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diff --git a/src/conditions.lisp b/src/conditions.lisp
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+;; This file is part of eris-cl.
+;; Copyright (C) 2022 Piotr Szarmański
+
+;; eris-cl is free software: you can redistribute it and/or modify it under the
+;; terms of the GNU Lesser General Public License as published by the Free
+;; Software Foundation, either version 3 of the License, or (at your option) any
+;; later versqion.
+
+;; eris-cl is distributed in the hope that it will be useful, but WITHOUT ANY
+;; WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+;; A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License along with
+;; eris-cl. If not, see <https://www.gnu.org/licenses/>.
+
+(in-package :eris)
+
+(define-constant +eris-revision+ "0.3" :test #'equalp)
+
+(define-condition eris-condition () ())
+
+(define-condition missing-block (eris-condition error)
+  ((reference :initarg :reference :reader reference))
+  (:report (lambda (condition stream)
+             (format stream "Missing block: ~a" (reference condition)))))
+
+(define-condition padding-error (eris-condition error)
+  ()
+  (:report "Corrupted padding."))
+
+(define-condition version-mismatch (eris-condition error)
+  ()
+  (:report (lambda (condition stream)
+             (declare (ignore condition))
+             (format stream "Provided object has been encoded with a different version of the ERIS standard than ~a." +eris-revision+))))
+
+(define-condition eof (eris-condition error)
+  ((eof :initarg :eof :reader eof)
+   (pos :initarg :position :reader pos))
+  (:report (lambda (condition stream)
+             (with-slots (eof pos) condition
+               (format stream "End of file (~d) reached at ~d." eof pos)))))
+
+(define-condition hash-mismatch (eris-condition error)
+  ((reference :initarg :reference :reader reference)
+   (hash :initarg :hash :reader hash))
+  (:report (lambda (condition stream)
+             (format stream "The hash ~a does not match the reference ~a." (hash condition) (reference condition)))))
+
+(define-condition invalid-internal-block (eris-condition error)
+  ((reference :initarg :reference :reader reference))
+  (:report (lambda (condition stream)
+             (format stream "The internal block ~a is invalid." (reference condition)))))