Update module lib/pq to v1.6.0 (#572)

Update module lib/pq to v1.6.0

Reviewed-on: https://kolaente.dev/vikunja/api/pulls/572

vendor/github.com/jcmturner/gokrb5/v8/crypto/rfc3962/encryption.go

@@ -0,0 +1,89 @@
+// Package rfc3962 provides encryption and checksum methods as specified in RFC 3962
+package rfc3962
+
+import (
+	"crypto/rand"
+	"errors"
+	"fmt"
+
+	"github.com/jcmturner/aescts/v2"
+	"github.com/jcmturner/gokrb5/v8/crypto/common"
+	"github.com/jcmturner/gokrb5/v8/crypto/etype"
+)
+
+// EncryptData encrypts the data provided using methods specific to the etype provided as defined in RFC 3962.
+func EncryptData(key, data []byte, e etype.EType) ([]byte, []byte, error) {
+	if len(key) != e.GetKeyByteSize() {
+		return []byte{}, []byte{}, fmt.Errorf("incorrect keysize: expected: %v actual: %v", e.GetKeyByteSize(), len(key))
+	}
+	ivz := make([]byte, e.GetCypherBlockBitLength()/8)
+	return aescts.Encrypt(key, ivz, data)
+}
+
+// EncryptMessage encrypts the message provided using the methods specific to the etype provided as defined in RFC 3962.
+// 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) {
+	if len(key) != e.GetKeyByteSize() {
+		return []byte{}, []byte{}, fmt.Errorf("incorrect keysize: expected: %v actual: %v", e.GetKeyByteSize(), len(key))
+	}
+	//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)
+	}
+
+	// Generate and append integrity hash
+	ih, err := common.GetIntegrityHash(plainBytes, 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 3962.
+func DecryptData(key, data []byte, e etype.EType) ([]byte, error) {
+	if len(key) != e.GetKeyByteSize() {
+		return []byte{}, fmt.Errorf("incorrect keysize: expected: %v actual: %v", e.GetKeyByteSize(), len(key))
+	}
+	ivz := make([]byte, e.GetCypherBlockBitLength()/8)
+	return aescts.Decrypt(key, ivz, data)
+}
+
+// DecryptMessage decrypts the message provided using the methods specific to the etype provided as defined in RFC 3962.
+// 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
+}

vendor/github.com/jcmturner/gokrb5/v8/crypto/rfc3962/keyDerivation.go

@@ -0,0 +1,51 @@
+package rfc3962
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+	"errors"
+
+	"github.com/jcmturner/gofork/x/crypto/pbkdf2"
+	"github.com/jcmturner/gokrb5/v8/crypto/etype"
+)
+
+const (
+	s2kParamsZero = 4294967296
+)
+
+// StringToKey returns a key derived from the string provided according to the definition in RFC 3961.
+func StringToKey(secret, salt, s2kparams string, e etype.EType) ([]byte, error) {
+	i, err := S2KparamsToItertions(s2kparams)
+	if err != nil {
+		return nil, err
+	}
+	return StringToKeyIter(secret, salt, i, e)
+}
+
+// StringToPBKDF2 generates an encryption key from a pass phrase and salt string using the PBKDF2 function from PKCS #5 v2.0
+func StringToPBKDF2(secret, salt string, iterations int64, e etype.EType) []byte {
+	return pbkdf2.Key64([]byte(secret), []byte(salt), iterations, int64(e.GetKeyByteSize()), e.GetHashFunc())
+}
+
+// StringToKeyIter returns a key derived from the string provided according to the definition in RFC 3961.
+func StringToKeyIter(secret, salt string, iterations int64, e etype.EType) ([]byte, error) {
+	tkey := e.RandomToKey(StringToPBKDF2(secret, salt, iterations, e))
+	return e.DeriveKey(tkey, []byte("kerberos"))
+}
+
+// S2KparamsToItertions converts the string representation of iterations to an integer
+func S2KparamsToItertions(s2kparams string) (int64, error) {
+	//The s2kparams string should be hex string representing 4 bytes
+	//The 4 bytes represent a number in big endian order
+	//If the value is zero then the number of iterations should be 4,294,967,296 (2^32)
+	var i uint32
+	if len(s2kparams) != 8 {
+		return int64(s2kParamsZero), errors.New("invalid s2kparams length")
+	}
+	b, err := hex.DecodeString(s2kparams)
+	if err != nil {
+		return int64(s2kParamsZero), errors.New("invalid s2kparams, cannot decode string to bytes")
+	}
+	i = binary.BigEndian.Uint32(b)
+	return int64(i), nil
+}