diff --git a/.gitignore b/.gitignore
index 60a3b4e..a5716d2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 # Files to ignore by git
 #
-# Version: 20200912
+# Version: 20230405
 
 # Generic auto-generated build files
 *~
@@ -82,6 +82,7 @@ stamp-h[1-9]
 /m4/ltsugar.m4
 /m4/ltversion.m4
 /m4/nls.m4
+/m4/pkg.m4
 /m4/po.m4
 /m4/printf-posix.m4
 /m4/progtest.m4
diff --git a/autogen.sh b/autogen.sh
index 48276a3..83f54ea 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Script to generate ./configure using the autotools
 #
-# Version: 20220709
+# Version: 20230405
 
 EXIT_SUCCESS=0;
 EXIT_FAILURE=1;
@@ -133,7 +133,7 @@ else
 		exit $?;
 	fi
 
-	${ACLOCAL} --force -I m4;
+	${ACLOCAL} --force --install -I m4;
 	if test $? -ne 0;
 	then
 		exit $?;
diff --git a/configure.ac b/configure.ac
index d24441d..2296ba6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@ AC_PREREQ([2.71])
 
 AC_INIT(
  [libhmac],
- [20230205],
+ [20230407],
  [joachim.metz@gmail.com])
 
 AC_CONFIG_SRCDIR(
diff --git a/libhmac/libhmac_md5_context.c b/libhmac/libhmac_md5_context.c
index f8038d5..58f59e8 100644
--- a/libhmac/libhmac_md5_context.c
+++ b/libhmac/libhmac_md5_context.c
@@ -40,8 +40,6 @@
 
 #if !defined( LIBHMAC_HAVE_MD5_SUPPORT )
 
-#define LIBHMAC_MD5_BLOCK_SIZE	64
-
 /* RFC 1321 based MD5 functions
  */
 
@@ -857,6 +855,17 @@ int libhmac_md5_context_update(
 	}
 	if( internal_context->block_offset > 0 )
 	{
+		if( internal_context->block_offset >= LIBHMAC_MD5_BLOCK_SIZE )
+		{
+			libcerror_error_set(
+			 error,
+			 LIBCERROR_ERROR_DOMAIN_RUNTIME,
+			 LIBCERROR_RUNTIME_ERROR_VALUE_OUT_OF_BOUNDS,
+			 "%s: invalid context - block offset value out of bounds.",
+			 function );
+
+			return( -1 );
+		}
 		remaining_block_size = LIBHMAC_MD5_BLOCK_SIZE - internal_context->block_offset;
 
 		if( remaining_block_size > size )
diff --git a/libhmac/libhmac_md5_context.h b/libhmac/libhmac_md5_context.h
index e413e16..87891ec 100644
--- a/libhmac/libhmac_md5_context.h
+++ b/libhmac/libhmac_md5_context.h
@@ -48,6 +48,8 @@ extern "C" {
 
 #endif
 
+#define LIBHMAC_MD5_BLOCK_SIZE	64
+
 typedef struct libhmac_internal_md5_context libhmac_internal_md5_context_t;
 
 struct libhmac_internal_md5_context
@@ -81,7 +83,7 @@ struct libhmac_internal_md5_context
 
 	/* The (data) block
 	 */
-	uint8_t block[ 128 ];
+	uint8_t block[ 2 * LIBHMAC_MD5_BLOCK_SIZE ];
 
 #endif /* defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_MD5_H ) && defined( MD5_DIGEST_LENGTH ) */
 };
diff --git a/libhmac/libhmac_sha1_context.c b/libhmac/libhmac_sha1_context.c
index 073db14..19d2638 100644
--- a/libhmac/libhmac_sha1_context.c
+++ b/libhmac/libhmac_sha1_context.c
@@ -39,8 +39,6 @@
 
 #if !defined( LIBHMAC_HAVE_SHA1_SUPPORT )
 
-#define LIBHMAC_SHA1_BLOCK_SIZE	64
-
 /* RFC 3174/FIPS 180-1 based SHA-1 functions
  */
 
