mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
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54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
package libp2pwebrtc
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import (
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"crypto"
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"crypto/x509"
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"errors"
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ma "github.com/multiformats/go-multiaddr"
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"github.com/multiformats/go-multibase"
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mh "github.com/multiformats/go-multihash"
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"github.com/pion/webrtc/v3"
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)
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// parseFingerprint is forked from pion to avoid bytes to string alloc,
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// and to avoid the entire hex interspersing when we do not need it anyway
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var errHashUnavailable = errors.New("fingerprint: hash algorithm is not linked into the binary")
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// parseFingerprint creates a fingerprint for a certificate using the specified hash algorithm
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func parseFingerprint(cert *x509.Certificate, algo crypto.Hash) ([]byte, error) {
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if !algo.Available() {
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return nil, errHashUnavailable
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}
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h := algo.New()
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// Hash.Writer is specified to be never returning an error.
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// https://golang.org/pkg/hash/#Hash
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h.Write(cert.Raw)
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return h.Sum(nil), nil
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}
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func decodeRemoteFingerprint(maddr ma.Multiaddr) (*mh.DecodedMultihash, error) {
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remoteFingerprintMultibase, err := maddr.ValueForProtocol(ma.P_CERTHASH)
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if err != nil {
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return nil, err
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}
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_, data, err := multibase.Decode(remoteFingerprintMultibase)
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if err != nil {
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return nil, err
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}
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return mh.Decode(data)
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}
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func encodeDTLSFingerprint(fp webrtc.DTLSFingerprint) (string, error) {
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digest, err := decodeInterspersedHexFromASCIIString(fp.Value)
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if err != nil {
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return "", err
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}
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encoded, err := mh.Encode(digest, mh.SHA2_256)
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if err != nil {
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return "", err
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}
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return multibase.Encode(multibase.Base64url, encoded)
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}
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