diff --git a/.zshrc b/.zshrc
index 30fd82a..67f34fa 100644
--- a/.zshrc
+++ b/.zshrc
@@ -1,3 +1,26 @@
+# ssh key loading.
+env=~/.ssh/agent.env
+ 
+agent_load_env () { test -f "$env" && . "$env" >| /dev/null ; }
+ 
+agent_start () {
+    (umask 077; ssh-agent >| "$env")
+    . "$env" >| /dev/null ; }
+ 
+agent_load_env
+ 
+# agent_run_state: 0=agent running w/ key; 1=agent w/o key; 2= agent not running
+agent_run_state=$(ssh-add -l >| /dev/null 2>&1; echo $?)
+ 
+if [ ! "$SSH_AUTH_SOCK" ] || [ $agent_run_state = 2 ]; then
+    agent_start
+    ssh-add
+elif [ "$SSH_AUTH_SOCK" ] && [ $agent_run_state = 1 ]; then
+    ssh-add
+fi
+ 
+unset env
+
 # Enable Powerlevel10k instant prompt. Should stay close to the top of ~/.zshrc.
 # Initialization code that may require console input (password prompts, [y/n]
 # confirmations, etc.) must go above this block; everything else may go below.
@@ -110,3 +133,4 @@ source $HOME/.aliases
 
 # To customize prompt, run `p10k configure` or edit ~/.p10k.zsh.
 [[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh
+