diff options
Diffstat (limited to 'vendor/github.com/rsc/letsencrypt/vendor/golang.org/x/crypto/ocsp/ocsp.go')
| -rw-r--r-- | vendor/github.com/rsc/letsencrypt/vendor/golang.org/x/crypto/ocsp/ocsp.go | 778 |
1 files changed, 0 insertions, 778 deletions
diff --git a/vendor/github.com/rsc/letsencrypt/vendor/golang.org/x/crypto/ocsp/ocsp.go b/vendor/github.com/rsc/letsencrypt/vendor/golang.org/x/crypto/ocsp/ocsp.go deleted file mode 100644 index 6bd347e28..000000000 --- a/vendor/github.com/rsc/letsencrypt/vendor/golang.org/x/crypto/ocsp/ocsp.go +++ /dev/null @@ -1,778 +0,0 @@ -// Copyright 2013 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// Package ocsp parses OCSP responses as specified in RFC 2560. OCSP responses -// are signed messages attesting to the validity of a certificate for a small -// period of time. This is used to manage revocation for X.509 certificates. -package ocsp // import "golang.org/x/crypto/ocsp" - -import ( - "crypto" - "crypto/ecdsa" - "crypto/elliptic" - "crypto/rand" - "crypto/rsa" - _ "crypto/sha1" - _ "crypto/sha256" - _ "crypto/sha512" - "crypto/x509" - "crypto/x509/pkix" - "encoding/asn1" - "errors" - "fmt" - "math/big" - "strconv" - "time" -) - -var idPKIXOCSPBasic = asn1.ObjectIdentifier([]int{1, 3, 6, 1, 5, 5, 7, 48, 1, 1}) - -// ResponseStatus contains the result of an OCSP request. See -// https://tools.ietf.org/html/rfc6960#section-2.3 -type ResponseStatus int - -const ( - Success ResponseStatus = 0 - Malformed ResponseStatus = 1 - InternalError ResponseStatus = 2 - TryLater ResponseStatus = 3 - // Status code four is unused in OCSP. See - // https://tools.ietf.org/html/rfc6960#section-4.2.1 - SignatureRequired ResponseStatus = 5 - Unauthorized ResponseStatus = 6 -) - -func (r ResponseStatus) String() string { - switch r { - case Success: - return "success" - case Malformed: - return "malformed" - case InternalError: - return "internal error" - case TryLater: - return "try later" - case SignatureRequired: - return "signature required" - case Unauthorized: - return "unauthorized" - default: - return "unknown OCSP status: " + strconv.Itoa(int(r)) - } -} - -// ResponseError is an error that may be returned by ParseResponse to indicate -// that the response itself is an error, not just that its indicating that a -// certificate is revoked, unknown, etc. -type ResponseError struct { - Status ResponseStatus -} - -func (r ResponseError) Error() string { - return "ocsp: error from server: " + r.Status.String() -} - -// These are internal structures that reflect the ASN.1 structure of an OCSP -// response. See RFC 2560, section 4.2. - -type certID struct { - HashAlgorithm pkix.AlgorithmIdentifier - NameHash []byte - IssuerKeyHash []byte - SerialNumber *big.Int -} - -// https://tools.ietf.org/html/rfc2560#section-4.1.1 -type ocspRequest struct { - TBSRequest tbsRequest -} - -type tbsRequest struct { - Version int `asn1:"explicit,tag:0,default:0,optional"` - RequestorName pkix.RDNSequence `asn1:"explicit,tag:1,optional"` - RequestList []request -} - -type request struct { - Cert certID -} - -type responseASN1 struct { - Status asn1.Enumerated - Response responseBytes `asn1:"explicit,tag:0,optional"` -} - -type responseBytes struct { - ResponseType asn1.ObjectIdentifier - Response []byte -} - -type basicResponse struct { - TBSResponseData responseData - SignatureAlgorithm pkix.AlgorithmIdentifier - Signature asn1.BitString - Certificates []asn1.RawValue `asn1:"explicit,tag:0,optional"` -} - -type responseData struct { - Raw asn1.RawContent - Version int `asn1:"optional,default:0,explicit,tag:0"` - RawResponderID