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policycoreutils/0020-semodule-add-m-checksum-option.patch
Petr Lautrbach da97ea7d41 policycoreutils-3.3-2 
- setfiles/restorecon: support parallel relabeling with -T <N> option
- semodule: add -m | --checksum option
Resolves: rhbz#2026682, rhbz#2026680
2021-11-29 14:29:27 +01:00

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From 4e6165719d3315b6502f3d290a549f9fa14c3238 Mon Sep 17 00:00:00 2001
From: Petr Lautrbach <plautrba@redhat.com>
Date: Tue, 16 Nov 2021 14:27:11 +0100
Subject: [PATCH] semodule: add -m | --checksum option
Since cil doesn't store module name and module version in module itself,
there's no simple way how to compare that installed module is the same
version as the module which is supposed to be installed. Even though the
version was not used by semodule itself, it was apparently used by some
team.
With `semodule -l --checksum` users get SHA256 hashes of modules and
could compare them with their files which is faster than installing
modules again and again.
E.g.
# time (
semodule -l --checksum | grep localmodule
/usr/libexec/selinux/hll/pp localmodule.pp | sha256sum
)
localmodule db002f64ddfa3983257b42b54da7b182c9b2e476f47880ae3494f9099e1a42bd
db002f64ddfa3983257b42b54da7b182c9b2e476f47880ae3494f9099e1a42bd -
real 0m0.876s
user 0m0.849s
sys 0m0.028s
vs
# time semodule -i localmodule.pp
real 0m6.147s
user 0m5.800s
sys 0m0.231s
Signed-off-by: Petr Lautrbach <plautrba@redhat.com>
Acked-by: James Carter <jwcart2@gmail.com>
---
policycoreutils/semodule/Makefile | 2 +-
policycoreutils/semodule/semodule.8 | 6 +
policycoreutils/semodule/semodule.c | 95 ++++++++-
policycoreutils/semodule/sha256.c | 294 ++++++++++++++++++++++++++++
policycoreutils/semodule/sha256.h | 89 +++++++++
5 files changed, 480 insertions(+), 6 deletions(-)
create mode 100644 policycoreutils/semodule/sha256.c
create mode 100644 policycoreutils/semodule/sha256.h
diff --git a/policycoreutils/semodule/Makefile b/policycoreutils/semodule/Makefile
index 73801e487a76..9875ac383280 100644
--- a/policycoreutils/semodule/Makefile
+++ b/policycoreutils/semodule/Makefile
@@ -6,7 +6,7 @@ MANDIR = $(PREFIX)/share/man
CFLAGS ?= -Werror -Wall -W
override LDLIBS += -lsepol -lselinux -lsemanage
-SEMODULE_OBJS = semodule.o
+SEMODULE_OBJS = semodule.o sha256.o
all: semodule genhomedircon
diff --git a/policycoreutils/semodule/semodule.8 b/policycoreutils/semodule/semodule.8
index 18d4f708661c..3a2fb21c2481 100644
--- a/policycoreutils/semodule/semodule.8
+++ b/policycoreutils/semodule/semodule.8
@@ -95,6 +95,9 @@ only modules listed in \-\-extract after this option.
.B \-H,\-\-hll
Extract module as an HLL file. This only affects the \-\-extract option and
only modules listed in \-\-extract after this option.
+.TP
+.B \-m,\-\-checksum
+Add SHA256 checksum of modules to the list output.
