299 lines
9 KiB
Go
299 lines
9 KiB
Go
package certutil
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import (
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"bytes"
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"crypto"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha1"
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"crypto/x509"
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"encoding/json"
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"encoding/pem"
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"fmt"
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"math/big"
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"strconv"
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"strings"
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"github.com/mitchellh/mapstructure"
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)
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// GetOctalFormatted returns the byte buffer formatted in octal with
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// the specified separator between bytes.
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// FIXME: where did I originally copy this code from? This ain't octal, it's hex.
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func GetOctalFormatted(buf []byte, sep string) string {
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var ret bytes.Buffer
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for _, cur := range buf {
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if ret.Len() > 0 {
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fmt.Fprintf(&ret, sep)
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}
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fmt.Fprintf(&ret, "%02x", cur)
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}
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return ret.String()
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}
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func ParseHexFormatted(in, sep string) []byte {
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var ret bytes.Buffer
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var err error
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var inBits int64
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inBytes := strings.Split(in, sep)
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for _, inByte := range inBytes {
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if inBits, err = strconv.ParseInt(inByte, 16, 8); err != nil {
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return nil
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} else {
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ret.WriteByte(byte(inBits))
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}
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}
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return ret.Bytes()
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}
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// GetSubjKeyID returns the subject key ID, e.g. the SHA1 sum
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// of the marshaled public key
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func GetSubjKeyID(privateKey crypto.Signer) ([]byte, error) {
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if privateKey == nil {
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return nil, InternalError{"passed-in private key is nil"}
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}
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marshaledKey, err := x509.MarshalPKIXPublicKey(privateKey.Public())
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if err != nil {
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return nil, InternalError{fmt.Sprintf("error marshalling public key: %s", err)}
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}
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subjKeyID := sha1.Sum(marshaledKey)
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return subjKeyID[:], nil
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}
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// ParsePKIMap takes a map (for instance, the Secret.Data
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// returned from the PKI backend) and returns a ParsedCertBundle.
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func ParsePKIMap(data map[string]interface{}) (*ParsedCertBundle, error) {
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result := &CertBundle{}
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err := mapstructure.Decode(data, result)
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if err != nil {
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return nil, UserError{err.Error()}
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}
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return result.ToParsedCertBundle()
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}
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// ParsePKIJSON takes a JSON-encoded string and returns a ParsedCertBundle.
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//
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// This can be either the output of an
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// issue call from the PKI backend or just its data member; or,
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// JSON not coming from the PKI backend.
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func ParsePKIJSON(input []byte) (*ParsedCertBundle, error) {
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result := &CertBundle{}
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err := json.Unmarshal(input, &result)
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if err == nil {
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return result.ToParsedCertBundle()
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}
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var secret Secret
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err = json.Unmarshal(input, &secret)
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if err == nil {
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return ParsePKIMap(secret.Data)
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}
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return nil, UserError{"unable to parse out of either secret data or a secret object"}
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}
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// ParsePEMBundle takes a string of concatenated PEM-format certificate
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// and private key values and decodes/parses them, checking validity along
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// the way. There must be at max two certificates (a certificate and its
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// issuing certificate) and one private key.
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func ParsePEMBundle(pemBundle string) (*ParsedCertBundle, error) {
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if len(pemBundle) == 0 {
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return nil, UserError{"empty pem bundle"}
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}
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pemBytes := []byte(pemBundle)
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var pemBlock *pem.Block
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parsedBundle := &ParsedCertBundle{}
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for {
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pemBlock, pemBytes = pem.Decode(pemBytes)
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if pemBlock == nil {
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return nil, UserError{"no data found"}
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}
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if signer, err := x509.ParseECPrivateKey(pemBlock.Bytes); err == nil {
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if parsedBundle.PrivateKeyType != UnknownPrivateKey {
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return nil, UserError{"more than one private key given; provide only one private key in the bundle"}
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}
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parsedBundle.PrivateKeyType = ECPrivateKey
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parsedBundle.PrivateKeyBytes = pemBlock.Bytes
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parsedBundle.PrivateKey = signer
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} else if signer, err := x509.ParsePKCS1PrivateKey(pemBlock.Bytes); err == nil {
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if parsedBundle.PrivateKeyType != UnknownPrivateKey {
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return nil, UserError{"more than one private key given; provide only one private key in the bundle"}
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}
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parsedBundle.PrivateKeyType = RSAPrivateKey
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parsedBundle.PrivateKeyBytes = pemBlock.Bytes
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parsedBundle.PrivateKey = signer
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} else if signer, err := x509.ParsePKCS8PrivateKey(pemBlock.Bytes); err == nil {
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parsedBundle.PKCS8 = true
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if parsedBundle.PrivateKeyType != UnknownPrivateKey {
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return nil, UserError{"More than one private key given; provide only one private key in the bundle"}
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}
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switch signer := signer.(type) {
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case *rsa.PrivateKey:
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parsedBundle.PrivateKey = signer
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parsedBundle.PrivateKeyType = RSAPrivateKey
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parsedBundle.PrivateKeyBytes = pemBlock.Bytes
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case *ecdsa.PrivateKey:
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parsedBundle.PrivateKey = signer
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parsedBundle.PrivateKeyType = ECPrivateKey
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parsedBundle.PrivateKeyBytes = pemBlock.Bytes
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}
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} else if certificates, err := x509.ParseCertificates(pemBlock.Bytes); err == nil {
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switch len(certificates) {
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case 0:
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return nil, UserError{"pem block cannot be decoded to a private key or certificate"}
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case 1:
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if parsedBundle.Certificate != nil {
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switch {
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// We just found the issuing CA
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case bytes.Equal(parsedBundle.Certificate.AuthorityKeyId, certificates[0].SubjectKeyId) && certificates[0].IsCA:
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parsedBundle.IssuingCABytes = pemBlock.Bytes
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parsedBundle.IssuingCA = certificates[0]
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// Our saved certificate is actually the issuing CA
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case bytes.Equal(parsedBundle.Certificate.SubjectKeyId, certificates[0].AuthorityKeyId) && parsedBundle.Certificate.IsCA:
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parsedBundle.IssuingCA = parsedBundle.Certificate
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parsedBundle.IssuingCABytes = parsedBundle.CertificateBytes
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parsedBundle.CertificateBytes = pemBlock.Bytes
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parsedBundle.Certificate = certificates[0]
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}
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} else {
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switch {
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// If this case isn't correct, the caller needs to assign
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// the values to Certificate/CertificateBytes; assumptions
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// made here will not be valid for all cases.
