Plugins support (#46)

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2026-09-01 23:34:52 +00:00 · 2019-07-25 13:54:42 +08:00
parent daf4a0e0f5
commit c6b1f1db42
770 changed files with 213077 additions and 2659 deletions
@@ -0,0 +1,135 @@
+package crypto
+
+import (
+	"crypto/aes"
+	"crypto/hmac"
+	"crypto/sha512"
+	"hash"
+
+	"gopkg.in/jcmturner/gokrb5.v7/crypto/common"
+	"gopkg.in/jcmturner/gokrb5.v7/crypto/rfc8009"
+	"gopkg.in/jcmturner/gokrb5.v7/iana/chksumtype"
+	"gopkg.in/jcmturner/gokrb5.v7/iana/etypeID"
+)
+
+// RFC https://tools.ietf.org/html/rfc8009
+
+// Aes256CtsHmacSha384192 implements Kerberos encryption type aes256-cts-hmac-sha384-192
+type Aes256CtsHmacSha384192 struct {
+}
+
+// GetETypeID returns the EType ID number.
+func (e Aes256CtsHmacSha384192) GetETypeID() int32 {
+	return etypeID.AES256_CTS_HMAC_SHA384_192
+}
+
+// GetHashID returns the checksum type ID number.
+func (e Aes256CtsHmacSha384192) GetHashID() int32 {
+	return chksumtype.HMAC_SHA384_192_AES256
+}
+
+// GetKeyByteSize returns the number of bytes for key of this etype.
+func (e Aes256CtsHmacSha384192) GetKeyByteSize() int {
+	return 192 / 8
+}
+
+// GetKeySeedBitLength returns the number of bits for the seed for key generation.
+func (e Aes256CtsHmacSha384192) GetKeySeedBitLength() int {
+	return e.GetKeyByteSize() * 8
+}
+
+// GetHashFunc returns the hash function for this etype.
+func (e Aes256CtsHmacSha384192) GetHashFunc() func() hash.Hash {
+	return sha512.New384
+}
+
+// GetMessageBlockByteSize returns the block size for the etype's messages.
+func (e Aes256CtsHmacSha384192) GetMessageBlockByteSize() int {
+	return 1
+}
+
+// GetDefaultStringToKeyParams returns the default key derivation parameters in string form.
+func (e Aes256CtsHmacSha384192) GetDefaultStringToKeyParams() string {
+	return "00008000"
+}
+
+// GetConfounderByteSize returns the byte count for confounder to be used during cryptographic operations.
+func (e Aes256CtsHmacSha384192) GetConfounderByteSize() int {
+	return aes.BlockSize
+}
+
+// GetHMACBitLength returns the bit count size of the integrity hash.
+func (e Aes256CtsHmacSha384192) GetHMACBitLength() int {
+	return 192
+}
+
+// GetCypherBlockBitLength returns the bit count size of the cypher block.
+func (e Aes256CtsHmacSha384192) GetCypherBlockBitLength() int {
+	return aes.BlockSize * 8
+}
+
+// StringToKey returns a key derived from the string provided.
+func (e Aes256CtsHmacSha384192) StringToKey(secret string, salt string, s2kparams string) ([]byte, error) {
+	saltp := rfc8009.GetSaltP(salt, "aes256-cts-hmac-sha384-192")
+	return rfc8009.StringToKey(secret, saltp, s2kparams, e)
+}
+
+// RandomToKey returns a key from the bytes provided.
+func (e Aes256CtsHmacSha384192) RandomToKey(b []byte) []byte {
+	return rfc8009.RandomToKey(b)
+}
+
+// EncryptData encrypts the data provided.
+func (e Aes256CtsHmacSha384192) EncryptData(key, data []byte) ([]byte, []byte, error) {
+	return rfc8009.EncryptData(key, data, e)
+}
+
+// EncryptMessage encrypts the message provided and concatenates it with the integrity hash to create an encrypted message.
+func (e Aes256CtsHmacSha384192) EncryptMessage(key, message []byte, usage uint32) ([]byte, []byte, error) {
+	return rfc8009.EncryptMessage(key, message, usage, e)
+}
+
+// DecryptData decrypts the data provided.
+func (e Aes256CtsHmacSha384192) DecryptData(key, data []byte) ([]byte, error) {
+	return rfc8009.DecryptData(key, data, e)
+}
+
+// DecryptMessage decrypts the message provided and verifies the integrity of the message.
+func (e Aes256CtsHmacSha384192) DecryptMessage(key, ciphertext []byte, usage uint32) ([]byte, error) {
+	return rfc8009.DecryptMessage(key, ciphertext, usage, e)
+}
+
+// DeriveKey derives a key from the protocol key based on the usage value.
+func (e Aes256CtsHmacSha384192) DeriveKey(protocolKey, usage []byte) ([]byte, error) {
+	return rfc8009.DeriveKey(protocolKey, usage, e), nil
+}
+
+// DeriveRandom generates data needed for key generation.
+func (e Aes256CtsHmacSha384192) DeriveRandom(protocolKey, usage []byte) ([]byte, error) {
+	return rfc8009.DeriveRandom(protocolKey, usage, e)
+}
+
+// VerifyIntegrity checks the integrity of the ciphertext message.
+// 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.
+// Therefore the pt value to this interface method is not use. Pass any []byte.
+func (e Aes256CtsHmacSha384192) VerifyIntegrity(protocolKey, ct, pt []byte, usage uint32) bool {
+	// We don't need ib just there for the interface
+	return rfc8009.VerifyIntegrity(protocolKey, ct, usage, e)
+}
+
+// GetChecksumHash returns a keyed checksum hash of the bytes provided.
+func (e Aes256CtsHmacSha384192) GetChecksumHash(protocolKey, data []byte, usage uint32) ([]byte, error) {
+	return common.GetHash(data, protocolKey, common.GetUsageKc(usage), e)
+}
+
+// VerifyChecksum compares the checksum of the message bytes is the same as the checksum provided.
+func (e Aes256CtsHmacSha384192) VerifyChecksum(protocolKey, data, chksum []byte, usage uint32) bool {
+	c, err := e.GetChecksumHash(protocolKey, data, usage)
+	if err != nil {
+		return false
+	}
+	return hmac.Equal(chksum, c)
+}