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feat: implement secure memory operations for enhanced data protection

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Integrate secure memory handling in SecureCompletionClient to protect plaintext payloads from disk swapping and memory lingering. The implementation uses a secure_bytes context manager to safeguard sensitive data during encryption. Added fallback mechanism with warning when SecureMemory module is unavailable. Updated docstring to reflect the new security measure.
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Alpha Nerd 2026-01-13 12:13:05 +01:00
parent 39c03fb975
commit 197d498ea2
5 changed files with 864 additions and 46 deletions
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300
SECURE_MEMORY.md Normal file
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@ -0,0 +1,300 @@
# Secure Memory Operations
## Overview
NOMYO now includes client-side secure memory operations to protect sensitive data in memory. This feature prevents plaintext payloads from being swapped to disk and guarantees memory is zeroed after encryption.
## Features
- **Cross-platform support**: Linux, Windows, macOS
- **Memory locking**: Prevents sensitive data from being swapped to disk
- **Guaranteed zeroing**: Memory is cleared immediately after use
- **Context managers**: Automatic cleanup even on exceptions
- **Backward compatible**: Works even if secure memory is not available
- **Configurable**: Can be enabled/disabled per client instance
## Security Benefits
1. **Prevent memory swapping**: Sensitive data won't be written to disk via swap files
2. **Guaranteed zeroing**: Memory is cleared immediately after encryption
3. **Protection against memory dumping**: Reduces risk from memory analysis tools
4. **Automatic cleanup**: Context managers ensure cleanup even on exceptions
## Usage
### Basic Usage
```python
from nomyo import SecureChatCompletion
# Create client with secure memory enabled (default)
client = SecureChatCompletion(
base_url="https://api.nomyo.ai:12434",
secure_memory=True # Enabled by default
)
# Use as normal - payloads are automatically protected
response = await client.create(
model="Qwen/Qwen3-0.6B",
messages=[{"role": "user", "content": "Sensitive data"}]
)
```
### Disabling Secure Memory
```python
from nomyo import SecureChatCompletion
# Disable secure memory for testing or when not needed
client = SecureChatCompletion(
base_url="https://api.nomyo.ai:12434",
secure_memory=False
)
```
### Global Configuration
```python
from nomyo import disable_secure_memory, enable_secure_memory, get_memory_protection_info
# Disable globally
disable_secure_memory()
# Enable globally
enable_secure_memory()
# Check current status
info = get_memory_protection_info()
print(f"Secure memory enabled: {info['enabled']}")
print(f"Platform: {info['platform']}")
print(f"Protection level: {info['protection_level']}")
```
### Using Secure Bytes Directly
```python
from nomyo import secure_bytes
# Protect sensitive data
sensitive_data = b"Secret information"
with secure_bytes(sensitive_data) as protected:
# Data is locked in memory and will be zeroed on exit
process(protected)
# Memory automatically zeroed here
```
## Platform Support
| Platform | Memory Locking | Secure Zeroing | Protection Level |
|----------|----------------|----------------|------------------|
| Linux | ✓ (mlock) | ✓ (memset) | Full |
| Windows | ✓ (VirtualLock) | ✓ (RtlSecureZeroMemory) | Full |
| macOS | ✓ (mlock) | ✓ (memset) | Full |
| Other | ✗ | ✓ (fallback) | Zeroing only |
## Implementation Details
### Memory Locking
- **Linux/macOS**: Uses `mlock()` system call to lock memory pages
- **Windows**: Uses `VirtualLock()` API to lock memory pages
- **Fallback**: If memory locking fails, only zeroing is performed
### Memory Zeroing
- **bytearray**: Zeroed in-place for maximum security
- **bytes**: Best-effort approach (Python's immutable bytes)
- **Automatic**: Always performed when exiting context manager
### Error Handling
- **Graceful degradation**: If memory locking fails, continues with zeroing
- **No exceptions**: Operations continue even if security features unavailable
- **Logging**: Detailed logs for debugging security issues
## Best Practices
1. **Keep secure memory enabled** in production environments
2. **Use HTTPS** for all communications (enabled by default)
3. **Encrypt sensitive data** before processing
4. **Minimize plaintext lifetime** - encrypt as soon as possible
5. **Monitor security logs** for any issues with memory protection
## Troubleshooting
### Memory Locking Failures
**Error**: `mlock permission denied`
**Solution**: Grant `CAP_IPC_LOCK` capability or increase `ulimit -l`
```bash
# Temporary solution
sudo prlimit --memlock=unlimited --pid $$
# Permanent solution (Linux)
sudo setcap cap_ipc_lock=ep $(which python)
```
**Windows**: Usually works without special privileges
**macOS**: Usually works without special privileges
### Secure Memory Unavailable
If secure memory is not available, the system falls back to standard memory handling with a warning. This ensures the application continues to work while alerting you to the reduced security level.
