VOL-1967 move api-server to separate repository
Change-Id: I21b85be74205805be15f8a85e53a903d16785671
diff --git a/vendor/gopkg.in/jcmturner/gokrb5.v7/crypto/rfc8009/encryption.go b/vendor/gopkg.in/jcmturner/gokrb5.v7/crypto/rfc8009/encryption.go
new file mode 100644
index 0000000..86aae09
--- /dev/null
+++ b/vendor/gopkg.in/jcmturner/gokrb5.v7/crypto/rfc8009/encryption.go
@@ -0,0 +1,128 @@
+// Package rfc8009 provides encryption and checksum methods as specified in RFC 8009
+package rfc8009
+
+import (
+ "crypto/aes"
+ "crypto/hmac"
+ "crypto/rand"
+ "errors"
+ "fmt"
+
+ "gopkg.in/jcmturner/aescts.v1"
+ "gopkg.in/jcmturner/gokrb5.v7/crypto/common"
+ "gopkg.in/jcmturner/gokrb5.v7/crypto/etype"
+ "gopkg.in/jcmturner/gokrb5.v7/iana/etypeID"
+)
+
+// EncryptData encrypts the data provided using methods specific to the etype provided as defined in RFC 8009.
+func EncryptData(key, data []byte, e etype.EType) ([]byte, []byte, error) {
+ kl := e.GetKeyByteSize()
+ if e.GetETypeID() == etypeID.AES256_CTS_HMAC_SHA384_192 {
+ kl = 32
+ }
+ if len(key) != kl {
+ return []byte{}, []byte{}, fmt.Errorf("incorrect keysize: expected: %v actual: %v", e.GetKeyByteSize(), len(key))
+ }
+ ivz := make([]byte, aes.BlockSize)
+ return aescts.Encrypt(key, ivz, data)
+}
+
+// EncryptMessage encrypts the message provided using the methods specific to the etype provided as defined in RFC 8009.
+// The encrypted data is concatenated with its integrity hash to create an encrypted message.
+func EncryptMessage(key, message []byte, usage uint32, e etype.EType) ([]byte, []byte, error) {
+ kl := e.GetKeyByteSize()
+ if e.GetETypeID() == etypeID.AES256_CTS_HMAC_SHA384_192 {
+ kl = 32
+ }
+ if len(key) != kl {
+ return []byte{}, []byte{}, fmt.Errorf("incorrect keysize: expected: %v actual: %v", kl, len(key))
+ }
+ if len(key) != e.GetKeyByteSize() {
+ }
+ //confounder
+ c := make([]byte, e.GetConfounderByteSize())
+ _, err := rand.Read(c)
+ if err != nil {
+ return []byte{}, []byte{}, fmt.Errorf("could not generate random confounder: %v", err)
+ }
+ plainBytes := append(c, message...)
+
+ // Derive key for encryption from usage
+ var k []byte
+ if usage != 0 {
+ k, err = e.DeriveKey(key, common.GetUsageKe(usage))
+ if err != nil {
+ return []byte{}, []byte{}, fmt.Errorf("error deriving key for encryption: %v", err)
+ }
+ }
+
+ // Encrypt the data
+ iv, b, err := e.EncryptData(k, plainBytes)
+ if err != nil {
+ return iv, b, fmt.Errorf("error encrypting data: %v", err)
+ }
+
+ ivz := make([]byte, e.GetConfounderByteSize())
+ ih, err := GetIntegityHash(ivz, b, key, usage, e)
+ if err != nil {
+ return iv, b, fmt.Errorf("error encrypting data: %v", err)
+ }
+ b = append(b, ih...)
+ return iv, b, nil
+}
+
+// DecryptData decrypts the data provided using the methods specific to the etype provided as defined in RFC 8009.
+func DecryptData(key, data []byte, e etype.EType) ([]byte, error) {
+ kl := e.GetKeyByteSize()
+ if e.GetETypeID() == etypeID.AES256_CTS_HMAC_SHA384_192 {
+ kl = 32
+ }
+ if len(key) != kl {
+ return []byte{}, fmt.Errorf("incorrect keysize: expected: %v actual: %v", kl, len(key))
+ }
+ ivz := make([]byte, aes.BlockSize)
+ return aescts.Decrypt(key, ivz, data)
+}
+
+// DecryptMessage decrypts the message provided using the methods specific to the etype provided as defined in RFC 8009.
+// The integrity of the message is also verified.
+func DecryptMessage(key, ciphertext []byte, usage uint32, e etype.EType) ([]byte, error) {
+ //Derive the key
+ k, err := e.DeriveKey(key, common.GetUsageKe(usage))
+ if err != nil {
+ return nil, fmt.Errorf("error deriving key: %v", err)
+ }
+ // Strip off the checksum from the end
+ b, err := e.DecryptData(k, ciphertext[:len(ciphertext)-e.GetHMACBitLength()/8])
+ if err != nil {
+ return nil, err
+ }
+ //Verify checksum
+ if !e.VerifyIntegrity(key, ciphertext, b, usage) {
+ return nil, errors.New("integrity verification failed")
+ }
+ //Remove the confounder bytes
+ return b[e.GetConfounderByteSize():], nil
+}
+
+// GetIntegityHash returns a keyed integrity hash of the bytes provided as defined in RFC 8009
+func GetIntegityHash(iv, c, key []byte, usage uint32, e etype.EType) ([]byte, error) {
+ // Generate and append integrity hash
+ // The HMAC is calculated over the cipher state concatenated with the
+ // AES output, instead of being calculated over the confounder and
+ // plaintext. This allows the message receiver to verify the
+ // integrity of the message before decrypting the message.
+ // H = HMAC(Ki, IV | C)
+ ib := append(iv, c...)
+ return common.GetIntegrityHash(ib, key, usage, e)
+}
+
+// VerifyIntegrity verifies the integrity of cipertext bytes ct.
+func VerifyIntegrity(key, ct []byte, usage uint32, etype etype.EType) bool {
+ h := make([]byte, etype.GetHMACBitLength()/8)
+ copy(h, ct[len(ct)-etype.GetHMACBitLength()/8:])
+ ivz := make([]byte, etype.GetConfounderByteSize())
+ ib := append(ivz, ct[:len(ct)-(etype.GetHMACBitLength()/8)]...)
+ expectedMAC, _ := common.GetIntegrityHash(ib, key, usage, etype)
+ return hmac.Equal(h, expectedMAC)
+}