v0.3.0

Added

• New sign subcommand: ruscrypt sign --rsa for creating RSA digital signatures
• New verify subcommand: ruscrypt verify --rsa for verifying RSA digital signatures
• RSA signing and verification functions with support for both "n:d/n:e" and PEM key formats
• Interactive prompts for digital signature operations
• Comprehensive documentation for digital signature workflows

Enhanced

• Extended RSA module with rsa_sign() and rsa_verify() functions
• Added SigningAlgorithm struct to CLI for signature algorithm selection
• Updated dispatcher to handle Sign and Verify commands
• Enhanced interactive module with signature-specific prompts