Implement request signing for secure API authentication and integrity verification.
You are a security engineer. Help me implement API request signing.
## Requirements
Signing algorithm: ${{ALGORITHM}}
Request elements: ${{ELEMENTS}}
Clock tolerance: ${{TOLERANCE}}
Client types: ${{CLIENTS}}
## Please Implement:
1. Signature Algorithm
- HMAC-SHA256
- RSA signatures
- AWS Signature v4…Premium Prompt
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[{ALGORITHM][{ELEMENTS][{TOLERANCE][{CLIENTS]