asn1.RawValue - ProducedAt time.Time `asn1:"generalized"` - Responses []singleResponse -} - -type singleResponse struct { - CertID certID - Good asn1.Flag `asn1:"tag:0,optional"` - Revoked revokedInfo `asn1:"tag:1,optional"` - Unknown asn1.Flag `asn1:"tag:2,optional"` - ThisUpdate time.Time `asn1:"generalized"` - NextUpdate time.Time `asn1:"generalized,explicit,tag:0,optional"` - SingleExtensions []pkix.Extension `asn1:"explicit,tag:1,optional"` -} - -type revokedInfo struct { - RevocationTime time.Time `asn1:"generalized"` - Reason asn1.Enumerated `asn1:"explicit,tag:0,optional"` -} - -var ( - oidSignatureMD2WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 2} - oidSignatureMD5WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 4} - oidSignatureSHA1WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 5} - oidSignatureSHA256WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 11} - oidSignatureSHA384WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 12} - oidSignatureSHA512WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 13} - oidSignatureDSAWithSHA1 = asn1.ObjectIdentifier{1, 2, 840, 10040, 4, 3} - oidSignatureDSAWithSHA256 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 3, 2} - oidSignatureECDSAWithSHA1 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 1} - oidSignatureECDSAWithSHA256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 2} - oidSignatureECDSAWithSHA384 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 3} - oidSignatureECDSAWithSHA512 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 4} -) - -var hashOIDs = map[crypto.Hash]asn1.ObjectIdentifier{ - crypto.SHA1: asn1.ObjectIdentifier([]int{1, 3, 14, 3, 2, 26}), - crypto.SHA256: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 1}), - crypto.SHA384: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 2}), - crypto.SHA512: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 3}), -} - -// TODO(rlb): This is also from crypto/x509, so same comment as AGL's below -var signatureAlgorithmDetails = []struct { - algo x509.SignatureAlgorithm - oid asn1.ObjectIdentifier - pubKeyAlgo x509.PublicKeyAlgorithm - hash crypto.Hash -}{ - {x509.MD2WithRSA, oidSignatureMD2WithRSA, x509.RSA, crypto.Hash(0) /* no value for MD2 */}, - {x509.MD5WithRSA, oidSignatureMD5WithRSA, x509.RSA, crypto.MD5}, - {x509.SHA1WithRSA, oidSignatureSHA1WithRSA, x509.RSA, crypto.SHA1}, - {x509.SHA256WithRSA, oidSignatureSHA256WithRSA, x509.RSA, crypto.SHA256}, - {x509.SHA384WithRSA, oidSignatureSHA384WithRSA, x509.RSA, crypto.SHA384}, - {x509.SHA512WithRSA, oidSignatureSHA512WithRSA, x509.RSA, crypto.SHA512}, - {x509.DSAWithSHA1, oidSignatureDSAWithSHA1, x509.DSA, crypto.SHA1}, - {x509.DSAWithSHA256, oidSignatureDSAWithSHA256, x509.DSA, crypto.SHA256}, - {x509.ECDSAWithSHA1, oidSignatureECDSAWithSHA1, x509.ECDSA, crypto.SHA1}, - {x509.ECDSAWithSHA256, oidSignatureECDSAWithSHA256, x509.ECDSA, crypto.SHA256}, - {x509.ECDSAWithSHA384, oidSignatureECDSAWithSHA384, x509.ECDSA, crypto.SHA384}, - {x509.ECDSAWithSHA512, oidSignatureECDSAWithSHA512, x509.ECDSA, crypto.SHA512}, -} - -// TODO(rlb): This is also from crypto/x509, so same comment as AGL's below -func signingParamsForPublicKey(pub interface{}, requestedSigAlgo x509.SignatureAlgorithm) (hashFunc crypto.Hash, sigAlgo pkix.AlgorithmIdentifier, err error) { - var pubType x509.PublicKeyAlgorithm - - switch pub := pub.