mirror of https://github.com/vbatts/imgsrv.git
44 lines
867 B
Go
44 lines
867 B
Go
package hash
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import (
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"crypto/md5"
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"crypto/sha256"
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"fmt"
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"io"
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"math/rand"
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"strings"
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"time"
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)
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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// Rand64 is an int64 random number
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func Rand64() int64 {
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return rand.Int63()
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}
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// GetMd5FromString is a convinience method for getting md5 sum of a string
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func GetMd5FromString(blob string) (sum []byte) {
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h := md5.New()
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defer h.Reset()
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io.WriteString(h, blob)
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return h.Sum(nil)
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}
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// GetMd5FromBytes is a convinience method for getting md5 sum of some bytes
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func GetMd5FromBytes(blob []byte) (sum []byte) {
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h := md5.New()
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defer h.Reset()
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h.Write(blob)
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return h.Sum(nil)
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}
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// GetSmallHash get a small, decently unique hash
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func GetSmallHash(num uint) string {
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h := sha256.New()
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io.WriteString(h, fmt.Sprintf("%d%d", Rand64(), Rand64()))
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return strings.ToLower(fmt.Sprintf("%X", h.Sum(nil)[0:num]))
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}
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