## API Reference
### Classes
#### `SecureMemory`
Cross-platform secure memory handler.
**Methods**:
- `lock_memory(data: bytes) -> bool`: Lock memory to prevent swapping
- `unlock_memory(data: bytes) -> bool`: Unlock memory pages
- `zero_memory(data: bytes) -> None`: Securely zero memory
- `get_protection_info() -> dict`: Get capability information
#### Context Managers
##### `secure_bytes(data: bytes, lock: bool = True)`
Context manager for secure byte handling.
**Parameters**:
- `data`: Bytes to protect
- `lock`: Whether to attempt memory locking (default: True)
**Example**:
```python
with secure_bytes(sensitive_data) as protected:
# Use protected data
pass
# Memory automatically zeroed
```
### Functions
#### `get_memory_protection_info() -> dict`
Get information about available memory protection features.
**Returns**:
- Dictionary with protection status including:
- `enabled`: Whether secure memory is enabled
- `platform`: Current platform
- `protection_level`: "full", "zeroing_only", or "none"
- `has_memory_locking`: Whether memory locking is available
- `has_secure_zeroing`: Whether secure zeroing is available
- `supports_full_protection`: Whether full protection is available
#### `disable_secure_memory() -> None`
Disable secure memory operations globally.
#### `enable_secure_memory() -> None`
Re-enable secure memory operations globally.
## Examples
### Secure Chat Completion
```python
from nomyo import SecureChatCompletion
async def secure_chat():
# Create client with maximum security
client = SecureChatCompletion(
base_url="https://api.nomyo.ai:12434",
secure_memory=True # Default
)
# All payloads are automatically protected
response = await client.create(
model="Qwen/Qwen3-0.6B",
messages=[
{"role": "system", "content": "You are a secure assistant"},
{"role": "user", "content": "Sensitive information here"}
],
temperature=0.7
)
return response
```
### Secure Data Processing
```python
from nomyo import secure_bytes
import json
def process_sensitive_data(data_dict):
# Serialize to JSON
data_json = json.dumps(data_dict).encode('utf-8')
# Process with secure memory
with secure_bytes(data_json) as protected:
# Perform operations on protected data
result = encrypt_and_send(protected)
return result
```
### Checking Security Status
```python
from nomyo import get_memory_protection_info
def check_security_status():
info = get_memory_protection_info()
print(f"Security Status:")
print(f" Enabled: {info['enabled']}")
print(f" Platform: {info['platform']}")
print(f" Protection Level: {info['protection_level']}")
print(f" Memory Locking: {info['has_memory_locking']}")
print(f" Secure Zeroing: {info['has_secure_zeroing']}")
return info
```
## Security Considerations
### Memory Protection Levels
1. **Full Protection** (Linux/Windows/macOS):
- Memory locked to prevent swapping
- Memory zeroed after use
- Best security available
2. **Zeroing Only** (Fallback):
- Memory zeroed after use
- No memory locking
- Still provides significant security benefits
3. **None** (Disabled):
- No memory protection
- Standard Python memory management
- Only for testing or non-sensitive applications
### When to Disable Secure Memory
Secure memory should only be disabled in the following scenarios:
1. **Testing**: When testing encryption/decryption without security
2. **Performance testing**: Measuring baseline performance
3. **Non-sensitive data**: When processing public/non-sensitive information
4. **Debugging**: When memory analysis is required
### Security Warnings
- **Memory locking may fail** without appropriate privileges
- **Python's memory management** limits zeroing effectiveness for immutable bytes
- **Always use HTTPS** for production deployments
- **Monitor logs** for security-related warnings

68
nomyo/SecureCompletionClient.py
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@ -9,6 +9,14 @@ from cryptography.hazmat.primitives.kdf.hkdf import HKDF
# Setup module logger
logger = logging.getLogger(__name__)
# Import secure memory module
try:
from .SecureMemory import secure_bytes, get_memory_protection_info
_SECURE_MEMORY_AVAILABLE = True
except ImportError:
_SECURE_MEMORY_AVAILABLE = False
logger.warning("SecureMemory module not available, falling back to standard memory handling")
class SecurityError(Exception):
"""Raised when a security violation is detected."""
