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dotfiles/bin/.bin/rekey

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#!/usr/bin/env bash
set -euo pipefail
USER="${USER:-$(whoami)}"
HOST="${HOST:-$(hostname)}"
DATE="$(date +%F)"
SSH_DIR="$HOME/.ssh"
mkdir -p "$SSH_DIR"
PASS_PATH="personal/ssh/$USER@$HOST/$DATE"
# --- Temporary RAM-backed file for private key ---
TMP_PRIV="/dev/shm/sshkey_$USER@$HOST$DATE"
trap 'rm -f "$TMP_PRIV"' EXIT
# Generate Ed25519 key pair into RAM
ssh-keygen -t ed25519 -f "$TMP_PRIV" -N "" -q
# Insert private key into pass
cat "$TMP_PRIV" | pass insert --multiline --force "$PASS_PATH"
echo "Private key stored in pass at $PASS_PATH"
# Extract public key from the same temp file
ssh-keygen -y -f "$TMP_PRIV" > "$SSH_DIR/$USER@$HOST.pub"
echo "Public key written to $SSH_DIR/$USER@$HOST.pub"
# Private key removed from /dev/shm automatically