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package timestamp
import (
"crypto"
"encoding/asn1"
)
// TODO(vanbroup): taken from "golang.org/x/crypto/ocsp"
// use directly from crypto/x509 when exported as suggested below.
var hashOIDs = map[crypto.Hash]asn1.ObjectIdentifier{
crypto.SHA1: asn1.ObjectIdentifier([]int{1, 3, 14, 3, 2, 26}),
crypto.SHA256: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 1}),
crypto.SHA384: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 2}),
crypto.SHA512: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 3}),
}
// TODO(rlb): This is not taken from crypto/x509, but it's of the same general form.
func getHashAlgorithmFromOID(target asn1.ObjectIdentifier) crypto.Hash {
for hash, oid := range hashOIDs {
if oid.Equal(target) {
return hash
}
}
return crypto.Hash(0)
}
func getOIDFromHashAlgorithm(target crypto.Hash) asn1.ObjectIdentifier {
for hash, oid := range hashOIDs {
if hash == target {
return oid
}
}
return nil
}
// TODO(vanbroup): taken from golang.org/x/crypto/x509
// asn1BitLength returns the bit-length of bitString by considering the
// most-significant bit in a byte to be the "first" bit. This convention
// matches ASN.1, but differs from almost everything else.
func asn1BitLength(bitString []byte) int {
bitLen := len(bitString) * 8
for i := range bitString {
b := bitString[len(bitString)-i-1]
for bit := uint(0); bit < 8; bit++ {
if (b>>bit)&1 == 1 {
return bitLen
}
bitLen--
}
}
return 0
}
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