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// Copyright (C) 2023-2024 Holger de Carne and contributors | ||
// | ||
// This software may be modified and distributed under the terms | ||
// of the MIT license. See the LICENSE file for details. | ||
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package certs | ||
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import ( | ||
"crypto/x509" | ||
"encoding/asn1" | ||
"encoding/hex" | ||
"fmt" | ||
"slices" | ||
"strconv" | ||
"strings" | ||
) | ||
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const KeyUsageExtensionName = "KeyUsage" | ||
const KeyUsageExtensionOID = "2.5.29.15" | ||
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var keyUsages = []x509.KeyUsage{ | ||
x509.KeyUsageDigitalSignature, | ||
x509.KeyUsageContentCommitment, | ||
x509.KeyUsageKeyEncipherment, | ||
x509.KeyUsageDataEncipherment, | ||
x509.KeyUsageKeyAgreement, | ||
x509.KeyUsageCertSign, | ||
x509.KeyUsageCRLSign, | ||
x509.KeyUsageEncipherOnly, | ||
x509.KeyUsageDecipherOnly, | ||
} | ||
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var keyUsageStrings = map[x509.KeyUsage]string{ | ||
x509.KeyUsageDigitalSignature: "digitalSignature", | ||
x509.KeyUsageContentCommitment: "contentCommitment", | ||
x509.KeyUsageKeyEncipherment: "keyEncipherment", | ||
x509.KeyUsageDataEncipherment: "dataEncipherment", | ||
x509.KeyUsageKeyAgreement: "keyAgreement", | ||
x509.KeyUsageCertSign: "keyCertSign", | ||
x509.KeyUsageCRLSign: "cRLSign", | ||
x509.KeyUsageEncipherOnly: "encipherOnly", | ||
x509.KeyUsageDecipherOnly: "decipherOnly", | ||
} | ||
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func KeyUsageString(keyUsage x509.KeyUsage) string { | ||
if keyUsage == 0 { | ||
return "-" | ||
} | ||
var keyUsageFlags x509.KeyUsage | ||
var builder strings.Builder | ||
for _, keyUsageFlag := range keyUsages { | ||
keyUsageFlags |= keyUsageFlag | ||
if (keyUsage & keyUsageFlag) == keyUsageFlag { | ||
if builder.Len() > 0 { | ||
builder.WriteString(", ") | ||
} | ||
builder.WriteString(keyUsageStrings[keyUsageFlag]) | ||
} | ||
} | ||
unknownKeyUsage := keyUsage ^ keyUsageFlags | ||
if unknownKeyUsage != 0 { | ||
if builder.Len() > 0 { | ||
builder.WriteString(", ") | ||
} | ||
builder.WriteString("0x" + strconv.FormatUint(uint64(unknownKeyUsage), 16)) | ||
} | ||
return builder.String() | ||
} | ||
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const ExtKeyUsageExtensionName = "ExtKeyUsage" | ||
const ExtKeyUsageExtensionOID = "2.5.29.37" | ||
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var extKeyUsages = []x509.ExtKeyUsage{ | ||
x509.ExtKeyUsageAny, | ||
x509.ExtKeyUsageServerAuth, | ||
x509.ExtKeyUsageClientAuth, | ||
x509.ExtKeyUsageCodeSigning, | ||
x509.ExtKeyUsageEmailProtection, | ||
x509.ExtKeyUsageIPSECEndSystem, | ||
x509.ExtKeyUsageIPSECTunnel, | ||
x509.ExtKeyUsageIPSECUser, | ||
x509.ExtKeyUsageTimeStamping, | ||
x509.ExtKeyUsageOCSPSigning, | ||
x509.ExtKeyUsageMicrosoftServerGatedCrypto, | ||
x509.ExtKeyUsageNetscapeServerGatedCrypto, | ||
x509.ExtKeyUsageMicrosoftCommercialCodeSigning, | ||
x509.ExtKeyUsageMicrosoftKernelCodeSigning, | ||
