From dad3ab27b702dc237bc99a9a55882a75410ff9ba Mon Sep 17 00:00:00 2001
From: Christopher Denny <cdenny@squareup.com>
Date: Fri, 27 May 2016 11:34:35 -0700
Subject: [PATCH] first few files, main.go can work with .pem files that have
 just certs in them. Sample .pem and .jceks included as well

---
 main.go | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 main.go

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..793e5e1
--- /dev/null
+++ b/main.go
@@ -0,0 +1,69 @@
+package main
+
+import (
+	"crypto/x509"
+	"encoding/hex"
+	"encoding/pem"
+	"fmt"
+	"io/ioutil"
+)
+
+func main() {
+	data, _ := ioutil.ReadFile("service2service.ca.pem")
+	block, data := pem.Decode(data)
+	for block != nil {
+		cert, _ := x509.ParseCertificates(block.Bytes)
+		displayCert(cert[0])
+		block, data = pem.Decode(data)
+	}
+}
+
+func displayCert(cert *x509.Certificate) {
+
+	//Expiry Date
+	fmt.Println("Expiry Date:", cert.NotAfter)
+
+	//Algorithm
+	fmt.Println("Algorithm Type:", cert.SignatureAlgorithm)
+
+	//Subject Info
+	fmt.Println("Subject Info:")
+	fmt.Println("	CommonName:", cert.Subject.CommonName)
+	fmt.Println("	Organization:", cert.Subject.Organization)
+	fmt.Println("	OrganizationalUnit:", cert.Subject.OrganizationalUnit)
+	fmt.Println("	Country:", cert.Subject.Country)
+	fmt.Println("	Locality:", cert.Subject.Locality)
+
+	//Issuer Info
+	fmt.Println("Issuer Info:")
+	fmt.Println("	CommonName:", cert.Issuer.CommonName)
+	fmt.Println("	Organization:", cert.Issuer.Organization)
+	fmt.Println("	OrganizationalUnit:", cert.Issuer.OrganizationalUnit)
+	fmt.Println("	Country:", cert.Issuer.Country)
+	fmt.Println("	Locality:", cert.Issuer.Locality)
+
+	//Subject Key ID
+	fmt.Print("Subject Key ID: ")
+	for i := 0; i < len(cert.SubjectKeyId); i++ {
+		fmt.Print(hex.EncodeToString(cert.SubjectKeyId[i : i+1]))
+		if i < len(cert.SubjectKeyId)-1 {
+			fmt.Print(":")
+		}
+	}
+
+	//Authority Key ID
+	fmt.Print("\nAuthority Key ID: ")
+	for i := 0; i < len(cert.AuthorityKeyId); i++ {
+		fmt.Print(hex.EncodeToString(cert.AuthorityKeyId[i : i+1]))
+		if i < len(cert.AuthorityKeyId)-1 {
+			fmt.Print(":")
+		}
+	}
+
+	//SANs, (alternate DNS Names)
+	fmt.Println("\nAlternate DNS Names:", cert.DNSNames)
+
+	//Serial Number
+	fmt.Println("Serial Number:", cert.SerialNumber)
+	fmt.Println("\n")
+}