bpo-47098: Replace Keccak Code Package with tiny_sha3 (GH-32060)

1 files changed, 49 insertions, 0 deletions

diff --git a/Modules/_sha3/sha3.h b/Modules/_sha3/sha3.h
new file mode 100644
index 0000000..f973d67
--- /dev/null
+++ b/Modules/_sha3/sha3.h
@@ -0,0 +1,49 @@
+// sha3.h
+// 19-Nov-11  Markku-Juhani O. Saarinen <mjos@iki.fi>
+
+#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.
+static void sha3_keccakf(uint64_t st[25]);
+
+// OpenSSL - like interfece
+static int sha3_init(sha3_ctx_t *c, int mdlen);    // mdlen = hash output in bytes
+static int sha3_update(sha3_ctx_t *c, const void *data, size_t len);
+static int sha3_final(void *md, sha3_ctx_t *c);    // digest goes to md
+
+// compute a sha3 hash (md) of given byte length from "in"
+#if 0
+static void *sha3(const void *in, size_t inlen, void *md, int mdlen);
+#endif
+
+// 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
+
+static void shake_xof(sha3_ctx_t *c);
+static void shake_out(sha3_ctx_t *c, void *out, size_t len);
+
+#endif
+