Repository: sigstore/rekor
Pull request #358 (2021-07-07 17:15:35)

Adopt new signing/verification APIs from sigstore
This uses the new APIs introduced in `sigstore/sigstore/pkg/signature` and removes most of the calls directly to the golang crypto APIs.

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Patch:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8b1b1b6..34b44b7 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -70,6 +70,8 @@ jobs:
       - uses: actions/checkout@v2.3.4
       - name: Docker Build
         run: docker-compose build
+      - name: Extract version of Go to use
+        run: echo "GOVERSION=$(cat Dockerfile|grep golang | awk ' { print $2 } ' | sed -r 's/^.*://g'| uniq)" >> $GITHUB_ENV
       - uses: actions/setup-go@v2
         with:
           go-version: ${{ env.GOVERSION }}
diff --git a/.github/workflows/verify.yml b/.github/workflows/verify.yml
index 35c9413..253bbf5 100644
--- a/.github/workflows/verify.yml
+++ b/.github/workflows/verify.yml
@@ -23,9 +23,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2.3.4
+      - name: Extract version of Go to use
+        run: echo "GOVERSION=$(cat Dockerfile|grep golang | awk ' { print $2 } ' | sed -r 's/^.*://g'| uniq)" >> $GITHUB_ENV
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.16'
+          go-version: ${{ env.GOVERSION }}
       - name: Install addlicense
         run: go install github.com/google/addlicense@latest
       - name: Check license headers
diff --git a/go.mod b/go.mod
index 3346b94..bddfe4a 100644
--- a/go.mod
+++ b/go.mod
@@ -29,13 +29,11 @@ require (
 	github.com/prometheus/client_golang v1.11.0
 	github.com/rs/cors v1.8.0
 	github.com/sassoftware/relic v0.0.0-20210427151427-dfb082b79b74
-	github.com/sigstore/sigstore v0.0.0-20210415112811-cb2061113e4a
+	github.com/sigstore/sigstore v0.0.0-20210707163508-5b6fffda16e4
 	github.com/spf13/cobra v1.2.1
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.8.1
-	github.com/ulikunitz/xz v0.5.9 // indirect
 	github.com/urfave/negroni v1.0.0
-	github.com/zalando/go-keyring v0.1.1 // indirect
 	go.uber.org/goleak v1.1.10
 	go.uber.org/zap v1.18.1
 	gocloud.dev v0.23.0
@@ -43,7 +41,6 @@ require (
 	golang.org/x/mod v0.4.2
 	golang.org/x/net v0.0.0-20210505214959-0714010a04ed
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf // indirect
 	google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c
 	google.golang.org/grpc v1.39.0
 	google.golang.org/protobuf v1.27.1
diff --git a/go.sum b/go.sum
index 4d0c50a..acc1951 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,4 @@
+bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8=
 bazil.org/fuse v0.0.0-20180421153158-65cc252bf669/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8=
 bitbucket.org/creachadair/shell v0.0.6/go.mod h1:8Qqi/cYk7vPnsOePHroKXDJYmb5x7ENhtiFtfZq8K+M=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
@@ -100,6 +101,7 @@ github.com/Azure/go-autorest/logger v0.2.1/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZ
 github.com/Azure/go-autorest/tracing v0.6.0/go.mod h1:+vhtPC754Xsa23ID7GlGsrdKBpUA79WCAKPPZVC2DeU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/DataDog/datadog-go v3.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
 github.com/GoogleCloudPlatform/cloudsql-proxy v0.0.0-20191009163259-e802c2cb94ae/go.mod h1:mjwGPas4yKduTyubHvD1Atl9r1rUq8DfVy+gkVvZ+oo=
 github.com/GoogleCloudPlatform/cloudsql-proxy v1.22.0/go.mod h1:mAm5O/zik2RFmcpigNjg6nMotDL8ZXJaxKzgGVcSMFA=
 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
@@ -111,6 +113,8 @@ github.com/Masterminds/semver/v3 v3.1.0/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0
 github.com/Masterminds/sprig v2.15.0+incompatible/go.mod h1:y6hNFY5UBTIWBxnzTeuNhlNS5hqE0NB0E6fgfo2Br3o=
 github.com/Masterminds/sprig v2.22.0+incompatible/go.mod h1:y6hNFY5UBTIWBxnzTeuNhlNS5hqE0NB0E6fgfo2Br3o=
 github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA=
+github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
+github.com/Microsoft/hcsshim v0.8.9/go.mod h1:5692vkUqntj1idxauYlpoINNKeqCiG6Sg38RRsjT5y8=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/OpenPeeDeeP/depguard v1.0.0/go.mod h1:7/4sitnI9YlQgTLLk734QlzXT8DuHVnAyztLplQjk+o=
@@ -121,6 +125,8 @@ github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbt
 github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
+github.com/ReneKroon/ttlcache/v2 v2.5.0 h1:Xy1Ou9kKVuoMtNU6dBcW+lzGDUHweoZt9Fk1HfGiCTk=
+github.com/ReneKroon/ttlcache/v2 v2.5.0/go.mod h1:zbo6Pv/28e21Z8CzzqgYRArQYGYtjONRxaAKGxzQvG4=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
@@ -134,6 +140,7 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuy
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
+github.com/alvaroloes/enumer v1.1.2/go.mod h1:FxrjvuXoDAx9isTJrv4c+T410zFi0DtXIT0m65DJ+Wo=
 github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
@@ -149,7 +156,10 @@ github.com/aphistic/sweet v0.2.0/go.mod h1:fWDlIh/isSE9n6EPsRmC0det+whmX6dJid3st
 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
+github.com/armon/go-metrics v0.3.0/go.mod h1:zXjbSimjXTd7vOpY8B0/2LpvNvDoXBuplAD+gJD3GYs=
+github.com/armon/go-metrics v0.3.3/go.mod h1:4O98XIr/9W0sxpJ8UaYkvjk10Iff7SnFrb4QAOwNTFc=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
 github.com/aryann/difflib v0.0.0-20170710044230-e206f873d14a/go.mod h1:DAHtR1m6lCRdSC2Tm3DSWRPvIPr6xNKyeHdqDQSQT+A=
 github.com/asaskevich/govalidator v0.0.0-20180720115003-f9ffefc3facf/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
@@ -166,7 +176,9 @@ github.com/aws/aws-sdk-go v1.19.45/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpi
 github.com/aws/aws-sdk-go v1.20.6/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go v1.23.20/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go v1.25.11/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
+github.com/aws/aws-sdk-go v1.25.37/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go v1.27.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
+github.com/aws/aws-sdk-go v1.30.27/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
 github.com/aws/aws-sdk-go v1.34.28/go.mod h1:H7NKnBqNVzoTJpGfLrQkkD+ytBA93eiDYi/+8rV9s48=
 github.com/aws/aws-sdk-go v1.38.35 h1:7AlAO0FC+8nFjxiGKEmq0QLpiA8/XFr6eIxgRTwkdTg=
 github.com/aws/aws-sdk-go v1.38.35/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
@@ -207,6 +219,8 @@ github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XL
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
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+github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag=
+github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp5jckzBHf4XRpQvBOLI+I=
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@@ -220,8 +234,18 @@ github.com/cockroachdb/logtags v0.0.0-20190617123548-eb05cc24525f/go.mod h1:i/u9
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
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+github.com/containerd/console v0.0.0-20180822173158-c12b1e7919c1/go.mod h1:Tj/on1eG8kiEhd0+fhSDzsPAFESxzBBvdyEgyryXffw=
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+github.com/containerd/containerd v1.3.2/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA=
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@@ -261,6 +285,7 @@ github.com/dimchansky/utfbom v1.1.1/go.mod h1:SxdoEBH5qIqFocHMyGOXVAybYJdr71b1Q/
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@@ -291,12 +316,15 @@ github.com/etcd-io/gofail v0.0.0-20190801230047-ad7f989257ca/go.mod h1:49H/RkXP8
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@@ -313,6 +341,7 @@ github.com/gin-gonic/gin v1.6.3/go.mod h1:75u5sXoLsGZoRN5Sgbi1eraJ4GU3++wFwWzhwv