@@ -930,6 +928,17 @@ int libhmac_sha1_context_update(
 	}
 	if( internal_context->block_offset > 0 )
 	{
+		if( internal_context->block_offset >= LIBHMAC_SHA1_BLOCK_SIZE )
+		{
+			libcerror_error_set(
+			 error,
+			 LIBCERROR_ERROR_DOMAIN_RUNTIME,
+			 LIBCERROR_RUNTIME_ERROR_VALUE_OUT_OF_BOUNDS,
+			 "%s: invalid context - block offset value out of bounds.",
+			 function );
+
+			return( -1 );
+		}
 		remaining_block_size = LIBHMAC_SHA1_BLOCK_SIZE - internal_context->block_offset;
 
 		if( remaining_block_size > size )
diff --git a/libhmac/libhmac_sha1_context.h b/libhmac/libhmac_sha1_context.h
index 6eb9bd0..be89bd5 100644
--- a/libhmac/libhmac_sha1_context.h
+++ b/libhmac/libhmac_sha1_context.h
@@ -48,6 +48,8 @@ extern "C" {
 
 #endif
 
+#define LIBHMAC_SHA1_BLOCK_SIZE	64
+
 typedef struct libhmac_internal_sha1_context libhmac_internal_sha1_context_t;
 
 struct libhmac_internal_sha1_context
@@ -81,7 +83,7 @@ struct libhmac_internal_sha1_context
 
 	/* The (data) block
 	 */
-	uint8_t block[ 128 ];
+	uint8_t block[ 2 * LIBHMAC_SHA1_BLOCK_SIZE ];
 
 #endif /* defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_SHA_H ) && defined( SHA_DIGEST_LENGTH ) */
 };
diff --git a/libhmac/libhmac_sha224_context.c b/libhmac/libhmac_sha224_context.c
index e119d94..4ea42fb 100644
--- a/libhmac/libhmac_sha224_context.c
+++ b/libhmac/libhmac_sha224_context.c
@@ -39,8 +39,6 @@
 
 #if !defined( LIBHMAC_HAVE_SHA224_SUPPORT )
 
-#define LIBHMAC_SHA224_BLOCK_SIZE	64
-
 /* FIPS 180-2 based SHA-224 functions
  */
 
@@ -889,6 +887,17 @@ int libhmac_sha224_context_update(
 	}
 	if( internal_context->block_offset > 0 )
 	{
+		if( internal_context->block_offset >= LIBHMAC_SHA224_BLOCK_SIZE )
+		{
+			libcerror_error_set(
+			 error,
+			 LIBCERROR_ERROR_DOMAIN_RUNTIME,
+			 LIBCERROR_RUNTIME_ERROR_VALUE_OUT_OF_BOUNDS,
+			 "%s: invalid context - block offset value out of bounds.",
+			 function );
+
+			return( -1 );
+		}
 		remaining_block_size = LIBHMAC_SHA224_BLOCK_SIZE - internal_context->block_offset;
 
 		if( remaining_block_size > size )
diff --git a/libhmac/libhmac_sha224_context.h b/libhmac/libhmac_sha224_context.h
index 4924bf6..e644224 100644
--- a/libhmac/libhmac_sha224_context.h
+++ b/libhmac/libhmac_sha224_context.h
@@ -48,6 +48,8 @@ extern "C" {
 
 #endif
 
+#define LIBHMAC_SHA224_BLOCK_SIZE	64
+
 typedef struct libhmac_internal_sha224_context libhmac_internal_sha224_context_t;
 
 struct libhmac_internal_sha224_context
@@ -81,7 +83,7 @@ struct libhmac_internal_sha224_context
 
 	/* The (data) block
 	 */
-	uint8_t block[ 128 ];
+	uint8_t block[ 2 * LIBHMAC_SHA224_BLOCK_SIZE ];
 
