tcrasset opened a new issue, #38914:
URL: https://github.com/apache/arrow/issues/38914
### Describe the enhancement requested
In the C++ library, there is the notion of `uniform_encryption` in
`EncryptionConfiguration`, which allows to encrypt all the column and the
footer with the same encryption key. The other way is providing a list of
`column_keys` with their respective encryption key.
From `parquet/encryption/crypto_factory.h`:
```c++
struct PARQUET_EXPORT EncryptionConfiguration {
explicit EncryptionConfiguration(const std::string& footer_key)
: footer_key(footer_key) {}
/// ID of the master key for footer encryption/signing
std::string footer_key;
/// List of columns to encrypt, with master key IDs (see HIVE-21848).
/// Format: "masterKeyID:colName,colName;masterKeyID:colName..."
/// Either
/// (1) column_keys must be set
/// or
/// (2) uniform_encryption must be set to true
/// If none of (1) and (2) are true, or if both are true, an exception
will be
/// thrown.
std::string column_keys;
/// Encrypt footer and all columns with the same encryption key.
bool uniform_encryption = kDefaultUniformEncryption;
...
}
```
I'm using the Python wrapper around the C++ library, where
`uniform_encryption` is not yet present.
From `python/pyarrow/_parquet_encryption.pyx`:
```python
cdef class EncryptionConfiguration(_Weakrefable):
"""Configuration of the encryption, such as which columns to encrypt"""
# Avoid mistakingly creating attributes
__slots__ = ()
def __init__(self, footer_key, *, column_keys=None,
encryption_algorithm=None,
plaintext_footer=None, double_wrapping=None,
cache_lifetime=None, internal_key_material=None,
data_key_length_bits=None):
self.configuration.reset(
new CEncryptionConfiguration(tobytes(footer_key)))
if column_keys is not None:
self.column_keys = column_keys
if encryption_algorithm is not None:
self.encryption_algorithm = encryption_algorithm
if plaintext_footer is not None:
self.plaintext_footer = plaintext_footer
if double_wrapping is not None:
self.double_wrapping = double_wrapping
if cache_lifetime is not None:
self.cache_lifetime = cache_lifetime
if internal_key_material is not None:
self.internal_key_material = internal_key_material
if data_key_length_bits is not None:
self.data_key_length_bits = data_key_length_bits
```
The use-case I'm in requires to encrypt all the columns, however I don't
have the names of the columns, as I'm streaming the file from an external
source, chunk by chunk.
Would it be possible to add it to the python implementation?
### Component(s)
Parquet, Python
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