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-rw-r--r--doc/man3/EVP_chacha20.pod12
1 files changed, 10 insertions, 2 deletions
diff --git a/doc/man3/EVP_chacha20.pod b/doc/man3/EVP_chacha20.pod
index 96da825cded4..a21b64859568 100644
--- a/doc/man3/EVP_chacha20.pod
+++ b/doc/man3/EVP_chacha20.pod
@@ -21,7 +21,15 @@ The ChaCha20 stream cipher for EVP.
=item EVP_chacha20()
-The ChaCha20 stream cipher. The key length is 256 bits, the IV is 96 bits long.
+The ChaCha20 stream cipher. The key length is 256 bits, the IV is 128 bits long.
+The first 32 bits consists of a counter in little-endian order followed by a 96
+bit nonce. For example a nonce of:
+
+000000000000000000000002
+
+With an initial counter of 42 (2a in hex) would be expressed as:
+
+2a000000000000000000000000000002
=item EVP_chacha20_poly1305()
@@ -46,7 +54,7 @@ L<EVP_CIPHER_meth_new(3)>
=head1 COPYRIGHT
-Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy