pgcryptocipherccl: add pgcode for pkcs unpad errors

Release note: None

pkg/ccl/pgcryptoccl/pgcryptocipherccl/padding.go

@@ -12,6 +12,8 @@ import (
 	"bytes"
 	"math"
 
+	"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgcode"
+	"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgerror"
 	"github.com/cockroachdb/errors"
 )
 
@@ -36,16 +38,18 @@ func pkcsPad(data []byte, blockSize int) ([]byte, error) {
 // pkcsUnpad removes the padding added by pkcsPad.
 func pkcsUnpad(data []byte) ([]byte, error) {
 	if len(data) == 0 {
-		return nil, errors.New("PKCS-padded data is empty")
+		return nil, pgerror.New(pgcode.InvalidParameterValue, "PKCS-padded data is empty")
 	}
 
 	paddingLen := data[len(data)-1]
 	if paddingLen == 0 || int(paddingLen) > len(data) {
-		return nil, errors.Newf("invalid final byte found in PKCS-padded data: %d", paddingLen)
+		return nil, pgerror.Newf(pgcode.InvalidParameterValue,
+			"invalid final byte found in PKCS-padded data: %d", paddingLen)
 	}
 	for i := 1; i < int(paddingLen); i++ {
 		if b := data[len(data)-i-1]; b != paddingLen {
-			return nil, errors.Newf("invalid byte found in PKCS-padded data: expected %d, but found %d", paddingLen, b)
+			return nil, pgerror.Newf(pgcode.InvalidParameterValue,
+				"invalid byte found in PKCS-padded data: expected %d, but found %d", paddingLen, b)
 		}
 	}