static int rsaref_destroy(ENGINE *e);
static int rsaref_init(ENGINE *e);
static int rsaref_finish(ENGINE *e);
#if 0
static int rsaref_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)());
#endif
static int rsaref_private_decrypt(int len, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding);
static int rsaref_private_encrypt(int len, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding);
static int rsaref_public_encrypt(int len, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding);
static int rsaref_public_decrypt(int len, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding);
static int bnref_mod_exp(BIGNUM *r,const BIGNUM *a,const BIGNUM *p,const BIGNUM *m,
BN_CTX *ctx, BN_MONT_CTX *m_ctx);
static int rsaref_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa);
static const ENGINE_CMD_DEFN rsaref_cmd_defns[] = {
{0, NULL, NULL, 0}
};
static RSA_METHOD rsaref_rsa =
{
"RSAref PKCS#1 RSA",
rsaref_public_encrypt,
rsaref_public_decrypt,
rsaref_private_encrypt,
rsaref_private_decrypt,
rsaref_mod_exp,
bnref_mod_exp,
NULL,
NULL,
0,
NULL,
NULL,
NULL
};
#ifndef OPENSSL_NO_ERR
/* Error function codes for use in rsaref operation */
#define RSAREF_F_BNREF_MOD_EXP 100
#define RSAREF_F_RSAREF_BN2BIN 101
#define RSAREF_F_RSA_BN2BIN 102
#define RSAREF_F_RSA_PRIVATE_DECRYPT 103
#define RSAREF_F_RSA_PRIVATE_ENCRYPT 104
#define RSAREF_F_RSA_PUBLIC_DECRYPT 105
#define RSAREF_F_RSA_PUBLIC_ENCRYPT 106
#define RSAREF_F_RSAREF_MOD_EXP 108
#define RSAREF_F_RSAREF_PRIVATE_DECRYPT 109
#define RSAREF_F_RSAREF_PRIVATE_ENCRYPT 110
#define RSAREF_F_RSAREF_PUBLIC_DECRYPT 111
#define RSAREF_F_RSAREF_PUBLIC_ENCRYPT 112
/* Error reason codes */
#define RSAREF_R_CONTENT_ENCODING 0x0400
#define RSAREF_R_DATA 0x0401
#define RSAREF_R_DIGEST_ALGORITHM 0x0402
#define RSAREF_R_ENCODING 0x0403
#define RSAREF_R_ENCRYPTION_ALGORITHM 0x040d
#define RSAREF_R_KEY 0x0404
#define RSAREF_R_KEY_ENCODING 0x0405
#define RSAREF_R_LEN 0x0406
#define RSAREF_R_MODULUS_LEN 0x0407
#define RSAREF_R_NEED_RANDOM 0x0408
#define RSAREF_R_PRIVATE_KEY 0x0409
#define RSAREF_R_PUBLIC_KEY 0x040a
#define RSAREF_R_SIGNATURE 0x040b
#define RSAREF_R_SIGNATURE_ENCODING 0x040c
static ERR_STRING_DATA rsaref_str_functs[] =
{
/* This first element is changed to match the dynamic 'lib' number */
{ERR_PACK(0,0,0), "rsaref engine code"},
{ERR_PACK(0,RSAREF_F_BNREF_MOD_EXP,0), "BN_REF_MOD_EXP"},
{ERR_PACK(0,RSAREF_F_RSAREF_BN2BIN,0), "RSAREF_BN2BIN"},
{ERR_PACK(0,RSAREF_F_RSA_BN2BIN,0), "RSA_BN2BIN"},
{ERR_PACK(0,RSAREF_F_RSA_PRIVATE_DECRYPT,0), "RSA_private_decrypt"},
{ERR_PACK(0,RSAREF_F_RSA_PRIVATE_ENCRYPT,0), "RSA_private_encrypt"},
{ERR_PACK(0,RSAREF_F_RSA_PUBLIC_DECRYPT,0), "RSA_public_decrypt"},
{ERR_PACK(0,RSAREF_F_RSA_PUBLIC_ENCRYPT,0), "RSA_public_encrypt"},
{ERR_PACK(0,RSAREF_F_RSAREF_MOD_EXP,0), "RSA_REF_MOD_EXP"},
{ERR_PACK(0,RSAREF_F_RSAREF_PRIVATE_DECRYPT,0), "RSA_REF_PRIVATE_DECRYPT"},
{ERR_PACK(0,RSAREF_F_RSAREF_PRIVATE_ENCRYPT,0), "RSA_REF_PRIVATE_ENCRYPT"},
{ERR_PACK(0,RSAREF_F_RSAREF_PUBLIC_DECRYPT,0), "RSA_REF_PUBLIC_DECRYPT"},
{ERR_PACK(0,RSAREF_F_RSAREF_PUBLIC_ENCRYPT,0), "RSA_REF_PUBLIC_ENCRYPT"},
{RSAREF_R_CONTENT_ENCODING ,"content encoding"},
{RSAREF_R_DATA ,"data"},
{RSAREF_R_DIGEST_ALGORITHM ,"digest algorithm"},
{RSAREF_R_ENCODING ,"encoding"},
{RSAREF_R_ENCRYPTION_ALGORITHM ,"encryption algorithm"},
{RSAREF_R_KEY ,"key"},
{RSAREF_R_KEY_ENCODING ,"key encoding"},
