45 lines
1.0 KiB
Go
45 lines
1.0 KiB
Go
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package dns
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import (
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"crypto/sha256"
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"crypto/sha512"
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"crypto/x509"
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"encoding/hex"
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"errors"
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"io"
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)
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// CertificateToDANE converts a certificate to a hex string as used in the TLSA or SMIMEA records.
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func CertificateToDANE(selector, matchingType uint8, cert *x509.Certificate) (string, error) {
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switch matchingType {
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case 0:
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switch selector {
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case 0:
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return hex.EncodeToString(cert.Raw), nil
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case 1:
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return hex.EncodeToString(cert.RawSubjectPublicKeyInfo), nil
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}
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case 1:
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h := sha256.New()
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switch selector {
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case 0:
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io.WriteString(h, string(cert.Raw))
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return hex.EncodeToString(h.Sum(nil)), nil
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case 1:
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io.WriteString(h, string(cert.RawSubjectPublicKeyInfo))
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return hex.EncodeToString(h.Sum(nil)), nil
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}
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case 2:
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h := sha512.New()
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switch selector {
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case 0:
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io.WriteString(h, string(cert.Raw))
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return hex.EncodeToString(h.Sum(nil)), nil
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case 1:
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io.WriteString(h, string(cert.RawSubjectPublicKeyInfo))
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return hex.EncodeToString(h.Sum(nil)), nil
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}
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}
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return "", errors.New("dns: bad MatchingType or Selector")
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}
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