 #endif /* defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_SHA_H ) && defined( SHA224_DIGEST_LENGTH ) */
 };
diff --git a/libhmac/libhmac_sha256_context.c b/libhmac/libhmac_sha256_context.c
index b971b28..50288fd 100644
--- a/libhmac/libhmac_sha256_context.c
+++ b/libhmac/libhmac_sha256_context.c
@@ -39,8 +39,6 @@
 
 #if !defined( LIBHMAC_HAVE_SHA256_SUPPORT )
 
-#define LIBHMAC_SHA256_BLOCK_SIZE	64
-
 /* FIPS 180-2 based SHA-256 functions
  */
 
@@ -889,6 +887,17 @@ int libhmac_sha256_context_update(
 	}
 	if( internal_context->block_offset > 0 )
 	{
+		if( internal_context->block_offset >= LIBHMAC_SHA256_BLOCK_SIZE )
+		{
+			libcerror_error_set(
+			 error,
+			 LIBCERROR_ERROR_DOMAIN_RUNTIME,
+			 LIBCERROR_RUNTIME_ERROR_VALUE_OUT_OF_BOUNDS,
+			 "%s: invalid context - block offset value out of bounds.",
+			 function );
+
+			return( -1 );
+		}
 		remaining_block_size = LIBHMAC_SHA256_BLOCK_SIZE - internal_context->block_offset;
 
 		if( remaining_block_size > size )
diff --git a/libhmac/libhmac_sha256_context.h b/libhmac/libhmac_sha256_context.h
index 87cbe57..b5ecd7f 100644
--- a/libhmac/libhmac_sha256_context.h
+++ b/libhmac/libhmac_sha256_context.h
@@ -48,6 +48,8 @@ extern "C" {
 
 #endif
 
+#define LIBHMAC_SHA256_BLOCK_SIZE	64
+
 typedef struct libhmac_internal_sha256_context libhmac_internal_sha256_context_t;
 
 struct libhmac_internal_sha256_context
@@ -81,7 +83,7 @@ struct libhmac_internal_sha256_context
 
 	/* The (data) block
 	 */
-	uint8_t block[ 128 ];
+	uint8_t block[ 2 * LIBHMAC_SHA256_BLOCK_SIZE ];
 
 #endif /* defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_SHA_H ) && defined( SHA256_DIGEST_LENGTH ) */
 };
diff --git a/libhmac/libhmac_sha512_context.c b/libhmac/libhmac_sha512_context.c
index 7c0fef1..0c50049 100644
--- a/libhmac/libhmac_sha512_context.c
+++ b/libhmac/libhmac_sha512_context.c
@@ -39,8 +39,6 @@
 
 #if !defined( LIBHMAC_HAVE_SHA512_SUPPORT )
 
-#define LIBHMAC_SHA512_BLOCK_SIZE	128
-
 /* FIPS 180-2 based SHA-512 functions
  */
 
@@ -925,6 +923,17 @@ int libhmac_sha512_context_update(
 	}
 	if( internal_context->block_offset > 0 )
 	{
+		if( internal_context->block_offset >= LIBHMAC_SHA512_BLOCK_SIZE )
+		{
+			libcerror_error_set(
+			 error,
+			 LIBCERROR_ERROR_DOMAIN_RUNTIME,
+			 LIBCERROR_RUNTIME_ERROR_VALUE_OUT_OF_BOUNDS,
+			 "%s: invalid context - block offset value out of bounds.",
+			 function );
+
+			return( -1 );
+		}
 		remaining_block_size = LIBHMAC_SHA512_BLOCK_SIZE - internal_context->block_offset;
 
 		if( remaining_block_size > size )
diff --git a/libhmac/libhmac_sha512_context.h b/libhmac/libhmac_sha512_context.h
index e65921d..179351d 100644
--- a/libhmac/libhmac_sha512_context.h
+++ b/libhmac/libhmac_sha512_context.h
@@ -48,6 +48,8 @@ extern "C" {
 
