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Implementation import/export JWK implementation
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@olegbespalov
olegbespalov committed Feb 23, 2024
1 parent 3ff1284 commit 8ff0bd5
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Showing 11 changed files with 271 additions and 64 deletions.
2 changes: 1 addition & 1 deletion examples/import_export/import-export-jwk-aes-key.js
View file
Expand Up @@ -25,7 +25,7 @@ import { crypto } from "k6/x/webcrypto";
"AES-CBC",
true, ["encrypt", "decrypt"]
);

console.log("imported: " + JSON.stringify(importedKey));

const exportedAgain = await crypto.subtle.exportKey("jwk", importedKey);
Expand Down
12 changes: 11 additions & 1 deletion go.mod
View file
Expand Up @@ -5,6 +5,7 @@ go 1.19
require (
github.com/dop251/goja v0.0.0-20231027120936-b396bb4c349d
github.com/google/uuid v1.3.1
github.com/lestrrat-go/jwx/v2 v2.0.20
github.com/stretchr/testify v1.8.4
go.k6.io/k6 v0.49.0
gopkg.in/guregu/null.v3 v3.3.0
Expand All @@ -13,22 +14,30 @@ require (
require (
github.com/cenkalti/backoff/v4 v4.2.1 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
github.com/dlclark/regexp2 v1.9.0 // indirect
github.com/fatih/color v1.16.0 // indirect
github.com/go-logr/logr v1.3.0 // indirect
github.com/go-logr/stdr v1.2.2 // indirect
github.com/go-sourcemap/sourcemap v2.1.4-0.20211119122758-180fcef48034+incompatible // indirect
github.com/goccy/go-json v0.10.2 // indirect
github.com/golang/protobuf v1.5.3 // indirect
github.com/google/pprof v0.0.0-20230728192033-2ba5b33183c6 // indirect
github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0 // indirect
github.com/josharian/intern v1.0.0 // indirect
github.com/lestrrat-go/blackmagic v1.0.2 // indirect
github.com/lestrrat-go/httpcc v1.0.1 // indirect
github.com/lestrrat-go/httprc v1.0.4 // indirect
github.com/lestrrat-go/iter v1.0.2 // indirect
github.com/lestrrat-go/option v1.0.1 // indirect
github.com/mailru/easyjson v0.7.7 // indirect
github.com/mattn/go-colorable v0.1.13 // indirect
github.com/mattn/go-isatty v0.0.20 // indirect
github.com/mstoykov/atlas v0.0.0-20220811071828-388f114305dd // indirect
github.com/onsi/ginkgo v1.16.5 // indirect
github.com/onsi/gomega v1.20.2 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/segmentio/asm v1.2.0 // indirect
github.com/serenize/snaker v0.0.0-20201027110005-a7ad2135616e // indirect
github.com/sirupsen/logrus v1.9.3 // indirect
github.com/spf13/afero v1.1.2 // indirect
Expand All @@ -40,8 +49,9 @@ require (
go.opentelemetry.io/otel/sdk v1.21.0 // indirect
go.opentelemetry.io/otel/trace v1.21.0 // indirect
go.opentelemetry.io/proto/otlp v1.0.0 // indirect
golang.org/x/crypto v0.19.0 // indirect
golang.org/x/net v0.19.0 // indirect
golang.org/x/sys v0.15.0 // indirect
golang.org/x/sys v0.17.0 // indirect
golang.org/x/text v0.14.0 // indirect
golang.org/x/time v0.5.0 // indirect
google.golang.org/genproto/googleapis/api v0.0.0-20231002182017-d307bd883b97 // indirect
Expand Down
27 changes: 24 additions & 3 deletions go.sum
View file
Expand Up @@ -8,6 +8,8 @@ github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ3
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 h1:8UrgZ3GkP4i/CLijOJx79Yu+etlyjdBU4sfcs2WYQMs=
github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0/go.mod h1:v57UDF4pDQJcEfFUCRop3lJL149eHGSe9Jvczhzjo/0=