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@@ -324,6 +353,8 @@ github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2
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@@ -448,6 +479,8 @@ github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfC
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@@ -491,6 +524,7 @@ github.com/gobwas/glob v0.2.3/go.mod h1:d3Ez4x06l9bZtSvzIay5+Yzi0fmZzPgnTbPcKjJA
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@@ -649,6 +683,7 @@ github.com/goreleaser/nfpm v1.2.1/go.mod h1:TtWrABZozuLOttX2uDlYyECfQX7x5XYkVxhj
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@@ -669,21 +704,42 @@ github.com/hashicorp/consul/api v1.3.0/go.mod h1:MmDNSzIMUjNpY/mQ398R4bk2FnqQLoP
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@@ -691,6 +747,12 @@ github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO
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@@ -715,6 +777,7 @@ github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJS
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@@ -806,6 +869,7 @@ github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaO
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@@ -841,7 +905,9 @@ github.com/mitchellh/go-homedir v1.0.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrk
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@@ -920,6 +993,8 @@ github.com/otiai10/mint v1.3.0/go.mod h1:F5AjcsTsWUqX+Na9fpHb52P8pcRX2CI6A3ctIT9
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@@ -932,7 +1007,10 @@ github.com/pelletier/go-toml v1.9.3/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCko
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@@ -943,11 +1021,13 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
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@@ -1001,7 +1084,9 @@ github.com/rs/cors v1.8.0/go.mod h1:EBwu+T5AvHOcXwvZIkQFjUN6s8Czyqw12GL/Y0tUyRM=
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@@ -1020,8 +1105,11 @@ github.com/shurcooL/go v0.0.0-20180423040247-9e1955d9fb6e/go.mod h1:TDJrrUr11Vxr
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@@ -1051,6 +1139,7 @@ github.com/spf13/cast v1.2.0/go.mod h1:r2rcYCSwa1IExKTDiTfzaxqT2FNHs8hODu4LnUfgK
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@@ -1064,6 +1153,7 @@ github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb6
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@@ -1094,6 +1184,10 @@ github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5Cc
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@@ -1108,6 +1202,7 @@ github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20200427203606-3cfed13b9966/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/tomasen/realip v0.0.0-20180522021738-f0c99a92ddce/go.mod h1:o8v6yHRoik09Xen7gje4m9ERNah1d1PPsVq1VEx9vE4=
+github.com/tv42/httpunix v0.0.0-20150427012821-b75d8614f926/go.mod h1:9ESjWnEqriFuLhtthL60Sar/7RFoluCcXsuvEwTV5KM=
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@@ -1117,6 +1212,7 @@ github.com/ulikunitz/xz v0.5.7/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oW
 github.com/ulikunitz/xz v0.5.9 h1:RsKRIA2MO8x56wkkcd3LbtcE/uMszhb6DpRf+3uwa3I=
 github.com/ulikunitz/xz v0.5.9/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
 github.com/ultraware/funlen v0.0.1/go.mod h1:Dp4UiAus7Wdb9KUZsYWZEWiRzGuM2kXM1lPbfaF6xhA=
+github.com/urfave/cli v0.0.0-20171014202726-7bc6a0acffa5/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
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@@ -1210,6 +1306,7 @@ go.uber.org/zap v1.18.1/go.mod h1:xg/QME4nWcxGxrpdeYfq7UvYrLh66cuVKdrbD1XF/NI=
 gocloud.dev v0.19.0/go.mod h1:SmKwiR8YwIMMJvQBKLsC3fHNyMwXLw3PMDO+VVteJMI=
 gocloud.dev v0.23.0 h1:u/6F8slWwaZPgGpjpNp0jzH+1P/M2ri7qEP3lFgbqBE=
 gocloud.dev v0.23.0/go.mod h1:zklCCIIo1N9ELkU2S2E7tW8P8eeMU7oGLeQCXdDwx9Q=
+golang.org/x/crypto v0.0.0-20171113213409-9f005a07e0d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20180501155221-613d6eafa307/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
@@ -1219,7 +1316,9 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
 golang.org/x/crypto v0.0.0-20190313024323-a1f597ede03a/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190320223903-b7391e95e576/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190325154230-a5d413f7728c/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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@@ -1308,6 +1407,7 @@ golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191002035440-2ec189313ef0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20191004110552-13f9640d40b9/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191112182307-2180aed22343/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191119073136-fc4aabc6c914/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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@@ -1384,6 +1484,7 @@ golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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@@ -1395,6 +1496,7 @@ golang.org/x/sys v0.0.0-20190419153524-e8e3143a4f4a/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -1404,6 +1506,7 @@ golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -1429,6 +1532,7 @@ golang.org/x/sys v0.0.0-20200501052902-10377860bb8e/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -1508,11 +1612,13 @@ golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBn
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@@ -1569,6 +1675,7 @@ golang.org/x/tools v0.0.0-20201208233053-a543418bbed2/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/tools v0.0.0-20210105154028-b0ab187a4818/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
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 golang.org/x/tools v0.0.0-20210108195828-e2f9c7f1fc8e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
+golang.org/x/tools v0.0.0-20210112230658-8b4aab62c064/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
 golang.org/x/tools v0.1.2 h1:kRBLX7v7Af8W7Gdbbc908OJcdgtK8bOz9Uaj8/F1ACA=
 golang.org/x/tools v0.1.2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
@@ -1677,12 +1784,14 @@ google.golang.org/genproto v0.0.0-20210506142907-4a47615972c2/go.mod h1:P3QM42oQ
 google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c h1:wtujag7C+4D6KMoulW9YauvK2lgdvCMS260jsqqBXr0=
 google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
 google.golang.org/grpc v1.8.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
+google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.0/go.mod h1:chYK+tFQF0nDUGJgXMSgLCQk3phJEuONr2DCgLDdAQM=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.22.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.22.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
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@@ -1742,6 +1851,7 @@ gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/ini.v1 v1.62.0 h1:duBzk771uxoUuOlyRLkHsygud9+5lrlGjdFBb4mSKDU=
 gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/square/go-jose.v2 v2.5.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/src-d/go-billy.v4 v4.3.2/go.mod h1:nDjArDMp+XMs1aFAESLRjfGSgfvoYN0hDfzEk0GjC98=
 gopkg.in/src-d/go-git-fixtures.v3 v3.5.0/go.mod h1:dLBcvytrw/TYZsNTWCnkNF2DSIlzWYqTe3rJR56Ac7g=
@@ -1764,6 +1874,7 @@ gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
+gotest.tools/v3 v3.0.2/go.mod h1:3SzNCllyD9/Y+b5r9JIKQ474KzkZyqLqEfYqMsX94Bk=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/pkg/api/api.go b/pkg/api/api.go
index f58223c..490a37a 100644
--- a/pkg/api/api.go
+++ b/pkg/api/api.go
@@ -21,7 +21,6 @@ import (
 	"crypto/x509"
 	"encoding/base64"
 	"encoding/hex"
-	"encoding/pem"
 	"fmt"
 	"time"
 