{RSAREF_R_LEN ,"len"},
{RSAREF_R_MODULUS_LEN ,"modulus len"},
{RSAREF_R_NEED_RANDOM ,"need random"},
{RSAREF_R_PRIVATE_KEY ,"private key"},
{RSAREF_R_PUBLIC_KEY ,"public key"},
{RSAREF_R_SIGNATURE ,"signature"},
{RSAREF_R_SIGNATURE_ENCODING ,"signature encoding"},
{0,NULL}
};
/* The library number we obtain dynamically from the ERR code */
static int rsaref_err_lib = -1;
#define RSAREFerr(f,r) ERR_PUT_error(rsaref_err_lib,(f),(r),__FILE__,__LINE__)
static void rsaref_load_error_strings(void)
{
if(rsaref_err_lib < 0)
{
if((rsaref_err_lib = ERR_get_next_error_library()) <= 0)
return;
rsaref_str_functs[0].error = ERR_PACK(rsaref_err_lib,0,0);
ERR_load_strings(rsaref_err_lib, rsaref_str_functs);
}
}
static void rsaref_unload_error_strings(void)
{
if(rsaref_err_lib >= 0)
{
ERR_unload_strings(rsaref_err_lib, rsaref_str_functs);
rsaref_err_lib = -1;
}
}
#else
#define RSAREFerr(f,r) /* NOP */
static void rsaref_load_error_strings(void) { } /* NOP */
static void rsaref_unload_error_strings(void) { } /* NOP */
#endif
/* Now, to our own code */
static int bind_rsaref(ENGINE *e)
{
const RSA_METHOD *meth1;
if(!ENGINE_set_id(e, engine_rsaref_id)
|| !ENGINE_set_name(e, engine_rsaref_name)
|| !ENGINE_set_RSA(e, &rsaref_rsa)
|| !ENGINE_set_destroy_function(e, rsaref_destroy)
|| !ENGINE_set_init_function(e, rsaref_init)
|| !ENGINE_set_finish_function(e, rsaref_finish)
/* || !ENGINE_set_ctrl_function(e, rsaref_ctrl) */
/* || !ENGINE_set_cmd_defns(e, rsaref_cmd_defns) */)
return 0;
/* Ensure the rsaref error handling is set up */
rsaref_load_error_strings();
return 1;
}
#ifdef ENGINE_DYNAMIC_SUPPORT
static int bind_helper(ENGINE *e, const char *id)
{
if(id && (strcmp(id, engine_rsaref_id) != 0))
return 0;
if(!bind_rsaref(e))
return 0;
return 1;
}
IMPLEMENT_DYNAMIC_CHECK_FN()
IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
#else
static ENGINE *engine_rsaref(void)
{
ENGINE *ret = ENGINE_new();
if(!ret)
return NULL;
if(!bind_rsaref(ret))
{
ENGINE_free(ret);
return NULL;
}
return ret;
}
void ENGINE_load_rsaref(void)
{
/* Copied from eng_[openssl|dyn].c */
ENGINE *toadd = engine_rsaref();
if(!toadd) return;
ENGINE_add(toadd);
ENGINE_free(toadd);
ERR_clear_error();
}
#endif
/* Initiator which is only present to make sure this engine looks available */
static int rsaref_init(ENGINE *e)
{
return 1;
}
/* Finisher which is only present to make sure this engine looks available */
static int rsaref_finish(ENGINE *e)
{
return 1;
}
/* Destructor (complements the "ENGINE_ncipher()" constructor) */
static int rsaref_destroy(ENGINE *e)
{
rsaref_unload_error_strings();
return 1;
}
static int rsaref_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
{
RSAREFerr(RSAREF_F_RSAREF_MOD_EXP,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return(0);
}
static int bnref_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
{
RSAREFerr(RSAREF_F_BNREF_MOD_EXP,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return(0);
}
/* unsigned char *to: [max] */
static int RSAref_bn2bin(BIGNUM *from, unsigned char *to, int max)
{
int i;
i=BN_num_bytes(from);
if (i > max)
{
RSAREFerr(RSAREF_F_RSAREF_BN2BIN,RSAREF_R_LEN);
return(0);
}
memset(to,0,(unsigned int)max);
if (!BN_bn2bin(from,&(to[max-i])))
return(0);
return(1);
}
#ifdef undef
/* unsigned char *from: [max] */
static BIGNUM *RSAref_bin2bn(unsigned char *from,
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