CodeSampleX

示例

go.step.sm/crypto v0.44.6: x509util.NewCertificate

已验证示例 — golang go.step.sm/crypto v0.44.6: x509util.NewCertificate. contract 在 go 1.26 · linux alpine/x64 · docker 上运行并通过： x509util.NewCertificate creates a…

sha256:5648905e268af9274f3ee222ecbc4f80f0b19fc63457fcbec0dfe0c2b5dfe5f2

本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。 提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。 MIT-0

执行证据

声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。

证据依据
签名契约通过
验证回执
1
构建过它的签名密钥
1
声明的环境 go linux 24 · ubuntu · glibc 2.39 x64 go go go

验证运行环境

环境 契约 阶段 运行日期
go 1.26 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · golang@1golang:1.26-alpine@sha256:28d89ee9cc0f…		 2026-08-27

案例

HOW
目标
verify go.step.sm/crypto/x509util.NewCertificate in pkg:golang/go.step.sm/crypto@v0.44.6
包
符号
  • go.step.sm/crypto/x509util.NewCertificate
环境
go
创建时间
2026-08-27T14:04:13Z

契约

  1. x509util.NewCertificate creates a *Certificate from a valid *x509.CertificateRequest with default leaf key usages and SANs.
  2. x509util.NewCertificate applies template options such as x509util.WithTemplate to customize certificate fields.
  3. x509util.NewCertificate returns an error when the CertificateRequest signature is invalid or when template execution fails.

文件

  • PROMPT.md
  • csx.json
  • go.mod
  • go.sum
  • newcert_test.go
  • spec.json

下载源代码构件 (tar.gz)

源代码

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify go.step.sm/crypto/x509util.NewCertificate in pkg:golang/go.step.sm/crypto@v0.44.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.step.sm/crypto@v0.44.6
Demonstrate these symbols/APIs:
  - go.step.sm/crypto/x509util.NewCertificate
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:4a318a033f20cc801011703d0b6d1c88af15a730830df34c559b9c8dfdb2bf79","contract":["x509util.NewCertificate creates a *Certificate from a valid *x509.CertificateRequest with default leaf key usages and SANs.","x509util.NewCertificate applies template options such as x509util.WithTemplate to customize certificate fields.","x509util.NewCertificate returns an error when the CertificateRequest signature is invalid or when template execution fails."],"goal":"verify go.step.sm/crypto/x509util.NewCertificate in pkg:golang/go.step.sm/crypto@v0.44.6","kind":"HOW","packages":["pkg:golang/go.step.sm/crypto@v0.44.6"],"schemaVersion":1,"symbols":["go.step.sm/crypto/x509util.NewCertificate"]},"contractCommand":["go","test","./..."],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","executionContext":"go","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","runtime":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/go.step.sm/crypto@v0.44.6"],"schemaVersion":1,"subject":"pkg:golang/go.step.sm/crypto@v0.44.6","symbols":["go.step.sm/crypto/x509util.NewCertificate"],"verifierAdapter":"golang@1"}
go.mod
module example.com/newcert

