sparrow/vendor/github.com/gogf/gf/v2/encoding/ghash/ghash_bkdr.go

// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.

package ghash

// BKDR implements the classic BKDR hash algorithm for 32 bits.
func BKDR(str []byte) uint32 {
	var (
		seed uint32 = 131 // 31 131 1313 13131 131313 etc..
		hash uint32 = 0
	)
	for i := 0; i < len(str); i++ {
		hash = hash*seed + uint32(str[i])
	}
	return hash
}

// BKDR64 implements the classic BKDR hash algorithm for 64 bits.
func BKDR64(str []byte) uint64 {
	var (
		seed uint64 = 131 // 31 131 1313 13131 131313 etc..
		hash uint64 = 0
	)
	for i := 0; i < len(str); i++ {
		hash = hash*seed + uint64(str[i])
	}
	return hash
}