1 files changed, 56 insertions, 0 deletions
diff --git a/lib/blake2/include/blake2s.h b/lib/blake2/include/blake2s.h
new file mode 100644
index 0000000..ede170c
--- /dev/null
+++ b/lib/blake2/include/blake2s.h
@@ -0,0 +1,56 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+struct BLAKE2s_param {
+  uint8_t outlen; /* digest length */
+  uint8_t keylen; /* key length */
+  uint8_t fanout;
+  uint8_t depth;
+  uint32_t leaf_length;
+  uint32_t node_offset;
+  uint16_t node_offset_ex;
+  uint8_t node_depth;
+  uint8_t inner_length;
+  uint64_t salt;
+  uint64_t personalization;
+};
+
+struct BLAKE2s_ctx {
+  uint8_t b[64];              /* input buffer */
+  size_t c;                   /* pointer for b[] */
+  uint32_t h[8];              /* chained state vector h */
+  uint32_t t[2];              /* total number of bytes */
+  struct BLAKE2s_param param; /* parameter block */
+};
+
+/**
+ * 3.1 Mixing Function G
+ */
+void G(uint32_t V[16], unsigned a, unsigned b, unsigned c, unsigned d, uint32_t x, uint32_t y);
+
+/**
+ * 3.2 Compression Function F
+ * @param t: 2w-bit offset counter t
+ * @param f: final block indicator flag f
+ */
+void F(struct BLAKE2s_ctx *context, uint32_t m[16], uint32_t f);
+
+int BLAKE2s_init(struct BLAKE2s_ctx *ctx, uint8_t outlen, const void *key, uint8_t keylen);
+void BLAKE2s_update(struct BLAKE2s_ctx *ctx, const void *d, size_t dd);
+void BLAKE2s_final(struct BLAKE2s_ctx *ctx, void *out);
+
+/* All-in-one convenience function. */
+static __inline__ int
+BLAKE2s(void *out, uint8_t outlen,       /* return buffer for digest */
+        const void *key, uint8_t keylen, /* optional secret key */
+        const void *in, size_t inlen)    /* data to be hashed */
+{
+  struct BLAKE2s_ctx ctx;
+  if (BLAKE2s_init(&ctx, outlen, key, keylen)) return -1;
+  BLAKE2s_update(&ctx, in, inlen);
+  BLAKE2s_final(&ctx, out);
+
+  return 0;
+}