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package id
import (
"crypto/sha1" //#nosec:G505
"crypto/sha256"
"hash"
)
type algorithmDetails struct {
name string
size int
sum func([]byte) ObjectID
new func() hash.Hash
}
func (algo Algorithm) details() algorithmDetails {
return algorithmTable[algo]
}
//nolint:gochecknoglobals
var algorithmTable = [...]algorithmDetails{
AlgorithmUnknown: {}, //nolint:exhaustruct
AlgorithmSHA1: {
name: "sha1",
size: sha1.Size,
sum: func(data []byte) ObjectID {
sum := sha1.Sum(data) //#nosec G401
var id ObjectID
copy(id.data[:], sum[:])
id.algo = AlgorithmSHA1
return id
},
new: sha1.New,
},
AlgorithmSHA256: {
name: "sha256",
size: sha256.Size,
sum: func(data []byte) ObjectID {
sum := sha256.Sum256(data)
var id ObjectID
copy(id.data[:], sum[:])
id.algo = AlgorithmSHA256
return id
},
new: sha256.New,
},
}
// maxObjectIDSize MUST be >= the largest supported algorithm size.
const maxObjectIDSize = sha256.Size
var (
//nolint:gochecknoglobals
algorithmByName = map[string]Algorithm{}
//nolint:gochecknoglobals
supportedAlgorithms []Algorithm
)
func init() { //nolint:gochecknoinits
// Skip over AlgorithmUnknown.
for algo := Algorithm(1); int(algo) < len(algorithmTable); algo++ {
info := &algorithmTable[algo]
algorithmByName[info.name] = algo
supportedAlgorithms = append(supportedAlgorithms, algo)
}
}
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