38 lines
938 B
Go
38 lines
938 B
Go
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package fingerprint
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import (
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"crypto"
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"errors"
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)
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var errInvalidHashAlgorithm = errors.New("fingerprint: invalid hash algorithm")
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func nameToHash() map[string]crypto.Hash {
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return map[string]crypto.Hash{
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"md5": crypto.MD5, // [RFC3279]
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"sha-1": crypto.SHA1, // [RFC3279]
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"sha-224": crypto.SHA224, // [RFC4055]
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"sha-256": crypto.SHA256, // [RFC4055]
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"sha-384": crypto.SHA384, // [RFC4055]
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"sha-512": crypto.SHA512, // [RFC4055]
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}
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}
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// HashFromString allows looking up a hash algorithm by it's string representation
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func HashFromString(s string) (crypto.Hash, error) {
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if h, ok := nameToHash()[s]; ok {
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return h, nil
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}
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return 0, errInvalidHashAlgorithm
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}
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// StringFromHash allows looking up a string representation of the crypto.Hash.
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func StringFromHash(hash crypto.Hash) (string, error) {
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for s, h := range nameToHash() {
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if h == hash {
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return s, nil
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}
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}
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return "", errInvalidHashAlgorithm
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}
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