With signit you can authenticate strings with a cryptographically signature using HMAC-SHA256. To sign and/or validate a string, you need a pre-shared secret key.
The algorithm is the same as the one used for authenticating AWS requests (AWS Signature Version 4). An example of signing an AWS request is included in the test folder.
Here is an example of creating a hexdigest signature from signing two strings with a secret key:
import signit
secret_key = 'wfAlWbCePXJopHhB'
msg1 = 'A test message'
msg2 = 'Another test message'
signature = signit.sign(secret_key, msg1, msg2)
print('signature =', signature)
ok = signit.verify(signature, secret_key, msg1, msg2)
print('ok =', ok)
Running this program in Python 3 results in the following output:
signature = f0e1e79ce3d672d807c02558fd7dc394aef5b93f4b735a5d246b562ce761c953 ok = True
As seen from the function definitions, you can pass any number of strings to sign/validate:
sign(key, s, *args) verify(h, key, s, *args)
The package also contains variants of sign and verify for creating signatures as Base64 encoded hash values (instead of hexdigest):
sign_b64(key, s, *args) verify_b64(h, key, s, *args)
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