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crypto: add GenerateIV from random IV generation (#6215)

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This commit adds a `GenerateIV` function to simplify
the generation of random IVs.

It adds some unit tests for `GenerateIV` in key_test.go
This commit is contained in:
Andreas Auernhammer
2018-08-01 10:02:07 +02:00
committed by kannappanr
parent 8e6d756e3a
commit 76c423392a
2 changed files with 41 additions and 2 deletions
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17
cmd/crypto/key.go
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@@ -35,8 +35,8 @@ import (
type ObjectKey [32]byte
// GenerateKey generates a unique ObjectKey from a 256 bit external key
// and a source of randomness. If random is nil the default PRNG of system
// (crypto/rand) is used.
// and a source of randomness. If random is nil the default PRNG of the
// system (crypto/rand) is used.
func GenerateKey(extKey [32]byte, random io.Reader) (key ObjectKey) {
if random == nil {
random = rand.Reader
@@ -52,6 +52,19 @@ func GenerateKey(extKey [32]byte, random io.Reader) (key ObjectKey) {
return key
}
// GenerateIV generates a new random 256 bit IV from the provided source
// of randomness. If random is nil the default PRNG of the system
// (crypto/rand) is used.
func GenerateIV(random io.Reader) (iv [32]byte) {
if random == nil {
random = rand.Reader
}
if _, err := io.ReadFull(random, iv[:]); err != nil {
logger.CriticalIf(context.Background(), errOutOfEntropy)
}
return iv
}
// SealedKey represents a sealed object key. It can be stored
// at an untrusted location.
type SealedKey struct {