SHA secret key problem

[baicaihenxiao]

I know how to use SHA256 to handle a string like this:

char s[HASH_LEN];
sha256 sh;

shs256_init(&sh);

for (i=0;;i++)
{
    if (string[i]==0) break;
    shs256_process(&sh,string[i]);
}
shs256_hash(&sh,s);

But I don't know how to set the SHA256' secret key, whether can I set it in the program? Thank you very much for any help

[mcarrickscott]

Hello,

Sha256 is a one way hash function. It does not have a secret key,

Mike

On Sunday 30 October 2016, baicaihenxiao notifications@github.com wrote:

I know how to use SHA256 to handle a string like this:

char s[HASH_LEN]; sha256 sh;

shs256_init(&sh);

for (i=0;;i++) { if (string[i]==0) break; shs256_process(&sh,string[i]); } shs256_hash(&sh,s);

But I don't know how to set the SHA256' secret key, whether can I set it in the program? Thank you very much for any help

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[baicaihenxiao]

Thank you, I think I have confused HMAC and SHA.