go 1.25.8

require go.step.sm/crypto v0.89.0

require (
	dario.cat/mergo v1.0.1 // indirect
	filippo.io/edwards25519 v1.2.0 // indirect
	github.com/Masterminds/goutils v1.1.1 // indirect
	github.com/Masterminds/semver/v3 v3.3.0 // indirect
	github.com/Masterminds/sprig/v3 v3.3.0 // indirect
	github.com/go-jose/go-jose/v3 v3.0.5 // indirect
	github.com/google/uuid v1.6.0 // indirect
	github.com/huandu/xstrings v1.5.0 // indirect
	github.com/mitchellh/copystructure v1.2.0 // indirect
	github.com/mitchellh/reflectwalk v1.0.2 // indirect
	github.com/pkg/errors v0.9.1 // indirect
	github.com/shopspring/decimal v1.4.0 // indirect
	github.com/spf13/cast v1.7.0 // indirect
	golang.org/x/crypto v0.54.0 // indirect
	golang.org/x/net v0.57.0 // indirect
	golang.org/x/sys v0.47.0 // indirect
	golang.org/x/text v0.40.0 // indirect
)
go.sum
dario.cat/mergo v1.0.1 h1:Ra4+bf83h2ztPIQYNP99R6m+Y7KfnARDfID+a+vLl4s=
dario.cat/mergo v1.0.1/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
filippo.io/edwards25519 v1.2.0 h1:crnVqOiS4jqYleHd9vaKZ+HKtHfllngJIiOpNpoJsjo=
filippo.io/edwards25519 v1.2.0/go.mod h1:xzAOLCNug/yB62zG1bQ8uziwrIqIuxhctzJT18Q77mc=
github.com/Masterminds/goutils v1.1.1 h1:5nUrii3FMTL5diU80unEVvNevw1nH4+ZV4DSLVJLSYI=
github.com/Masterminds/goutils v1.1.1/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
github.com/Masterminds/semver/v3 v3.3.0 h1:B8LGeaivUe71a5qox1ICM/JLl0NqZSW5CHyL+hmvYS0=
github.com/Masterminds/semver/v3 v3.3.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
github.com/Masterminds/sprig/v3 v3.3.0 h1:mQh0Yrg1XPo6vjYXgtf5OtijNAKJRNcTdOOGZe3tPhs=
github.com/Masterminds/sprig/v3 v3.3.0/go.mod h1:Zy1iXRYNqNLUolqCpL4uhk6SHUMAOSCzdgBfDb35Lz0=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
github.com/go-jose/go-jose/v3 v3.0.5 h1:BLLJWbC4nMZOfuPVxoZIxeYsn6Nl2r1fITaJ78UQlVQ=
github.com/go-jose/go-jose/v3 v3.0.5/go.mod h1:5b+7YgP7ZICgJDBdfjZaIt+H/9L9T/YQrVfLAMboGkQ=
github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/huandu/xstrings v1.5.0 h1:2ag3IFq9ZDANvthTwTiqSSZLjDc+BedvHPAp5tJy2TI=
github.com/huandu/xstrings v1.5.0/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/mitchellh/copystructure v1.2.0 h1:vpKXTN4ewci03Vljg/q9QvCGUDttBOGBIa15WveJJGw=
github.com/mitchellh/copystructure v1.2.0/go.mod h1:qLl+cE2AmVv+CoeAwDPye/v+N2HKCj9FbZEVFJRxO9s=
github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zxSIeXaQ=
github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
github.com/shopspring/decimal v1.4.0 h1:bxl37RwXBklmTi0C79JfXCEBD1cqqHt0bbgBAGFp81k=
github.com/shopspring/decimal v1.4.0/go.mod h1:gawqmDU56v4yIKSwfBSFip1HdCCXN8/+DMd9qYNcwME=
github.com/spf13/cast v1.7.0 h1:ntdiHjuueXFgm5nzDRdOS4yfT43P5Fnud6DH50rz/7w=
github.com/spf13/cast v1.7.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
go.step.sm/crypto v0.89.0 h1:NPxryE+cZ4XDwXOQY2U6Gu+mOzOihuRLPIsX7WtPzZM=
go.step.sm/crypto v0.89.0/go.mod h1:IEgE6DndnYojbDyHU7eYXpwWzpu4ftkouw7nyI6jsxg=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
golang.org/x/crypto v0.54.0 h1:YLIA59K4fiNzHzjnZt2tUJQjQtUWfWbeHBqKtk3eScw=
golang.org/x/crypto v0.54.0/go.mod h1:KWL8ny2AZdGR2cWmzeHrp2azQPGogOv+HeQaVEXC2dk=
golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
golang.org/x/net v0.57.0 h1:K5+3DljvIuDG9/Jv9rvyMywYNFCQ9RSUY6OOTTkT+tE=
golang.org/x/net v0.57.0/go.mod h1:KpXc8iv+r3XplLAG/f7Jsf9RPszJzdR0f58q9vGOuEU=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
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/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk=
golang.org/x/term v0.45.0 h1:NwWyBmoJCbfTHpxrWoZ9C6/VxOf7ic219I8xZZFdrf0=
golang.org/x/term v0.45.0/go.mod h1:9aqxs0blBcrm/n0L9QW0aRVD+ktan8ssZromtqJC43w=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
golang.org/x/text v0.40.0 h1:Ub2Z6/xjgF1WrYQz2nuITOEegKFtiIy+rieRJ5lHZKs=
golang.org/x/text v0.40.0/go.mod h1:hpnzDAfGV753zIKo+wk3u1bVKCGPbrnF7+7LBF/UHVY=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
newcert_test.go
package newcert_test

import (
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rand"
	"crypto/x509"
	"crypto/x509/pkix"
	"net"
	"testing"

	"go.step.sm/crypto/x509util"
)

func generateCSR(t *testing.T, commonName string, dnsNames []string, ips []net.IP, emails []string) (*x509.CertificateRequest, *ecdsa.PrivateKey) {
	t.Helper()
	priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
	if err != nil {
		t.Fatalf("failed to generate private key: %v", err)
	}

	csrTemplate := &x509.CertificateRequest{
		Subject: pkix.Name{
			CommonName:   commonName,
			Organization: []string{"Example Org"},
		},
		DNSNames:       dnsNames,
		IPAddresses:    ips,
		EmailAddresses: emails,
	}

	csrBytes, err := x509.CreateCertificateRequest(rand.Reader, csrTemplate, priv)
	if err != nil {
		t.Fatalf("failed to create CSR: %v", err)
	}

	csr, err := x509.ParseCertificateRequest(csrBytes)
	if err != nil {
		t.Fatalf("failed to parse CSR: %v", err)
	}

	return csr, priv
}

func TestNewCertificate_SimpleCSR(t *testing.T) {
	csr, priv := generateCSR(t, "app.example.com", []string{"app.example.com", "localhost"}, []net.IP{net.ParseIP("127.0.0.1")}, []string{"admin@example.com"})

