Add CHAP SHA3-256 support

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

include/iscsi.h

@@ -187,9 +187,7 @@ enum iscsi_chap_auth {
 	ISCSI_CHAP_MD5 = 5,
 	ISCSI_CHAP_SHA_1 = 6,
 	ISCSI_CHAP_SHA_256 = 7,
-#if 0        
 	ISCSI_CHAP_SHA3_256 = 8,
-#endif        
 };
 
 EXTERN enum iscsi_chap_auth

include/sha3.h

@@ -0,0 +1,49 @@
+// sha3.h
+// 19-Nov-11  Markku-Juhani O. Saarinen <mjos@iki.fi>
+
+// From https://github.com/mjosaarinen/tiny_sha3
+
+#ifndef SHA3_H
+#define SHA3_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifndef KECCAKF_ROUNDS
+#define KECCAKF_ROUNDS 24
+#endif
+
+#ifndef ROTL64
+#define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y))))
+#endif
+
+// state context
+typedef struct {
+    union {                                 // state:
+        uint8_t b[200];                     // 8-bit bytes
+        uint64_t q[25];                     // 64-bit words
+    } st;
+    int pt, rsiz, mdlen;                    // these don't overflow
+} sha3_ctx_t;
+
+// Compression function.
+void sha3_keccakf(uint64_t st[25]);
+
+// OpenSSL - like interfece
+int sha3_init(sha3_ctx_t *c, int mdlen);    // mdlen = hash output in bytes
+int sha3_update(sha3_ctx_t *c, const void *data, size_t len);
+int sha3_final(void *md, sha3_ctx_t *c);    // digest goes to md
+
+// compute a sha3 hash (md) of given byte length from "in"
+void *sha3(const void *in, size_t inlen, void *md, int mdlen);
+
+// SHAKE128 and SHAKE256 extensible-output functions
+#define shake128_init(c) sha3_init(c, 16)
+#define shake256_init(c) sha3_init(c, 32)
+#define shake_update sha3_update
+
+void shake_xof(sha3_ctx_t *c);
+void shake_out(sha3_ctx_t *c, void *out, size_t len);
+
+#endif
+