(type) { - case *rsa.PublicKey: - pubType = x509.RSA - hashFunc = crypto.SHA256 - sigAlgo.Algorithm = oidSignatureSHA256WithRSA - sigAlgo.Parameters = asn1.RawValue{ - Tag: 5, - } - - case *ecdsa.PublicKey: - pubType = x509.ECDSA - - switch pub.Curve { - case elliptic.P224(), elliptic.P256(): - hashFunc = crypto.SHA256 - sigAlgo.Algorithm = oidSignatureECDSAWithSHA256 - case elliptic.P384(): - hashFunc = crypto.SHA384 - sigAlgo.Algorithm = oidSignatureECDSAWithSHA384 - case elliptic.P521(): - hashFunc = crypto.SHA512 - sigAlgo.Algorithm = oidSignatureECDSAWithSHA512 - default: - err = errors.New("x509: unknown elliptic curve") - } - - default: - err = errors.New("x509: only RSA and ECDSA keys supported") - } - - if err != nil { - return - } - - if requestedSigAlgo == 0 { - return - } - - found := false - for _, details := range signatureAlgorithmDetails { - if details.algo == requestedSigAlgo { - if details.pubKeyAlgo != pubType { - err = errors.New("x509: requested SignatureAlgorithm does not match private key type") - return - } - sigAlgo.Algorithm, hashFunc = details.oid, details.hash - if hashFunc == 0 { - err = errors.New("x509: cannot sign with hash function requested") - return - } - found = true - break - } - } - - if !found { - err = errors.New("x509: unknown SignatureAlgorithm") - } - - return -} - -// TODO(agl): this is taken from crypto/x509 and so should probably be exported -// from crypto/x509 or crypto/x509/pkix. -func getSignatureAlgorithmFromOID(oid asn1.ObjectIdentifier) x509.SignatureAlgorithm { - for _, details := range signatureAlgorithmDetails { - if oid.Equal(details.oid) { - return details.algo - } - } - return x509.UnknownSignatureAlgorithm -} - -// TODO(rlb): This is not taken from crypto/x509, but it's of the same general form. -func getHashAlgorithmFromOID(target asn1.ObjectIdentifier) crypto.Hash { - for hash, oid := range hashOIDs { - if oid.Equal(target) { - return hash - } - } - return crypto.Hash(0) -} - -func getOIDFromHashAlgorithm(target crypto.Hash) asn1.ObjectIdentifier { - for hash, oid := range hashOIDs { - if hash == target { - return oid - } - } - return nil -} - -// This is the exposed reflection of the internal OCSP structures. - -// The status values that can be expressed in OCSP. See RFC 6960. -const ( - // Good means that the certificate is valid. - Good = iota - // Revoked means that the certificate has been deliberately revoked. - Revoked - // Unknown means that the OCSP responder doesn't know about the certificate. - Unknown - // ServerFailed is unused and was never used (see - // https://go-review.googlesource.com/#/c/18944). ParseResponse will - // return a ResponseError when an error response is parsed. - ServerFailed -) - -// The enumerated reasons for revoking a certificate. See RFC 5280. -const ( - Unspecified = iota - KeyCompromise = iota - CACompromise = iota - AffiliationChanged = iota - Superseded = iota - CessationOfOperation = iota - CertificateHold = iota - _ = iota - RemoveFromCRL = iota - PrivilegeWithdrawn = iota - AACompromise = iota -) - -// Request represents an OCSP request. See RFC 6960. -type Request struct { - HashAlgorithm crypto.Hash - IssuerNameHash []byte - IssuerKeyHash []byte - SerialNumber *big.Int -} - -// Marshal marshals the OCSP request to ASN.1 DER encoded form. -func (req *Request) Marshal() ([]byte, error) { - hashAlg := getOIDFromHashAlgorithm(req.HashAlgorithm) - if hashAlg == nil { - return nil, errors.New("Unknown hash algorithm") - } - return asn1.Marshal(ocspRequest{ - tbsRequest{ - Version: 0, - RequestList: []request{ - { - Cert: certID{ - pkix.AlgorithmIdentifier{ - Algorithm: hashAlg, - Parameters: asn1.RawValue{Tag: 5 /* ASN.1 NULL */}, - }, - req.IssuerNameHash, - req.IssuerKeyHash, - req.SerialNumber, - }, - }, - }, - }, - }) -} - -// Response