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hash.go
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hash.go
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package hash
import (
"encoding/hex"
"fmt"
"strings"
)
type Algorithm string
const (
hashStringSeparator string = "="
)
type sumFunc func(in []byte) []byte
var sumProviders map[Algorithm]sumFunc = map[Algorithm]sumFunc{}
func registerProvider(alg Algorithm, provider sumFunc) {
sumProviders[alg] = provider
}
func ToHashString(alg Algorithm, source any) (string, error) {
sum, found := sumProviders[alg]
if !found {
return "", fmt.Errorf("hash algorithm %s not found", alg)
}
encode, err := getEncoder(source)
if err != nil {
return "", err
}
b, err := encode(source)
if err != nil {
return "", err
}
hashBytes := sum(b)
return joinToHashString(alg, hex.EncodeToString(hashBytes)), nil
}
func CompareWithHashString(source any, targetHashString string) (bool, error) {
alg := extractAlgorithmFromHashString(targetHashString)
sourceHashString, err := ToHashString(alg, source)
if err != nil {
return false, err
}
return targetHashString == sourceHashString, nil
}
func joinToHashString(alg Algorithm, hash string) string {
return fmt.Sprintf("%s%s%s", alg, hashStringSeparator, hash)
}
func extractAlgorithmFromHashString(hashString string) Algorithm {
parts := strings.Split(hashString, hashStringSeparator)
if len(parts) != 2 {
return ""
}
return Algorithm(parts[0])
}