2 files changed, 47 insertions, 0 deletions

diff --git a/sys/crypto/sha2/sha256.h b/sys/crypto/sha2/sha256.h
index 80765ef8749d..c828379be5c9 100644
--- a/sys/crypto/sha2/sha256.h
+++ b/sys/crypto/sha2/sha256.h
@@ -40,6 +40,38 @@ typedef struct SHA256Context {
 } SHA256_CTX;
 
 __BEGIN_DECLS
+
+/* Ensure libmd symbols do not clash with libcrypto */
+
+#ifndef SHA256_Init
+#define SHA256_Init		_libmd_SHA256_Init
+#endif
+#ifndef SHA256_Update
+#define SHA256_Update		_libmd_SHA256_Update
+#endif
+#ifndef SHA256_Final
+#define SHA256_Final		_libmd_SHA256_Final
+#endif
+#ifndef SHA256_End
+#define SHA256_End		_libmd_SHA256_End
+#endif
+#ifndef SHA256_File
+#define SHA256_File		_libmd_SHA256_File
+#endif
+#ifndef SHA256_FileChunk
+#define SHA256_FileChunk	_libmd_SHA256_FileChunk
+#endif
+#ifndef SHA256_Data
+#define SHA256_Data		_libmd_SHA256_Data
+#endif
+
+#ifndef SHA256_Transform
+#define SHA256_Transform	_libmd_SHA256_Transform
+#endif
+#ifndef SHA256_version
+#define SHA256_version		_libmd_SHA256_version
+#endif
+
 void	SHA256_Init(SHA256_CTX *);
 void	SHA256_Update(SHA256_CTX *, const void *, size_t);
 void	SHA256_Final(unsigned char [32], SHA256_CTX *);
diff --git a/sys/crypto/sha2/sha256c.c b/sys/crypto/sha2/sha256c.c
index 9c666df3ee25..da9b02cbd1bf 100644
--- a/sys/crypto/sha2/sha256c.c
+++ b/sys/crypto/sha2/sha256c.c
@@ -299,3 +299,18 @@ SHA256_Final(unsigned char digest[32], SHA256_CTX * ctx)
 	/* Clear the context state */
 	memset((void *)ctx, 0, sizeof(*ctx));
 }
+
+#ifdef WEAK_REFS
+/* When building libmd, provide weak references. Note: this is not
+   activated in the context of compiling these sources for internal
+   use in libcrypt.
+ */
+#undef SHA256_Init
+__weak_reference(_libmd_SHA256_Init, SHA256_Init);
+#undef SHA256_Update
+__weak_reference(_libmd_SHA256_Update, SHA256_Update);
+#undef SHA256_Final
+__weak_reference(_libmd_SHA256_Final, SHA256_Final);
+#undef SHA256_Transform
+__weak_reference(_libmd_SHA256_Transform, SHA256_Transform);
+#endif