represents an OCSP response containing a single SingleResponse. See -// RFC 6960. -type Response struct { - // Status is one of {Good, Revoked, Unknown} - Status int - SerialNumber *big.Int - ProducedAt, ThisUpdate, NextUpdate, RevokedAt time.Time - RevocationReason int - Certificate *x509.Certificate - // TBSResponseData contains the raw bytes of the signed response. If - // Certificate is nil then this can be used to verify Signature. - TBSResponseData []byte - Signature []byte - SignatureAlgorithm x509.SignatureAlgorithm - - // IssuerHash is the hash used to compute the IssuerNameHash and IssuerKeyHash. - // Valid values are crypto.SHA1, crypto.SHA256, crypto.SHA384, and crypto.SHA512. - // If zero, the default is crypto.SHA1. - IssuerHash crypto.Hash - - // RawResponderName optionally contains the DER-encoded subject of the - // responder certificate. Exactly one of RawResponderName and - // ResponderKeyHash is set. - RawResponderName []byte - // ResponderKeyHash optionally contains the SHA-1 hash of the - // responder's public key. Exactly one of RawResponderName and - // ResponderKeyHash is set. - ResponderKeyHash []byte - - // Extensions contains raw X.509 extensions from the singleExtensions field - // of the OCSP response. When parsing certificates, this can be used to - // extract non-critical extensions that are not parsed by this package. When - // marshaling OCSP responses, the Extensions field is ignored, see - // ExtraExtensions. - Extensions []pkix.Extension - - // ExtraExtensions contains extensions to be copied, raw, into any marshaled - // OCSP response (in the singleExtensions field). Values override any - // extensions that would otherwise be produced based on the other fields. The - // ExtraExtensions field is not populated when parsing certificates, see - // Extensions. - ExtraExtensions []pkix.Extension -} - -// These are pre-serialized error responses for the various non-success codes -// defined by OCSP. The Unauthorized code in particular can be used by an OCSP -// responder that supports only pre-signed responses as a response to requests -// for certificates with unknown status. See RFC 5019. -var ( - MalformedRequestErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x01} - InternalErrorErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x02} - TryLaterErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x03} - SigRequredErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x05} - UnauthorizedErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x06} -) - -// CheckSignatureFrom checks that the signature in resp is a valid signature -// from issuer. This should only be used if resp.Certificate is nil. Otherwise, -// the OCSP response contained an intermediate certificate that created the -// signature. That signature is checked by ParseResponse and only -// resp.Certificate remains to be validated. -func (resp *Response) CheckSignatureFrom(issuer *x509.Certificate) error { - return issuer.CheckSignature(resp.SignatureAlgorithm, resp.TBSResponseData, resp.Signature) -} - -// ParseError results from an invalid OCSP response. -type ParseError string - -func (p ParseError) Error() string { - return string(p) -} - -// ParseRequest parses an OCSP request in DER form. It only supports -// requests for a single certificate. Signed requests are not supported. -// If a request includes a signature, it will result in a ParseError. -func ParseRequest(bytes []byte) (*Request, error) { - var req ocspRequest - rest, err := asn1.Unmarshal(bytes, &req) - if err != nil { - return nil, err - } - if