Hi,
I have a problem with ECDSA private key that is preventing my progress. So
please help if you can. Here is the setup:
I have an ECDSA private key in the form of a 32 byte unsigned char array, and a
data that needs to be signed using that key. So I wrote the following code to
load the key and use it to sign my data:
unsigned char tempkey[100]; // buffer for the EC key
int hdrlen = 31;
int ftrlen = 32;
memcpy(tempkey,"-----BEGIN EC PRIVATE KEY-----\n",hdrlen); // This is
supposedly the required header
memcpy(&tempkey[hdrlen],m_Private_key,32); //m_Private_key is a 32 byte
unsigned char array
memcpy(&tempkey[hdrlen+32],"==\n-----END EC PRIVATE KEY-----\n",ftrlen); //
This is supposedly the
// required footer
tempkey[hdrlen+32+ftrlen] = 0; // NULL terminate just in case
BIO* in;
EC_KEY *pkey;
in=BIO_new_mem_buf(tempkey,hdrlen+ftrlen+32);
pkey=PEM_read_bio_ECPrivateKey(in, NULL, NULL, NULL); //Try to get an EC_KEY
from tempkey
And right there, pkey is returned to me as NULL. Does anyone know why this
happen? Please advise me if you can. Because if it works fine, I can sign my
data as follow:
ECDSA_SIG *signature = ECDSA_do_sign(data_pointer,data_length, pkey);
So please tell me what I did wrong. Thank you so much.
