Hi,
I am new to the openssl . I am trying to use the
Harware Crypto for Mod exp calculations. So to make
use of the hardware capability I am getting the RSA
METHOD by using 'RSA_get_default_method' and updating
the function pointer of the member bn_mod_exp of the
RSA_METHOD structure with my own function. It can be
explained with pseudo code as follows
Init(...)
{
DH_METHOD *pDHMeth = NULL;
RSA_METHOD *pRSAMethod = NULL;
pDHMeth = DH_get_default_method();
pDHMeth->bn_mod_exp = DHmodexp;
pRSAMethod = RSA_get_default_method();
pRSAMethod->bn_mod_exp = RSAmodexp;
}
DhModexp( const DH *pDH,BIGNUM *r, const BIGNUM *a,
const BIGNUM *p,
const BIGNUM *m, BN_CTX
*ctx,
BN_MONT_CTX *m_ctx)
)
{
return ModExp(r,a,p,m,ctx,m_ctx);
}
RsaModExp(BIGNUM *r, const BIGNUM *a,
const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx,
BN_MONT_CTX *m_ctx)
)
{
return ModExp(r,a,p,m,ctx,m_ctx);
}
/* Inputs: a - The base
* p - The exponent
* m - The modulus
* ctx - The BIGNUM context structure.
* in_mont - The Montgomerry methods context
*
* Output: rr - The result of the mod-exp operation.
* Return value: 1 on success and -1 on failure.
*/
ModExp(BIGNUM *r, const BIGNUM *a,
const BIGNUM *p,
const BIGNUM *m, BN_CTX
*ctx,
BN_MONT_CTX *m_ctx)
{
/**doing some validations and invoking the hardware
provided API for Mod exp calculation and
converting the result back to big number format**/
}
The above method works fine for DH related operations
but it is not working for RSA related operations,if I
generate a key pair and try to sign and verify then it
fails.(Hardware Mod exp API returns no error) So
Please let me know is the above method a correct
approach or else is there any other technique to hook
up the Hardware Mod exp routine into openssl.(Assume
there is no engine interface enabled and I am using
the openssl version "OpenSSL 0.9.7c 30 Sep 2003")
Thanks in advance!
regards
Tom
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