.SH EXAMPLE
.nf
@@ -130,6 +133,9 @@ $ semodule \-B \-S "/tmp/var/lib/selinux"
# Write the HLL version of puppet and the CIL version of wireshark
# modules at priority 400 to the current working directory
$ semodule \-X 400 \-\-hll \-E puppet \-\-cil \-E wireshark
+# Check whether a module in "localmodule.pp" file is same as installed module "localmodule"
+$ /usr/libexec/selinux/hll/pp localmodule.pp | sha256sum
+$ semodule -l -m | grep localmodule
.fi
.SH SEE ALSO
diff --git a/policycoreutils/semodule/semodule.c b/policycoreutils/semodule/semodule.c
index c815f01546b4..ddbf10455abf 100644
--- a/policycoreutils/semodule/semodule.c
+++ b/policycoreutils/semodule/semodule.c
@@ -25,6 +25,8 @@
#include <sepol/cil/cil.h>
#include <semanage/modules.h>
+#include "sha256.h"
+
enum client_modes {
NO_MODE, INSTALL_M, REMOVE_M, EXTRACT_M, CIL_M, HLL_M,
LIST_M, RELOAD, PRIORITY_M, ENABLE_M, DISABLE_M
@@ -57,6 +59,7 @@ static semanage_handle_t *sh = NULL;
static char *store;
static char *store_root;
int extract_cil = 0;
+static int checksum = 0;
extern char *optarg;
extern int optind;
@@ -147,6 +150,7 @@ static void usage(char *progname)
printf(" -S,--store-path use an alternate path for the policy store root\n");
printf(" -c, --cil extract module as cil. This only affects module extraction.\n");
printf(" -H, --hll extract module as hll. This only affects module extraction.\n");
+ printf(" -m, --checksum print module checksum (SHA256).\n");
}
/* Sets the global mode variable to new_mode, but only if no other
@@ -200,6 +204,7 @@ static void parse_command_line(int argc, char **argv)
{"disable", required_argument, NULL, 'd'},
{"path", required_argument, NULL, 'p'},
{"store-path", required_argument, NULL, 'S'},
+ {"checksum", 0, NULL, 'm'},
{NULL, 0, NULL, 0}
};
int extract_selected = 0;
@@ -210,7 +215,7 @@ static void parse_command_line(int argc, char **argv)
no_reload = 0;
priority = 400;
while ((i =
- getopt_long(argc, argv, "s:b:hi:l::vr:u:RnNBDCPX:e:d:p:S:E:cH", opts,
+ getopt_long(argc, argv, "s:b:hi:l::vr:u:RnNBDCPX:e:d:p:S:E:cHm", opts,
NULL)) != -1) {
switch (i) {
case 'b':
@@ -287,6 +292,9 @@ static void parse_command_line(int argc, char **argv)
case 'd':
set_mode(DISABLE_M, optarg);
break;
+ case 'm':
+ checksum = 1;
+ break;
case '?':
default:{
usage(argv[0]);
@@ -338,6 +346,61 @@ static void parse_command_line(int argc, char **argv)
}
}
+/* Get module checksum */
+static char *hash_module_data(const char *module_name, const int prio) {
+ semanage_module_info_t *extract_info = NULL;
+ semanage_module_key_t *modkey = NULL;
+ Sha256Context context;
+ uint8_t sha256_hash[SHA256_HASH_SIZE];
+ char *sha256_buf = NULL;
+ void *data;
+ size_t data_len = 0, i;
+ int result;
+
+ result = semanage_module_key_create(sh, &modkey);
+ if (result != 0) {
+ goto cleanup_extract;
+ }
+
+ result = semanage_module_key_set_name(sh, modkey, module_name);
+ if (result != 0) {
+ goto cleanup_extract;
+ }
+
+ result = semanage_module_key_set_priority(sh, modkey, prio);
+ if (result != 0) {
+ goto cleanup_extract;
+ }
+
+ result = semanage_module_extract(sh, modkey, 1, &data, &data_len,
+ &extract_info);
+ if (result != 0) {
+ goto cleanup_extract;
+ }
+
+ Sha256Initialise(&context);
+ Sha256Update(&context, data, data_len);
+
+ Sha256Finalise(&context, (SHA256_HASH *)sha256_hash);
+
+ sha256_buf = calloc(1, SHA256_HASH_SIZE * 2 + 1);
+
+ if (sha256_buf == NULL)
+ goto cleanup_extract;
+
+ for (i = 0; i < SHA256_HASH_SIZE; i++) {
+ sprintf((&sha256_buf[i * 2]), "%02x", sha256_hash[i]);
+ }
+ sha256_buf[i * 2] = 0;
+
+cleanup_extract:
+ semanage_module_info_destroy(sh, extract_info);
+ free(extract_info);
+ semanage_module_key_destroy(sh, modkey);
+ free(modkey);
+ return sha256_buf;
+}
+
int main(int argc, char *argv[])
{
int i, commit = 0;
@@ -546,6 +609,8 @@ cleanup_extract:
int modinfos_len = 0;
semanage_module_info_t *m = NULL;
int j = 0;
+ char *module_checksum = NULL;
+ uint16_t pri = 0;
if (verbose) {
printf