} | ||
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var extKeyUsageStrings = map[x509.ExtKeyUsage]string{ | ||
x509.ExtKeyUsageAny: "any", | ||
x509.ExtKeyUsageServerAuth: "serverAuth", | ||
x509.ExtKeyUsageClientAuth: "clientAuth", | ||
x509.ExtKeyUsageCodeSigning: "codeSigning", | ||
x509.ExtKeyUsageEmailProtection: "emailProtection", | ||
x509.ExtKeyUsageIPSECEndSystem: "ipsecEndSystem", | ||
x509.ExtKeyUsageIPSECTunnel: "ipsecTunnel", | ||
x509.ExtKeyUsageIPSECUser: "ipsecUser", | ||
x509.ExtKeyUsageTimeStamping: "timeStamping", | ||
x509.ExtKeyUsageOCSPSigning: "ocspSigning", | ||
x509.ExtKeyUsageMicrosoftServerGatedCrypto: "microsoftServerGatedCrypto", | ||
x509.ExtKeyUsageNetscapeServerGatedCrypto: "netscapeServerGatedCrypto", | ||
x509.ExtKeyUsageMicrosoftCommercialCodeSigning: "microsoftCommercialCodeSigning", | ||
x509.ExtKeyUsageMicrosoftKernelCodeSigning: "microsoftKernelCodeSigning", | ||
} | ||
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func ExtKeyUsageString(extKeyUsage []x509.ExtKeyUsage, unknownExtKeyUsage []asn1.ObjectIdentifier) string { | ||
if len(extKeyUsage) == 0 && len(unknownExtKeyUsage) == 0 { | ||
return "-" | ||
} | ||
var builder strings.Builder | ||
for _, extKeyUsageId := range extKeyUsages { | ||
index := slices.Index(extKeyUsage, extKeyUsageId) | ||
if index < 0 { | ||
continue | ||
} | ||
if builder.Len() > 0 { | ||
builder.WriteString(", ") | ||
} | ||
builder.WriteString(extKeyUsageStrings[extKeyUsageId]) | ||
} | ||
for _, unknownExtKeyUsageId := range unknownExtKeyUsage { | ||
if builder.Len() > 0 { | ||
builder.WriteString(", ") | ||
} | ||
builder.WriteString(unknownExtKeyUsageId.String()) | ||
} | ||
return builder.String() | ||
} | ||
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const BasicConstraintsExtensionName = "BasicConstraints" | ||
const BasicConstraintsExtensionOID = "2.5.29.19" | ||
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func BasicConstraintsString(isCA bool, maxPathLen int, maxPathLenZero bool) string { | ||
if !isCA { | ||
return "CA = false" | ||
} | ||
if maxPathLen < 0 || (maxPathLen == 0 && !maxPathLenZero) { | ||
return "CA = true" | ||
} | ||
return fmt.Sprintf("CA = true, pathLenConstraint = %d", maxPathLen) | ||
} | ||
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const SubjectKeyIdentifierExtensionName = "SubjectKeyIdentifier" | ||
const SubjectKeyIdentifierExtensionOID = "2.5.29.14" | ||
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const AuthorityKeyIdentifierExtensionName = "AuthorityKeyIdentifier" | ||
const AuthorityKeyIdentifierExtensionOID = "2.5.29.35" | ||
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const stringLimit = 32 | ||
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func KeyIdentifierString(keyId []byte) string { | ||
if len(keyId) == 0 { | ||
return "" | ||
} | ||
var builder strings.Builder | ||
encoder := hex.NewEncoder(&builder) | ||
for i := range keyId { | ||
if i >= stringLimit { | ||
builder.WriteString(":...") | ||
break | ||
} | ||
if builder.Len() > 0 { | ||
builder.WriteString(":") | ||
} | ||
encoder.Write(keyId[i : i+1]) | ||
} | ||
return builder.String() | ||
} |
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// Copyright (C) 2023-2024 Holger de Carne and contributors | ||
// | ||
// This software may be modified and distributed under the terms | ||
// of the MIT license. See the LICENSE file for details. | ||
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package certs_test | ||
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import ( | ||
"crypto/x509" | ||
"encoding/asn1" | ||
"testing" | ||
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"github.com/hdecarne-github/go-certstore/certs" | ||
"github.com/stretchr/testify/require" | ||
) | ||
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func TestKeyUsageString(t *testing.T) { | ||
require.Equal(t, "-", certs.KeyUsageString(0)) | ||
require.Equal(t, "digitalSignature, contentCommitment, keyEncipherment, dataEncipherment, keyAgreement, keyCertSign, cRLSign, encipherOnly, decipherOnly, 0xfe00", certs.KeyUsageString(0xffff)) | ||
} | ||
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func TestExtKeyUsageString(t *testing.T) { | ||
require.Equal(t, "-", certs.ExtKeyUsageString([]x509.ExtKeyUsage{}, []asn1.ObjectIdentifier{})) | ||
require.Equal(t, "any, 1.2.3.4", certs.ExtKeyUsageString([]x509.ExtKeyUsage{x509.ExtKeyUsageAny}, []asn1.ObjectIdentifier{asn1.ObjectIdentifier([]int{1, 2, 3, 4})})) | ||
} | ||
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const basicConstraintsNoCA = "CA = false" | ||
const basicConstratinsCAWithoutPathLenConstraint = "CA = true" | ||
const basicConstratinsCAWithPathLenConstraint = "CA = true, pathLenConstraint = 2" | ||
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func TestBasicConstraintsString(t *testing.T) { | ||
require.Equal(t, basicConstraintsNoCA, certs.BasicConstraintsString(false, 0, false)) | ||
require.Equal(t, basicConstratinsCAWithoutPathLenConstraint, certs.BasicConstraintsString(true, -1, true)) | ||
require.Equal(t, basicConstratinsCAWithoutPathLenConstraint, certs.BasicConstraintsString(true, -1, false)) | ||
require.Equal(t, basicConstratinsCAWithoutPathLenConstraint, certs.BasicConstraintsString(true, 0, false)) | ||
require.Equal(t, basicConstratinsCAWithPathLenConstraint, certs.BasicConstraintsString(true, 2, false)) | ||
require.Equal(t, basicConstratinsCAWithPathLenConstraint, certs.BasicConstraintsString(true, 2, true)) | ||
} | ||
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func TestKeyIdentiferString(t *testing.T) { | ||
keyId1 := []byte{0x88, 0x1b, 0xd6, 0x08, 0x08, 0xe2, 0xef, 0x84, 0x74, 0xc7, 0x1c, 0x2c, 0x87, 0xd1, 0xd6, 0x87, 0x6b, 0x7b, 0x94, 0x59} | ||
require.Equal(t, "88:1b:d6:08:08:e2:ef:84:74:c7:1c:2c:87:d1:d6:87:6b:7b:94:59", certs.KeyIdentifierString(keyId1)) | ||
keyId2 := []byte{0x88, 0x1b, 0xd6, 0x08, 0x08, 0xe2, 0xef, 0x84, 0x74, 0xc7, 0x1c, 0x2c, 0x87, 0xd1, 0xd6, 0x87, 0x6b, 0x7b, 0x94, 0x59, 0x88, 0x1b, 0xd6, 0x08, 0x08, 0xe2, 0xef, 0x84, 0x74, 0xc7, 0x1c, 0x2c, 0x87, 0xd1, 0xd6, 0x87, 0x6b, 0x7b, 0x94, 0x59} | ||
require.Equal(t, "88:1b:d6:08:08:e2:ef:84:74:c7:1c:2c:87:d1:d6:87:6b:7b:94:59:88:1b:d6:08:08:e2:ef:84:74:c7:1c:2c:...", certs.KeyIdentifierString(keyId2)) | ||
} |