I have created EC Digital Signature and saved it in a file.
Excerpt of code shown below for a message digest md
unsigned int siglen = ECDSA_size(peckey);
printf("Max signature length is %d \n",siglen);
siglen = ECDSA_size(peckey);
unsigned char *ptr = OPENSSL_malloc(siglen);
unsigned char *save= ptr;
ECDSA_SIG *sig;
ret= ECDSA_sign(0 ,md, 20, ptr, &siglen, peckey); //Do sign it dude
if (!ret){
printf("ERROR signing null\n");
return 1;
}
printf(" Signature success \n");
printf("Signature length is %d \n",siglen);
/**
* Write out Digital Signature File
*
***/
strcpy(buffer,args[1]);
strcat(buffer,".ecdsa");
fp = fopen(buffer,"wb");
fwrite(save, 1, siglen, fp);
fclose(fp);
printf("OUTPUT signature file is %s\n\n",buffer);
And I use this signature file to verify a message digest later using a
public key.
ret = ECDSA_verify(0, md, 20, sig, siglen, pubeckey);
Everything works great. I want this signature to be in an X509 and open the
X509 and
extract it to use to verify things.
How do you place a signature in an X509 format and use code to extract them?
In the past I have created an X509 for public keys
before and extract the key to use it; and that works great to extract them
and use them.
So if anyone has a procedure for the using the API to do this let me know.
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