Argon2 CFFI Python API Docs | dltHub

Argon2 CFFI is a Python library exposing a programmatic API (no HTTP REST API). The REST API base URL is There is no base URL as Argon2 CFFI is a Python library, not a REST API. and There is no HTTP authentication as Argon2 CFFI is a Python library, not a REST API..

dlt is an open-source Python library that handles authentication, pagination, and schema evolution automatically. dlthub provides AI context files that enable code assistants to generate production-ready pipelines. Install with uv pip install "dlt[workspace]" and start loading Argon2 CFFI data in under 10 minutes.

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What data can I load from Argon2 CFFI?

Here are some of the endpoints you can load from Argon2 CFFI:

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How do I authenticate with the Argon2 CFFI API?

There is no HTTP authentication as Argon2 CFFI is a Python library, not a REST API.

1. Get your credentials

Credentials are not obtained from a provider's dashboard. Instead, use the Python package functions and classes directly by importing argon2.

2. Add them to .dlt/secrets.toml

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[sources.argon2_cffi_source]
Not applicable, as Argon2 CFFI is a Python library and does not use API keys in `secrets.toml`.

dlt reads this automatically at runtime — never hardcode tokens in your pipeline script. For production environments, see setting up credentials with dlt for environment variable and vault-based options.

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How do I set up and run the pipeline?

Set up a virtual environment and install dlt:

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uv venv && source .venv/bin/activate
uv pip install "dlt[workspace]"

1. Install the dlt AI Workbench:

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dlt ai init --agent <your-agent> # <agent>: claude | cursor | codex

This installs project rules, a secrets management skill, appropriate ignore files, and configures the dlt MCP server for your agent. Learn more →

2. Install the rest-api-pipeline toolkit:

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dlt ai toolkit rest-api-pipeline install

This loads the skills and context about dlt the agent uses to build the pipeline iteratively, efficiently, and safely. The agent uses MCP tools to inspect credentials — it never needs to read your secrets.toml directly. Learn more →

3. Start LLM-assisted coding:

Use /find-source to load data from the Argon2 CFFI API into DuckDB.

The rest-api-pipeline toolkit takes over from here — it reads relevant API documentation, presents you with options for which endpoints to load, and follows a structured workflow to scaffold, debug, and validate the pipeline step by step.

4. Run the pipeline:

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python argon2_cffi_pipeline.py

If everything is configured correctly, you'll see output like this:

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Pipeline argon2_cffi_pipeline load step completed in 0.26 seconds
1 load package(s) were loaded to destination duckdb and into dataset argon2_cffi_data
The duckdb destination used duckdb:/argon2_cffi.duckdb location to store data
Load package 1749667187.541553 is LOADED and contains no failed jobs

Inspect your pipeline and data:

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dlt pipeline argon2_cffi_pipeline show

This opens the Pipeline Dashboard where you can verify pipeline state, load metrics, schema (tables, columns, types), and query the loaded data directly.

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Python pipeline example

This example loads PasswordHasher and low_level functions from the Argon2 CFFI API into DuckDB. It mirrors the endpoint and data selector configuration from the table above:

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import dlt
from dlt.sources.rest_api import RESTAPIConfig, rest_api_resources

@dlt.source
def argon2_cffi_source(Not applicable, as Argon2 CFFI is a Python library and does not use `auth_param` in dlt source function signatures.=dlt.secrets.value):
    config: RESTAPIConfig = {
        "client": {
            "base_url": "There is no base URL as Argon2 CFFI is a Python library, not a REST API.",
            "auth": {
                "type": "Not applicable, as Argon2 CFFI is a Python library and does not use dlt `auth_type`.",
                "Not applicable, as Argon2 CFFI is a Python library and does not use `auth_token_key` in dlt auth config.": Not applicable, as Argon2 CFFI is a Python library and does not use `auth_param` in dlt source function signatures.,
            },
        },
        "resources": [
            {"name": "password_hasher", "endpoint": {"path": "PasswordHasher"}},
            {"name": "low_level_hash_secret", "endpoint": {"path": "argon2.low_level.hash_secret"}}
        ],
    }
    yield from rest_api_resources(config)


def get_data() -> None:
    pipeline = dlt.pipeline(
        pipeline_name="argon2_cffi_pipeline",
        destination="duckdb",
        dataset_name="argon2_cffi_data",
    )
    load_info = pipeline.run(argon2_cffi_source())
    print(load_info)

To add more endpoints, append entries from the resource table to the "resources" list using the same name, path, and data_selector pattern.

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How do I query the loaded data?

Once the pipeline runs, dlt creates one table per resource. You can query with Python or SQL.

Python (pandas DataFrame):

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import dlt

data = dlt.pipeline("argon2_cffi_pipeline").dataset()
sessions_df = data.password_hasher.df()
print(sessions_df.head())

SQL (DuckDB example):

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SELECT * FROM argon2_cffi_data.password_hasher LIMIT 10;

In a marimo or Jupyter notebook:

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import dlt

data = dlt.pipeline("argon2_cffi_pipeline").dataset()
data.password_hasher.df().head()

See how to explore your data in marimo Notebooks and how to query your data in Python with dataset.

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What destinations can I load Argon2 CFFI data to?

dlt supports loading into any of these destinations — only the destination parameter changes:

Change the destination in dlt.pipeline(destination="snowflake") and add credentials in .dlt/secrets.toml. See the full destinations list.

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Troubleshooting

Common Errors

When working with Argon2 CFFI, you may encounter the following exceptions:

• argon2.exceptions.VerifyMismatchError: Raised when the password does not match the hash during verification.
• argon2.exceptions.VerificationError: A general error indicating a problem during the verification process.
• argon2.exceptions.HashingError: Indicates an error occurred during the hashing process.
• argon2.exceptions.InvalidHashError: Raised when the provided hash string is not a valid Argon2 hash.
• argon2.exceptions.UnsupportedParametersError: Indicates that the parameters used for hashing are not supported.

Ensure that the API key is valid to avoid 401 Unauthorized errors. Also, verify endpoint paths and parameters to avoid 404 Not Found errors.

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Next steps

Continue your data engineering journey with the other toolkits of the dltHub AI Workbench:

• data-exploration — Build custom notebooks, charts, and dashboards for deeper analysis with marimo notebooks.
• dlthub-runtime — Deploy, schedule, and monitor your pipeline in production.

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dlt ai toolkit data-exploration install
dlt ai toolkit dlthub-runtime install

• How to deploy a pipeline
• How to explore your data in marimo Notebooks
• How to query your data in Python with dataset
• Join the dlt community on Slack