55 lines
954 B
Go
55 lines
954 B
Go
package main
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import (
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"crypto/ecdsa"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"flag"
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"fmt"
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"os"
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"git.wntrmute.dev/kyle/goutils/die"
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)
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func main() {
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flag.Parse()
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for _, fileName := range flag.Args() {
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in, err := os.ReadFile(fileName)
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die.If(err)
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if p, _ := pem.Decode(in); p != nil {
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if p.Type != "CERTIFICATE REQUEST" {
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die.With("INVALID FILE TYPE")
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}
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in = p.Bytes
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}
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csr, err := x509.ParseCertificateRequest(in)
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die.If(err)
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out, err := x509.MarshalPKIXPublicKey(csr.PublicKey)
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die.If(err)
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var t string
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switch pub := csr.PublicKey.(type) {
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case *rsa.PublicKey:
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t = "RSA PUBLIC KEY"
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case *ecdsa.PublicKey:
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t = "EC PUBLIC KEY"
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default:
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die.With("unrecognised public key type %T", pub)
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}
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p := &pem.Block{
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Type: t,
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Bytes: out,
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}
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err = os.WriteFile(fileName+".pub", pem.EncodeToMemory(p), 0o644)
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die.If(err)
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fmt.Fprintf(os.Stdout, "[+] wrote %s.\n", fileName+".pub")
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}
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}
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