github.com/dlclark/regexp2 v1.4.1-0.20201116162257-a2a8dda75c91/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
github.com/dlclark/regexp2 v1.7.0/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
github.com/dlclark/regexp2 v1.9.0 h1:pTK/l/3qYIKaRXuHnEnIf7Y5NxfRPfpb7dis6/gdlVI=
Expand All @@ -31,6 +33,8 @@ github.com/go-sourcemap/sourcemap v2.1.3+incompatible/go.mod h1:F8jJfvm2KbVjc5Nq
github.com/go-sourcemap/sourcemap v2.1.4-0.20211119122758-180fcef48034+incompatible h1:bopx7t9jyUNX1ebhr0G4gtQWmUOgwQRI0QsYhdYLgkU=
github.com/go-sourcemap/sourcemap v2.1.4-0.20211119122758-180fcef48034+incompatible/go.mod h1:F8jJfvm2KbVjc5NqelyYJmf/v5J0dwNLS2mL4sNA1Jg=
github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
github.com/golang/glog v1.1.2 h1:DVjP2PbBOzHyzA+dn3WhHIq4NdVu3Q+pvivFICf/7fo=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
Expand Down Expand Up @@ -68,6 +72,18 @@ github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/lestrrat-go/blackmagic v1.0.2 h1:Cg2gVSc9h7sz9NOByczrbUvLopQmXrfFx//N+AkAr5k=
github.com/lestrrat-go/blackmagic v1.0.2/go.mod h1:UrEqBzIR2U6CnzVyUtfM6oZNMt/7O7Vohk2J0OGSAtU=
github.com/lestrrat-go/httpcc v1.0.1 h1:ydWCStUeJLkpYyjLDHihupbn2tYmZ7m22BGkcvZZrIE=
github.com/lestrrat-go/httpcc v1.0.1/go.mod h1:qiltp3Mt56+55GPVCbTdM9MlqhvzyuL6W/NMDA8vA5E=
github.com/lestrrat-go/httprc v1.0.4 h1:bAZymwoZQb+Oq8MEbyipag7iSq6YIga8Wj6GOiJGdI8=
github.com/lestrrat-go/httprc v1.0.4/go.mod h1:mwwz3JMTPBjHUkkDv/IGJ39aALInZLrhBp0X7KGUZlo=
github.com/lestrrat-go/iter v1.0.2 h1:gMXo1q4c2pHmC3dn8LzRhJfP1ceCbgSiT9lUydIzltI=
github.com/lestrrat-go/iter v1.0.2/go.mod h1:Momfcq3AnRlRjI5b5O8/G5/BvpzrhoFTZcn06fEOPt4=
github.com/lestrrat-go/jwx/v2 v2.0.20 h1:sAgXuWS/t8ykxS9Bi2Qtn5Qhpakw1wrcjxChudjolCc=
github.com/lestrrat-go/jwx/v2 v2.0.20/go.mod h1:UlCSmKqw+agm5BsOBfEAbTvKsEApaGNqHAEUTv5PJC4=
github.com/lestrrat-go/option v1.0.1 h1:oAzP2fvZGQKWkvHa1/SAcFolBEca1oN+mQ7eooNBEYU=
github.com/lestrrat-go/option v1.0.1/go.mod h1:5ZHFbivi4xwXxhxY9XHDe2FHo6/Z7WWmtT7T5nBBp3I=
github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
Expand All @@ -94,6 +110,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
github.com/segmentio/asm v1.2.0 h1:9BQrFxC+YOHJlTlHGkTrFWf59nbL3XnCoFLTwDCI7ys=
github.com/segmentio/asm v1.2.0/go.mod h1:BqMnlJP91P8d+4ibuonYZw9mfnzI9HfxselHZr5aAcs=
github.com/serenize/snaker v0.0.0-20201027110005-a7ad2135616e h1:zWKUYT07mGmVBH+9UgnHXd/ekCK99C8EbDSAt5qsjXE=
github.com/serenize/snaker v0.0.0-20201027110005-a7ad2135616e/go.mod h1:Yow6lPLSAXx2ifx470yD/nUe22Dv5vBvxK/UK9UUTVs=
github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
Expand All @@ -102,7 +120,9 @@ github.com/spf13/afero v1.1.2 h1:m8/z1t7/fwjysjQRYbP0RD+bUIF/8tJwPdEZsI83ACI=
github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
Expand Down Expand Up @@ -130,7 +150,8 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
golang.org/x/crypto v0.17.0 h1:r8bRNjWL3GshPW3gkd+RpvzWrZAwPS49OmTGZ/uhM4k=
golang.org/x/crypto v0.19.0 h1:ENy+Az/9Y1vSrlrvBSyna3PITt4tiZLf7sgCjZBX7Wo=
golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
Expand Down Expand Up @@ -163,8 +184,8 @@ golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBc
golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
Expand Down
64 changes: 45 additions & 19 deletions webcrypto/aes.go
View file
Expand Up @@ -6,6 +6,7 @@ import (
"crypto/cipher"
"crypto/rand"
"errors"
"fmt"

