1 files changed, 14 insertions, 0 deletions
diff --git a/src/crypto/keccak.h b/src/crypto/keccak.h
index fb9d8bd04..9123c7a3b 100644
--- a/src/crypto/keccak.h
+++ b/src/crypto/keccak.h
@@ -15,6 +15,17 @@
 #define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y))))
 #endif
 
+// SHA3 Algorithm context.
+typedef struct KECCAK_CTX
+{
+  // 1600 bits algorithm hashing state
+  uint64_t hash[25];
+  // 1088-bit buffer for leftovers, block size = 136 B for 256-bit keccak
+  uint64_t message[17];
+  // count of bytes in the message[] buffer
+  size_t rest;
+} KECCAK_CTX;
+
 // compute a keccak hash (md) of given byte length from "in"
 void keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen);
 
@@ -23,4 +34,7 @@ void keccakf(uint64_t st[25], int norounds);
 
 void keccak1600(const uint8_t *in, size_t inlen, uint8_t *md);
 
+void keccak_init(KECCAK_CTX * ctx);
+void keccak_update(KECCAK_CTX * ctx, const uint8_t *in, size_t inlen);
+void keccak_finish(KECCAK_CTX * ctx, uint8_t *md);
 #endif