CA: delete GenerateOCSP method (#8351)

Remove the CA.GenerateOCSP method, and all code related to signing OCSP
responses.

Fixes #8349

Author: aarongable

ca/ca.go

@@ -27,7 +27,6 @@ import (
 	"go.opentelemetry.io/otel/trace"
 	"golang.org/x/crypto/cryptobyte"
 	cryptobyte_asn1 "golang.org/x/crypto/cryptobyte/asn1"
-	"golang.org/x/crypto/ocsp"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
 	capb "github.com/letsencrypt/boulder/ca/proto"
@@ -259,12 +258,6 @@ func NewCertificateAuthorityImpl(
 	return ca, nil
 }
 
-var ocspStatusToCode = map[string]int{
-	"good":    ocsp.Good,
-	"revoked": ocsp.Revoked,
-	"unknown": ocsp.Unknown,
-}
-
 // issuePrecertificate is the first step in the [issuance cycle]. It allocates and stores a serial number,
 // selects a certificate profile, generates and stores a linting certificate, sets the serial's status to
 // "wait", signs and stores a precertificate, updates the serial's status to "good", then returns the

ca/ca_test.go

@@ -36,7 +36,6 @@ import (
 	"github.com/letsencrypt/boulder/identifier"
 	"github.com/letsencrypt/boulder/issuance"
 	blog "github.com/letsencrypt/boulder/log"
-	"github.com/letsencrypt/boulder/metrics"
 	"github.com/letsencrypt/boulder/must"
 	"github.com/letsencrypt/boulder/policy"
 	rapb "github.com/letsencrypt/boulder/ra/proto"
@@ -100,7 +99,6 @@ func mustRead(path string) []byte {
 
 type testCtx struct {
 	pa             core.PolicyAuthority
-	ocsp           *ocspImpl
 	crl            *crlImpl
 	certProfiles   map[string]*issuance.ProfileConfig
 	serialPrefix   byte
@@ -213,18 +211,6 @@ func setup(t *testing.T) *testCtx {
 		}, []string{"profile"})
 	cametrics := &caMetrics{signatureCount, signErrorCount, lintErrorCount, certificatesCount}
 
-	ocsp, err := NewOCSPImpl(
-		boulderIssuers,
-		24*time.Hour,
-		0,
-		time.Second,
-		blog.NewMock(),
-		metrics.NoopRegisterer,
-		cametrics,
-		fc,
-	)
-	test.AssertNotError(t, err, "Failed to create ocsp impl")
-
 	crl, err := NewCRLImpl(
 		boulderIssuers,
 		issuance.CRLProfileConfig{
@@ -239,7 +225,6 @@ func setup(t *testing.T) *testCtx {
 
 	return &testCtx{
 		pa:             pa,
-		ocsp:           ocsp,
 		crl:            crl,
 		certProfiles:   certProfiles,
 		serialPrefix:   0x11,