@@ -570,7 +635,18 @@ cleanup_extract:
result = semanage_module_info_get_name(sh, m, &name);
if (result != 0) goto cleanup_list;
- printf("%s\n", name);
+ result = semanage_module_info_get_priority(sh, m, &pri);
+ if (result != 0) goto cleanup_list;
+
+ printf("%s", name);
+ if (checksum) {
+ module_checksum = hash_module_data(name, pri);
+ if (module_checksum) {
+ printf(" %s", module_checksum);
+ free(module_checksum);
+ }
+ }
+ printf("\n");
}
}
else if (strcmp(mode_arg, "full") == 0) {
@@ -585,11 +661,12 @@ cleanup_extract:
}
/* calculate column widths */
- size_t column[4] = { 0, 0, 0, 0 };
+ size_t column[5] = { 0, 0, 0, 0, 0 };
/* fixed width columns */
column[0] = sizeof("000") - 1;
column[3] = sizeof("disabled") - 1;
+ column[4] = 64; /* SHA256_HASH_SIZE * 2 */
/* variable width columns */
const char *tmp = NULL;
@@ -612,7 +689,6 @@ cleanup_extract:
/* print out each module */
for (j = 0; j < modinfos_len; j++) {
- uint16_t pri = 0;
const char *name = NULL;
int enabled = 0;
const char *lang_ext = NULL;
@@ -631,11 +707,20 @@ cleanup_extract:
result = semanage_module_info_get_lang_ext(sh, m, &lang_ext);
if (result != 0) goto cleanup_list;
- printf("%0*u %-*s %-*s %-*s\n",
+ printf("%0*u %-*s %-*s %-*s",
(int)column[0], pri,
(int)column[1], name,
(int)column[2], lang_ext,
(int)column[3], enabled ? "" : "disabled");
+ if (checksum) {
+ module_checksum = hash_module_data(name, pri);
+ if (module_checksum) {
+ printf(" %-*s", (int)column[4], module_checksum);
+ free(module_checksum);
+ }
+ }
+ printf("\n");
+
}
}
else {
diff --git a/policycoreutils/semodule/sha256.c b/policycoreutils/semodule/sha256.c
new file mode 100644
index 000000000000..fe2aeef07f53
--- /dev/null
+++ b/policycoreutils/semodule/sha256.c
@@ -0,0 +1,294 @@
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// WjCryptLib_Sha256
+//
+// Implementation of SHA256 hash function.
+// Original author: Tom St Denis, tomstdenis@gmail.com, http://libtom.org
+// Modified by WaterJuice retaining Public Domain license.
+//
+// This is free and unencumbered software released into the public domain - June 2013 waterjuice.org
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// IMPORTS
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#include "sha256.h"
+#include <memory.h>
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// MACROS
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#define ror(value, bits) (((value) >> (bits)) | ((value) << (32 - (bits))))
+
+#define MIN(x, y) ( ((x)<(y))?(x):(y) )
+
+#define STORE32H(x, y) \
+ { (y)[0] = (uint8_t)(((x)>>24)&255); (y)[1] = (uint8_t)(((x)>>16)&255); \
+ (y)[2] = (uint8_t)(((x)>>8)&255); (y)[3] = (uint8_t)((x)&255); }
+
+#define LOAD32H(x, y) \
+ { x = ((uint32_t)((y)[0] & 255)<<24) | \
+ ((uint32_t)((y)[1] & 255)<<16) | \
+ ((uint32_t)((y)[2] & 255)<<8) | \
+ ((uint32_t)((y)[3] & 255)); }
+
+#define STORE64H(x, y) \
+ { (y)[0] = (uint8_t)(((x)>>56)&255); (y)[1] = (uint8_t)(((x)>>48)&255); \
+ (y)[2] = (uint8_t)(((x)>>40)&255); (y)[3] = (uint8_t)(((x)>>32)&255); \
+ (y)[4] = (uint8_t)(((x)>>24)&255); (y)[5] = (uint8_t)(((x)>>16)&255); \
+ (y)[6] = (uint8_t)(((x)>>8)&255); (y)[7] = (uint8_t)((x)&255); }
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// CONSTANTS
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+// The K array
+static const uint32_t K[64] = {
+ 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL,
+ 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL,
+ 0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL,
+ 0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
+ 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL,
+ 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL,
+ 0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL,
+ 0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
+ 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL,
+ 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL,
+ 0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL,
