Add SSH agent support for age via plugin architecture #647
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This implementation adds SSH agent support to age through: 1. age-plugin-ssh-agent: Age plugin that communicates with SSH agents - Implements age plugin protocol (identity-v1) - Connects to SSH agents via SSH_AUTH_SOCK - Handles RSA and Ed25519 stanza parsing - Uses SSH agent extensions for decryption 2. simple-age-agent: Demonstration SSH agent with age extensions - Implements SSH agent interface with ExtendedAgent support - Performs RSA-OAEP decryption for ssh-rsa stanzas - Performs Ed25519/X25519 key agreement for ssh-ed25519 stanzas - Generates test keys for demonstration Key features: - Uses SSH agent extension mechanism (draft-miller-ssh-agent) - Extension names: [email protected], [email protected] - Complete cryptographic operations for both key types - Proper domain separation and security practices - Graceful fallback when extensions unsupported Usage: age -d -j ssh-agent encrypted-file.age
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