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parse.go
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/
parse.go
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package internal
import (
"crypto/x509"
"encoding/pem"
"fmt"
"go.mozilla.org/pkcs7"
"golang.org/x/crypto/pkcs12"
)
func ParseCertificate(data []byte, format string) (*Certificate, error) {
switch format {
case "pem":
return parsePEM(data)
case "der":
c, err := x509.ParseCertificate(data)
if err != nil {
return nil, fmt.Errorf("failed to parse DER: %v", err)
}
return NewCertificate(c), nil
case "p7c":
p7, err := pkcs7.Parse(data)
if err != nil {
return nil, fmt.Errorf("failed to parse P7C: %v", err)
}
cert := NewCertificate(p7.Certificates[0])
for _, c := range p7.Certificates[1:] {
cert.AddCertificateToChain(NewCertificate(c))
}
return cert, nil
case "pfx":
_, crt, err := pkcs12.Decode(data, "")
if err != nil {
return nil, fmt.Errorf("failed to parse PKCS#12: %v", err)
}
return NewCertificate(crt), nil
case "", "cer", "crt":
c, err := ParseCertificate(data, "der")
if err != nil {
c, err = ParseCertificate(data, "pem")
if err != nil {
return nil, fmt.Errorf("data is neither DER or PEM")
}
}
return c, nil
default:
return nil, fmt.Errorf("unknown format %q", format)
}
}
func parsePEM(data []byte) (*Certificate, error) {
var cert *Certificate
block, rest := pem.Decode(data)
for block != nil {
if block.Type == "CERTIFICATE" {
c, err := ParseCertificate(block.Bytes, "der")
if err != nil {
return nil, fmt.Errorf("failed to parse PEM: %v", err)
}
if cert == nil {
cert = c
} else {
cert.AddCertificateToChain(c)
}
}
block, rest = pem.Decode(rest)
}
if cert == nil {
return nil, fmt.Errorf("failed to parse PEM: no CERTIFICATE block found")
}
return cert, nil
}