 #endif
 
+#define LIBHMAC_SHA512_BLOCK_SIZE	128
+
 typedef struct libhmac_internal_sha512_context libhmac_internal_sha512_context_t;
 
 struct libhmac_internal_sha512_context
@@ -81,7 +83,7 @@ struct libhmac_internal_sha512_context
 
 	/* The (data) block
 	 */
-	uint8_t block[ 128 ];
+	uint8_t block[ 2 * LIBHMAC_SHA512_BLOCK_SIZE ];
 
 #endif /* defined( HAVE_LIBCRYPTO ) && defined( HAVE_OPENSSL_SHA_H ) && defined( SHA512_DIGEST_LENGTH ) */
 };
diff --git a/manuals/libhmac.3 b/manuals/libhmac.3
index b510262..a181886 100644
--- a/manuals/libhmac.3
+++ b/manuals/libhmac.3
@@ -1,4 +1,4 @@
-.Dd February  5, 2023
+.Dd April  7, 2023
 .Dt libhmac 3
 .Os libhmac
 .Sh NAME
@@ -55,7 +55,7 @@ SHA1 functions
 .Ft int
 .Fn libhmac_sha1_calculate_hmac "const uint8_t *key" "size_t key_size" "const uint8_t *buffer" "size_t size" "uint8_t *hmac" "size_t hmac_size" "libhmac_error_t **error"
 .Pp
-SHA-224 functions
+SHA-224 context functions
 .Ft int
 .Fn libhmac_sha224_context_initialize "libhmac_sha224_context_t **context" "libhmac_error_t **error"
 .Ft int
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..1ded777
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,2 @@
+[metadata]
+license_files = COPYING COPYING.LESSER
diff --git a/tests/test_md5sum.sh b/tests/test_md5sum.sh
index d4012cf..0e295f3 100755
--- a/tests/test_md5sum.sh
+++ b/tests/test_md5sum.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 # Sum tool testing script
 #
-# Version: 20200821
+# Version: 20230408
 
 EXIT_SUCCESS=0;
 EXIT_FAILURE=1;
@@ -21,7 +21,7 @@ test_callback()
 	shift 5;
 	local ARGUMENTS=("$@");
 
-	run_test_with_input_and_arguments "${TEST_EXECUTABLE}" "-d md5" "${INPUT_FILE}" > ${TMPDIR}/hmacsum;
+	run_test_with_input_and_arguments "${TEST_EXECUTABLE}" "${INPUT_FILE}" -dmd5 > ${TMPDIR}/hmacsum;
 	local RESULT=$?;
 
 	# Note that the $'' string notation is needed for Mac OS to correctly interpret the tabs.
@@ -35,7 +35,7 @@ test_callback()
 		else
 			VERIFICATION_DIGEST_HASH=`md5sum ${INPUT_FILE} | sed 's/[ ][ ]*[^ ][^ ]*$//'`;
 		fi
-		if test ${DIGEST_HASH} != ${VERIFICATION_DIGEST_HASH};
+		if test "${DIGEST_HASH}" != "${VERIFICATION_DIGEST_HASH}";
 		then
 			RESULT=${EXIT_FAILURE};
 		fi
diff --git a/tests/test_sha1sum.sh b/tests/test_sha1sum.sh
index cec8ab3..7e41a41 100755
--- a/tests/test_sha1sum.sh
+++ b/tests/test_sha1sum.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 # Sum tool testing script
 #
-# Version: 20200821
+# Version: 20230408
 
 EXIT_SUCCESS=0;
 EXIT_FAILURE=1;
@@ -21,11 +21,13 @@ test_callback()
 	shift 5;
 	local ARGUMENTS=("$@");
 
-	run_test_with_input_and_arguments "${TEST_EXECUTABLE}" "-d sha1" "${INPUT_FILE}" > ${TMPDIR}/hmacsum;
+	run_test_with_input_and_arguments "${TEST_EXECUTABLE}" "${INPUT_FILE}" -dsha1 > ${TMPDIR}/hmacsum;
 	local RESULT=$?;
 