+ 0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
+ 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
+};
+
+#define BLOCK_SIZE 64
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// INTERNAL FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+// Various logical functions
+#define Ch( x, y, z ) (z ^ (x & (y ^ z)))
+#define Maj( x, y, z ) (((x | y) & z) | (x & y))
+#define S( x, n ) ror((x),(n))
+#define R( x, n ) (((x)&0xFFFFFFFFUL)>>(n))
+#define Sigma0( x ) (S(x, 2) ^ S(x, 13) ^ S(x, 22))
+#define Sigma1( x ) (S(x, 6) ^ S(x, 11) ^ S(x, 25))
+#define Gamma0( x ) (S(x, 7) ^ S(x, 18) ^ R(x, 3))
+#define Gamma1( x ) (S(x, 17) ^ S(x, 19) ^ R(x, 10))
+
+#define Sha256Round( a, b, c, d, e, f, g, h, i ) \
+ t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
+ t1 = Sigma0(a) + Maj(a, b, c); \
+ d += t0; \
+ h = t0 + t1;
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// TransformFunction
+//
+// Compress 512-bits
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+static
+void
+ TransformFunction
+ (
+ Sha256Context* Context,
+ uint8_t const* Buffer
+ )
+{
+ uint32_t S[8];
+ uint32_t W[64];
+ uint32_t t0;
+ uint32_t t1;
+ uint32_t t;
+ int i;
+
+ // Copy state into S
+ for( i=0; i<8; i++ )
+ {
+ S[i] = Context->state[i];
+ }
+
+ // Copy the state into 512-bits into W[0..15]
+ for( i=0; i<16; i++ )
+ {
+ LOAD32H( W[i], Buffer + (4*i) );
+ }
+
+ // Fill W[16..63]
+ for( i=16; i<64; i++ )
+ {
+ W[i] = Gamma1( W[i-2]) + W[i-7] + Gamma0( W[i-15] ) + W[i-16];
+ }
+
+ // Compress
+ for( i=0; i<64; i++ )
+ {
+ Sha256Round( S[0], S[1], S[2], S[3], S[4], S[5], S[6], S[7], i );
+ t = S[7];
+ S[7] = S[6];
+ S[6] = S[5];
+ S[5] = S[4];
+ S[4] = S[3];
+ S[3] = S[2];
+ S[2] = S[1];
+ S[1] = S[0];
+ S[0] = t;
+ }
+
+ // Feedback
+ for( i=0; i<8; i++ )
+ {
+ Context->state[i] = Context->state[i] + S[i];
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// PUBLIC FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Sha256Initialise
+//
+// Initialises a SHA256 Context. Use this to initialise/reset a context.
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+void
+ Sha256Initialise
+ (
+ Sha256Context* Context // [out]
+ )
+{
+ Context->curlen = 0;
+ Context->length = 0;
+ Context->state[0] = 0x6A09E667UL;
+ Context->state[1] = 0xBB67AE85UL;
+ Context->state[2] = 0x3C6EF372UL;
+ Context->state[3] = 0xA54FF53AUL;
+ Context->state[4] = 0x510E527FUL;
+ Context->state[5] = 0x9B05688CUL;
+ Context->state[6] = 0x1F83D9ABUL;
+ Context->state[7] = 0x5BE0CD19UL;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Sha256Update
+//
+// Adds data to the SHA256 context. This will process the data and update the internal state of the context. Keep on
+// calling this function until all the data has been added. Then call Sha256Finalise to calculate the hash.
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+void
+ Sha256Update
+ (
+ Sha256Context* Context, // [in out]
+ void const* Buffer, // [in]
+ uint32_t BufferSize // [in]
+ )
+{
+ uint32_t n;
+
+ if( Context->curlen > sizeof(Context->buf) )
+ {
+ return;
+ }
+
+ while( BufferSize > 0 )
+ {
+ if( Context->curlen == 0 && BufferSize >= BLOCK_SIZE )
+ {
+ TransformFunction( Context, (uint8_t*)Buffer );
+ Context->length += BLOCK_SIZE * 8;
+ Buffer = (uint8_t*)Buffer + BLOCK_SIZE;
+ BufferSize -= BLOCK_SIZE;
+ }
+ else
+ {
+ n = MIN( BufferSize, (BLOCK_SIZE - Context->curlen) );
+ memcpy( Context->buf + Context->curlen, Buffer, (size_t)n );
+ Context->curlen += n;
+ Buffer = (uint8_t*)Buffer + n;
+ BufferSize -= n;
+ if( Context->curlen == BLOCK_SIZE )
+ {
+ TransformFunction( Context, Context->buf );
+ Context->length += 8*BLOCK_SIZE;
+ Context->curlen = 0;
+ }
+ }
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Sha256Finalise
+//
+// Performs the final calculation of the hash and returns the digest (32 byte buffer containing 256bit hash). After
+// calling this, Sha256Initialised must be used to reuse the context.
