set cert [::pki::x509::parse_cert $cert]
		}]} {
			return ""
		}

		set e [format %llx [dict get $cert e]]
		set n [format %llx [dict get $cert n]]

		# Pad to even size for hex width
		if {[string length $e] % 2 != 0} {
			set e "0$e"
		}
		if {[string length $n] % 2 != 0} {
			set n "0$n"
		}
		if {[string length $n] % 4 == 0} {

		# Add a leading zero if the value is high enough
		if {"0x[string range $n 0 1]" > 0x7f} {
			set n "00$n"
		}

		set retval "\{
			\"publicKey\": \{
				\"type\":\"[string toupper [dict get $cert type]]\",
				\"e\":\"$e\",