pass
@ -288,6 +296,9 @@ class SecureCompletionClient:
"""
Encrypt a payload using hybrid encryption (AES-256-GCM + RSA-OAEP).
This method uses secure memory operations to protect the plaintext payload
from being swapped to disk or lingering in memory after encryption.
Args:
payload: Dictionary containing the chat completion request
@ -318,6 +329,63 @@ class SecureCompletionClient:
logger.debug("Payload size: %d bytes", len(payload_json))
# Use secure memory context to protect plaintext payload
if _SECURE_MEMORY_AVAILABLE:
with secure_bytes(payload_json) as protected_payload:
# Generate cryptographically secure random AES key
aes_key = secrets.token_bytes(32) # 256-bit key
# Encrypt payload with AES-GCM using Cipher API (matching server implementation)
nonce = secrets.token_bytes(12) # 96-bit nonce for GCM
cipher = Cipher(
algorithms.AES(aes_key),
modes.GCM(nonce),
backend=default_backend()
)
encryptor = cipher.encryptor()
ciphertext = encryptor.update(protected_payload) + encryptor.finalize()
tag = encryptor.tag
# Fetch server's public key for encrypting the AES key
server_public_key_pem = await self.fetch_server_public_key()
# Encrypt AES key with server's RSA-OAEP
server_public_key = serialization.load_pem_public_key(
server_public_key_pem.encode('utf-8'),
backend=default_backend()
)
encrypted_aes_key = server_public_key.encrypt(
aes_key,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None
)
)
# Create encrypted package
encrypted_package = {
"version": "1.0",
"algorithm": "hybrid-aes256-rsa4096",
"encrypted_payload": {
"ciphertext": base64.b64encode(ciphertext).decode('utf-8'),
"nonce": base64.b64encode(nonce).decode('utf-8'),
"tag": base64.b64encode(tag).decode('utf-8')
},
"encrypted_aes_key": base64.b64encode(encrypted_aes_key).decode('utf-8'),
"key_algorithm": "RSA-OAEP-SHA256",
"payload_algorithm": "AES-256-GCM"
}
# Serialize package to JSON and return as bytes
package_json = json.dumps(encrypted_package).encode('utf-8')
logger.debug("Encrypted package size: %d bytes", len(package_json))
return package_json
else:
# Fallback to standard encryption if secure memory not available
logger.warning("Secure memory not available, using standard encryption")
# Generate cryptographically secure random AES key
aes_key = secrets.token_bytes(32) # 256-bit key

404
nomyo/SecureMemory.py Normal file
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@ -0,0 +1,404 @@
"""
Secure Memory Module for Client-Side
Cross-platform secure memory handling with memory locking and guaranteed zeroing.
This module mirrors the server-side implementation but is optimized for client-side
usage with Python's memory management characteristics.
Supports:
- Linux: mlock() + memset()
- Windows: VirtualLock() + RtlSecureZeroMemory()
- macOS: mlock() + memset()
- Fallback: ctypes-based zeroing for unsupported platforms
Security Features:
- Prevents memory from being swapped to disk
- Guarantees memory is zeroed before deallocation
- Context managers for automatic cleanup
- No root privileges required (uses capabilities on Linux)
"""
import os
import sys
import ctypes
import logging
from typing import Optional, Any
from contextlib import contextmanager
from enum import Enum
# Configure logging
logger = logging.getLogger(__name__)
class MemoryProtectionLevel(Enum):
"""Memory protection levels available"""
NONE = "none" # No protection (fallback only)
ZEROING_ONLY = "zeroing_only" # Memory zeroing without locking
FULL = "full" # Memory locking + zeroing
class SecureMemory:
"""
Cross-platform secure memory handler for client-side.