 	DIGEST_HASH=`cat ${TMPDIR}/hmacsum | grep "SHA1" | sed 's/^[^:]*[:][\t][\t]*//'`;
 
+	cp ${TMPDIR}/hmacsum /tmp/
+
 	if test ${RESULT} -eq ${EXIT_SUCCESS};
 	then
 		if test "${PLATFORM}" = "Darwin";
@@ -34,7 +36,7 @@ test_callback()
 		else
 			VERIFICATION_DIGEST_HASH=`sha1sum ${INPUT_FILE} | sed 's/[ ][ ]*[^ ][^ ]*$//'`;
 		fi
-		if test ${DIGEST_HASH} != ${VERIFICATION_DIGEST_HASH};
+		if test "${DIGEST_HASH}" != "${VERIFICATION_DIGEST_HASH}";
 		then
 			RESULT=${EXIT_FAILURE};
 		fi
diff --git a/tests/test_sha2sum.sh b/tests/test_sha2sum.sh
index aea0691..9544230 100755
--- a/tests/test_sha2sum.sh
+++ b/tests/test_sha2sum.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 # Sum tool testing script
 #
-# Version: 20200821
+# Version: 20230408
 
 EXIT_SUCCESS=0;
 EXIT_FAILURE=1;
@@ -21,7 +21,7 @@ test_callback()
 	shift 5;
 	local ARGUMENTS=("$@");
 
-	run_test_with_input_and_arguments "${TEST_EXECUTABLE}" "-d sha224,sha256,sha512" "${INPUT_FILE}" > ${TMPDIR}/hmacsum;
+	run_test_with_input_and_arguments "${TEST_EXECUTABLE}" "${INPUT_FILE}" -dsha224,sha256,sha512 > ${TMPDIR}/hmacsum;
 	local RESULT=$?;
 
 	DIGEST_HASH=`cat ${TMPDIR}/hmacsum | grep "SHA224" | sed 's/^[^:]*[:][\t][\t]*//'`;
@@ -34,7 +34,7 @@ test_callback()
 		else
 			VERIFICATION_DIGEST_HASH=`sha224sum ${INPUT_FILE} | sed 's/[ ][ ]*[^ ][^ ]*$//'`;
 		fi
-		if test ${DIGEST_HASH} != ${VERIFICATION_DIGEST_HASH};
+		if test "${DIGEST_HASH}" != "${VERIFICATION_DIGEST_HASH}";
 		then
 			RESULT=${EXIT_FAILURE};
 		fi
@@ -50,7 +50,7 @@ test_callback()
 		else
 			VERIFICATION_DIGEST_HASH=`sha256sum ${INPUT_FILE} | sed 's/[ ][ ]*[^ ][^ ]*$//'`;
 		fi
-		if test ${DIGEST_HASH} != ${VERIFICATION_DIGEST_HASH};
+		if test "${DIGEST_HASH}" != "${VERIFICATION_DIGEST_HASH}";
 		then
 			RESULT=${EXIT_FAILURE};
 		fi
@@ -66,7 +66,7 @@ test_callback()
 		else
 			VERIFICATION_DIGEST_HASH=`sha512sum ${INPUT_FILE} | sed 's/[ ][ ]*[^ ][^ ]*$//'`;
 		fi
-		if test ${DIGEST_HASH} != ${VERIFICATION_DIGEST_HASH};
+		if test "${DIGEST_HASH}" != "${VERIFICATION_DIGEST_HASH}";
 		then
 			RESULT=${EXIT_FAILURE};
 		fi
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..df530a0
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,15 @@
+[tox]
+envlist = py3{7,8,9,10,11}
+
+[testenv]
+usedevelop = True
+allowlist_externals = ./setup.py
+pip_pre = True
+passenv =
+    CFLAGS
+    CPPFLAGS
+    INCLUDE
+    LDFLAGS
+    LIB
+commands =
+    ./setup.py bdist_wheel