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# Secure Remote Password submodule
This submodule provides the interface to the custom implementation of ProtonMail's SRP API.
It automatically tries to load the constant time ctypes + OpenSSL implementation,
and on failure it uses the native long int implementation.
It is based on [pysrp](https://github.com/cocagne/pysrp).
## Examples
### Authenticate against the API
```python
from proton.srp import User
usr = User(password, modulus)
client_challenge = usr.get_challenge()
# Get server challenge and user salt...
client_proof = usr.process_challenge(salt, server_challenge, version)
# Send client proof...
usr.verify_session(server_proof)
if usr.authenticated():
print("Logged in!")
```
### Generate new random verifier
```python
from proton.srp import User
usr = User(password, modulus)
generated_salt, generated_v = usr.compute_v()
```
### Generate verifier given salt
```python
from proton.srp import User
usr = User(password, modulus)
generated_salt, generated_v = usr.compute_v(salt)
```
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