len(rest) > 0 { - return nil, ParseError("trailing data in OCSP request") - } - - if len(req.TBSRequest.RequestList) == 0 { - return nil, ParseError("OCSP request contains no request body") - } - innerRequest := req.TBSRequest.RequestList[0] - - hashFunc := getHashAlgorithmFromOID(innerRequest.Cert.HashAlgorithm.Algorithm) - if hashFunc == crypto.Hash(0) { - return nil, ParseError("OCSP request uses unknown hash function") - } - - return &Request{ - HashAlgorithm: hashFunc, - IssuerNameHash: innerRequest.Cert.NameHash, - IssuerKeyHash: innerRequest.Cert.IssuerKeyHash, - SerialNumber: innerRequest.Cert.SerialNumber, - }, nil -} - -// ParseResponse parses an OCSP response in DER form. It only supports -// responses for a single certificate. If the response contains a certificate -// then the signature over the response is checked. If issuer is not nil then -// it will be used to validate the signature or embedded certificate. -// -// Invalid responses and parse failures will result in a ParseError. -// Error responses will result in a ResponseError. -func ParseResponse(bytes []byte, issuer *x509.Certificate) (*Response, error) { - return ParseResponseForCert(bytes, nil, issuer) -} - -// ParseResponseForCert parses an OCSP response in DER form and searches for a -// Response relating to cert. If such a Response is found and the OCSP response -// contains a certificate then the signature over the response is checked. If -// issuer is not nil then it will be used to validate the signature or embedded -// certificate. -// -// Invalid responses and parse failures will result in a ParseError. -// Error responses will result in a ResponseError. -func ParseResponseForCert(bytes []byte, cert, issuer *x509.Certificate) (*Response, error) { - var resp responseASN1 - rest, err := asn1.Unmarshal(bytes, &resp) - if err != nil { - return nil, err - } - if len(rest) > 0 { - return nil, ParseError("trailing data in OCSP response") - } - - if status := ResponseStatus(resp.Status); status != Success { - return nil, ResponseError{status} - } - - if !resp.Response.ResponseType.Equal(idPKIXOCSPBasic) { - return nil, ParseError("bad OCSP response type") - } - - var basicResp basicResponse - rest, err = asn1.Unmarshal(resp.Response.Response, &basicResp) - if err != nil { - return nil, err - } - - if len(basicResp.Certificates) > 1 { - return nil, ParseError("OCSP response contains bad number of certificates") - } - - if n := len(basicResp.TBSResponseData.Responses); n == 0 || cert == nil && n > 1 { - return nil, ParseError("OCSP response contains bad number of responses") - } - - var singleResp singleResponse - if cert == nil { - singleResp = basicResp.TBSResponseData.Responses[0] - } else { - match := false - for _, resp := range basicResp.TBSResponseData.Responses { - if cert == nil || cert.SerialNumber.Cmp(resp.CertID.SerialNumber) == 0 { - singleResp = resp - match = true - break - } - } - if !match { - return nil, ParseError("no response matching the supplied certificate") - } - } - - ret := &Response{ - TBSResponseData: basicResp.TBSResponseData.Raw, - Signature: basicResp.Signature.RightAlign(), - SignatureAlgorithm: getSignatureAlgorithmFromOID(basicResp.SignatureAlgorithm.Algorithm), - Extensions: singleResp.SingleExtensions, - SerialNumber: singleResp.CertID.SerialNumber, - ProducedAt: basicResp.TBSResponseData.ProducedAt, - ThisUpdate: singleResp.ThisUpdate, - NextUpdate: singleResp.NextUpdate, - } - - // Handle the ResponderID CHOICE tag. ResponderID can be flattened into - // TBSResponseData once https://go-review.googlesource.com/34503 has been - // released. - rawResponderID := basicResp.TBSResponseData.RawResponderID - switch rawResponderID.Tag { - case 1: // Name - var rdn pkix.RDNSequence - if rest, err := asn1.Unmarshal(rawResponderID.Bytes, &rdn); err != nil || len(rest) != 0 { - return nil, ParseError("invalid responder name") - } - ret.RawResponderName = rawResponderID.Bytes - case 2: // KeyHash - if rest, err := asn1.Unmarshal(rawResponderID.Bytes, &ret.ResponderKeyHash); err != nil || len(rest) != 0 { - return nil, ParseError("invalid responder key hash") - } - default: - return nil, ParseError("invalid responder id tag") - } - - if len(basicResp.Certificates) > 0 { - ret.Certificate, err = x509.ParseCertificate(basicResp.Certificates[0].FullBytes) - if err != nil { - return nil, err - } - - if err := ret.CheckSignatureFrom(ret.Certificate); err != nil { - return nil, ParseError("bad signature on embedded certificate: " + err.Error()) - } - - if issuer != nil { - if err := issuer.CheckSignature(ret.Certificate.SignatureAlgorithm, ret.Certificate.RawTBSCertificate, ret.Certificate.Signature); err != nil { - return nil, ParseError("bad OCSP signature: " + err.Error()) - } - } - } else if issuer != nil { - if err := ret.CheckSignatureFrom(issuer); err != nil { - return nil, ParseError("bad OCSP signature: " + err.Error()) - } - } - - for _, ext := range singleResp.SingleExtensions { - if ext.Critical { - return nil, ParseError("unsupported critical extension") - } - } - - for h, oid := range hashOIDs { - if singleResp.CertID.HashAlgorithm.Algorithm.Equal(oid) { - ret.IssuerHash = h - break - } - } - if ret.IssuerHash == 0 { - return nil, ParseError("unsupported issuer hash algorithm") - } - - switch { - case bool(singleResp.Good): - ret.Status = Good - case bool(singleResp.Unknown): - ret.Status = Unknown - default: - ret.Status = Revoked - ret.RevokedAt = singleResp.Revoked.RevocationTime - ret.RevocationReason = int(singleResp.Revoked.Reason) - } - - return ret, nil -} - -// RequestOptions contains options for constructing OCSP requests. -type RequestOptions struct { - // Hash contains the hash function that should be used when - // constructing the OCSP request. If zero, SHA-1 will be used. - Hash crypto.Hash -} - -func (opts *RequestOptions) hash() crypto.Hash { - if opts == nil || opts.Hash == 0 { - // SHA-1 is nearly universally used in OCSP. - return crypto.SHA1 - } - return opts.Hash -} - -// CreateRequest returns a DER-encoded, OCSP request for the status of cert. If -// opts is nil then sensible defaults are used. -func CreateRequest(cert, issuer *x509.Certificate, opts *RequestOptions) ([]byte, error) { - hashFunc := opts.hash() - - // OCSP seems to be the only place where these raw hash identifiers are - // used. I took the following from - // http://msdn.microsoft.com/en-us/library/ff635603.aspx - _, ok := hashOIDs[hashFunc] - if !ok { - return nil, x509.ErrUnsupportedAlgorithm - } - - if !hashFunc.Available() { - return nil, x509.ErrUnsupportedAlgorithm - } - h := opts.hash().New() - - var publicKeyInfo struct { - Algorithm pkix.AlgorithmIdentifier - PublicKey asn1.BitString - } - if _, err := asn1.Unmarshal(issuer.RawSubjectPublicKeyInfo, &publicKeyInfo); err != nil { - return nil, err - } - - h.Write(publicKeyInfo.PublicKey.RightAlign()) - issuerKeyHash := h.Sum(nil) - - h.Reset() - h.Write(issuer.RawSubject) - issuerNameHash := h.Sum(nil) - - req := &Request{ - HashAlgorithm: hashFunc, - IssuerNameHash: issuerNameHash, - IssuerKeyHash: issuerKeyHash, - SerialNumber: cert.SerialNumber, - } - return req.Marshal() -} - -// CreateResponse returns a DER-encoded OCSP