Excuse me if my questions appear too obviuos for you.
This is my problem:
- I have my private key.
- I have a string.
- I have to sign this string with my private key using md5.
- I have made a small C program to do this.
I put here some lines of it:
<...>
EVP_MD_CTX ctx;
EVP_PKEY *pkey;
<...>
pkey = PEM_read_PrivateKey(fp,NULL,NULL,NULL);
EVP_SignInit(&ctx, EVP_md5());
EVP_SignUpdate(&ctx, data, strlen(data));
err = EVP_SignFinal (&ctx, buf, &slen, pkey);
<...>
Is this correct?
Just another question.
Having the same data (and obviously the same private key), the
signature (buf in the example), has to be always the same?
--
Cosimo Vagarini
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