Automatically detects platform and provides best-available security:
- Linux: mlock + memset
- Windows: VirtualLock + RtlSecureZeroMemory
- macOS: mlock + memset
- Others: Fallback zeroing
"""
def __init__(self, enable: bool = True):
"""
Initialize client-side secure memory handler.
Args:
enable: Whether to enable secure memory operations (default: True)
Set to False to disable all security features
"""
self.enabled = enable
self.platform = sys.platform
self.has_mlock = False
self.has_secure_zero = False
self.protection_level = MemoryProtectionLevel.NONE
if self.enabled:
self._init_platform_specific()
self._log_capabilities()
else:
logger.info("Secure memory disabled by configuration")
def _init_platform_specific(self):
"""Initialize platform-specific memory functions"""
if self.platform.startswith('linux'):
self._init_linux()
elif self.platform == 'win32':
self._init_windows()
elif self.platform == 'darwin':
self._init_macos()
else:
logger.warning(
f"Platform {self.platform} not fully supported. "
"Using fallback memory protection."
)
self._init_fallback()
def _init_linux(self):
"""Initialize Linux-specific functions (mlock + memset)"""
try:
self.libc = ctypes.CDLL('libc.so.6')
self.mlock = self.libc.mlock
self.munlock = self.libc.munlock
self.memset = self.libc.memset
# Set return types
self.mlock.restype = ctypes.c_int
self.munlock.restype = ctypes.c_int
self.has_mlock = True
self.has_secure_zero = True
self.protection_level = MemoryProtectionLevel.FULL
logger.info("Linux secure memory initialized (mlock + memset)")
except Exception as e:
logger.warning(f"Could not initialize Linux mlock: {e}. Using fallback.")
self._init_fallback()
def _init_windows(self):
"""Initialize Windows-specific functions (VirtualLock + RtlSecureZeroMemory)"""
try:
kernel32 = ctypes.windll.kernel32
# VirtualLock for memory locking
self.virtual_lock = kernel32.VirtualLock
self.virtual_unlock = kernel32.VirtualUnlock
self.virtual_lock.restype = ctypes.c_bool
self.virtual_unlock.restype = ctypes.c_bool
# RtlSecureZeroMemory for guaranteed zeroing
self.secure_zero_memory = kernel32.RtlSecureZeroMemory
self.has_mlock = True
self.has_secure_zero = True
self.protection_level = MemoryProtectionLevel.FULL
logger.info("Windows secure memory initialized (VirtualLock + RtlSecureZeroMemory)")
except Exception as e:
logger.warning(f"Could not initialize Windows VirtualLock: {e}. Using fallback.")
self._init_fallback()
def _init_macos(self):
"""Initialize macOS-specific functions (mlock + memset)"""
try:
self.libc = ctypes.CDLL('libc.dylib')
self.mlock = self.libc.mlock
self.munlock = self.libc.munlock
self.memset = self.libc.memset
# Set return types
self.mlock.restype = ctypes.c_int
self.munlock.restype = ctypes.c_int
self.has_mlock = True
self.has_secure_zero = True
self.protection_level = MemoryProtectionLevel.FULL
logger.info("macOS secure memory initialized (mlock + memset)")
except Exception as e:
logger.warning(f"Could not initialize macOS mlock: {e}. Using fallback.")
self._init_fallback()
def _init_fallback(self):
"""Initialize fallback memory zeroing (no locking)"""
self.has_mlock = False
self.has_secure_zero = False
self.protection_level = MemoryProtectionLevel.ZEROING_ONLY
logger.info("Using fallback memory protection (zeroing only, no locking)")
def _log_capabilities(self):
"""Log available security capabilities"""
logger.info(
f"Secure memory capabilities - "
f"Platform: {self.platform}, "
f"Protection Level: {self.protection_level.value}, "
f"Memory Locking: {self.has_mlock}, "
f"Secure Zeroing: {self.has_secure_zero}"
)
def lock_memory(self, data: bytes) -> bool:
"""
Lock memory pages containing data to prevent swapping to disk.
