diff --git a/bootstrap.sh b/bootstrap.sh
index 0e5cc90..c4e365a 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -14,6 +14,7 @@ test -L $HOME/.gitignore || ln -f -s $BASEDIR/gitignore $HOME/.gitignore
 test -L $HOME/.hushlogin || ln -f -s $BASEDIR/hushlogin $HOME/.hushlogin
 test -d $HOME/.ncmpcpp || mkdir $HOME/.ncmpcpp
 test -L $HOME/.ncmpcpp/config || ln -f -s $BASEDIR/ncmpcpp $HOME/.ncmpcpp/config
+test -L $HOME/.functions.zsh || ln -f -s $BASEDIR/functions.zsh $HOME/.functions.zsh
 test -L $HOME/.zshrc || ln -f -s $BASEDIR/zshrc $HOME/.zshrc
 
 # ln vim files
diff --git a/functions.zsh b/functions.zsh
new file mode 100644
index 0000000..4038253
--- /dev/null
+++ b/functions.zsh
@@ -0,0 +1,29 @@
+#!/usr/bin/env zsh
+
+# Functions
+
+# Generate TLS certs using a local CA
+gencert () {
+    DOMAIN=$1
+
+    test -d /Users/jonny/Development/localCA && ROOT='/Users/jonny/Development/localCA'
+    test -d /home/jonny/git/ca && ROOT='/home/jonny/git/ca'
+    test -d /usr/local/opt/openssl@1.1/bin && PATH='/usr/local/opt/openssl@1.1/bin':$PATH
+    test -f /usr/local/etc/openssl@1.1/openssl.cnf && SSLCNF='/usr/local/etc/openssl@1.1/openssl.cnf'
+    test -f /etc/ssl/openssl.cnf && SSLCNF='/etc/ssl/openssl.cnf'
+
+    cd $ROOT
+    [[ ! -d $DOMAIN ]] && mkdir $DOMAIN
+    cd $DOMAIN
+    [[ -f key ]] && mv key key.bak
+    [[ -f csr ]] && mv csr csr.bak
+    [[ -f crt ]] && mv crt crt.bak
+
+    openssl ecparam -name secp384r1 -genkey -noout -out key
+    chmod 644 key
+    openssl req -new -sha256 -key key -subj "/C=UK/ST=England/L=Darwen/O=JMB Dev Ltd/CN=$DOMAIN" -reqexts SAN -config <(cat $SSLCNF <(printf "[SAN]\nsubjectAltName=DNS:$DOMAIN")) -out csr
+    openssl x509 -req -in csr -extfile <(cat $SSLCNF <(printf "[SAN]\nsubjectAltName=DNS:$DOMAIN")) -extensions SAN -CA ../jmb-ca-ecc.pem -CAkey ../jmb-ca-ecc.key -CAcreateserial -days 90 -sha256 -out crt
+
+    cd $HOME
+    echo 'Certs generated for $DOMAIN'
+}
\ No newline at end of file
diff --git a/zshrc b/zshrc
index d9b8fbe..092ee5c 100644
--- a/zshrc
+++ b/zshrc
@@ -190,4 +190,7 @@ export LS_COLORS='di=33;40:ln=35;40:so=32;40:pi=33;40:ex=31;40:bd=34;46:cd=34;43
 # They are packaged correctly for Arch Linux
 test "$platform" = 'osx' && fpath=(/usr/local/share/zsh-completions $fpath)
 
+# Source my own functions
+test -e $HOME/.functions.zsh && source $HOME/.functions.zsh
+
 test -e ${HOME}/.iterm2_shell_integration.zsh && source ${HOME}/.iterm2_shell_integration.zsh