changkun wrote:
>
> In a test program, I call the function in OpenSSL0.9.5a
>
> HMAC(EVP_sha1(),secret,secret_len,seed,seed_len,a,&t_len);
> HMAC(EVP_sha1(),secret,secret_len,seed,seed_len,b,&b_len);
>
> the "secret" and "seed" are identical in two functions, but the output "a" and "b"
>are different. I think the "a" and "b" should be same.
> Who can tell me why the result is not same as I think?
>
They should be the same. Can you include your test program?
Steve.
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