crypto: remove unused code (#8412)

crypto/random.go

@@ -1,35 +1,15 @@
 package crypto
 
 import (
-	crand "crypto/rand"
-	"encoding/hex"
-	"io"
+	"crypto/rand"
 )
 
 // This only uses the OS's randomness
-func randBytes(numBytes int) []byte {
+func CRandBytes(numBytes int) []byte {
 	b := make([]byte, numBytes)
-	_, err := crand.Read(b)
+	_, err := rand.Read(b)
 	if err != nil {
 		panic(err)
 	}
 	return b
 }
-
-// This only uses the OS's randomness
-func CRandBytes(numBytes int) []byte {
-	return randBytes(numBytes)
-}
-
-// CRandHex returns a hex encoded string that's floor(numDigits/2) * 2 long.
-//
-// Note: CRandHex(24) gives 96 bits of randomness that
-// are usually strong enough for most purposes.
-func CRandHex(numDigits int) string {
-	return hex.EncodeToString(CRandBytes(numDigits / 2))
-}
-
-// Returns a crand.Reader.
-func CReader() io.Reader {
-	return crand.Reader
-}