mirror of
https://github.com/outbackdingo/labca.git
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47 lines
897 B
Go
47 lines
897 B
Go
package main
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import (
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"crypto"
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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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"math/big"
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"os"
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)
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func issuerNameID(certfile string) (int64, error) {
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cf, err := ioutil.ReadFile(certfile)
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if err != nil {
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fmt.Printf("issuerNameID: could not read cert file: %v", err)
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return 0, err
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}
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cpb, _ := pem.Decode(cf)
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crt, err := x509.ParseCertificate(cpb.Bytes)
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if err != nil {
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fmt.Printf("issuerNameID: could not parse x509 file: %v", err)
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return 0, err
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}
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// From issuance/issuance.go : func truncatedHash
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h := crypto.SHA1.New()
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h.Write(crt.RawSubject)
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s := h.Sum(nil)
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return int64(big.NewInt(0).SetBytes(s[:7]).Int64()), nil
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}
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func main() {
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if len(os.Args[1:]) < 1 {
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fmt.Printf("Usage:\n %s <certificate.pem>\n", os.Args[0])
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os.Exit(1)
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}
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nameID, err := issuerNameID(os.Args[1])
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if err != nil {
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fmt.Printf("Error: %v\n", err)
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os.Exit(1)
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}
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fmt.Println(nameID)
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}
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