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package sri
import (
"fmt"
"strings"
)
// Parse a SRI hash
func Parse(sriHash string) (*Hash, error) {
elems := strings.SplitN(sriHash, "-", 2)
if len(elems) != 2 {
return nil, fmt.Errorf("sri: not a hash %v", sriHash)
}
// Get the algo
var algo Algo
switch elems[0] {
case string(SHA256):
algo = SHA256
case string(SHA384):
algo = SHA384
case string(SHA512):
algo = SHA512
default:
return nil, fmt.Errorf("sri: unsupported algo %s", elems[0])
}
// Get the hash
dbuf := make([]byte, b64Enc.DecodedLen(len(elems[1])))
n, err := b64Enc.Decode(dbuf, []byte(elems[1]))
if err != nil {
return nil, err
}
sum := dbuf[:n]
return &Hash{string(algo), sum}, nil
}
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