@@ -36,7 +35,9 @@ import (
 	pki "github.com/sigstore/rekor/pkg/pki/x509"
 	"github.com/sigstore/rekor/pkg/signer"
 	"github.com/sigstore/rekor/pkg/storage"
+	"github.com/sigstore/sigstore/pkg/cryptoutils"
 	"github.com/sigstore/sigstore/pkg/signature"
+	"github.com/sigstore/sigstore/pkg/signature/options"
 )
 
 func dial(ctx context.Context, rpcServer string) (*grpc.ClientConn, error) {
@@ -94,7 +95,7 @@ func NewAPI() (*API, error) {
 	if err != nil {
 		return nil, errors.Wrap(err, "getting new signer")
 	}
-	pk, err := rekorSigner.PublicKey(ctx)
+	pk, err := rekorSigner.PublicKey(options.WithContext(ctx))
 	if err != nil {
 		return nil, errors.Wrap(err, "getting public key")
 	}
@@ -104,10 +105,7 @@ func NewAPI() (*API, error) {
 	}
 	pubkeyHashBytes := sha256.Sum256(b)
 
-	pubkey := pem.EncodeToMemory(&pem.Block{
-		Type:  "PUBLIC KEY",
-		Bytes: b,
-	})
+	pubkey := cryptoutils.PEMEncode(cryptoutils.PublicKeyPEMType, b)
 
 	verifier, err := client.NewLogVerifierFromTree(t)
 	if err != nil {
diff --git a/pkg/api/entries.go b/pkg/api/entries.go
index 54fc1ec..9f32b9f 100644
--- a/pkg/api/entries.go
+++ b/pkg/api/entries.go
@@ -16,6 +16,7 @@
 package api
 
 import (
+	"bytes"
 	"context"
 	"encoding/hex"
 	"errors"
@@ -40,6 +41,7 @@ import (
 	"github.com/sigstore/rekor/pkg/log"
 	"github.com/sigstore/rekor/pkg/types"
 	"github.com/sigstore/sigstore/pkg/signature"
+	"github.com/sigstore/sigstore/pkg/signature/options"
 )
 
 func signEntry(ctx context.Context, signer signature.Signer, entry models.LogEntryAnon) ([]byte, error) {
@@ -51,7 +53,7 @@ func signEntry(ctx context.Context, signer signature.Signer, entry models.LogEnt
 	if err != nil {
 		return nil, fmt.Errorf("canonicalizing error: %v", err)
 	}
-	signature, _, err := signer.Sign(ctx, canonicalized)
+	signature, err := signer.SignMessage(bytes.NewReader(canonicalized), options.WithContext(ctx))
 	if err != nil {
 		return nil, fmt.Errorf("signing error: %v", err)
 	}
diff --git a/pkg/api/tlog.go b/pkg/api/tlog.go
index 7080a1f..a5b7658 100644
--- a/pkg/api/tlog.go
+++ b/pkg/api/tlog.go
@@ -16,6 +16,7 @@
 package api
 
 import (
+	"bytes"
 	"encoding/base64"
 	"encoding/binary"
 	"encoding/hex"
@@ -32,6 +33,7 @@ import (
 	"github.com/sigstore/rekor/pkg/generated/models"
 	"github.com/sigstore/rekor/pkg/generated/restapi/operations/tlog"
 	"github.com/sigstore/rekor/pkg/util"
+	"github.com/sigstore/sigstore/pkg/signature/options"
 )
 
