frostfs-api-go-pogpp/pkg/checksum.go

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package pkg
import (
"bytes"
"crypto/sha256"
"github.com/nspcc-dev/neofs-api-go/v2/refs"
)
// Checksum represents v2-compatible checksum.
type Checksum refs.Checksum
// ChecksumType represents the enumeration
// of checksum types.
type ChecksumType uint8
const (
// ChecksumUnknown is an undefined checksum type.
ChecksumUnknown ChecksumType = iota
// ChecksumSHA256 is a SHA256 checksum type.
ChecksumSHA256
// ChecksumTZ is a Tillich-Zemor checksum type.
ChecksumTZ
)
// NewChecksumFromV2 wraps v2 Checksum message to Checksum.
func NewChecksumFromV2(cV2 *refs.Checksum) *Checksum {
return (*Checksum)(cV2)
}
// NewVersion creates and initializes blank Version.
//
// Works similar as NewVersionFromV2(new(Version)).
func NewChecksum() *Checksum {
return NewChecksumFromV2(new(refs.Checksum))
}
// GetType returns checksum type.
func (c *Checksum) GetType() ChecksumType {
switch (*refs.Checksum)(c).GetType() {
case refs.SHA256:
return ChecksumSHA256
case refs.TillichZemor:
return ChecksumTZ
default:
return ChecksumUnknown
}
}
// GetSum returns checksum bytes.
func (c *Checksum) GetSum() []byte {
return (*refs.Checksum)(c).GetSum()
}
// SetSHA256 sets checksum to SHA256 hash.
func (c *Checksum) SetSHA256(v [sha256.Size]byte) {
checksum := (*refs.Checksum)(c)
checksum.SetType(refs.SHA256)
checksum.SetSum(v[:])
}
// SetTillichZemor sets checksum to Tillich-Zemor hash.
func (c *Checksum) SetTillichZemor(v [64]byte) {
checksum := (*refs.Checksum)(c)
checksum.SetType(refs.TillichZemor)
checksum.SetSum(v[:])
}
func (c *Checksum) ToV2() *refs.Checksum {
return (*refs.Checksum)(c)
}
func EqualChecksums(cs1, cs2 *Checksum) bool {
return cs1.GetType() == cs2.GetType() && bytes.Equal(cs1.GetSum(), cs2.GetSum())
}