add support for xchacha20 and xchacha20-poly1305

xchacha is a chacha stream that allows for an extended nonce, which
in turn makes it feasible to use random nonces.

ok tb@

1 files changed, 17 insertions, 3 deletions

diff --git a/src/lib/libcrypto/man/EVP_AEAD_CTX_init.3 b/src/lib/libcrypto/man/EVP_AEAD_CTX_init.3
index debcc773c4..a4d759a2ed 100644
--- a/src/lib/libcrypto/man/EVP_AEAD_CTX_init.3
+++ b/src/lib/libcrypto/man/EVP_AEAD_CTX_init.3
@@ -1,4 +1,4 @@
-.\" $OpenBSD: EVP_AEAD_CTX_init.3,v 1.6 2017/08/28 17:43:43 jsing Exp $
+.\" $OpenBSD: EVP_AEAD_CTX_init.3,v 1.7 2019/01/22 00:59:21 dlg Exp $
 .\"
 .\" Copyright (c) 2014, Google Inc.
 .\" Parts of the text were written by Adam Langley and David Benjamin.
@@ -16,7 +16,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: August 28 2017 $
+.Dd $Mdocdate: January 22 2019 $
 .Dt EVP_AEAD_CTX_INIT 3
 .Os
 .Sh NAME
@@ -30,7 +30,8 @@
 .Nm EVP_AEAD_nonce_length ,
 .Nm EVP_aead_aes_128_gcm ,
 .Nm EVP_aead_aes_256_gcm ,
-.Nm EVP_aead_chacha20_poly1305
+.Nm EVP_aead_chacha20_poly1305,
+.Nm EVP_aead_xchacha20_poly1305
 .Nd authenticated encryption with additional data
 .Sh SYNOPSIS
 .In openssl/evp.h
@@ -101,6 +102,10 @@
 .Fo EVP_aead_chacha20_poly1305
 .Fa void
 .Fc
+.Ft const EVP_AEAD *
+.Fo EVP_aead_xchacha20_poly1305
+.Fa void
+.Fc
 .Sh DESCRIPTION
 AEAD (Authenticated Encryption with Additional Data) couples
 confidentiality and integrity in a single primitive.
@@ -219,6 +224,8 @@ AES-128 in Galois Counter Mode.
 AES-256 in Galois Counter Mode.
 .It Fn EVP_aead_chacha20_poly1305
 ChaCha20 with a Poly1305 authenticator.
+.It Fn EVP_aead_xchacha20_poly1305
+XChaCha20 with a Poly1305 authenticator.
 .El
 .Pp
 Where possible the
@@ -285,6 +292,13 @@ EVP_AEAD_CTX_cleanup(&ctx);
 .%R RFC 7539
 .%T ChaCha20 and Poly1305 for IETF Protocols
 .Re
+.Pp
+.Rs
+.%A S. Arciszewski
+.%D October 2018
+.%R draft-arciszewski-xchacha-02
+.%T XChaCha: eXtended-nonce ChaCha and AEAD_XChaCha20_Poly1305
+.Re
 .Sh HISTORY
 AEAD is based on the implementation by
 .An Adam Langley