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+void
+ Sha256Finalise
+ (
+ Sha256Context* Context, // [in out]
+ SHA256_HASH* Digest // [out]
+ )
+{
+ int i;
+
+ if( Context->curlen >= sizeof(Context->buf) )
+ {
+ return;
+ }
+
+ // Increase the length of the message
+ Context->length += Context->curlen * 8;
+
+ // Append the '1' bit
+ Context->buf[Context->curlen++] = (uint8_t)0x80;
+
+ // if the length is currently above 56 bytes we append zeros
+ // then compress. Then we can fall back to padding zeros and length
+ // encoding like normal.
+ if( Context->curlen > 56 )
+ {
+ while( Context->curlen < 64 )
+ {
+ Context->buf[Context->curlen++] = (uint8_t)0;
+ }
+ TransformFunction(Context, Context->buf);
+ Context->curlen = 0;
+ }
+
+ // Pad up to 56 bytes of zeroes
+ while( Context->curlen < 56 )
+ {
+ Context->buf[Context->curlen++] = (uint8_t)0;
+ }
+
+ // Store length
+ STORE64H( Context->length, Context->buf+56 );
+ TransformFunction( Context, Context->buf );
+
+ // Copy output
+ for( i=0; i<8; i++ )
+ {
+ STORE32H( Context->state[i], Digest->bytes+(4*i) );
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Sha256Calculate
+//
+// Combines Sha256Initialise, Sha256Update, and Sha256Finalise into one function. Calculates the SHA256 hash of the
+// buffer.
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+void
+ Sha256Calculate
+ (
+ void const* Buffer, // [in]
+ uint32_t BufferSize, // [in]
+ SHA256_HASH* Digest // [in]
+ )
+{
+ Sha256Context context;
+
+ Sha256Initialise( &context );
+ Sha256Update( &context, Buffer, BufferSize );
+ Sha256Finalise( &context, Digest );
+}
diff --git a/policycoreutils/semodule/sha256.h b/policycoreutils/semodule/sha256.h
new file mode 100644
index 000000000000..406ed869cd82
--- /dev/null
+++ b/policycoreutils/semodule/sha256.h
@@ -0,0 +1,89 @@
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// WjCryptLib_Sha256
+//
+// Implementation of SHA256 hash function.
+// Original author: Tom St Denis, tomstdenis@gmail.com, http://libtom.org
+// Modified by WaterJuice retaining Public Domain license.
+//
+// This is free and unencumbered software released into the public domain - June 2013 waterjuice.org
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// IMPORTS
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#include <stdint.h>
+#include <stdio.h>
+
+typedef struct
+{
+ uint64_t length;
+ uint32_t state[8];
+ uint32_t curlen;
+ uint8_t buf[64];
+} Sha256Context;
+
+#define SHA256_HASH_SIZE ( 256 / 8 )
+
+typedef struct
+{
+ uint8_t bytes [SHA256_HASH_SIZE];
+} SHA256_HASH;
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// PUBLIC FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Sha256Initialise
+//
+// Initialises a SHA256 Context. Use this to initialise/reset a context.
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+void
+ Sha256Initialise
+ (
+ Sha256Context* Context // [out]
+ );
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Sha256Update
+//
+// Adds data to the SHA256 context. This will process the data and update the internal state of the context. Keep on
+// calling this function until all the data has been added. Then call Sha256Finalise to calculate the hash.
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+void
+ Sha256Update
+ (
+ Sha256Context* Context, // [in out]
+ void const* Buffer, // [in]
+ uint32_t BufferSize // [in]
+ );
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Sha256Finalise
+//
+// Performs the final calculation of the hash and returns the digest (32 byte buffer containing 256bit hash). After
+// calling this, Sha256Initialised must be used to reuse the context.
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+void
+ Sha256Finalise
+ (
+ Sha256Context* Context, // [in out]
+ SHA256_HASH* Digest // [out]
+ );
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Sha256Calculate
+//
+// Combines Sha256Initialise, Sha256Update, and Sha256Finalise into one function. Calculates the SHA256 hash of the
+// buffer.
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+void
+ Sha256Calculate
+ (
+ void const* Buffer, // [in]
+ uint32_t BufferSize, // [in]
+ SHA256_HASH* Digest // [in]
+ );
--
2.33.1
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