 // GetLogInfoHandler returns the current size of the tree and the STH
@@ -63,10 +65,24 @@ func GetLogInfoHandler(params tlog.GetLogInfoParams) middleware.Responder {
 	}
 	sth.SetTimestamp(uint64(time.Now().UnixNano()))
 	// TODO: once api.signer implements crypto.Signer, switch to using Sign() API on Checkpoint
+	// var opts crypto.SignerOpts
+	// cs, ok := api.signer.(crypto.Signer)
+	// if !ok {
+	// 	kmsSigner, ok := api.signer.(kms.SignerVerifier)
+	// 	if !ok {
+	// 		return handleRekorAPIError(params, http.StatusInternalServerError, errors.New("unable to cast to crypto.Signer"), signingError)
+	// 	}
+	// 	var err error
+	// 	cs, opts, err = kmsSigner.CryptoSigner(params.HTTPRequest.Context(), nil)
+	// 	if err != nil {
+	// 		return handleRekorAPIError(params, http.StatusInternalServerError, fmt.Errorf("unable to obtain crypto.Signer: %v", err), signingError)
+	// 	}
+	// }
+	// sth.Checkpoint.Sign(viper.GetString("rekor_server.hostname"), cs, opts)
 
 	// sign the log root ourselves to get the log root signature
 	cpString, _ := sth.Checkpoint.MarshalText()
-	sig, _, err := api.signer.Sign(params.HTTPRequest.Context(), []byte(cpString))
+	sig, err := api.signer.SignMessage(bytes.NewReader(cpString), options.WithContext(params.HTTPRequest.Context()))
 	if err != nil {
 		return handleRekorAPIError(params, http.StatusInternalServerError, fmt.Errorf("signing error: %w", err), signingError)
 	}
diff --git a/pkg/pki/minisign/minisign.go b/pkg/pki/minisign/minisign.go
index 22bc3b0..0bd6951 100644
--- a/pkg/pki/minisign/minisign.go
+++ b/pkg/pki/minisign/minisign.go
@@ -17,14 +17,13 @@ package minisign
 
 import (
 	"bytes"
-	"crypto/ed25519"
 	"encoding/base64"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"strings"
 
 	minisign "github.com/jedisct1/go-minisign"
+	"github.com/sigstore/sigstore/pkg/signature"
 )
 
 // Signature Signature that follows the minisign standard; supports both minisign and signify generated signatures
@@ -99,16 +98,11 @@ func (s Signature) Verify(r io.Reader, k interface{}) error {
 		return fmt.Errorf("minisign public key has not been initialized")
 	}
 
-	msg, err := ioutil.ReadAll(r)
+	verifier, err := signature.LoadED25519Verifier(key.key.PublicKey[:])
 	if err != nil {
-		return fmt.Errorf("error reading message to verify signature: %w", err)
+		return err
 	}
-
-	if !ed25519.Verify(ed25519.PublicKey(key.key.PublicKey[:]), msg, s.signature.Signature[:]) {
-		return fmt.Errorf("verification of signed message failed")
-	}
-
-	return nil
+	return verifier.VerifySignature(bytes.NewReader(s.signature.Signature[:]), r)
 }
 
 // PublicKey Public Key that follows the minisign standard; supports signify and minisign public keys
diff --git a/pkg/pki/x509/x509.go b/pkg/pki/x509/x509.go
index c7801e2..c452614 100644
--- a/pkg/pki/x509/x509.go
+++ b/pkg/pki/x509/x509.go
@@ -18,10 +18,6 @@ package x509
 import (
 	"bytes"
 	"crypto"
-	"crypto/ecdsa"
-	"crypto/ed25519"
-	"crypto/rsa"
-	"crypto/sha256"
 	"crypto/x509"
 	"encoding/asn1"
 	"encoding/pem"
@@ -32,6 +28,8 @@ import (
 	"strings"
 
 	"github.com/go-playground/validator"
+	"github.com/sigstore/sigstore/pkg/cryptoutils"
+	"github.com/sigstore/sigstore/pkg/signature"
 )
 
 // EmailAddressOID defined by https://oidref.com/1.2.840.113549.1.9.1
@@ -64,14 +62,6 @@ func (s Signature) Verify(r io.Reader, k interface{}) error {
 		return fmt.Errorf("X509 signature has not been initialized")
 	}
 
-	hasher := sha256.New()
-	tee := io.TeeReader(r, hasher)
-	message, err := ioutil.ReadAll(tee)
-	if err != nil {
-		return err
-	}
-	hash := hasher.Sum(nil)
-
 	key, ok := k.(*PublicKey)
 	if !ok {
 		return fmt.Errorf("invalid public key type for: %v", k)
@@ -82,22 +72,11 @@ func (s Signature) Verify(r io.Reader, k interface{}) error {
 		p = key.cert.c.PublicKey
 	}
 
-	switch pub := p.(type) {
-	case *rsa.PublicKey:
-		return rsa.VerifyPKCS1v15(pub, crypto.SHA256, hash, s.signature)
-	case ed25519.PublicKey:
-		if ed25519.Verify(pub, message, s.signature) {
-			return nil
-		}
-		return errors.New("supplied signature does not match key")
-	case *ecdsa.PublicKey:
-		if ecdsa.VerifyASN1(pub, hash, s.signature) {
-			return nil
-		}
-		return errors.New("supplied signature does not match key")
-	default:
-		return fmt.Errorf("invalid public key type: %T", pub)
+	verifier, err := signature.LoadVerifier(p, crypto.SHA256)
+	if err != nil {
+		return err
 	}
+	return verifier.VerifySignature(bytes.NewReader(s.signature), r)
 }
 
