51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
package main
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import (
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"crypto/x509"
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"encoding/pem"
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"fmt"
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"io/ioutil"
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"os"
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)
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func main() {
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if len(os.Args) < 2 {
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fmt.Fprintln(os.Stderr, "usage: inspect <cert.pem>")
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os.Exit(2)
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}
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data, err := ioutil.ReadFile(os.Args[1])
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if err != nil {
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panic(err)
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}
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for {
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var block *pem.Block
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block, data = pem.Decode(data)
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if block == nil {
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break
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}
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if block.Type != "CERTIFICATE" {
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continue
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}
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cert, err := x509.ParseCertificate(block.Bytes)
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if err != nil {
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fmt.Fprintf(os.Stderr, "parse error: %v\n", err)
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continue
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}
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fmt.Println("-----")
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fmt.Printf("Subject: %s\n", cert.Subject.String())
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fmt.Printf("Issuer: %s\n", cert.Issuer.String())
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fmt.Printf("Serial: %s\n", cert.SerialNumber.String())
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fmt.Printf("NotBefore: %s\n", cert.NotBefore)
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fmt.Printf("NotAfter: %s\n", cert.NotAfter)
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if len(cert.DNSNames) > 0 {
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fmt.Printf("DNS SANs: %v\n", cert.DNSNames)
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}
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if len(cert.URIs) > 0 {
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fmt.Printf("URI SANs: %v\n", cert.URIs)
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}
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fmt.Printf("Signature Algorithm: %s\n", cert.SignatureAlgorithm)
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fmt.Printf("Public Key Algorithm: %s\n", cert.PublicKeyAlgorithm)
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}
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}
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