1 files changed, 73 insertions, 0 deletions
diff --git a/lib/sha256.h b/lib/sha256.h
new file mode 100644
index 00000000..381200a9
--- /dev/null
+++ b/lib/sha256.h
@@ -0,0 +1,73 @@
+/*
+ *	BIRD Library -- SHA-256 and SHA-224 Hash Functions,
+ *			HMAC-SHA-256 and HMAC-SHA-224 Functions
+ *
+ *	(c) 2015 CZ.NIC z.s.p.o.
+ *
+ *	Based on the code from libgcrypt-1.6.0, which is
+ *	(c) 2003, 2006, 2008, 2009 Free Software Foundation, Inc.
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#ifndef _BIRD_SHA256_H_
+#define _BIRD_SHA256_H_
+
+#include "nest/bird.h"
+
+
+#define SHA224_SIZE 		28
+#define SHA224_HEX_SIZE		57
+#define SHA224_BLOCK_SIZE 	64
+
+#define SHA256_SIZE 		32
+#define SHA256_HEX_SIZE		65
+#define SHA256_BLOCK_SIZE 	64
+
+
+struct sha256_context {
+  u32  h0, h1, h2, h3, h4, h5, h6, h7;
+  byte buf[SHA256_BLOCK_SIZE];
+  uint nblocks;
+  uint count;
+};
+
+#define sha224_context sha256_context
+
+
+void sha256_init(struct sha256_context *ctx);
+void sha224_init(struct sha224_context *ctx);
+
+void sha256_update(struct sha256_context *ctx, const byte *buf, size_t len);
+static inline void sha224_update(struct sha224_context *ctx, const byte *buf, size_t len)
+{ sha256_update(ctx, buf, len); }
+
+byte *sha256_final(struct sha256_context *ctx);
+static inline byte *sha224_final(struct sha224_context *ctx)
+{ return sha256_final(ctx); }
+
+
+/*
+ *	HMAC-SHA256, HMAC-SHA224
+ */
+
+struct sha256_hmac_context
+{
+  struct sha256_context ictx;
+  struct sha256_context octx;
+};
+
+#define sha224_hmac_context sha256_hmac_context
+
+
+void sha256_hmac_init(struct sha256_hmac_context *ctx, const byte *key, size_t keylen);
+void sha224_hmac_init(struct sha224_hmac_context *ctx, const byte *key, size_t keylen);
+
+void sha256_hmac_update(struct sha256_hmac_context *ctx, const byte *buf, size_t buflen);
+void sha224_hmac_update(struct sha224_hmac_context *ctx, const byte *buf, size_t buflen);
+
+byte *sha256_hmac_final(struct sha256_hmac_context *ctx);
+byte *sha224_hmac_final(struct sha224_hmac_context *ctx);
+
+
+#endif /* _BIRD_SHA256_H_ */