	cert, err := x509util.NewCertificate(csr)
	if err != nil {
		t.Fatalf("NewCertificate failed: %v", err)
	}
	if cert == nil {
		t.Fatal("expected non-nil Certificate")
	}

	if cert.Subject.CommonName != "app.example.com" {
		t.Errorf("expected CommonName 'app.example.com', got %q", cert.Subject.CommonName)
	}
	if len(cert.DNSNames) != 2 || cert.DNSNames[0] != "app.example.com" || cert.DNSNames[1] != "localhost" {
		t.Errorf("unexpected DNSNames: %v", cert.DNSNames)
	}
	if len(cert.IPAddresses) != 1 || !cert.IPAddresses[0].Equal(net.ParseIP("127.0.0.1")) {
		t.Errorf("unexpected IPAddresses: %v", cert.IPAddresses)
	}
	if len(cert.EmailAddresses) != 1 || cert.EmailAddresses[0] != "admin@example.com" {
		t.Errorf("unexpected EmailAddresses: %v", cert.EmailAddresses)
	}

	// Default leaf key usages
	if cert.KeyUsage != x509util.KeyUsage(x509.KeyUsageDigitalSignature) {
		t.Errorf("unexpected KeyUsage: %v", cert.KeyUsage)
	}
	expectedExtKeyUsage := x509util.ExtKeyUsage([]x509.ExtKeyUsage{
		x509.ExtKeyUsageServerAuth,
		x509.ExtKeyUsageClientAuth,
	})
	if len(cert.ExtKeyUsage) != len(expectedExtKeyUsage) {
		t.Errorf("unexpected ExtKeyUsage length: %v", cert.ExtKeyUsage)
	}

	// Public key verification
	if !priv.PublicKey.Equal(cert.PublicKey) {
		t.Error("expected public key to match private key")
	}

	// Convert to standard x509.Certificate
	x509Cert := cert.GetCertificate()
	if x509Cert == nil {
		t.Fatal("expected non-nil x509.Certificate from GetCertificate()")
	}
	if x509Cert.Subject.CommonName != "app.example.com" {
		t.Errorf("expected x509Cert CommonName 'app.example.com', got %q", x509Cert.Subject.CommonName)
	}
}

func TestNewCertificate_WithTemplate(t *testing.T) {
	csr, _ := generateCSR(t, "service.example.com", []string{"service.example.com"}, nil, nil)

	templateJSON := `{
		"subject": {"commonName": "custom.example.com"},
		"sans": [{"type": "dns", "value": "custom.example.com"}, {"type": "dns", "value": "alt.example.com"}],
		"keyUsage": ["digitalSignature", "keyEncipherment"],
		"extKeyUsage": ["serverAuth"]
	}`

	data := x509util.CreateTemplateData("custom.example.com", []string{"custom.example.com", "alt.example.com"})
	opt := x509util.WithTemplate(templateJSON, data)

	cert, err := x509util.NewCertificate(csr, opt)
	if err != nil {
		t.Fatalf("NewCertificate with template failed: %v", err)
	}

	if cert.Subject.CommonName != "custom.example.com" {
		t.Errorf("expected Subject CommonName 'custom.example.com', got %q", cert.Subject.CommonName)
	}
	if len(cert.SANs) != 2 {
		t.Fatalf("expected 2 SANs, got %d", len(cert.SANs))
	}
	if cert.KeyUsage != x509util.KeyUsage(x509.KeyUsageDigitalSignature|x509.KeyUsageKeyEncipherment) {
		t.Errorf("unexpected KeyUsage: %v", cert.KeyUsage)
	}
	if len(cert.ExtKeyUsage) != 1 || cert.ExtKeyUsage[0] != x509.ExtKeyUsageServerAuth {
		t.Errorf("unexpected ExtKeyUsage: %v", cert.ExtKeyUsage)
	}
}

func TestNewCertificate_Errors(t *testing.T) {
	csr, _ := generateCSR(t, "fail.example.com", nil, nil, nil)

	// Invalidate CSR signature
	otherPriv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
	if err != nil {
		t.Fatalf("failed to generate key: %v", err)
	}
	csr.PublicKey = &otherPriv.PublicKey

	if _, err := x509util.NewCertificate(csr); err == nil {
		t.Error("expected error for CSR with invalid signature, got nil")
	}

	// Invalid template syntax
	validCSR, _ := generateCSR(t, "valid.example.com", nil, nil, nil)
	badTemplateOpt := x509util.WithTemplate(`{{ fail "template execution failed" }}`, x509util.CreateTemplateData("valid.example.com", nil))
	if _, err := x509util.NewCertificate(validCSR, badTemplateOpt); err == nil {
		t.Error("expected error for failing template, got nil")
	}
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify go.step.sm/crypto/x509util.NewCertificate in pkg:golang/go.step.sm/crypto@v0.44.6",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.step.sm/crypto@v0.44.6"
  ],
  "symbols": [
    "go.step.sm/crypto/x509util.NewCertificate"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

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