sqrl.crypto module

class sqrl.crypto.Ed25519(public_key, private_key, msg)

Bases: object

Utility class for signing and verifying ed25519 signatures.

More information about ed25519 can be found at http://ed25519.cr.yp.to/.

Parameters:

• public_key (bytes) – Key used for verifying signature.
• private_key (bytes) – Key used for signing data.
• msg (bytes) – Binary data for which to generate the signature.

is_signature_valid(other_signature)

Check if other_signature is a valid signature for the provided message.

Returns:Boolean indicating whether validation has succeeded. Return type:bool

sign_data()

Generate ed25519 signature for the provided data.

Returns:ed25519 signature Return type:bytes

class sqrl.crypto.HMAC(nut, data)

Bases: object

Utility class for generating and verifying HMAC signatures.

This class relies on Django’s built in salted_hmac() to compute actual HMAC values by using SECRET_KEY as key.

Parameters:

• nut (SQRLNut) – Nut from which necessary data is extracted to add a salt value to the HMAC input data. Currently only models.SQRLNut.session_key is used.
• data (OrderedDict) – Dict for which to either compute or validate HMAC signature.

is_signature_valid(other_signature)

Check if the other_signature is a valid signature for the provided data and the nut.

Returns:Boolean indicating whether validation has succeeded. Return type:bool

sign_data()

Generate HMAC signature for the provided data.

Note

max key is ignored in the input data if that key is present.

Returns:Binary signature of the data Return type:bytes

sqrl.crypto.generate_randomness(bytes=32)

Generate random sample of specified size bytes.

Parameters:bytes (int, optional) – Number of bytes to generate random sample Returns:Base64.encode() encoded random sample Return type:str