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hash: docs and argument

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Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
This commit is contained in:
Vincent Batts 2017-04-07 15:03:28 -04:00
parent b3f5e06c4d
commit 416e4e85ab
Signed by: vbatts
GPG key ID: 10937E57733F1362
2 changed files with 10 additions and 9 deletions
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13
hash/hash.go
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@ -14,11 +14,12 @@ func init() {
rand.Seed(time.Now().UnixNano())
}
// Rand64 is an int64 random number
func Rand64() int64 {
return rand.Int63()
}
/* Convinience method for getting md5 sum of a string */
// GetMd5FromString is a convinience method for getting md5 sum of a string
func GetMd5FromString(blob string) (sum []byte) {
h := md5.New()
defer h.Reset()
@ -26,7 +27,7 @@ func GetMd5FromString(blob string) (sum []byte) {
return h.Sum(nil)
}
/* Convinience method for getting md5 sum of some bytes */
// GetMd5FromBytes is a convinience method for getting md5 sum of some bytes
func GetMd5FromBytes(blob []byte) (sum []byte) {
h := md5.New()
defer h.Reset()
@ -34,9 +35,9 @@ func GetMd5FromBytes(blob []byte) (sum []byte) {
return h.Sum(nil)
}
/* get a small, decently unique hash */
func GetSmallHash() (small_hash string) {
// GetSmallHash get a small, decently unique hash
func GetSmallHash(num uint) string {
h := sha256.New()
io.WriteString(h, fmt.Sprintf("%d%d", Rand64()))
return strings.ToLower(fmt.Sprintf("%X", h.Sum(nil)[0:4]))
io.WriteString(h, fmt.Sprintf("%d%d", Rand64(), Rand64()))
return strings.ToLower(fmt.Sprintf("%X", h.Sum(nil)[0:num]))
}