Verify x509 certificates

cert.go

package main
 
import (
        "crypto/x509"
        "encoding/pem"
        "fmt"
        "log"
)
 
func main() {
        const cert = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`

        block, _ := pem.Decode([]byte(cert))
        if block == nil {
                log.Fatal("no block")
        }
        if block.Type != "CERTIFICATE" || len(block.Headers) != 0 {
                log.Fatalf("Bogus: %#v", block)
        }

        _, err := x509.ParseCertificate(block.Bytes)
        if err != nil {
                log.Fatalf("ParseCertificate: %v", err)
        }
        fmt.Println("ok")
}