 // PublicKey Public Key that follows the x509 standard
@@ -124,13 +103,13 @@ func NewPublicKey(r io.Reader) (*PublicKey, error) {
 	}
 
 	switch block.Type {
-	case "PUBLIC KEY":
+	case string(cryptoutils.PublicKeyPEMType):
 		key, err := x509.ParsePKIXPublicKey(block.Bytes)
 		if err != nil {
 			return nil, err
 		}
 		return &PublicKey{key: key}, nil
-	case "CERTIFICATE":
+	case string(cryptoutils.CertificatePEMType):
 		c, err := x509.ParseCertificate(block.Bytes)
 		if err != nil {
 			return nil, err
@@ -145,34 +124,18 @@ func NewPublicKey(r io.Reader) (*PublicKey, error) {
 }
 
 // CanonicalValue implements the pki.PublicKey interface
-func (k PublicKey) CanonicalValue() ([]byte, error) {
+func (k PublicKey) CanonicalValue() (encoded []byte, err error) {
 
-	var p pem.Block
 	switch {
 	case k.key != nil:
-		b, err := x509.MarshalPKIXPublicKey(k.key)
-		if err != nil {
-			return nil, err
-		}
-
-		p = pem.Block{
-			Type:  "PUBLIC KEY",
-			Bytes: b,
-		}
+		encoded, err = cryptoutils.MarshalPublicKeyToPEM(k.key)
 	case k.cert != nil:
-		p = pem.Block{
-			Type:  "CERTIFICATE",
-			Bytes: k.cert.b,
-		}
+		encoded, err = cryptoutils.MarshalCertificateToPEM(k.cert.c)
 	default:
-		return nil, fmt.Errorf("x509 public key has not been initialized")
+		err = fmt.Errorf("x509 public key has not been initialized")
 	}
 
-	var buf bytes.Buffer
-	if err := pem.Encode(&buf, &p); err != nil {
-		return nil, err
-	}
-	return buf.Bytes(), nil
+	return
 }
 
 func (k PublicKey) CryptoPubKey() crypto.PublicKey {
diff --git a/pkg/signer/memory.go b/pkg/signer/memory.go
index 4cfe5e9..04f3784 100644
--- a/pkg/signer/memory.go
+++ b/pkg/signer/memory.go
@@ -106,11 +106,11 @@ func NewTimestampingCertWithSelfSignedCA(pub crypto.PublicKey) ([]*x509.Certific
 
 func NewMemory() (*Memory, error) {
 	// generate a keypair
-	privKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	sv, _, err := signature.NewECDSASignerVerifier(elliptic.P256(), rand.Reader, crypto.SHA256)
 	if err != nil {
-		return nil, errors.Wrap(err, "generating private key")
+		return nil, err
 	}
 	return &Memory{
-		ECDSASignerVerifier: signature.NewECDSASignerVerifier(privKey, crypto.SHA256),
+		ECDSASignerVerifier: *sv,
 	}, nil
 }
diff --git a/pkg/signer/signer.go b/pkg/signer/signer.go
index c37d818..485d0cc 100644
--- a/pkg/signer/signer.go
+++ b/pkg/signer/signer.go
@@ -21,14 +21,14 @@ import (
 	"fmt"
 	"strings"
 
-	"github.com/sigstore/sigstore/pkg/kms/gcp"
 	"github.com/sigstore/sigstore/pkg/signature"
+	"github.com/sigstore/sigstore/pkg/signature/kms/gcp"
 )
 
 func New(ctx context.Context, signer string) (signature.Signer, error) {
 	switch {
 	case strings.HasPrefix(signer, gcp.ReferenceScheme):
-		return gcp.NewGCP(ctx, signer)
+		return gcp.LoadSignerVerifier(ctx, signer)
 	case signer == MemoryScheme:
 		return NewMemory()
 	default:
diff --git a/pkg/types/alpine/apk.go b/pkg/types/alpine/apk.go
index 2481693..02906a1 100644
--- a/pkg/types/alpine/apk.go
+++ b/pkg/types/alpine/apk.go
@@ -21,8 +21,6 @@ import (
 	"bytes"
 	"compress/gzip"
 	"crypto"
-	"crypto/ecdsa"
-	"crypto/rsa"
 	"crypto/sha1" // #nosec G505
 	"crypto/sha256"
 	"encoding/hex"
@@ -33,6 +31,8 @@ import (
 	"strings"
 
 	"github.com/pkg/errors"
+	"github.com/sigstore/sigstore/pkg/signature"
+	"github.com/sigstore/sigstore/pkg/signature/options"
 	"gopkg.in/ini.v1"
 )
 
@@ -217,17 +217,11 @@ func (p Package) VerifySignature(pub crypto.PublicKey) error {
 		return errors.New("no digest value for data.tar.gz known")
 	}
 
-	switch pk := pub.(type) {
-	case *rsa.PublicKey:
-		return rsa.VerifyPKCS1v15(pk, crypto.SHA1, p.controlSHA1Digest, p.Signature)
-	case *ecdsa.PublicKey:
-		if !ecdsa.VerifyASN1(pk, p.controlSHA1Digest, p.Signature) {
-			return errors.New("failed to verify ECDSA signature")
-		}
-	default:
-		return errors.New("unknown key algorithm")
+	verifier, err := signature.LoadVerifier(pub, crypto.SHA1)
+	if err != nil {
+		return err
 	}
-	return nil
+	return verifier.VerifySignature(bytes.NewReader(p.Signature), nil, options.WithDigest(p.controlSHA1Digest), options.WithCryptoSignerOpts(crypto.SHA1))
 }
 
