132 lines
4.7 KiB
Go
132 lines
4.7 KiB
Go
package crypto
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import (
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"crypto/aes"
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"crypto/hmac"
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"crypto/sha512"
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"hash"
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"github.com/jcmturner/gokrb5/v8/crypto/common"
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"github.com/jcmturner/gokrb5/v8/crypto/rfc8009"
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"github.com/jcmturner/gokrb5/v8/iana/chksumtype"
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"github.com/jcmturner/gokrb5/v8/iana/etypeID"
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)
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// RFC https://tools.ietf.org/html/rfc8009
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// Aes256CtsHmacSha384192 implements Kerberos encryption type aes256-cts-hmac-sha384-192
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type Aes256CtsHmacSha384192 struct {
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}
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// GetETypeID returns the EType ID number.
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func (e Aes256CtsHmacSha384192) GetETypeID() int32 {
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return etypeID.AES256_CTS_HMAC_SHA384_192
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}
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// GetHashID returns the checksum type ID number.
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func (e Aes256CtsHmacSha384192) GetHashID() int32 {
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return chksumtype.HMAC_SHA384_192_AES256
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}
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// GetKeyByteSize returns the number of bytes for key of this etype.
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func (e Aes256CtsHmacSha384192) GetKeyByteSize() int {
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return 192 / 8
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}
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// GetKeySeedBitLength returns the number of bits for the seed for key generation.
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func (e Aes256CtsHmacSha384192) GetKeySeedBitLength() int {
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return e.GetKeyByteSize() * 8
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}
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// GetHashFunc returns the hash function for this etype.
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func (e Aes256CtsHmacSha384192) GetHashFunc() func() hash.Hash {
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return sha512.New384
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}
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// GetMessageBlockByteSize returns the block size for the etype's messages.
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func (e Aes256CtsHmacSha384192) GetMessageBlockByteSize() int {
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return 1
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}
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// GetDefaultStringToKeyParams returns the default key derivation parameters in string form.
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func (e Aes256CtsHmacSha384192) GetDefaultStringToKeyParams() string {
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return "00008000"
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}
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// GetConfounderByteSize returns the byte count for confounder to be used during cryptographic operations.
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func (e Aes256CtsHmacSha384192) GetConfounderByteSize() int {
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return aes.BlockSize
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}
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// GetHMACBitLength returns the bit count size of the integrity hash.
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func (e Aes256CtsHmacSha384192) GetHMACBitLength() int {
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return 192
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}
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// GetCypherBlockBitLength returns the bit count size of the cypher block.
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func (e Aes256CtsHmacSha384192) GetCypherBlockBitLength() int {
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return aes.BlockSize * 8
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}
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// StringToKey returns a key derived from the string provided.
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func (e Aes256CtsHmacSha384192) StringToKey(secret string, salt string, s2kparams string) ([]byte, error) {
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saltp := rfc8009.GetSaltP(salt, "aes256-cts-hmac-sha384-192")
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return rfc8009.StringToKey(secret, saltp, s2kparams, e)
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}
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// RandomToKey returns a key from the bytes provided.
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func (e Aes256CtsHmacSha384192) RandomToKey(b []byte) []byte {
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return rfc8009.RandomToKey(b)
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}
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// EncryptData encrypts the data provided.
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func (e Aes256CtsHmacSha384192) EncryptData(key, data []byte) ([]byte, []byte, error) {
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return rfc8009.EncryptData(key, data, e)
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}
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// EncryptMessage encrypts the message provided and concatenates it with the integrity hash to create an encrypted message.
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func (e Aes256CtsHmacSha384192) EncryptMessage(key, message []byte, usage uint32) ([]byte, []byte, error) {
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return rfc8009.EncryptMessage(key, message, usage, e)
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}
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// DecryptData decrypts the data provided.
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func (e Aes256CtsHmacSha384192) DecryptData(key, data []byte) ([]byte, error) {
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return rfc8009.DecryptData(key, data, e)
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}
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// DecryptMessage decrypts the message provided and verifies the integrity of the message.
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func (e Aes256CtsHmacSha384192) DecryptMessage(key, ciphertext []byte, usage uint32) ([]byte, error) {
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return rfc8009.DecryptMessage(key, ciphertext, usage, e)
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}
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// DeriveKey derives a key from the protocol key based on the usage value.
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func (e Aes256CtsHmacSha384192) DeriveKey(protocolKey, usage []byte) ([]byte, error) {
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return rfc8009.DeriveKey(protocolKey, usage, e), nil
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}
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// DeriveRandom generates data needed for key generation.
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func (e Aes256CtsHmacSha384192) DeriveRandom(protocolKey, usage []byte) ([]byte, error) {
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return rfc8009.DeriveRandom(protocolKey, usage, e)
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}
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// VerifyIntegrity checks the integrity of the ciphertext message.
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// As the hash is calculated over the iv concatenated with the AES cipher output not the plaintext the pt value to this
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// interface method is not use. Pass any []byte.
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func (e Aes256CtsHmacSha384192) VerifyIntegrity(protocolKey, ct, pt []byte, usage uint32) bool {
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// We don't need ib just there for the interface
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return rfc8009.VerifyIntegrity(protocolKey, ct, usage, e)
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}
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// GetChecksumHash returns a keyed checksum hash of the bytes provided.
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func (e Aes256CtsHmacSha384192) GetChecksumHash(protocolKey, data []byte, usage uint32) ([]byte, error) {
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return common.GetHash(data, protocolKey, common.GetUsageKc(usage), e)
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}
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// VerifyChecksum compares the checksum of the message bytes is the same as the checksum provided.
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func (e Aes256CtsHmacSha384192) VerifyChecksum(protocolKey, data, chksum []byte, usage uint32) bool {
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c, err := e.GetChecksumHash(protocolKey, data, usage)
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if err != nil {
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return false
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}
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return hmac.Equal(chksum, c)
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}
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