ref: 7f224a8f6d343cf0aaf162cc9b9f7d4d62ac78ac
dir: /sys/src/ape/lib/openssl/demos/engines/rsaref/rsaref.c/
/* 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 <string.h>
#include "./source/global.h"
#include "./source/rsaref.h"
#include "./source/rsa.h"
#include "./source/des.h"
#include <openssl/err.h>
#define OPENSSL_NO_MD2
#define OPENSSL_NO_MD5
#include <openssl/evp.h>
#include <openssl/bn.h>
#include <openssl/engine.h>
#define RSAREF_LIB_NAME "rsaref engine"
#include "rsaref_err.c"
/*****************************************************************************
*** Function declarations and global variable definitions ***
*****************************************************************************/
/*****************************************************************************
* Constants used when creating the ENGINE
**/
static const char *engine_rsaref_id = "rsaref";
static const char *engine_rsaref_name = "RSAref engine support";
/*****************************************************************************
* Functions to handle the engine
**/
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
/*****************************************************************************
* Engine commands
**/
static const ENGINE_CMD_DEFN rsaref_cmd_defns[] = {
{0, NULL, NULL, 0}
};
/*****************************************************************************
* RSA functions
**/
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);
/*****************************************************************************
* Our RSA method
**/
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
};
/*****************************************************************************
* Symetric cipher and digest function registrars
**/
static int rsaref_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
const int **nids, int nid);
static int rsaref_digests(ENGINE *e, const EVP_MD **digest,
const int **nids, int nid);
static int rsaref_cipher_nids[] =
{ NID_des_cbc, NID_des_ede3_cbc, NID_desx_cbc, 0 };
static int rsaref_digest_nids[] =
{ NID_md2, NID_md5, 0 };
/*****************************************************************************
* DES functions
**/
static int cipher_des_cbc_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
static int cipher_des_cbc_code(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl);
static int cipher_des_cbc_clean(EVP_CIPHER_CTX *);
static int cipher_des_ede3_cbc_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
static int cipher_des_ede3_cbc_code(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl);
static int cipher_des_ede3_cbc_clean(EVP_CIPHER_CTX *);
static int cipher_desx_cbc_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
static int cipher_desx_cbc_code(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl);
static int cipher_desx_cbc_clean(EVP_CIPHER_CTX *);
/*****************************************************************************
* Our DES ciphers
**/
static const EVP_CIPHER cipher_des_cbc =
{
NID_des_cbc,
8, 8, 8,
0 | EVP_CIPH_CBC_MODE,
cipher_des_cbc_init,
cipher_des_cbc_code,
cipher_des_cbc_clean,
sizeof(DES_CBC_CTX),
NULL,
NULL,
NULL,
NULL
};
static const EVP_CIPHER cipher_des_ede3_cbc =
{
NID_des_ede3_cbc,
8, 24, 8,
0 | EVP_CIPH_CBC_MODE,
cipher_des_ede3_cbc_init,
cipher_des_ede3_cbc_code,
cipher_des_ede3_cbc_clean,
sizeof(DES3_CBC_CTX),
NULL,
NULL,
NULL,
NULL
};
static const EVP_CIPHER cipher_desx_cbc =
{
NID_desx_cbc,
8, 24, 8,
0 | EVP_CIPH_CBC_MODE,
cipher_desx_cbc_init,
cipher_desx_cbc_code,
cipher_desx_cbc_clean,
sizeof(DESX_CBC_CTX),
NULL,
NULL,
NULL,
NULL
};
/*****************************************************************************
* MD functions
**/
static int digest_md2_init(EVP_MD_CTX *ctx);
static int digest_md2_update(EVP_MD_CTX *ctx,const void *data,
unsigned long count);
static int digest_md2_final(EVP_MD_CTX *ctx,unsigned char *md);
static int digest_md5_init(EVP_MD_CTX *ctx);
static int digest_md5_update(EVP_MD_CTX *ctx,const void *data,
unsigned long count);
