Currently I am reading a PEM file which contains a test RSA key
/**
*Load RSA Keys
**/
fp= fopen("test.pem", "rb");
if (fp==NULL){
printf("ERROR opening RSA Keys failed test.pem\n");
return 1;
}
rsapriv= (RSA *) PEM_read_RSAPrivateKey(fp,&rsapriv, (pem_password_cb
*)"password",NULL);
and create a SHA1 message digest
unsigned char *result=SHA1((unsigned char *)sample, strlen(sample), md);
and sign it
int rc= RSA_sign(NID_sha1, md, 20, sigret, &siglen, rsapriv);
Now I have explored also the use of the Elliptical Curve from the SHA1
but and there is always a but, the only example I could figure out is
using the key generation function
EC_KEY_generate_key(eckey); <====
I need to use my private and public key from the RSA PEM file?
Not sure how exactly to do this.
The private would be used for the
ECDSA_do_sign(md, 20, eckey);
The public later is used for verify
ECDSA_do_verify(md, 20, sig, eckey);
The RSA structure consists of several BIGNUM components. It can contain
public as well as private RSA keys:
struct
{
BIGNUM *n; // public modulus
BIGNUM *e; // public exponent
BIGNUM *d; // private exponent
BIGNUM *p; // secret prime factor
BIGNUM *q; // secret prime factor
BIGNUM *dmp1; // d mod (p-1)
BIGNUM *dmq1; // d mod (q-1)
BIGNUM *iqmp; // q^-1 mod p
// ...
};
RSA
There are functions for ECDSA such as
int EC_KEY_set_private_key(EC_KEY *, const BIGNUM *)
and
int EC_KEY_set_public_key(EC_KEY *, const EC_POINT *)
EC_POINT_point2bn(group, point, POINT_CONVERSION_UNCOMPRESSED, ppub_a,
ctx);
The POINT is used for the public key of EC_KEY no real document of how this
is used.
So simply I have a PEM which gives me a RSA* and want to use the public and
privates keys
for the ECDSA.
How?
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