61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
package vault
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import (
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"crypto/rand"
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"fmt"
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)
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// memzero is used to zero out a byte buffer. This specific format is optimized
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// by the compiler to use memclr to improve performance. See this code review:
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// https://codereview.appspot.com/137880043
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func memzero(b []byte) {
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for i := range b {
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b[i] = 0
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}
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}
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// randbytes is used to create a buffer of size n filled with random bytes
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func randbytes(n int) []byte {
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buf := make([]byte, n)
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if _, err := rand.Read(buf); err != nil {
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panic(fmt.Sprintf("failed to generate %d random bytes: %v", n, err))
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}
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return buf
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}
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// generateUUID is used to generate a random UUID
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func generateUUID() string {
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buf := make([]byte, 16)
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if _, err := rand.Read(buf); err != nil {
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panic(fmt.Errorf("failed to read random bytes: %v", err))
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}
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return fmt.Sprintf("%08x-%04x-%04x-%04x-%12x",
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buf[0:4],
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buf[4:6],
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buf[6:8],
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buf[8:10],
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buf[10:16])
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}
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// strListContains looks for a string in a list of strings.
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func strListContains(haystack []string, needle string) bool {
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for _, item := range haystack {
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if item == needle {
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return true
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}
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}
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return false
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}
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// strListSubset checks if a given list is a subset
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// of another set
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func strListSubset(super, sub []string) bool {
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for _, item := range sub {
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if !strListContains(super, item) {
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return false
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}
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}
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return true
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}
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