static int digest_md5_final(EVP_MD_CTX *ctx,unsigned char *md);
/*****************************************************************************
* Our MD digests
**/
static const EVP_MD digest_md2 =
{
NID_md2,
NID_md2WithRSAEncryption,
16,
0,
digest_md2_init,
digest_md2_update,
digest_md2_final,
NULL,
NULL,
EVP_PKEY_RSA_method,
16,
sizeof(MD2_CTX)
};
static const EVP_MD digest_md5 =
{
NID_md5,
NID_md5WithRSAEncryption,
16,
0,
digest_md5_init,
digest_md5_update,
digest_md5_final,
NULL,
NULL,
EVP_PKEY_RSA_method,
64,
sizeof(MD5_CTX)
};
/*****************************************************************************
*** Function definitions ***
*****************************************************************************/
/*****************************************************************************
* Functions to handle the engine
**/
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_ciphers(e, rsaref_ciphers)
|| !ENGINE_set_digests(e, rsaref_digests)
|| !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;
}
/*****************************************************************************
* RSA functions
**/
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,to->prime[1],MAX_RSA_PRIME_LEN)) return(0);
if (!RSAref_bn2bin(from->dmp1,to->primeExponent[0],MAX_RSA_PRIME_LEN)) return(0);
if (!RSAref_bn2bin(from->dmq1,to->primeExponent[1],MAX_RSA_PRIME_LEN)) return(0);
if (!RSAref_bn2bin(from->iqmp,to->coefficient,MAX_RSA_PRIME_LEN)) return(0);
return(1);
}
static int rsaref_private_decrypt(int len, const unsigned char *from, unsigned char *to,
RSA *rsa, int padding)
{
int i,outlen= -1;
R_RSA_PRIVATE_KEY RSAkey;
if (!RSAref_Private_eay2ref(rsa,&RSAkey))
goto err;
if ((i=RSAPrivateDecrypt(to,(unsigned int *)&outlen,(unsigned char *)from,len,&RSAkey)) != 0)
{
RSAREFerr(RSAREF_F_RSAREF_PRIVATE_DECRYPT,i);
outlen= -1;
}
err:
memset(&RSAkey,0,sizeof(RSAkey));
return(outlen);
}
static int rsaref_private_encrypt(int len, const unsigned char *from, unsigned char *to,
RSA *rsa, int padding)
{
int i,outlen= -1;
R_RSA_PRIVATE_KEY RSAkey;
if (padding != RSA_PKCS1_PADDING)
{
RSAREFerr(RSAREF_F_RSAREF_PRIVATE_ENCRYPT, RSA_R_UNKNOWN_PADDING_TYPE);
goto err;
}
if (!RSAref_Private_eay2ref(rsa,&RSAkey))
goto err;
if ((i=RSAPrivateEncrypt(to,(unsigned int *)&outlen,(unsigned char *)from,len,&RSAkey)) != 0)
{
RSAREFerr(RSAREF_F_RSAREF_PRIVATE_ENCRYPT,i);
outlen= -1;
}
err:
memset(&RSAkey,0,sizeof(RSAkey));
return(outlen);
}
static int rsaref_public_decrypt(int len, const unsigned char *from, unsigned char *to,
RSA *rsa, int padding)
{
int i,outlen= -1;
R_RSA_PUBLIC_KEY RSAkey;
if (!RSAref_Public_eay2ref(rsa,&RSAkey))
goto err;
if ((i=RSAPublicDecrypt(to,(unsigned int *)&outlen,(unsigned char *)from,len,&RSAkey)) != 0)
{
RSAREFerr(RSAREF_F_RSAREF_PUBLIC_DECRYPT,i);
outlen= -1;
}
err:
memset(&RSAkey,0,sizeof(RSAkey));
return(outlen);
}
static int rsaref_public_encrypt(int len, const unsigned char *from, unsigned char *to,
RSA *rsa, int padding)
{
int outlen= -1;
int i;
R_RSA_PUBLIC_KEY RSAkey;
R_RANDOM_STRUCT rnd;
unsigned char buf[16];
if (padding != RSA_PKCS1_PADDING && padding != RSA_SSLV23_PADDING)
{
RSAREFerr(RSAREF_F_RSAREF_PUBLIC_ENCRYPT, RSA_R_UNKNOWN_PADDING_TYPE);
goto err;
}
R_RandomInit(&rnd);
R_GetRandomBytesNeeded((unsigned int *)&i,&rnd);
while (i > 0)
{
if (RAND_bytes(buf,16) <= 0)
goto err;
R_RandomUpdate(&rnd,buf,(unsigned int)((i>16)?16:i));
i-=16;
}
if (!RSAref_Public_eay2ref(rsa,&RSAkey))
goto err;
if ((i=RSAPublicEncrypt(to,(unsigned int *)&outlen,(unsigned char *)from,len,&RSAkey,&rnd)) != 0)
{
RSAREFerr(RSAREF_F_RSAREF_PUBLIC_ENCRYPT,i);
outlen= -1;
goto err;
}
err:
memset(&RSAkey,0,sizeof(RSAkey));
R_RandomFinal(&rnd);
memset(&rnd,0,sizeof(rnd));
return(outlen);
}
/*****************************************************************************
* Symetric cipher and digest function registrars
**/
static int rsaref_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
const int **nids, int nid)
{
int ok = 1;
if(!cipher)
{
/* We are returning a list of supported nids */
