Initial commit.

LICENSE

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+MIT License
+
+Copyright (c) 2016 Grant Ayers
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Certificate Information for Go
+
+A golang tool for printing x509 TLS certificates in a format similar to OpenSSL.
+
+## Installation
+
+``` bash
+go get github.com/grantae/certinfo
+```
+
+## Usage
+
+### Print a certificate from a website
+
+``` go
+package main
+
+import (
+ "crypto/tls"
+ "fmt"
+ "github.com/grantae/certinfo"
+ "log"
+)
+
+func main() {
+ // Connect to google.com
+ cfg := tls.Config{}
+ conn, err := tls.Dial("tcp", "google.com:443", &cfg)
+ if err != nil {
+ log.Fatalln("TLS connection failed: " + err.Error())
+ }
+ // Grab the last certificate in the chain
+ certChain := conn.ConnectionState().PeerCertificates
+ cert := certChain[len(certChain)-1]
+
+ // Print the certificate
+ result, err := certinfo.CertificateText(cert)
+ if err != nil {
+ log.Fatal(err)
+ }
+ fmt.Print(result)
+}
+```
+
+### Print a PEM-encoded certificate from a file
+
+``` go
+package main
+
+import (
+ "crypto/x509"
+ "encoding/pem"
+ "fmt"
+ "github.com/grantae/certinfo"
+ "io/ioutil"
+ "log"
+)
+
+func main() {
+ // Read and parse the PEM certificate file
+ pemData, err := ioutil.ReadFile("cert.pem")
+ if err != nil {
+ log.Fatal(err)
+ }
+ block, rest := pem.Decode([]byte(pemData))
+ if block == nil || len(rest) > 0 {
+ log.Fatal("Certificate decoding error")
+ }
+ cert, err := x509.ParseCertificate(block.Bytes)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ // Print the certificate
+ result, err := certinfo.CertificateText(cert)
+ if err != nil {
+ log.Fatal(err)
+ }
+ fmt.Print(result)
+}
+```
+
+## Testing
+
+``` bash
+go test github.com/grantae/certinfo
+```
+
+This compares several PEM-encoded certificates with their expected outputs.
+
+## License
+
+MIT -- see `LICENSE` for more information.
+