Update documentation for GCM and GMAC

2 files changed, 8 insertions, 3 deletions

diff --git a/NEWS b/NEWS
index 4ef6698..0016bfa 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,11 @@
 -*- mode: outline -*-
 
+* Changes since version 0.54
+
+** new features
+
+GCM and GMAC can use initialization vectors with a size different from 12 bytes.
+
 * Version 0.54, released 2021-01-06
 
 ** bug fixes
diff --git a/README.org b/README.org
index aa3a9c2..3d2e72e 100644
--- a/README.org
+++ b/README.org
@@ -718,8 +718,7 @@ notable exception of stream ciphers. /key/ must be an acceptable key for
 /cipher-name/.
 
 When making a GMAC, /cipher-name/ must have a [[block-length][block-length]] of 16. /key/ must be
-an acceptable key for /cipher-name/. The length of /initialization-vector/ must
-be 12 bytes.
+an acceptable key for /cipher-name/.
 
 When making a Poly1305 MAC, the length of the /key/ passed to [[make-mac][make-mac]] must be
 32 bytes.
@@ -857,7 +856,7 @@ When using ETM, /cipher/ must be a cipher object created by [[make-cipher][make-
 /mac/ must be a mac object created by [[make-mac][make-mac]].
 
 When using GCM, /cipher-name/ must have a [[block-length][block-length]] of 16 bytes. /key/ must be a suitable key
-for the chosen cipher. The length of /initialization-vector/ must be 12 bytes.
+for the chosen cipher.
 
 
 #+NAME: process-associated-data