*nids = rsaref_cipher_nids;
return (sizeof(rsaref_cipher_nids)-1)/sizeof(rsaref_cipher_nids[0]);
}
/* We are being asked for a specific cipher */
switch (nid)
{
case NID_des_cbc:
*cipher = &cipher_des_cbc; break;
case NID_des_ede3_cbc:
*cipher = &cipher_des_ede3_cbc; break;
case NID_desx_cbc:
*cipher = &cipher_desx_cbc; break;
default:
ok = 0;
*cipher = NULL;
break;
}
return ok;
}
static int rsaref_digests(ENGINE *e, const EVP_MD **digest,
const int **nids, int nid)
{
int ok = 1;
if(!digest)
{
/* We are returning a list of supported nids */
*nids = rsaref_digest_nids;
return (sizeof(rsaref_digest_nids)-1)/sizeof(rsaref_digest_nids[0]);
}
/* We are being asked for a specific digest */
switch (nid)
{
case NID_md2:
*digest = &digest_md2; break;
case NID_md5:
*digest = &digest_md5; break;
default:
ok = 0;
*digest = NULL;
break;
}
return ok;
}
/*****************************************************************************
* DES functions
**/
#undef data
#define data(ctx) ((DES_CBC_CTX *)(ctx)->cipher_data)
static int cipher_des_cbc_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
DES_CBCInit(data(ctx), (unsigned char *)key, (unsigned char *)iv, enc);
return 1;
}
static int cipher_des_cbc_code(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl)
{
int ret = DES_CBCUpdate(data(ctx), out, (unsigned char *)in, inl);
switch (ret)
{
case RE_LEN:
RSAREFerr(RSAREF_F_CIPHER_DES_CBC_CODE,RSAREF_R_LENGTH_NOT_BLOCK_ALIGNED);
break;
case 0:
break;
default:
RSAREFerr(RSAREF_F_CIPHER_DES_CBC_CODE,RSAREF_R_UNKNOWN_FAULT);
}
return !ret;
}
static int cipher_des_cbc_clean(EVP_CIPHER_CTX *ctx)
{
memset(data(ctx), 0, ctx->cipher->ctx_size);
return 1;
}
#undef data
#define data(ctx) ((DES3_CBC_CTX *)(ctx)->cipher_data)
static int cipher_des_ede3_cbc_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
DES3_CBCInit(data(ctx), (unsigned char *)key, (unsigned char *)iv,
enc);
return 1;
}
static int cipher_des_ede3_cbc_code(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl)
{
int ret = DES3_CBCUpdate(data(ctx), out, (unsigned char *)in, inl);
switch (ret)
{
case RE_LEN:
RSAREFerr(RSAREF_F_CIPHER_DES_CBC_CODE,RSAREF_R_LENGTH_NOT_BLOCK_ALIGNED);
break;
case 0:
break;
default:
RSAREFerr(RSAREF_F_CIPHER_DES_CBC_CODE,RSAREF_R_UNKNOWN_FAULT);
}
return !ret;
}
static int cipher_des_ede3_cbc_clean(EVP_CIPHER_CTX *ctx)
{
memset(data(ctx), 0, ctx->cipher->ctx_size);
return 1;
}
#undef data
#define data(ctx) ((DESX_CBC_CTX *)(ctx)->cipher_data)
static int cipher_desx_cbc_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
DESX_CBCInit(data(ctx), (unsigned char *)key, (unsigned char *)iv,
enc);
return 1;
}
static int cipher_desx_cbc_code(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, unsigned int inl)
{
int ret = DESX_CBCUpdate(data(ctx), out, (unsigned char *)in, inl);
switch (ret)
{
case RE_LEN:
RSAREFerr(RSAREF_F_CIPHER_DES_CBC_CODE,RSAREF_R_LENGTH_NOT_BLOCK_ALIGNED);
break;
case 0:
break;
default:
RSAREFerr(RSAREF_F_CIPHER_DES_CBC_CODE,RSAREF_R_UNKNOWN_FAULT);
}
return !ret;
}
static int cipher_desx_cbc_clean(EVP_CIPHER_CTX *ctx)
{
memset(data(ctx), 0, ctx->cipher->ctx_size);
return 1;
}
/*****************************************************************************
* MD functions
**/
#undef data
#define data(ctx) ((MD2_CTX *)(ctx)->md_data)
static int digest_md2_init(EVP_MD_CTX *ctx)
{
MD2Init(data(ctx));
return 1;
}
static int digest_md2_update(EVP_MD_CTX *ctx,const void *data,
unsigned long count)
{
MD2Update(data(ctx), (unsigned char *)data, (unsigned int)count);
return 1;
}
static int digest_md2_final(EVP_MD_CTX *ctx,unsigned char *md)
{
MD2Final(md, data(ctx));
return 1;
}
#undef data
#define data(ctx) ((MD5_CTX *)(ctx)->md_data)
static int digest_md5_init(EVP_MD_CTX *ctx)
{
MD5Init(data(ctx));
return 1;
}
static int digest_md5_update(EVP_MD_CTX *ctx,const void *data,
unsigned long count)
{
MD5Update(data(ctx), (unsigned char *)data, (unsigned int)count);
return 1;
}
static int digest_md5_final(EVP_MD_CTX *ctx,unsigned char *md)
{
MD5Final(md, data(ctx));
return 1;
}