response with the specified contents. -// The fields in the response are populated as follows: -// -// The responder cert is used to populate the responder's name field, and the -// certificate itself is provided alongside the OCSP response signature. -// -// The issuer cert is used to puplate the IssuerNameHash and IssuerKeyHash fields. -// -// The template is used to populate the SerialNumber, RevocationStatus, RevokedAt, -// RevocationReason, ThisUpdate, and NextUpdate fields. -// -// If template.IssuerHash is not set, SHA1 will be used. -// -// The ProducedAt date is automatically set to the current date, to the nearest minute. -func CreateResponse(issuer, responderCert *x509.Certificate, template Response, priv crypto.Signer) ([]byte, error) { - var publicKeyInfo struct { - Algorithm pkix.AlgorithmIdentifier - PublicKey asn1.BitString - } - if _, err := asn1.Unmarshal(issuer.RawSubjectPublicKeyInfo, &publicKeyInfo); err != nil { - return nil, err - } - - if template.IssuerHash == 0 { - template.IssuerHash = crypto.SHA1 - } - hashOID := getOIDFromHashAlgorithm(template.IssuerHash) - if hashOID == nil { - return nil, errors.New("unsupported issuer hash algorithm") - } - - if !template.IssuerHash.Available() { - return nil, fmt.Errorf("issuer hash algorithm %v not linked into binary", template.IssuerHash) - } - h := template.IssuerHash.New() - h.Write(publicKeyInfo.PublicKey.RightAlign()) - issuerKeyHash := h.Sum(nil) - - h.Reset() - h.Write(issuer.RawSubject) - issuerNameHash := h.Sum(nil) - - innerResponse := singleResponse{ - CertID: certID{ - HashAlgorithm: pkix.AlgorithmIdentifier{ - Algorithm: hashOID, - Parameters: asn1.RawValue{Tag: 5 /* ASN.1 NULL */}, - }, - NameHash: issuerNameHash, - IssuerKeyHash: issuerKeyHash, - SerialNumber: template.SerialNumber, - }, - ThisUpdate: template.ThisUpdate.UTC(), - NextUpdate: template.NextUpdate.UTC(), - SingleExtensions: template.ExtraExtensions, - } - - switch template.Status { - case Good: - innerResponse.Good = true - case Unknown: - innerResponse.Unknown = true - case Revoked: - innerResponse.Revoked = revokedInfo{ - RevocationTime: template.RevokedAt.UTC(), - Reason: asn1.Enumerated(template.RevocationReason), - } - } - - rawResponderID := asn1.RawValue{ - Class: 2, // context-specific - Tag: 1, // Name (explicit tag) - IsCompound: true, - Bytes: responderCert.RawSubject, - } - tbsResponseData := responseData{ - Version: 0, - RawResponderID: rawResponderID, - ProducedAt: time.Now().Truncate(time.Minute).UTC(), - Responses: []singleResponse{innerResponse}, - } - - tbsResponseDataDER, err := asn1.Marshal(tbsResponseData) - if err != nil { - return nil, err - } - - hashFunc, signatureAlgorithm, err := signingParamsForPublicKey(priv.Public(), template.SignatureAlgorithm) - if err != nil { - return nil, err - } - - responseHash := hashFunc.New() - responseHash.Write(tbsResponseDataDER) - signature, err := priv.Sign(rand.Reader, responseHash.Sum(nil), hashFunc) - if err != nil { - return nil, err - } - - response := basicResponse{ - TBSResponseData: tbsResponseData, - SignatureAlgorithm: signatureAlgorithm, - Signature: asn1.BitString{ - Bytes: signature, - BitLength: 8 * len(signature), - }, - } - if template.Certificate != nil { - response.Certificates = []asn1.RawValue{ - asn1.RawValue{FullBytes: template.Certificate.Raw}, - } - } - responseDER, err := asn1.Marshal(response) - if err != nil { - return nil, err - } - - return asn1.Marshal(responseASN1{ - Status: asn1.Enumerated(Success), - Response: responseBytes{ - ResponseType: idPKIXOCSPBasic, - Response: responseDER, - }, - }) -} |