Merge pull request #5167 from tom-cosgrove-arm/fix-builds-with-only-mbedtls_bignum_c-defined
Backport 2.x: Fix builds when config.h only defines MBEDTLS_BIGNUM_C
diff --git a/ChangeLog.d/build-without-sha.txt b/ChangeLog.d/build-without-sha.txt
new file mode 100644
index 0000000..78ba276
--- /dev/null
+++ b/ChangeLog.d/build-without-sha.txt
@@ -0,0 +1,3 @@
+Bugfix
+ * Fix the build when no SHA2 module is included. Fixes #4930.
+ * Fix the build when only the bignum module is included. Fixes #4929.
diff --git a/include/mbedtls/entropy.h b/include/mbedtls/entropy.h
index d6ad8e7..deb3c50 100644
--- a/include/mbedtls/entropy.h
+++ b/include/mbedtls/entropy.h
@@ -130,7 +130,7 @@
* -1 after free. */
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
mbedtls_sha512_context accumulator;
-#else
+#elif defined(MBEDTLS_ENTROPY_SHA256_ACCUMULATOR)
mbedtls_sha256_context accumulator;
#endif
int source_count; /* Number of entries used in source. */
diff --git a/library/bignum.c b/library/bignum.c
index b147a54..62e7f76 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -43,6 +43,7 @@
#include "mbedtls/error.h"
#include "constant_time_internal.h"
+#include <limits.h>
#include <string.h>
#if defined(MBEDTLS_PLATFORM_C)
diff --git a/programs/fuzz/common.c b/programs/fuzz/common.c
index ac39ee2..e12ee3b 100644
--- a/programs/fuzz/common.c
+++ b/programs/fuzz/common.c
@@ -1,4 +1,5 @@
#include "common.h"
+#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>