-
Notifications
You must be signed in to change notification settings - Fork 11
/
hasher.go
82 lines (65 loc) · 2.19 KB
/
hasher.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
// Copyright (c) 2016 Pani Networks
// All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package hasher
import (
"crypto/sha1"
"encoding/hex"
"fmt"
"github.com/romana/core/common"
"strings"
)
// HashRomanaPolicies generates unique hash for a list of romana policies.
func HashRomanaPolicies(policies []common.Policy) string {
var hashes []string
for _, policy := range policies {
hashes = append(hashes, HashRomanaPolicy(policy))
}
return HashListOfStrings(hashes)
}
// HashRomanaPolicies generates sha1 hash from a canonical form of the policy.
func HashRomanaPolicy(policy common.Policy) string {
sorted := PolicyToCanonical(policy)
var data string
data = fmt.Sprintf("%s.%s.%s.%d.%s", policy.Direction, policy.Description, policy.Name, policy.ID, policy.ExternalID)
for _, e := range sorted.AppliedTo {
data = fmt.Sprintf("%s.%s", data, EndpointToString(e))
}
for _, i := range sorted.Ingress {
for _, e := range i.Peers {
data = fmt.Sprintf("%s.%s", data, EndpointToString(e))
}
for _, r := range i.Rules {
data = fmt.Sprintf("%s.%s%d%d%t", data, r.Protocol, r.IcmpType, r.IcmpCode, r.IsStateful)
for _, p := range r.Ports {
data = fmt.Sprintf("%s%d", data, p)
}
for _, p := range r.PortRanges {
data = fmt.Sprintf("%s%d%d", data, p[0], p[1])
}
}
}
hasher := sha1.New()
hasher.Write([]byte(data))
sum := hasher.Sum(nil)
return fmt.Sprint(hex.EncodeToString(sum))
}
// HashListOfStrings generates sha1 hash from a list of strings.
func HashListOfStrings(hashes []string) string {
data := strings.Join(hashes, "")
hasher := sha1.New()
hasher.Write([]byte(data))
sum := hasher.Sum(nil)
return fmt.Sprint(hex.EncodeToString(sum))
}