139 lines
4.5 KiB
Go
139 lines
4.5 KiB
Go
package crypto
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import (
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"crypto/des"
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"crypto/hmac"
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"crypto/sha1"
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"errors"
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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/rfc3961"
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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: 3961 Section 6.3
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// Des3CbcSha1Kd implements Kerberos encryption type des3-cbc-hmac-sha1-kd
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type Des3CbcSha1Kd struct {
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}
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// GetETypeID returns the EType ID number.
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func (e Des3CbcSha1Kd) GetETypeID() int32 {
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return etypeID.DES3_CBC_SHA1_KD
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}
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// GetHashID returns the checksum type ID number.
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func (e Des3CbcSha1Kd) GetHashID() int32 {
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return chksumtype.HMAC_SHA1_DES3_KD
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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 Des3CbcSha1Kd) GetKeyByteSize() int {
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return 24
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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 Des3CbcSha1Kd) GetKeySeedBitLength() int {
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return 21 * 8
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}
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// GetHashFunc returns the hash function for this etype.
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func (e Des3CbcSha1Kd) GetHashFunc() func() hash.Hash {
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return sha1.New
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}
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// GetMessageBlockByteSize returns the block size for the etype's messages.
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func (e Des3CbcSha1Kd) GetMessageBlockByteSize() int {
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//For traditional CBC mode with padding, it would be the underlying cipher's block size
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return des.BlockSize
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}
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// GetDefaultStringToKeyParams returns the default key derivation parameters in string form.
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func (e Des3CbcSha1Kd) GetDefaultStringToKeyParams() string {
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var s string
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return s
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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 Des3CbcSha1Kd) GetConfounderByteSize() int {
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return des.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 Des3CbcSha1Kd) GetHMACBitLength() int {
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return e.GetHashFunc()().Size() * 8
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}
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// GetCypherBlockBitLength returns the bit count size of the cypher block.
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func (e Des3CbcSha1Kd) GetCypherBlockBitLength() int {
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return des.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 Des3CbcSha1Kd) StringToKey(secret string, salt string, s2kparams string) ([]byte, error) {
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if s2kparams != "" {
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return []byte{}, errors.New("s2kparams must be an empty string")
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}
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return rfc3961.DES3StringToKey(secret, salt, e)
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}
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// RandomToKey returns a key from the bytes provided.
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func (e Des3CbcSha1Kd) RandomToKey(b []byte) []byte {
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return rfc3961.DES3RandomToKey(b)
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}
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// DeriveRandom generates data needed for key generation.
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func (e Des3CbcSha1Kd) DeriveRandom(protocolKey, usage []byte) ([]byte, error) {
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r, err := rfc3961.DeriveRandom(protocolKey, usage, e)
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return r, err
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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 Des3CbcSha1Kd) DeriveKey(protocolKey, usage []byte) ([]byte, error) {
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r, err := e.DeriveRandom(protocolKey, usage)
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if err != nil {
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return nil, err
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}
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return e.RandomToKey(r), nil
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}
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// EncryptData encrypts the data provided.
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func (e Des3CbcSha1Kd) EncryptData(key, data []byte) ([]byte, []byte, error) {
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return rfc3961.DES3EncryptData(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 Des3CbcSha1Kd) EncryptMessage(key, message []byte, usage uint32) ([]byte, []byte, error) {
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return rfc3961.DES3EncryptMessage(key, message, usage, e)
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}
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// DecryptData decrypts the data provided.
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func (e Des3CbcSha1Kd) DecryptData(key, data []byte) ([]byte, error) {
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return rfc3961.DES3DecryptData(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 Des3CbcSha1Kd) DecryptMessage(key, ciphertext []byte, usage uint32) ([]byte, error) {
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return rfc3961.DES3DecryptMessage(key, ciphertext, usage, e)
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}
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// VerifyIntegrity checks the integrity of the plaintext message.
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func (e Des3CbcSha1Kd) VerifyIntegrity(protocolKey, ct, pt []byte, usage uint32) bool {
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return rfc3961.VerifyIntegrity(protocolKey, ct, pt, 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 Des3CbcSha1Kd) 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 Des3CbcSha1Kd) 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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