Add BLAKE2s implementation

1 files changed, 97 insertions, 0 deletions

diff --git a/com/BLAKE2/test_main.c b/com/BLAKE2/test_main.c
new file mode 100644
index 0000000..80828bb
--- /dev/null
+++ b/com/BLAKE2/test_main.c
@@ -0,0 +1,97 @@
+// test_main.c
+// Self test Modules for BLAKE2b and BLAKE2s -- and a stub main().
+
+#include "blake2s.h"
+#include <stdio.h>
+
+// Deterministic sequences (Fibonacci generator).
+
+static void
+selftest_seq(uint8_t *out, size_t len, uint32_t seed)
+{
+  size_t i;
+  uint32_t t, a, b;
+
+  a = 0xDEAD4BAD * seed; // prime
+  b = 1;
+
+  for (i = 0; i < len; i++) { // fill the buf
+    t = a + b;
+    a = b;
+    b = t;
+    out[i] = (t >> 24) & 0xFF;
+  }
+}
+
+// BLAKE2s self-test validation. Return 0 when OK.
+int
+blake2s_selftest()
+{
+  // Grand hash of hash results.
+  const uint8_t blake2s_res[32] = {0x6A, 0x41, 0x1F, 0x08, 0xCE, 0x25, 0xAD, 0xCD, 0xFB, 0x02, 0xAB,
+                                   0xA6, 0x41, 0x45, 0x1C, 0xEC, 0x53, 0xC5, 0x98, 0xB2, 0x4F, 0x4F,
+                                   0xC7, 0x87, 0xFB, 0xDC, 0x88, 0x79, 0x7F, 0x4C, 0x1D, 0xFE};
+  // Parameter sets.
+  const size_t b2s_md_len[4] = {16, 20, 28, 32};
+  const size_t b2s_in_len[6] = {0, 3, 64, 65, 255, 1024};
+
+  size_t i, j, outlen, inlen;
+  uint8_t in[1024], md[32], key[32];
+  struct BLAKE2s_ctx ctx;
+
+  // 256-bit hash for testing.
+  if (BLAKE2s_init(&ctx, 32, NULL, 0)) return -1;
+
+  for (i = 0; i < 4; i++) {
+    outlen = b2s_md_len[i];
+    for (j = 0; j < 6; j++) {
+      inlen = b2s_in_len[j];
+
+      selftest_seq(in, inlen, inlen); // unkeyed hash
+      BLAKE2s(md, outlen, NULL, 0, in, inlen);
+      BLAKE2s_update(&ctx, md, outlen); // hash the hash
+
+      selftest_seq(key, outlen, outlen); // keyed hash
+      BLAKE2s(md, outlen, key, outlen, in, inlen);
+      BLAKE2s_update(&ctx, md, outlen); // hash the hash
+    }
+  }
+
+  // Compute and compare the hash of hashes.
+  BLAKE2s_final(&ctx, md);
+  for (i = 0; i < 32; i++) {
+    if (md[i] != blake2s_res[i]) return -1;
+  }
+
+  return 0;
+}
+
+// Test driver.
+int
+main(void)
+{
+  const int good = blake2s_selftest();
+  printf("blake2s_selftest() = %s\n", good ? "FAIL" : "OK");
+
+  char *in = "abc";
+  size_t inlen = 3;
+
+  uint8_t out[32];
+  BLAKE2s(out, 32, NULL, 0, in, inlen);
+
+  const uint8_t blake2s_res[32] = {0x50, 0x8C, 0x5E, 0x8C, 0x32, 0x7C, 0x14, 0xE2, 0xE1, 0xA7, 0x2B,
+                                   0xA3, 0x4E, 0xEB, 0x45, 0x2F, 0x37, 0x45, 0x8B, 0x20, 0x9E, 0xD6,
+                                   0x3A, 0x29, 0x4D, 0x99, 0x9B, 0x4C, 0x86, 0x67, 0x59, 0x82};
+
+  for (unsigned i = 0; i < 32; i++) {
+    if (out[i] != blake2s_res[i]) {
+      printf("digest failed");
+      printf("\nout: ");
+      for (unsigned n = 0; n < 32; ++n) printf(" %02x", out[n]);
+      printf("\nres: ");
+      for (unsigned n = 0; n < 32; ++n) printf(" %02x", blake2s_res[n]);
+      return -1;
+    }
+  }
+  return good;
+}