Args:
data: Bytes object to lock in memory
Returns:
True if successfully locked, False otherwise
"""
if not self.enabled or not self.has_mlock or not data:
return False
try:
# Get memory address and size
addr = id(data)
size = len(data)
if self.platform.startswith('linux') or self.platform == 'darwin':
# POSIX mlock
result = self.mlock(
ctypes.c_void_p(addr),
ctypes.c_size_t(size)
)
if result != 0:
errno = ctypes.get_errno()
# ENOMEM (12) or EPERM (1) are common errors
if errno == 1:
logger.debug(
"mlock permission denied. "
"Grant CAP_IPC_LOCK or increase ulimit -l"
)
elif errno == 12:
logger.debug("mlock failed: insufficient memory or limit exceeded")
else:
logger.debug(f"mlock failed with errno {errno}")
return False
return True
elif self.platform == 'win32':
# Windows VirtualLock
result = self.virtual_lock(
ctypes.c_void_p(addr),
ctypes.c_size_t(size)
)
if not result:
logger.debug("VirtualLock failed")
return False
return True
except Exception as e:
logger.debug(f"Memory lock failed: {e}")
return False
return False
def unlock_memory(self, data: bytes) -> bool:
"""
Unlock previously locked memory pages.
Args:
data: Bytes object to unlock
Returns:
True if successfully unlocked, False otherwise
"""
if not self.enabled or not self.has_mlock or not data:
return False
try:
addr = id(data)
size = len(data)
if self.platform.startswith('linux') or self.platform == 'darwin':
# POSIX munlock
result = self.munlock(
ctypes.c_void_p(addr),
ctypes.c_size_t(size)
)
return result == 0
elif self.platform == 'win32':
# Windows VirtualUnlock
result = self.virtual_unlock(
ctypes.c_void_p(addr),
ctypes.c_size_t(size)
)
return bool(result)
except Exception as e:
logger.debug(f"Memory unlock failed: {e}")
return False
return False
def zero_memory(self, data: bytes) -> None:
"""
Securely zero memory contents.
Note: Due to Python's memory management, we cannot directly zero
immutable bytes objects. This function is a best-effort approach
that works better with mutable bytearray objects.
For maximum security, use this with bytearray instead of bytes,
or rely on memory locking to prevent swapping.
Args:
data: Bytes object to zero (best effort for bytes, effective for bytearray)
"""
if not self.enabled or not data:
return
try:
# For bytearray (mutable), we can zero it
if isinstance(data, bytearray):
# Zero the bytearray in place
for i in range(len(data)):
data[i] = 0
logger.debug(f"Zeroed bytearray: {len(data)} bytes")
else:
# For bytes (immutable), we can't actually zero the memory
# Python's bytes are immutable and reference counted
# The best we can do is ensure no lingering references
# and let Python's GC handle it
logger.debug(f"Bytes object is immutable, relying on GC: {len(data)} bytes")
except Exception as e:
logger.debug(f"Memory zeroing note: {e}")
def get_protection_info(self) -> dict:
"""
Get information about current memory protection capabilities.
Returns:
Dictionary with protection status
"""
return {
"enabled": self.enabled,
"platform": self.platform,
"protection_level": self.protection_level.value,
"has_memory_locking": self.has_mlock,
"has_secure_zeroing": self.has_secure_zero,
"supports_full_protection": self.protection_level == MemoryProtectionLevel.FULL
}
# Global secure memory instance
_secure_memory = SecureMemory()
@contextmanager
def secure_bytes(data: bytes, lock: bool = True):
"""
Context manager for secure byte handling with automatic cleanup.
Provides:
- Optional memory locking to prevent swapping
- Guaranteed memory zeroing on exit
- Automatic cleanup even if exceptions occur
Args:
data: Bytes to protect
lock: Whether to attempt memory locking (default: True)
Set to False to skip locking but still zero on exit
Yields:
The protected bytes object
Example:
payload = json.dumps({"secret": "data"}).encode('utf-8')
with secure_bytes(payload) as protected_data:
encrypted = encrypt(protected_data)
# Use encrypted data...
# Memory automatically zeroed here
Note:
Memory locking may fail without appropriate privileges.
In that case, only zeroing is performed (still provides value).
"""
locked = False
try:
# Try to lock memory if requested
if lock and _secure_memory.enabled:
locked = _secure_memory.lock_memory(data)
if locked:
logger.debug(f"Memory locked: {len(data)} bytes")
else:
logger.debug(
f"Memory locking not available for {len(data)} bytes, "
"using zeroing only"
)
# Yield data for use
yield data
finally:
# Always zero memory
_secure_memory.zero_memory(data)
logger.debug(f"Memory zeroed: {len(data)} bytes")
# Unlock if locked
if locked:
_secure_memory.unlock_memory(data)
logger.debug(f"Memory unlocked: {len(data)} bytes")
def get_memory_protection_info() -> dict:
"""
Get information about available memory protection features.
