Document the change in EVP_chacha20(3).

Discussed with jsing

1 files changed, 5 insertions, 3 deletions

diff --git a/src/lib/libcrypto/man/EVP_EncryptInit.3 b/src/lib/libcrypto/man/EVP_EncryptInit.3
index 33fb6938fd..2cf9150597 100644
--- a/src/lib/libcrypto/man/EVP_EncryptInit.3
+++ b/src/lib/libcrypto/man/EVP_EncryptInit.3
@@ -1,4 +1,4 @@
-.\" $OpenBSD: EVP_EncryptInit.3,v 1.37 2020/01/22 22:56:07 tb Exp $
+.\" $OpenBSD: EVP_EncryptInit.3,v 1.38 2020/01/26 07:36:43 tb Exp $
 .\" full merge up to: OpenSSL 5211e094 Nov 11 14:39:11 2014 -0800
 .\"   EVP_bf_cbc.pod EVP_cast5_cbc.pod EVP_idea_cbc.pod EVP_rc2_cbc.pod
 .\"   7c6d372a Nov 20 13:20:01 2018 +0000
@@ -71,7 +71,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 .\" OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: January 22 2020 $
+.Dd $Mdocdate: January 26 2020 $
 .Dt EVP_ENCRYPTINIT 3
 .Os
 .Sh NAME
@@ -1029,7 +1029,9 @@ is an alias for
 implemented as a macro.
 .It Fn EVP_chacha20
 The ChaCha20 stream cipher.
-The key length is 256 bits, the IV is 64 bits long.
+The key length is 256 bits.
+The first 32 bit of the 128 bit IV are used as a counter,
+the remaining 96 bit as a nonce.
 .El
 .Pp
 See also