 // parsePkginfo parses the .PKGINFO file which is in a
diff --git a/pkg/types/intoto/v0.0.1/entry.go b/pkg/types/intoto/v0.0.1/entry.go
index 8e7c944..f9e44fb 100644
--- a/pkg/types/intoto/v0.0.1/entry.go
+++ b/pkg/types/intoto/v0.0.1/entry.go
@@ -19,7 +19,6 @@ import (
 	"bytes"
 	"context"
 	"crypto"
-	"crypto/rand"
 	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
@@ -34,8 +33,12 @@ import (
 	"github.com/sigstore/rekor/pkg/generated/models"
 	"github.com/sigstore/rekor/pkg/log"
 	"github.com/sigstore/rekor/pkg/pki"
+	"github.com/sigstore/rekor/pkg/pki/x509"
 	"github.com/sigstore/rekor/pkg/types"
 	"github.com/sigstore/rekor/pkg/types/intoto"
+	"github.com/sigstore/sigstore/pkg/cryptoutils"
+	"github.com/sigstore/sigstore/pkg/signature"
+	"github.com/sigstore/sigstore/pkg/signature/options"
 )
 
 const (
@@ -142,7 +145,12 @@ func (v *V001Entry) Canonicalize(ctx context.Context) ([]byte, error) {
 // Validate performs cross-field validation for fields in object
 func (v *V001Entry) Validate() error {
 	// TODO handle multiple
-	sslVerifier, err := ssl.NewEnvelopeSigner(&verifier{pub: v.keyObj})
+	pk := v.keyObj.(*x509.PublicKey)
+	vfr, err := signature.LoadVerifier(pk.CryptoPubKey(), crypto.SHA256)
+	if err != nil {
+		return err
+	}
+	sslVerifier, err := ssl.NewEnvelopeSigner(&verifier{v: vfr})
 	if err != nil {
 		return err
 	}
@@ -166,30 +174,33 @@ func (v *V001Entry) Attestation() (string, []byte) {
 }
 
 type verifier struct {
-	pub    pki.PublicKey
-	signer crypto.Signer
+	s signature.Signer
+	v signature.Verifier
 }
 
-func (v *verifier) Sign(d []byte) ([]byte, string, error) {
-	if v.signer == nil {
+func (v *verifier) Sign(data []byte) (sig []byte, pubKey string, err error) {
+	if v.s == nil {
 		return nil, "", errors.New("nil signer")
 	}
-	h := sha256.Sum256(d)
-	sig, err := v.signer.Sign(rand.Reader, h[:], crypto.SHA256)
+	sig, err = v.s.SignMessage(bytes.NewReader(data), options.WithCryptoSignerOpts(crypto.SHA256))
+	if err != nil {
+		return nil, "", err
+	}
+	pk, err := v.s.PublicKey()
 	if err != nil {
 		return nil, "", err
 	}
-	return sig, "", nil
+	pubKeyBytes, err := cryptoutils.MarshalPublicKeyToPEM(pk)
+	if err != nil {
+		return nil, "", err
+	}
+	pubKey = string(pubKeyBytes)
+	return
 }
 
 func (v *verifier) Verify(keyID string, data, sig []byte) error {
-	af := pki.NewArtifactFactory("x509")
-	s, err := af.NewSignature(bytes.NewReader(sig))
-	if err != nil {
-		return err
+	if v.v == nil {
+		return errors.New("nil verifier")
 	}
-	if err := s.Verify(bytes.NewReader(data), v.pub); err != nil {
-		return err
-	}
-	return nil
+	return v.v.VerifySignature(bytes.NewReader(sig), bytes.NewReader(data))
 }
diff --git a/pkg/util/pubkey.go b/pkg/util/pubkey.go
index 8327d7a..82d0904 100644
--- a/pkg/util/pubkey.go
+++ b/pkg/util/pubkey.go
@@ -18,12 +18,11 @@ package util
 import (
 	"context"
 	"crypto/ecdsa"
-	"crypto/x509"
-	"encoding/pem"
-	"errors"
 
+	"github.com/pkg/errors"
 	"github.com/sigstore/rekor/pkg/generated/client"
 	"github.com/sigstore/rekor/pkg/generated/client/pubkey"
+	"github.com/sigstore/sigstore/pkg/cryptoutils"
 )
 
 func PublicKey(ctx context.Context, c *client.Rekor) (*ecdsa.PublicKey, error) {
@@ -31,21 +30,15 @@ func PublicKey(ctx context.Context, c *client.Rekor) (*ecdsa.PublicKey, error) {
 	if err != nil {
 		return nil, err
 	}
-	pubKey := resp.GetPayload()
 
 	// marshal the pubkey
-	p, _ := pem.Decode([]byte(pubKey))
-	if p == nil {
-		return nil, errors.New("public key shouldn't be nil")
-	}
-
-	decoded, err := x509.ParsePKIXPublicKey(p.Bytes)
+	pubKey, err := cryptoutils.UnmarshalPEMToPublicKey([]byte(resp.GetPayload()))
 	if err != nil {
 		return nil, err
 	}
-	ed, ok := decoded.(*ecdsa.PublicKey)
+	ed, ok := pubKey.(*ecdsa.PublicKey)
 	if !ok {
-		return nil, err
+		return nil, errors.New("public key retrieved from Rekor is not an ECDSA key")
 	}
 	return ed, nil
 }
diff --git a/pkg/util/rfc3161.go b/pkg/util/rfc3161.go
index 75ddc2b..8d7bbad 100644
--- a/pkg/util/rfc3161.go
+++ b/pkg/util/rfc3161.go
@@ -16,6 +16,7 @@
 package util
 
 import (
+	"bytes"
 	"context"
 	"crypto"
 	"crypto/sha256"
@@ -30,6 +31,7 @@ import (
 	"github.com/sassoftware/relic/lib/pkcs9"
 	"github.com/sassoftware/relic/lib/x509tools"
 	"github.com/sigstore/sigstore/pkg/signature"
+	"github.com/sigstore/sigstore/pkg/signature/options"
 )
 
 type GeneralName struct {
@@ -217,7 +219,7 @@ func CreateRfc3161Response(ctx context.Context, req pkcs9.TimeStampReq, certChai
 		return nil, err
 	}
 	// Get signature.
-	signature, _, err := signer.Sign(ctx, attrBytes)
+	signature, err := signer.SignMessage(bytes.NewReader(attrBytes), options.WithContext(ctx))
 	if err != nil {
 		return nil, err
 	}


Test patch:
diff --git a/pkg/pki/x509/x509_test.go b/pkg/pki/x509/x509_test.go
index 3f81762..0de51f7 100644
--- a/pkg/pki/x509/x509_test.go
+++ b/pkg/pki/x509/x509_test.go
@@ -19,17 +19,14 @@ import (
 	"bytes"
 	"context"
 	"crypto"
-	"crypto/ecdsa"
-	"crypto/ed25519"
-	"crypto/rand"
-	"crypto/rsa"
-	"crypto/sha256"
 	"crypto/x509"
-	"encoding/pem"
 	"strings"
 	"testing"
 
 	"github.com/sigstore/rekor/pkg/signer"
+	"github.com/sigstore/sigstore/pkg/cryptoutils"
+	"github.com/sigstore/sigstore/pkg/signature"
+	"github.com/sigstore/sigstore/pkg/signature/options"
 )
 
 // Generated with:
@@ -82,27 +79,17 @@ MCowBQYDK2VwAyEAizWek2gKgMM+bad4rVJ5nc9NsbNOba0A0BNfzOgklRs=
 -----END PUBLIC KEY-----`
 
 func signData(t *testing.T, b []byte, pkey string) []byte {
-	// Get a private key object
-	p, _ := pem.Decode([]byte(pkey))
-	if p.Type != "PRIVATE KEY" {
-		t.Fatalf("expected private key, found object of type %s", p.Type)
-	}
-	pk, err := x509.ParsePKCS8PrivateKey(p.Bytes)
+
+	priv, err := cryptoutils.UnmarshalPEMToPrivateKey([]byte(pkey), cryptoutils.SkipPassword)
 	if err != nil {
 		t.Fatal(err)
 	}
-
-	h := sha256.Sum256(b)
-	var signature []byte
-	switch k := pk.(type) {
-	case *rsa.PrivateKey:
-		signature, err = rsa.SignPKCS1v15(rand.Reader, k, crypto.SHA256, h[:])
-	case *ecdsa.PrivateKey:
-		signature, err = ecdsa.SignASN1(rand.Reader, k, h[:])
-	case ed25519.PrivateKey:
-		signature = ed25519.Sign(k, b)
+	signer, err := signature.LoadSigner(priv, crypto.SHA256)
+	if err != nil {
+		t.Fatal(err)
 	}
 
+	signature, err := signer.SignMessage(bytes.NewReader(b))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -224,7 +211,7 @@ func TestCertChain_Verify(t *testing.T) {
 	}
 	// A properly created cert chain should encode to PEM OK.
 	ctx := context.Background()
-	pk, err := mem.PublicKey(ctx)
+	pk, err := mem.PublicKey(options.WithContext(ctx))
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/pkg/signer/memory_test.go b/pkg/signer/memory_test.go
index 5ff42c8..3e4a814 100644
--- a/pkg/signer/memory_test.go
+++ b/pkg/signer/memory_test.go
@@ -17,11 +17,14 @@ limitations under the License.
 package signer
 
 import (
+	"bytes"
 	"context"
-	"crypto/ecdsa"
-	"crypto/sha256"
+	"crypto"
 	"crypto/x509"
 	"testing"
+
+	"github.com/sigstore/sigstore/pkg/signature"
+	"github.com/sigstore/sigstore/pkg/signature/options"
 )
 
 func TestMemory(t *testing.T) {
@@ -34,36 +37,39 @@ func TestMemory(t *testing.T) {
 	payload := []byte("payload")
 
 	// sign a payload
-	signature, _, err := m.Sign(ctx, payload)
+	sig, err := m.SignMessage(bytes.NewReader(payload), options.WithContext(ctx))
 	if err != nil {
 		t.Fatalf("signing payload: %v", err)
 	}
 
 	// verify the signature against public key
-	pubKey, err := m.PublicKey(ctx)
+	pubKey, err := m.PublicKey(options.WithContext(ctx))
 	if err != nil {
 		t.Fatalf("public key: %v", err)
 	}
 
-	pk, ok := pubKey.(*ecdsa.PublicKey)
-	if !ok {
-		t.Fatalf("ecdsa public key: %v", err)
+	verifier, err := signature.LoadVerifier(pubKey, crypto.SHA256)
+	if err != nil {
+		t.Fatalf("initializing verifier: %v", err)
 	}
 
-	h := sha256.Sum256(payload)
-
-	if !ecdsa.VerifyASN1(pk, h[:], signature) {
-		t.Fatalf("unable to verify signature")
+	if err := verifier.VerifySignature(bytes.NewReader(sig), bytes.NewReader(payload), options.WithContext(ctx)); err != nil {
+		t.Fatalf("verification failed: %v", err)
 	}
 