"github.com/dop251/goja"
)
Expand All @@ -23,6 +24,12 @@ type AESKeyGenParams struct {
Length bitLength `js:"length"`
}

var _ hasAlg = (*AESKeyGenParams)(nil)

func (akgp AESKeyGenParams) alg() string {
return akgp.Name
}

// newAESKeyGenParams creates a new AESKeyGenParams object, from the
// normalized algorithm, and the algorithm parameters.
//
Expand Down Expand Up @@ -84,7 +91,7 @@ func (akgp *AESKeyGenParams) GenerateKey(
// 5. 6. 7. 8. 9.
key := CryptoKey{}
key.Type = SecretCryptoKeyType
key.Algorithm = AESKeyAlgorithm{
key.Algorithm = &AESKeyAlgorithm{
Algorithm: akgp.Algorithm,
Length: int64(akgp.Length),
}
Expand Down Expand Up @@ -114,10 +121,14 @@ type AESKeyAlgorithm struct {
Length int64 `js:"length"`
}

var _ hasAlg = (*AESKeyAlgorithm)(nil)

func (aka AESKeyAlgorithm) alg() string {
return aka.Name
}

// exportAESKey exports an AES key to its raw representation.
//
// TODO @oleiade: support JWK format.
func exportAESKey(key *CryptoKey, format KeyFormat) ([]byte, error) {
func exportAESKey(key *CryptoKey, format KeyFormat) (interface{}, error) {
if !key.Extractable {
return nil, NewError(InvalidAccessError, "the key is not extractable")
}
Expand All @@ -135,8 +146,15 @@ func exportAESKey(key *CryptoKey, format KeyFormat) ([]byte, error) {
}

return handle, nil
case JwkKeyFormat:
m, err := exportSymmetricJWK(key)
if err != nil {
return nil, NewError(ImplementationError, err.Error())
}

return m, nil

default:
// FIXME: note that we do not support JWK format, yet.
return nil, NewError(NotSupportedError, unsupportedKeyFormatErrorMsg+" "+format)
}
}
Expand All @@ -156,8 +174,6 @@ func newAESImportParams(normalized Algorithm) *AESImportParams {

// ImportKey imports an AES key from its raw representation.
// It implements the KeyImporter interface.
//
// TODO @oleiade: support JWK format #37
func (aip *AESImportParams) ImportKey(
format KeyFormat,
keyData []byte,
Expand All @@ -172,21 +188,31 @@ func (aip *AESImportParams) ImportKey(
}
}

switch format {
case RawKeyFormat:
var (
has128Bits = len(keyData) == 16
has192Bits = len(keyData) == 24
has256Bits = len(keyData) == 32
)

if !has128Bits && !has192Bits && !has256Bits {
return nil, NewError(DataError, "invalid key length")
}
default:
// only raw and jwk formats are supported for HMAC
if format != RawKeyFormat && format != JwkKeyFormat {
return nil, NewError(NotSupportedError, unsupportedKeyFormatErrorMsg+" "+format)
}

// if the key is in JWK format, we need to extract the symmetric key from it
if format == JwkKeyFormat {
var err error
keyData, err = extractSymmetricJWK(keyData)
if err != nil {
return nil, NewError(DataError, err.Error())
}
}

