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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
package fingerprint
import (
"crypto"
"errors"
"strings"
)
var errInvalidHashAlgorithm = errors.New("fingerprint: invalid hash algorithm")
func nameToHash() map[string]crypto.Hash {
return map[string]crypto.Hash{
"md5": crypto.MD5, // [RFC3279]
"sha-1": crypto.SHA1, // [RFC3279]
"sha-224": crypto.SHA224, // [RFC4055]
"sha-256": crypto.SHA256, // [RFC4055]
"sha-384": crypto.SHA384, // [RFC4055]
"sha-512": crypto.SHA512, // [RFC4055]
}
}
// HashFromString allows looking up a hash algorithm by it's string representation.
func HashFromString(s string) (crypto.Hash, error) {
if h, ok := nameToHash()[strings.ToLower(s)]; ok {
return h, nil
}
return 0, errInvalidHashAlgorithm
}
// StringFromHash allows looking up a string representation of the crypto.Hash.
func StringFromHash(hash crypto.Hash) (string, error) {
for s, h := range nameToHash() {
if h == hash {
return s, nil
}
}
return "", errInvalidHashAlgorithm
}
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