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digest: add NewDigestFromBytes for completeness

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Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day 2016-01-06 17:24:58 -08:00
parent e63ad1e3d6
commit 9f5ebd0a94
1 changed files with 9 additions and 1 deletions
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10
digest/digest.go
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@ -28,7 +28,15 @@ type Digest string
// NewDigest returns a Digest from alg and a hash.Hash object. // NewDigest returns a Digest from alg and a hash.Hash object.
func NewDigest(alg Algorithm, h hash.Hash) Digest { func NewDigest(alg Algorithm, h hash.Hash) Digest {
return Digest(fmt.Sprintf("%s:%x", alg, h.Sum(nil))) return NewDigestFromBytes(alg, h.Sum(nil))
}
// NewDigestFromBytes returns a new digest from the byte contents of p.
// Typically, this can come from hash.Hash.Sum(...) or xxx.SumXXX(...)
// functions. This is also useful for rebuilding digests from binary
// serializations.
func NewDigestFromBytes(alg Algorithm, p []byte) Digest {
return Digest(fmt.Sprintf("%s:%x", alg, p))
} }
// NewDigestFromHex returns a Digest from alg and a the hex encoded digest. // NewDigestFromHex returns a Digest from alg and a the hex encoded digest.