 	// verify signature using the cert's public key
-	certChain, err := NewTimestampingCertWithSelfSignedCA(pk)
-	pkCert, ok := certChain[0].PublicKey.(*ecdsa.PublicKey)
-	if !ok {
-		t.Fatalf("cert ecdsa public key: %v", err)
+	certChain, err := NewTimestampingCertWithSelfSignedCA(pubKey)
+	if err != nil {
+		t.Fatalf("generating timestamping cert: %v", err)
+	}
+	pkCert := certChain[0].PublicKey
+
+	verifier, err = signature.LoadVerifier(pkCert, crypto.SHA256)
+	if err != nil {
+		t.Fatalf("initializing cert pub key verifier: %v", err)
 	}
-	if !ecdsa.VerifyASN1(pkCert, h[:], signature) {
-		t.Fatalf("unable to verify signature")
+	if err := verifier.VerifySignature(bytes.NewReader(sig), bytes.NewReader(payload), options.WithContext(ctx)); err != nil {
+		t.Fatalf("verification failed: %v", err)
 	}
 	// verify that the cert chain is configured for timestamping
 	roots := x509.NewCertPool()
diff --git a/pkg/types/intoto/v0.0.1/entry_test.go b/pkg/types/intoto/v0.0.1/entry_test.go
index dfa3e4b..98c3c9d 100644
--- a/pkg/types/intoto/v0.0.1/entry_test.go
+++ b/pkg/types/intoto/v0.0.1/entry_test.go
@@ -16,6 +16,7 @@
 package intoto
 
 import (
+	"crypto"
 	"crypto/ecdsa"
 	"crypto/elliptic"
 	"crypto/rand"
@@ -31,6 +32,7 @@ import (
 	"github.com/in-toto/in-toto-golang/in_toto"
 	"github.com/in-toto/in-toto-golang/pkg/ssl"
 	"github.com/sigstore/rekor/pkg/generated/models"
+	"github.com/sigstore/sigstore/pkg/signature"
 	"go.uber.org/goleak"
 )
 
@@ -52,9 +54,11 @@ func p(b []byte) *strfmt.Base64 {
 
 func envelope(t *testing.T, k *ecdsa.PrivateKey, payload, payloadType string) string {
 
-	signer, err := in_toto.NewSSLSigner(&verifier{
-		signer: k,
-	})
+	s, err := signature.LoadECDSASigner(k, crypto.SHA256)
+	if err != nil {
+		t.Fatal(err)
+	}
+	signer, err := in_toto.NewSSLSigner(&verifier{s: s})
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/pkg/util/rfc3161_test.go b/pkg/util/rfc3161_test.go
index 728782b..7b293d5 100644
--- a/pkg/util/rfc3161_test.go
+++ b/pkg/util/rfc3161_test.go
@@ -29,6 +29,7 @@ import (
 	"github.com/sassoftware/relic/lib/pkcs9"
 	"github.com/sassoftware/relic/lib/x509tools"
 	"github.com/sigstore/rekor/pkg/signer"
+	"github.com/sigstore/sigstore/pkg/signature/options"
 )
 
 func TestCreateTimestampRequest(t *testing.T) {
@@ -131,7 +132,7 @@ func TestCreateRFC3161Response(t *testing.T) {
 	if err != nil {
 		t.Error(err)
 	}
-	pk, err := mem.PublicKey(ctx)
+	pk, err := mem.PublicKey(options.WithContext(ctx))
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/tests/e2e_test.go b/tests/e2e_test.go
index 7d09c8b..3cf2bea 100644
--- a/tests/e2e_test.go
+++ b/tests/e2e_test.go
@@ -20,6 +20,7 @@ package e2e
 import (
 	"bytes"
 	"context"
+	"crypto"
 	"crypto/ecdsa"
 	"crypto/sha256"
 	"crypto/x509"
@@ -51,6 +52,9 @@ import (
 	"github.com/sigstore/rekor/pkg/signer"
 	rekord "github.com/sigstore/rekor/pkg/types/rekord/v0.0.1"
 	"github.com/sigstore/rekor/pkg/util"
+	"github.com/sigstore/sigstore/pkg/cryptoutils"
+	"github.com/sigstore/sigstore/pkg/signature"
+	"github.com/sigstore/sigstore/pkg/signature/options"
 )
 
 func getUUIDFromUploadOutput(t *testing.T, out string) string {
@@ -549,24 +553,19 @@ func TestSignedEntryTimestamp(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	signature, _, err := s.Sign(ctx, payload)
+	sig, err := s.SignMessage(bytes.NewReader(payload), options.WithContext(ctx))
 	if err != nil {
 		t.Fatal(err)
 	}
-	pubkey, err := s.PublicKey(ctx)
+	pubkey, err := s.PublicKey(options.WithContext(ctx))
 	if err != nil {
 		t.Fatal(err)
 	}
-	b, err := x509.MarshalPKIXPublicKey(pubkey)
+	pemBytes, err := cryptoutils.MarshalPublicKeyToPEM(pubkey)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	pemBytes := pem.EncodeToMemory(&pem.Block{
-		Type:  "PUBLIC KEY",
-		Bytes: b,
-	})
-
 	// submit our newly signed payload to rekor
 	rekorClient, err := client.GetRekorClient("http://localhost:3000")
 	if err != nil {
@@ -579,7 +578,7 @@ func TestSignedEntryTimestamp(t *testing.T) {
 				Content: strfmt.Base64(payload),
 			},
 			Signature: &models.RekordV001SchemaSignature{
-				Content: strfmt.Base64(signature),
+				Content: strfmt.Base64(sig),
 				Format:  models.RekordV001SchemaSignatureFormatX509,
 				PublicKey: &models.RekordV001SchemaSignaturePublicKey{
 					Content: strfmt.Base64(pemBytes),
@@ -601,7 +600,7 @@ func TestSignedEntryTimestamp(t *testing.T) {
 	logEntry := extractLogEntry(t, resp.GetPayload())
 
 	// verify the signature against the log entry (without the signature)
-	sig := logEntry.Verification.SignedEntryTimestamp
+	timestampSig := logEntry.Verification.SignedEntryTimestamp
 	logEntry.Verification = nil
 	payload, err = logEntry.MarshalBinary()
 	if err != nil {
@@ -617,9 +616,11 @@ func TestSignedEntryTimestamp(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	// verify the signature against the public key
-	h := sha256.Sum256(canonicalized)
-	if !ecdsa.VerifyASN1(rekorPubKey, h[:], []byte(sig)) {
+	verifier, err := signature.LoadVerifier(rekorPubKey, crypto.SHA256)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := verifier.VerifySignature(bytes.NewReader(timestampSig), bytes.NewReader(canonicalized), options.WithContext(ctx)); err != nil {
 		t.Fatal("unable to verify")
 	}
 }