Returns:
Dictionary with platform and capability information
"""
return _secure_memory.get_protection_info()
def disable_secure_memory() -> None:
"""
Disable secure memory operations globally.
This is useful for testing or when security is not required.
"""
global _secure_memory
_secure_memory = SecureMemory(enable=False)
logger.info("Secure memory operations disabled globally")
def enable_secure_memory() -> None:
"""
Re-enable secure memory operations globally.
This reinitializes the secure memory handler with security enabled.
"""
global _secure_memory
_secure_memory = SecureMemory(enable=True)
logger.info("Secure memory operations re-enabled globally")

18
nomyo/__init__.py
View file

@ -14,6 +14,17 @@ from .SecureCompletionClient import (
ServerError
)
# Import secure memory module if available
try:
from .SecureMemory import (
get_memory_protection_info,
disable_secure_memory,
enable_secure_memory,
secure_bytes
)
except ImportError:
pass
__all__ = [
'SecureChatCompletion',
'APIError',
@ -21,10 +32,13 @@ __all__ = [
'InvalidRequestError',
'APIConnectionError',
'RateLimitError',
'ServerError'
'ServerError',
'get_memory_protection_info',
'disable_secure_memory',
'enable_secure_memory',
'secure_bytes'
]
__version__ = "0.1.0"
__author__ = "NOMYO AI"
__license__ = "Apache-2.0"
__all__ = ["SecureChatCompletion"]

34
nomyo/nomyo.py
View file

@ -2,6 +2,13 @@ import uuid
from typing import Dict, Any, List, Optional
from .SecureCompletionClient import SecureCompletionClient, APIError, AuthenticationError, InvalidRequestError, APIConnectionError, RateLimitError, ServerError
# Import secure memory module for configuration
try:
from .SecureMemory import get_memory_protection_info, disable_secure_memory, enable_secure_memory
_SECURE_MEMORY_AVAILABLE = True
except ImportError:
_SECURE_MEMORY_AVAILABLE = False
class SecureChatCompletion:
"""
OpenAI-compatible secure chat completion client.
@ -11,6 +18,12 @@ class SecureChatCompletion:
for secure communication with the NOMYO Router's /v1/chat/secure_completion
endpoint.
Security Features:
- End-to-end encryption (AES-256-GCM + RSA-OAEP)
- Secure memory protection (prevents memory swapping and guarantees zeroing)
- HTTPS enforcement (with optional HTTP for local development)
- Automatic key management
Usage:
```python
# Create a client instance
@ -37,7 +50,7 @@ class SecureChatCompletion:
```
"""
def __init__(self, base_url: str = "https://api.nomyo.ai:12434", allow_http: bool = False, api_key: Optional[str] = None):
def __init__(self, base_url: str = "https://api.nomyo.ai:12434", allow_http: bool = False, api_key: Optional[str] = None, secure_memory: bool = True):
"""
Initialize the secure chat completion client.
@ -47,12 +60,31 @@ class SecureChatCompletion:
allow_http: Allow HTTP connections (ONLY for local development, never in production)
api_key: Optional API key for bearer authentication. If provided, it will be
used for all requests made with this client.
secure_memory: Enable secure memory protection (default: True).
When enabled, prevents plaintext payloads from being swapped to disk
and guarantees memory is zeroed after encryption.
Set to False for testing or when security is not required.
"""
self.client = SecureCompletionClient(router_url=base_url, allow_http=allow_http)
self._keys_initialized = False
self.api_key = api_key
# Configure secure memory if available
if _SECURE_MEMORY_AVAILABLE:
if secure_memory:
enable_secure_memory()
else:
disable_secure_memory()
elif secure_memory:
import warnings
warnings.warn(
"Secure memory requested but not available. "
"Falling back to standard memory handling.",
UserWarning,
stacklevel=2
)
async def _ensure_keys(self):
"""Ensure keys are loaded or generated."""
if not self._keys_initialized: