From e5fd32babdc118dd837a92f74a6474fcc1ddfcd3 Mon Sep 17 00:00:00 2001
From: deraadt <>
Date: Fri, 30 Aug 2019 22:20:43 +0000
Subject: [PATCH] name these manual pages by the primary function, for instance
 there is no function called md5() as discussed with jmc

---
 src/lib/libc/hash/{md5.3 => MD5Init.3}        |  15 +-
 src/lib/libc/hash/Makefile.inc                |   4 +-
 src/lib/libc/hash/{rmd160.3 => RMD160Init.3}  |  14 +-
 src/lib/libc/hash/{sha1.3 => SHA1Init.3}      |  10 +-
 src/lib/libc/hash/SHA256Init.3                |  46 +++
 .../hash/{SipHash24.3 => SipHash24_Init.3}    |   4 +-
 src/lib/libc/hash/sha2.3                      | 350 ------------------
 7 files changed, 69 insertions(+), 374 deletions(-)
 rename src/lib/libc/hash/{md5.3 => MD5Init.3} (96%)
 rename src/lib/libc/hash/{rmd160.3 => RMD160Init.3} (97%)
 rename src/lib/libc/hash/{sha1.3 => SHA1Init.3} (97%)
 create mode 100644 src/lib/libc/hash/SHA256Init.3
 rename src/lib/libc/hash/{SipHash24.3 => SipHash24_Init.3} (96%)
 delete mode 100644 src/lib/libc/hash/sha2.3

diff --git a/src/lib/libc/hash/md5.3 b/src/lib/libc/hash/MD5Init.3
similarity index 96%
rename from src/lib/libc/hash/md5.3
rename to src/lib/libc/hash/MD5Init.3
index 2cf8d5f9..4541ce2b 100644
--- a/src/lib/libc/hash/md5.3
+++ b/src/lib/libc/hash/MD5Init.3
@@ -16,9 +16,9 @@
 .\" If we meet some day, and you think this stuff is worth it, you
 .\" can buy me a beer in return. Poul-Henning Kamp
 .\"
-.\" 	$OpenBSD: md5.3,v 1.7 2017/06/13 19:41:55 deraadt Exp $
+.\" 	$OpenBSD: MD5Init.3,v 1.1 2019/08/30 22:20:43 deraadt Exp $
 .\"
-.Dd $Mdocdate: June 13 2017 $
+.Dd $Mdocdate: August 30 2019 $
 .Dt MD5INIT 3
 .Os
 .Sh NAME
@@ -162,9 +162,9 @@ characters of buffer space.
 .Sh SEE ALSO
 .Xr cksum 1 ,
 .Xr md5 1 ,
-.Xr rmd160 3 ,
-.Xr sha1 3 ,
-.Xr sha2 3
+.Xr RMD160Init 3 ,
+.Xr SHA1INIT 3 ,
+.Xr SHA256INIT 3
 .Rs
 .%A H. Dobbertin
 .%D 1995
@@ -210,6 +210,5 @@ helper functions are derived from code written by
 .An Poul-Henning Kamp .
 .Sh BUGS
 Collisions have been found for the full version of MD5.
-The use of
-.Xr sha2 3
-is recommended instead.
+The use of the SHA2 functions is recommended instead.
+
diff --git a/src/lib/libc/hash/Makefile.inc b/src/lib/libc/hash/Makefile.inc
index 2baaf390..4619bbd5 100644
--- a/src/lib/libc/hash/Makefile.inc
+++ b/src/lib/libc/hash/Makefile.inc
@@ -1,11 +1,11 @@
-#	$OpenBSD: Makefile.inc,v 1.24 2016/09/03 16:25:03 tedu Exp $
+#	$OpenBSD: Makefile.inc,v 1.25 2019/08/30 22:20:43 deraadt Exp $
 
 # hash functions
 .PATH: ${LIBCSRCDIR}/hash
 
 HELPER=	md5hl.c rmd160hl.c sha1hl.c sha224hl.c sha256hl.c sha384hl.c sha512hl.c sha512_256hl.c
 SRCS+=	md5.c rmd160.c sha1.c sha2.c ${HELPER} siphash.c
-MAN+=	md5.3 rmd160.3 sha1.3 sha2.3 SipHash24.3
+MAN+=	MD5Init.3 RMD160Init.3 SHA1Init.3 SHA256Init.3 SipHash24_Init.3
 
 CLEANFILES+= ${HELPER}
 
diff --git a/src/lib/libc/hash/rmd160.3 b/src/lib/libc/hash/RMD160Init.3
similarity index 97%
rename from src/lib/libc/hash/rmd160.3
rename to src/lib/libc/hash/RMD160Init.3
index 2ed78d2e..b8327bc2 100644
--- a/src/lib/libc/hash/rmd160.3
+++ b/src/lib/libc/hash/RMD160Init.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: rmd160.3,v 1.39 2019/01/25 00:19:25 millert Exp $
+.\"	$OpenBSD: RMD160Init.3,v 1.1 2019/08/30 22:20:43 deraadt Exp $
 .\"
 .\" Copyright (c) 1997, 2004 Todd C. Miller <millert@openbsd.org>
 .\"
@@ -17,7 +17,7 @@
 .\" See http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html
 .\"	for detailed information about RIPEMD-160.
 .\"
-.Dd $Mdocdate: January 25 2019 $
+.Dd $Mdocdate: August 30 2019 $
 .Dt RMD160INIT 3
 .Os
 .Sh NAME
@@ -62,9 +62,9 @@ message less than 2^64 bits as input and produces a 160-bit digest
 suitable for use as a digital signature.
 .Pp
 The RMD160 functions are considered to be more secure than the
-.Xr md5 3
+MD5
 functions and at least as secure as the
-.Xr sha1 3
+SHA1
 function.
 All share a similar interface.
 .Pp
@@ -199,9 +199,9 @@ printf("0x%s\en", RMD160Data(buf, strlen(buf), output));
 .Ed
 .Sh SEE ALSO
 .Xr cksum 1 ,
-.Xr md5 3 ,
-.Xr sha1 3 ,
-.Xr sha2 3
+.Xr MD5Init 3 ,
+.Xr SHA1INIT 3 ,
+.Xr SHA256INIT 3
 .Rs
 .%A H. Dobbertin, A. Bosselaers, B. Preneel
 .%T RIPEMD-160, a strengthened version of RIPEMD
diff --git a/src/lib/libc/hash/sha1.3 b/src/lib/libc/hash/SHA1Init.3
similarity index 97%
rename from src/lib/libc/hash/sha1.3
rename to src/lib/libc/hash/SHA1Init.3
index a4204ccf..b577e029 100644
--- a/src/lib/libc/hash/sha1.3
+++ b/src/lib/libc/hash/SHA1Init.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: sha1.3,v 1.46 2019/01/25 00:19:25 millert Exp $
+.\"	$OpenBSD: SHA1Init.3,v 1.1 2019/08/30 22:20:43 deraadt Exp $
 .\"
 .\" Copyright (c) 1997, 2004 Todd C. Miller <millert@openbsd.org>
 .\"
@@ -17,7 +17,7 @@
 .\" See http://csrc.nist.gov/publications/fips/fips180-1/fip180-1.txt
 .\" for the detailed standard
 .\"
-.Dd $Mdocdate: January 25 2019 $
+.Dd $Mdocdate: August 30 2019 $
 .Dt SHA1INIT 3
 .Os
 .Sh NAME
@@ -205,9 +205,9 @@ printf("0x%s\en", SHA1Data(buf, strlen(buf), output));
 .Sh SEE ALSO
 .Xr cksum 1 ,
 .Xr sha1 1 ,
-.Xr md5 3 ,
-.Xr rmd160 3 ,
-.Xr sha2 3
+.Xr MD5Init 3 ,
+.Xr RMD160Init 3 ,
+.Xr SHA256INIT 3
 .Sh STANDARDS
 .Rs
 .%A J. Burrows
diff --git a/src/lib/libc/hash/SHA256Init.3 b/src/lib/libc/hash/SHA256Init.3
new file mode 100644
index 00000000..ef95d23b
--- /dev/null
+++ b/src/lib/libc/hash/SHA256Init.3
@@ -0,0 +1,46 @@
+#	$OpenBSD: SHA256Init.3,v 1.1 2019/08/30 22:20:43 deraadt Exp $
+
+# hash functions
+.PATH: ${LIBCSRCDIR}/hash
+
+HELPER=	md5hl.c rmd160hl.c sha1hl.c sha224hl.c sha256hl.c sha384hl.c sha512hl.c sha512_256hl.c
+SRCS+=	md5.c rmd160.c sha1.c sha2.c ${HELPER} siphash.c
+MAN+=	MD5Init.3 RMD160Init.3 SHA1Init.3 SHA256Init.3 SipHash24_Init.3
+
+CLEANFILES+= ${HELPER}
+
+md5hl.c:	helper.c
+	sed -e 's/hashinc/md5.h/g' -e 's/HASH/MD5/g' $> > $@
+
+rmd160hl.c:	helper.c
+	sed -e 's/hashinc/rmd160.h/g' -e 's/HASH/RMD160/g' $> > $@
+
+sha1hl.c:	helper.c
+	sed -e 's/hashinc/sha1.h/g' -e 's/HASH/SHA1/g' $> > $@
+
+sha224hl.c:	helper.c
+	sed -e 's/hashinc/sha2.h/g' \
+	    -e 's/HASH/SHA224/g' \
+	    -e 's/SHA[0-9][0-9][0-9]_CTX/SHA2_CTX/g' $> > $@
+
+sha256hl.c:	helper.c
+	sed -e 's/hashinc/sha2.h/g' \
+	    -e 's/HASH/SHA256/g' \
+	    -e 's/SHA[0-9][0-9][0-9]_CTX/SHA2_CTX/g' $> > $@
+
+sha384hl.c:	helper.c
+	sed -e 's/hashinc/sha2.h/g' \
+	    -e 's/HASH/SHA384/g' \
+	    -e 's/SHA[0-9][0-9][0-9]_CTX/SHA2_CTX/g' $> > $@
+
+sha512hl.c:	helper.c
+	sed -e 's/hashinc/sha2.h/g' \
+	    -e 's/HASH/SHA512/g' \
+	    -e 's/SHA[0-9][0-9][0-9]_CTX/SHA2_CTX/g' $> > $@
+
+sha512_256hl.c:	helper.c
+	sed -e 's/hashinc/sha2.h/g' \
+	    -e 's/HASH/SHA512_256/g' \
+	    -e 's/SHA512_256_CTX/SHA2_CTX/g' $> > $@
+
+beforedepend: md5hl.c rmd160hl.c sha1hl.c sha256hl.c sha384hl.c sha512hl.c sha512_256hl.c
diff --git a/src/lib/libc/hash/SipHash24.3 b/src/lib/libc/hash/SipHash24_Init.3
similarity index 96%
rename from src/lib/libc/hash/SipHash24.3
rename to src/lib/libc/hash/SipHash24_Init.3
index 7b95840d..288547fe 100644
--- a/src/lib/libc/hash/SipHash24.3
+++ b/src/lib/libc/hash/SipHash24_Init.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: SipHash24.3,v 1.5 2015/09/14 15:14:55 schwarze Exp $
+.\"	$OpenBSD: SipHash24_Init.3,v 1.1 2019/08/30 22:20:43 deraadt Exp $
 .\"
 .\" Copyright (c) 2014 David Gwynne <dlg@openbsd.org>
 .\"
@@ -14,7 +14,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: September 14 2015 $
+.Dd $Mdocdate: August 30 2019 $
 .Dt SIPHASH24 3
 .Os
 .Sh NAME
diff --git a/src/lib/libc/hash/sha2.3 b/src/lib/libc/hash/sha2.3
deleted file mode 100644
index 370ec989..00000000
--- a/src/lib/libc/hash/sha2.3
+++ /dev/null
@@ -1,350 +0,0 @@
-.\"	$OpenBSD: sha2.3,v 1.27 2019/01/25 00:19:25 millert Exp $
-.\"
-.\" Copyright (c) 2003, 2004 Todd C. Miller <millert@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.\" Sponsored in part by the Defense Advanced Research Projects
-.\" Agency (DARPA) and Air Force Research Laboratory, Air Force
-.\" Materiel Command, USAF, under agreement number F39502-99-1-0512.
-.\"
-.\" See http://www.nist.gov/sha/ for the detailed standard
-.\"
-.Dd $Mdocdate: January 25 2019 $
-.Dt SHA256INIT 3
-.Os
-.Sh NAME
-.Nm SHA224Init ,
-.Nm SHA224Update ,
-.Nm SHA224Pad ,
-.Nm SHA224Final ,
-.Nm SHA224Transform ,
-.Nm SHA224End ,
-.Nm SHA224File ,
-.Nm SHA224FileChunk ,
-.Nm SHA224Data ,
-.Nm SHA256Init ,
-.Nm SHA256Update ,
-.Nm SHA256Pad ,
-.Nm SHA256Final ,
-.Nm SHA256Transform ,
-.Nm SHA256End ,
-.Nm SHA256File ,
-.Nm SHA256FileChunk ,
-.Nm SHA256Data ,
-.Nm SHA384Init ,
-.Nm SHA384Update ,
-.Nm SHA384Pad ,
-.Nm SHA384Final ,
-.Nm SHA384Transform ,
-.Nm SHA384End ,
-.Nm SHA384File ,
-.Nm SHA384FileChunk ,
-.Nm SHA384Data ,
-.Nm SHA512Init ,
-.Nm SHA512Update ,
-.Nm SHA512Pad ,
-.Nm SHA512Final ,
-.Nm SHA512Transform ,
-.Nm SHA512End ,
-.Nm SHA512File ,
-.Nm SHA512FileChunk ,
-.Nm SHA512Data ,
-.Nm SHA512_256Init ,
-.Nm SHA512_256Update ,
-.Nm SHA512_256Pad ,
-.Nm SHA512_256Final ,
-.Nm SHA512_256Transform ,
-.Nm SHA512_256End ,
-.Nm SHA512_256File ,
-.Nm SHA512_256FileChunk ,
-.Nm SHA512_256Data
-.Nd calculate the NIST Secure Hash Standard (version 2)
-.Sh SYNOPSIS
-.In sys/types.h
-.In sha2.h
-.Ft void
-.Fn SHA224Init "SHA2_CTX *context"
-.Ft void
-.Fn SHA224Update "SHA2_CTX *context" "const u_int8_t *data" "size_t len"
-.Ft void
-.Fn SHA224Pad "SHA2_CTX *context"
-.Ft void
-.Fn SHA224Final "u_int8_t digest[SHA224_DIGEST_LENGTH]" "SHA2_CTX *context"
-.Ft void
-.Fn SHA224Transform "u_int32_t state[8]" "const u_int8_t buffer[SHA224_BLOCK_LENGTH]"
-.Ft "char *"
-.Fn SHA224End "SHA2_CTX *context" "char *buf"
-.Ft "char *"
-.Fn SHA224File "const char *filename" "char *buf"
-.Ft "char *"
-.Fn SHA224FileChunk "const char *filename" "char *buf" "off_t offset" "off_t length"
-.Ft "char *"
-.Fn SHA224Data "const u_int8_t *data" "size_t len" "char *buf"
-.Ft void
-.Fn SHA256Init "SHA2_CTX *context"
-.Ft void
-.Fn SHA256Update "SHA2_CTX *context" "const u_int8_t *data" "size_t len"
-.Ft void
-.Fn SHA256Pad "SHA2_CTX *context"
-.Ft void
-.Fn SHA256Final "u_int8_t digest[SHA256_DIGEST_LENGTH]" "SHA2_CTX *context"
-.Ft void
-.Fn SHA256Transform "u_int32_t state[8]" "const u_int8_t buffer[SHA256_BLOCK_LENGTH]"
-.Ft "char *"
-.Fn SHA256End "SHA2_CTX *context" "char *buf"
-.Ft "char *"
-.Fn SHA256File "const char *filename" "char *buf"
-.Ft "char *"
-.Fn SHA256FileChunk "const char *filename" "char *buf" "off_t offset" "off_t length"
-.Ft "char *"
-.Fn SHA256Data "const u_int8_t *data" "size_t len" "char *buf"
-.Ft void
-.Fn SHA384Init "SHA2_CTX *context"
-.Ft void
-.Fn SHA384Update "SHA2_CTX *context" "const u_int8_t *data" "size_t len"
-.Ft void
-.Fn SHA384Pad "SHA2_CTX *context"
-.Ft void
-.Fn SHA384Final "u_int8_t digest[SHA384_DIGEST_LENGTH]" "SHA2_CTX *context"
-.Ft void
-.Fn SHA384Transform "u_int64_t state[8]" "const u_int8_t buffer[SHA384_BLOCK_LENGTH]"
-.Ft "char *"
-.Fn SHA384End "SHA2_CTX *context" "char *buf"
-.Ft "char *"
-.Fn SHA384File "const char *filename" "char *buf"
-.Ft "char *"
-.Fn SHA384FileChunk "const char *filename" "char *buf" "off_t offset" "off_t length"
-.Ft "char *"
-.Fn SHA384Data "const u_int8_t *data" "size_t len" "char *buf"
-.Ft void
-.Fn SHA512Init "SHA2_CTX *context"
-.Ft void
-.Fn SHA512Update "SHA2_CTX *context" "const u_int8_t *data" "size_t len"
-.Ft void
-.Fn SHA512Pad "SHA2_CTX *context"
-.Ft void
-.Fn SHA512Final "u_int8_t digest[SHA512_DIGEST_LENGTH]" "SHA2_CTX *context"
-.Ft void
-.Fn SHA512Transform "u_int64_t state[8]" "const u_int8_t buffer[SHA512_BLOCK_LENGTH]"
-.Ft "char *"
-.Fn SHA512End "SHA2_CTX *context" "char *buf"
-.Ft "char *"
-.Fn SHA512File "const char *filename" "char *buf"
-.Ft "char *"
-.Fn SHA512FileChunk "const char *filename" "char *buf" "off_t offset" "off_t length"
-.Ft "char *"
-.Fn SHA512Data "const u_int8_t *data" "size_t len" "char *buf"
-.Ft void
-.Fn SHA512_256Init "SHA2_CTX *context"
-.Ft void
-.Fn SHA512_256Update "SHA2_CTX *context" "const u_int8_t *data" "size_t len"
-.Ft void
-.Fn SHA512_256Pad "SHA2_CTX *context"
-.Ft void
-.Fn SHA512_256Final "u_int8_t digest[SHA512_256_DIGEST_LENGTH]" "SHA2_CTX *context"
-.Ft void
-.Fn SHA512_256Transform "u_int64_t state[8]" "const u_int8_t buffer[SHA512_256_BLOCK_LENGTH]"
-.Ft "char *"
-.Fn SHA512_256End "SHA2_CTX *context" "char *buf"
-.Ft "char *"
-.Fn SHA512_256File "const char *filename" "char *buf"
-.Ft "char *"
-.Fn SHA512_256FileChunk "const char *filename" "char *buf" "off_t offset" "off_t length"
-.Ft "char *"
-.Fn SHA512_256Data "const u_int8_t *data" "size_t len" "char *buf"
-.Sh DESCRIPTION
-The SHA2 functions implement the NIST Secure Hash Standard,
-FIPS PUB 180-2.
-The SHA2 functions are used to generate a condensed representation of a
-message called a message digest, suitable for use as a digital signature.
-There are four families of functions, with names corresponding to
-the number of bits in the resulting message digest.
-The SHA-224 and SHA-256 functions are limited to processing a message of less
-than 2^64 bits as input.
-The SHA-384 and SHA-512 functions can process a message of at most 2^128 - 1
-bits as input.
-.Pp
-The SHA2 functions are considered to be more secure than the
-.Xr sha1 3
-functions with which they share a similar interface.
-The 224, 256, 384, and 512-bit versions of SHA2 share the same interface.
-SHA512/256, a truncated version of SHA512, is also supported.
-For brevity, only the 256-bit variants are described below.
-.Pp
-The
-.Fn SHA256Init
-function initializes a SHA2_CTX
-.Fa context
-for use with
-.Fn SHA256Update
-and
-.Fn SHA256Final .
-The
-.Fn SHA256Update
-function adds
-.Fa data
-of length
-.Fa len
-to the SHA2_CTX specified by
-.Fa context .
-.Fn SHA256Final
-is called when all data has been added via
-.Fn SHA256Update
-and stores a message digest in the
-.Fa digest
-parameter.
-.Pp
-The
-.Fn SHA256Pad
-function can be used to apply padding to the message digest as in
-.Fn SHA256Final ,
-but the current context can still be used with
-.Fn SHA256Update .
-.Pp
-The
-.Fn SHA256Transform
-function is used by
-.Fn SHA256Update
-to hash 512-bit blocks and forms the core of the algorithm.
-Most programs should use the interface provided by
-.Fn SHA256Init ,
-.Fn SHA256Update ,
-and
-.Fn SHA256Final
-instead of calling
-.Fn SHA256Transform
-directly.
-.Pp
-The
-.Fn SHA256End
-function is a front end for
-.Fn SHA256Final
-which converts the digest into an
-.Tn ASCII
-representation of the digest in hexadecimal.
-.Pp
-The
-.Fn SHA256File
-function calculates the digest for a file and returns the result via
-.Fn SHA256End .
-If
-.Fn SHA256File
-is unable to open the file, a
-.Dv NULL
-pointer is returned.
-.Pp
-.Fn SHA256FileChunk
-behaves like
-.Fn SHA256File
-but calculates the digest only for that portion of the file starting at
-.Fa offset
-and continuing for
-.Fa length
-bytes or until end of file is reached, whichever comes first.
-A zero
-.Fa length
-can be specified to read until end of file.
-A negative
-.Fa length
-or
-.Fa offset
-will be ignored.
-.Pp
-The
-.Fn SHA256Data
-function
-calculates the digest of an arbitrary string and returns the result via
-.Fn SHA256End .
-.Pp
-For each of the
-.Fn SHA256End ,
-.Fn SHA256File ,
-.Fn SHA256FileChunk ,
-and
-.Fn SHA256Data
-functions the
-.Fa buf
-parameter should either be a string large enough to hold the resulting digest
-(e.g.\&
-.Dv SHA224_DIGEST_STRING_LENGTH ,
-.Dv SHA256_DIGEST_STRING_LENGTH ,
-.Dv SHA384_DIGEST_STRING_LENGTH ,
-.Dv SHA512_DIGEST_STRING_LENGTH ,
-or
-.Dv SHA512_256_DIGEST_STRING_LENGTH ,
-depending on the function being used)
-or a
-.Dv NULL
-pointer.
-In the latter case, space will be dynamically allocated via
-.Xr malloc 3
-and should be freed using
-.Xr free 3
-when it is no longer needed.
-.Sh EXAMPLES
-The following code fragment will calculate the SHA-256 digest for the string
-.Qq abc ,
-which is
-.Dq 0xba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad .
-.Bd -literal -offset indent
-SHA2_CTX ctx;
-u_int8_t results[SHA256_DIGEST_LENGTH];
-char *buf;
-int n;
-
-buf = "abc";
-n = strlen(buf);
-SHA256Init(&ctx);
-SHA256Update(&ctx, (u_int8_t *)buf, n);
-SHA256Final(results, &ctx);
-
-/* Print the digest as one long hex value */
-printf("0x");
-for (n = 0; n \*(Lt SHA256_DIGEST_LENGTH; n++)
-	printf("%02x", results[n]);
-putchar('\en');
-.Ed
-.Pp
-Alternately, the helper functions could be used in the following way:
-.Bd -literal -offset indent
-u_int8_t output[SHA256_DIGEST_STRING_LENGTH];
-char *buf = "abc";
-
-printf("0x%s\en", SHA256Data(buf, strlen(buf), output));
-.Ed
-.Sh SEE ALSO
-.Xr cksum 1 ,
-.Xr md5 3 ,
-.Xr rmd160 3 ,
-.Xr sha1 3
-.Rs
-.%T Secure Hash Standard
-.%O FIPS PUB 180-2
-.Re
-.Sh HISTORY
-The SHA2 functions appeared in
-.Ox 3.4 .
-.Sh AUTHORS
-.An -nosplit
-This implementation of the SHA functions was written by
-.An Aaron D. Gifford .
-.Pp
-The
-.Fn SHA256End ,
-.Fn SHA256File ,
-.Fn SHA256FileChunk ,
-and
-.Fn SHA256Data
-helper functions are derived from code written by
-.An Poul-Henning Kamp .