Hi Dave,
Thank you so much for your reply. I have been struggling with this issue
for while. And I tried your method, but I got a problem with
EC_KEY_new_by_curve_name: it always return NULL. Here is how I used it:
EC_KEY *eckey = EC_KEY_new_by_curve_name(NID_ecdsa_with_SHA256);
If(eckey == NULL)
{
Printf("ERROR: NULL ECKEY!\r\n");
}
Do you happen to know the reason? And to answer your question about my
32-uchar array private key: I don't know yet. Another person gave me that
private key and asked me to use it to sign the data. I will try to find
out more about that. But for now, can you please advise on the previous
NULL eckey issue? Again, thanks a lot.
Regards,
Chuong D. Khuc
On 5/21/12 9:38 PM, "Dave Thompson" <dthomp...@prinpay.com> wrote:
>>From: owner-openssl-us...@openssl.org On Behalf Of Khuc, Chuong D.
>>Sent: Friday, 18 May, 2012 17:22
>
>>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:
><snip: add PEM header/footer>
>>in=BIO_new_mem_buf(tempkey,hdrlen+ftrlen+32);
>>pkey=PEM_read_bio_ECPrivateKey(in, NULL, NULL, NULL);
>
>>And right there, pkey is returned to me as NULL. <snip>
>>So please tell me what I did wrong. Thank you so much.
>
>What exactly is in your 32-uchar array? It can't possibly be
>a PEM-body or even DER encoding of OpenSSL's ECPrivateKey,
>which is minimum 112 chars or 82 bytes respectively.
>
>It would be the right size to be the raw priv_key value for
>some 256-bit curve, perhaps secp256k1 which is fairly common.
>If so, it appears to me you can use EC_KEY_new_by_curve_name
>and put your privkey in a bignum and use EC_KEY_set_private_key.
>
>
>______________________________________________________________________
>OpenSSL Project http://www.openssl.org
>User Support Mailing List openssl-users@openssl.org
>Automated List Manager majord...@openssl.org
______________________________________________________________________
OpenSSL Project http://www.openssl.org
User Support Mailing List openssl-users@openssl.org
Automated List Manager majord...@openssl.org
