From 0c09ad40403d870dd8aace5c6c428ca213ef93e5 Mon Sep 17 00:00:00 2001
From: tb <tb@openbsd.org>
Date: Tue, 11 May 2021 15:26:21 +0000
Subject: [PATCH] Merge documentation for EVP_DigestVerify() from OpenSSL
 1.1.1.

---
 lib/libcrypto/man/EVP_DigestVerifyInit.3 | 41 +++++++++++++++++++++---
 1 file changed, 37 insertions(+), 4 deletions(-)

diff --git a/lib/libcrypto/man/EVP_DigestVerifyInit.3 b/lib/libcrypto/man/EVP_DigestVerifyInit.3
index dc212cf1298..3ff7ef81e83 100644
--- a/lib/libcrypto/man/EVP_DigestVerifyInit.3
+++ b/lib/libcrypto/man/EVP_DigestVerifyInit.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: EVP_DigestVerifyInit.3,v 1.8 2019/06/10 14:58:48 schwarze Exp $
+.\"	$OpenBSD: EVP_DigestVerifyInit.3,v 1.9 2021/05/11 15:26:21 tb Exp $
 .\"	OpenSSL fb552ac6 Sep 30 23:43:01 2009 +0000
 .\"
 .\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
@@ -49,13 +49,14 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 .\" OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: June 10 2019 $
+.Dd $Mdocdate: May 11 2021 $
 .Dt EVP_DIGESTVERIFYINIT 3
 .Os
 .Sh NAME
 .Nm EVP_DigestVerifyInit ,
 .Nm EVP_DigestVerifyUpdate ,
-.Nm EVP_DigestVerifyFinal
+.Nm EVP_DigestVerifyFinal ,
+.Nm EVP_DigestVerify
 .Nd EVP signature verification functions
 .Sh SYNOPSIS
 .In openssl/evp.h
@@ -79,6 +80,14 @@
 .Fa "const unsigned char *sig"
 .Fa "size_t siglen"
 .Fc
+.Ft int
+.Fo EVP_DigestVerify
+.Fa "EVP_MD_CTX *ctx"
+.Fa "const unsigned char *sig"
+.Fa "size_t siglen"
+.Fa "const unsigned char *tbs"
+.Fa "size_t *tbslen"
+.Fc
 .Sh DESCRIPTION
 The EVP signature routines are a high level interface to digital
 signatures.
@@ -127,6 +136,26 @@ against the signature in
 of length
 .Fa siglen .
 .Pp
+.Fn EVP_DigestVerify
+verifies
+.Fa tbslen
+bytes at
+.Fa tbs
+against the signature in
+.Fa sig
+of length
+.Fa siglen
+.Fn EVP_DigestVerify
+is a one shot operation which verifies a single block of data
+in one function call.
+For algorithms that support streaming it is equivalent to calling
+.Fn EVP_DigestVerifyUpdate
+and
+.Fn EVP_DigestVerifyFinal .
+.\" For algorithms which do not support streaming
+.\" (e.g. PureEdDSA)
+.\" it is the only way to verify data.
+.Pp
 The EVP interface to digital signatures should almost always be
 used in preference to the low level interfaces.
 This is because the code then becomes transparent to the algorithm used
@@ -162,7 +191,8 @@ In particular a return value of -2 indicates the operation is not
 supported by the public key algorithm.
 .Pp
 .Fn EVP_DigestVerifyFinal
-returns 1 for success; any other value indicates failure.
+.Fn EVP_DigestVerify
+return 1 for success; any other value indicates failure.
 A return value of 0 indicates that the signature did not verify
 successfully (that is, the signature did not match the original
 data or the signature had an invalid form), while other values
@@ -183,3 +213,6 @@ and
 .Fn EVP_DigestVerifyFinal
 first appeared in OpenSSL 1.0.0 and have been available since
 .Ox 4.9 .
+.Fn EVP_DigestVerify
+first appeared in OpenSSL 1.1.1 and has been available since
+.Ox 7.0 .
-- 
2.20.1