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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>
#include "./source/global.h"
#include "./source/rsaref.h"
#include "./source/rsa.h"
#include <openssl/err.h>
#include <openssl/bn.h>
#include <openssl/engine.h>
#define RSAREF_LIB_NAME "rsaref engine"
#include "rsaref_err.c"
/* 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
};
/* 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 */
ERR_load_RSAREF_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)
{
ERR_unload_RSAREF_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, BIGNUM *to, int max)
{
int i;
BIGNUM *ret;
for (i=0; i<max; i++)
if (from[i]) break;
ret=BN_bin2bn(&(from[i]),max-i,to);
return(ret);
}
static int RSAref_Public_ref2eay(RSArefPublicKey *from, RSA *to)
{
to->n=RSAref_bin2bn(from->m,NULL,RSAref_MAX_LEN);
to->e=RSAref_bin2bn(from->e,NULL,RSAref_MAX_LEN);
if ((to->n == NULL) || (to->e == NULL)) return(0);
return(1);
}
#endif
static int RSAref_Public_eay2ref(RSA *from, R_RSA_PUBLIC_KEY *to)
{
to->bits=BN_num_bits(from->n);
if (!RSAref_bn2bin(from->n,to->modulus,MAX_RSA_MODULUS_LEN)) return(0);
if (!RSAref_bn2bin(from->e,to->exponent,MAX_RSA_MODULUS_LEN)) return(0);
return(1);
}
#ifdef undef
static int RSAref_Private_ref2eay(RSArefPrivateKey *from, RSA *to)
{
if ((to->n=RSAref_bin2bn(from->m,NULL,RSAref_MAX_LEN)) == NULL)
return(0);
if ((to->e=RSAref_bin2bn(from->e,NULL,RSAref_MAX_LEN)) == NULL)
return(0);
if ((to->d=RSAref_bin2bn(from->d,NULL,RSAref_MAX_LEN)) == NULL)
return(0);
if ((to->p=RSAref_bin2bn(from->prime[0],NULL,RSAref_MAX_PLEN)) == NULL)
return(0);
if ((to->q=RSAref_bin2bn(from->prime[1],NULL,RSAref_MAX_PLEN)) == NULL)
return(0);
if ((to->dmp1=RSAref_bin2bn(from->pexp[0],NULL,RSAref_MAX_PLEN))
== NULL)
return(0);
if ((to->dmq1=RSAref_bin2bn(from->pexp[1],NULL,RSAref_MAX_PLEN))
== NULL)
return(0);
if ((to->iqmp=RSAref_bin2bn(from->coef,NULL,RSAref_MAX_PLEN)) == NULL)
return(0);
return(1);
}
#endif
static int RSAref_Private_eay2ref(RSA *from, R_RSA_PRIVATE_KEY *to)
{
to->bits=BN_num_bits(from->n);
if (!RSAref_bn2bin(from->n,to->modulus,MAX_RSA_MODULUS_LEN)) return(0);
if (!RSAref_bn2bin(from->e,to->publicExponent,MAX_RSA_MODULUS_LEN)) return(0);
if (!RSAref_bn2bin(from->d,to->exponent,MAX_RSA_MODULUS_LEN)) return(0);
if (!RSAref_bn2bin(from->p,to->prime[0],MAX_RSA_PRIME_LEN)) return(0);
if (!RSAref_bn2bin(from->q,
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