// check the key length
var (
has128Bits = len(keyData) == 16
has192Bits = len(keyData) == 24
has256Bits = len(keyData) == 32
)

if !has128Bits && !has192Bits && !has256Bits {
return nil, NewError(DataError, fmt.Sprintf("invalid key length %v bytes", len(keyData)))
}

key := &CryptoKey{
Algorithm: AESKeyAlgorithm{
Algorithm: aip.Algorithm,
Expand Down
6 changes: 6 additions & 0 deletions webcrypto/algorithm.go
View file
Expand Up @@ -187,3 +187,9 @@ func isAesAlgorithm(algorithmName string) bool {
func isHashAlgorithm(algorithmName string) bool {
return algorithmName == SHA1 || algorithmName == SHA256 || algorithmName == SHA384 || algorithmName == SHA512
}

// hasAlg an internal interface that helps us to identify
// if a given object has an algorithm method.
type hasAlg interface {
alg() string
}
6 changes: 6 additions & 0 deletions webcrypto/hash.go
View file
Expand Up @@ -23,3 +23,9 @@ func getHashFn(name string) (func() hash.Hash, bool) {
return nil, false
}
}

// hasHash an internal interface that helps us to identify
// if a given object has a hash method.
type hasHash interface {
hash() string
}
42 changes: 34 additions & 8 deletions webcrypto/hmac.go
View file
Expand Up @@ -30,6 +30,10 @@ type HMACKeyGenParams struct {
Length null.Int `js:"length"`
}

func (hkgp HMACKeyGenParams) hash() string {
return hkgp.Hash.Name
}

// newHMACKeyGenParams creates a new HMACKeyGenParams object, from the normalized
// algorithm, and the params parameters passed by the user.
//
Expand Down Expand Up @@ -132,7 +136,7 @@ func (hkgp *HMACKeyGenParams) GenerateKey(
key := &CryptoKey{Type: SecretCryptoKeyType, handle: randomKey}

// 6.
algorithm := HMACKeyAlgorithm{}
algorithm := &HMACKeyAlgorithm{}

// 7.
algorithm.Name = HMAC
Expand Down Expand Up @@ -169,7 +173,11 @@ type HMACKeyAlgorithm struct {
Length int64 `js:"length"`
}

func exportHMACKey(ck *CryptoKey, format KeyFormat) ([]byte, error) {
func (hka HMACKeyAlgorithm) hash() string {
return hka.Hash.Name
}

func exportHMACKey(ck *CryptoKey, format KeyFormat) (interface{}, error) {
// 1.
if ck.handle == nil {
return nil, NewError(OperationError, "key data is not accessible")
Expand All @@ -185,6 +193,13 @@ func exportHMACKey(ck *CryptoKey, format KeyFormat) ([]byte, error) {
switch format {
case RawKeyFormat:
return bits, nil
case JwkKeyFormat:
m, err := exportSymmetricJWK(ck)
if err != nil {
return nil, NewError(ImplementationError, err.Error())
}

return m, nil
default:
// FIXME: note that we do not support JWK format, yet #37.
return nil, NewError(NotSupportedError, "unsupported key format "+format)
Expand Down Expand Up @@ -219,6 +234,12 @@ type HMACImportParams struct {
Length null.Int `js:"length"`
}

var _ hasHash = (*HMACImportParams)(nil)

func (hip HMACImportParams) hash() string {
return hip.Hash.Name
}

// newHMACImportParams creates a new HMACImportParams object from the given
// algorithm and params objects.
func newHMACImportParams(rt *goja.Runtime, normalized Algorithm, params goja.Value) (*HMACImportParams, error) {
Expand Down Expand Up @@ -277,14 +298,19 @@ func (hip *HMACImportParams) ImportKey(
}

// 3.
var hash KeyAlgorithm
if format != RawKeyFormat && format != JwkKeyFormat {
return nil, NewError(NotSupportedError, "unsupported key format "+format)
}

hash := KeyAlgorithm{Algorithm{Name: hip.Hash.Name}}

// 4.
switch format {
case RawKeyFormat:
hash = KeyAlgorithm{Algorithm{Name: hip.Hash.Name}}
default:
return nil, NewError(NotSupportedError, "unsupported key format "+format)
if format == JwkKeyFormat {
var err error
keyData, err = extractSymmetricJWK(keyData)
if err != nil {
return nil, NewError(DataError, err.Error())
}
}

// 5. 6.
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