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case certificates[0].IsCA:
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parsedBundle.IssuingCABytes = pemBlock.Bytes
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parsedBundle.IssuingCA = certificates[0]
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default:
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parsedBundle.CertificateBytes = pemBlock.Bytes
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parsedBundle.Certificate = certificates[0]
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}
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}
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default:
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return nil, UserError{"too many certificates given; provide a maximum of two certificates in the bundle"}
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}
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}
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if len(pemBytes) == 0 {
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break
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}
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}
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return parsedBundle, nil
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}
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// GeneratePrivateKey generates a private key with the specified type and key bits
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func GeneratePrivateKey(keyType string, keyBits int, container ParsedPrivateKeyContainer) error {
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var err error
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var privateKeyType int
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var privateKeyBytes []byte
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var privateKey crypto.Signer
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switch keyType {
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case "rsa":
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privateKeyType = RSAPrivateKey
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privateKey, err = rsa.GenerateKey(rand.Reader, keyBits)
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if err != nil {
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return InternalError{Err: fmt.Sprintf("error generating RSA private key: %v", err)}
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}
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privateKeyBytes = x509.MarshalPKCS1PrivateKey(privateKey.(*rsa.PrivateKey))
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case "ec":
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privateKeyType = ECPrivateKey
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var curve elliptic.Curve
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switch keyBits {
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case 224:
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curve = elliptic.P224()
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case 256:
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curve = elliptic.P256()
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case 384:
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curve = elliptic.P384()
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case 521:
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curve = elliptic.P521()
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default:
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return UserError{Err: fmt.Sprintf("unsupported bit length for EC key: %d", keyBits)}
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}
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privateKey, err = ecdsa.GenerateKey(curve, rand.Reader)
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if err != nil {
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return InternalError{Err: fmt.Sprintf("error generating EC private key: %v", err)}
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}
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privateKeyBytes, err = x509.MarshalECPrivateKey(privateKey.(*ecdsa.PrivateKey))
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if err != nil {
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return InternalError{Err: fmt.Sprintf("error marshalling EC private key: %v", err)}
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}
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default:
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return UserError{Err: fmt.Sprintf("unknown key type: %s", keyType)}
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}
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container.SetParsedPrivateKey(privateKey, privateKeyType, privateKeyBytes)
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return nil
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}
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// GenerateSerialNumber generates a serial number suitable for a certificate
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func GenerateSerialNumber() (*big.Int, error) {
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serial, err := rand.Int(rand.Reader, (&big.Int{}).Exp(big.NewInt(2), big.NewInt(159), nil))
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if err != nil {
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return nil, InternalError{Err: fmt.Sprintf("error generating serial number: %v", err)}
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}
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return serial, nil
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}
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// ComparePublicKeys compares two public keys and returns true if they match
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func ComparePublicKeys(key1Iface, key2Iface crypto.PublicKey) (bool, error) {
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switch key1Iface.(type) {
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case *rsa.PublicKey:
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key1 := key1Iface.(*rsa.PublicKey)
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key2, ok := key2Iface.(*rsa.PublicKey)
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if !ok {
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return false, fmt.Errorf("key types do not match: %T and %T", key1Iface, key2Iface)
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}
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if key1.N.Cmp(key2.N) != 0 ||
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key1.E != key2.E {
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return false, nil
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}
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return true, nil
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case *ecdsa.PublicKey:
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key1 := key1Iface.(*ecdsa.PublicKey)
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key2, ok := key2Iface.(*ecdsa.PublicKey)
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if !ok {
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return false, fmt.Errorf("key types do not match: %T and %T", key1Iface, key2Iface)
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}
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if key1.X.Cmp(key2.X) != 0 ||
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key1.Y.Cmp(key2.Y) != 0 {
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return false, nil
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}
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key1Params := key1.Params()
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key2Params := key2.Params()
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if key1Params.P.Cmp(key2Params.P) != 0 ||
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key1Params.N.Cmp(key2Params.N) != 0 ||
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key1Params.B.Cmp(key2Params.B) != 0 ||
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key1Params.Gx.Cmp(key2Params.Gx) != 0 ||
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key1Params.Gy.Cmp(key2Params.Gy) != 0 ||
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key1Params.BitSize != key2Params.BitSize {
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return false, nil
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}
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return true, nil
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default:
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return false, fmt.Errorf("cannot compare key with type %T", key1Iface)
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}
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return false, fmt.Errorf("undefined error comparing public keys")
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}
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