sha3.c: full turboshake{128,256} tests

1 files changed, 254 insertions, 19 deletions

diff --git a/sha3.c b/sha3.c
index 07f1c82..1572cc5 100644
--- a/sha3.c
+++ b/sha3.c
@@ -25,7 +25,7 @@
  * - TupleHash256 and TupleHash256-XOF
  * - ParallelHash128 and ParallelHash128-XOF
  * - ParallelHash256 and ParallelHash256-XOF
- * - TurboHash128 and TurboHash256 (incomplete)
+ * - TurboHash128 and TurboHash256
  */
 
 #include <stdbool.h> // true, false
@@ -1695,11 +1695,8 @@ void parallelhash256_xof_once(const parallelhash_params_t params, const uint8_t
 // default turboshake pad byte (can be customized for domain separation)
 #define TURBOSHAKE_PAD 0x1f
 
-typedef struct {
-  sha3_xof_t xof;
-  uint8_t pad;
-} turboshake_t;
-
+// init turboeshake context with given pad byte.  returns false if the
+// pad byte is out of range.
 static inline _Bool turboshake_init(turboshake_t * const ts, const uint8_t pad) {
   // check for valid pad
   if (!pad || pad > 0x1f) {
@@ -1715,14 +1712,18 @@ static inline _Bool turboshake_init(turboshake_t * const ts, const uint8_t pad)
   return true;
 }
 
+// init turboeshake128 context with custom pad byte.  returns false if the
+// pad byte is out of range.
 _Bool turboshake128_init_custom(turboshake_t * const ts, const uint8_t pad) {
   return turboshake_init(ts, pad);
 }
 
+// init turboeshake128 context.
 void turboshake128_init(turboshake_t * const ts) {
   (void) turboshake_init(ts, TURBOSHAKE_PAD);
 }
 
+// absorb bytes into turboshake128 context.
 _Bool turboshake128_absorb(turboshake_t * const ts, const uint8_t * const m, const size_t len) {
   return xof_absorb(&(ts->xof), SHAKE128_XOF_RATE, TURBOSHAKE_NUM_ROUNDS, m, len);
 }
@@ -5951,34 +5952,127 @@ static void test_hmac_sha3_512_ctx(void) {
 }
 
 static void test_turboshake128(void) {
-  // FIXME: these tests do not work at the moment; going to revisit
-  // turboshake later
-  return; // currently disabled
+  // test pattern
+  // src: https://www.ietf.org/archive/id/draft-irtf-cfrg-kangarootwelve-10.html#name-test-vectors
+  static const uint8_t PATTERN[] = {
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
+    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
+    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
+    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
+    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
+    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
+    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
+    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
+    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
+    0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
+    0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
+    0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
+    0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
+    0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
+    0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA,
+  };
+
   static const struct {
     const char *name; // test name
     const uint8_t pad; // padding byte (domain separator)
-    const uint8_t msg[256]; // input data
-    const size_t len; // message length, in bytes
+    const size_t len; // message length, in bytes (data itself comes from PATTERN)
     const uint8_t exp[32]; // expected hash
   } tests[] = {{
-    // src: https://www.ietf.org/archive/id/draft-irtf-cfrg-kangarootwelve-10.html#name-test-vectors
-    .name = "empty",
+    .name = "len=0, d=7",
     .pad = 0x07,
-    .msg = { 0
-    },
     .len = 0,
     .exp = {
       0x5A, 0x22, 0x3A, 0xD3, 0x0B, 0x3B, 0x8C, 0x66, 0xA2, 0x43, 0x04, 0x8C, 0xFC, 0xED, 0x43, 0x0F,
       0x54, 0xE7, 0x52, 0x92, 0x87, 0xD1, 0x51, 0x50, 0xB9, 0x73, 0x13, 0x3A, 0xDF, 0xAC, 0x6A, 0x2F,
     },
+  }, {
+    .name = "len=1, d=7",
+    .pad = 0x07,
+    .len = 1,
+    .exp = {
+      0x1A, 0xC2, 0xD4, 0x50, 0xFC, 0x3B, 0x42, 0x05, 0xD1, 0x9D, 0xA7, 0xBF, 0xCA, 0x1B, 0x37, 0x51,
+      0x3C, 0x08, 0x03, 0x57, 0x7A, 0xC7, 0x16, 0x7F, 0x06, 0xFE, 0x2C, 0xE1, 0xF0, 0xEF, 0x39, 0xE5,
+    },
+  }, {
+    .name = "len=17, d=7",
+    .pad = 0x07,
+    .len = 17,
+    .exp = {
+      0xAC, 0xBD, 0x4A, 0xA5, 0x75, 0x07, 0x04, 0x3B, 0xCE, 0xE5, 0x5A, 0xD3, 0xF4, 0x85, 0x04, 0xD8,
+      0x15, 0xE7, 0x07, 0xFE, 0x82, 0xEE, 0x3D, 0xAD, 0x6D, 0x58, 0x52, 0xC8, 0x92, 0x0B, 0x90, 0x5E,
+    },
+  }, {
+    .name = "len=17**2, d=7",
+    .pad = 0x07,
+    .len = 17*17,
+    .exp = {
+      0x7A, 0x4D, 0xE8, 0xB1, 0xD9, 0x27, 0xA6, 0x82, 0xB9, 0x29, 0x61, 0x01, 0x03, 0xF0, 0xE9, 0x64,
+      0x55, 0x9B, 0xD7, 0x45, 0x42, 0xCF, 0xAD, 0x74, 0x0E, 0xE3, 0xD9, 0xB0, 0x36, 0x46, 0x9E, 0x0A,
+    },
+  }, {
+    .name = "len=17**3, d=7",
+    .pad = 0x07,
+    .len = 17*17*17,
+    .exp = {
+      0x74, 0x52, 0xED, 0x0E, 0xD8, 0x60, 0xAA, 0x8F, 0xE8, 0xE7, 0x96, 0x99, 0xEC, 0xE3, 0x24, 0xF8,
+      0xD9, 0x32, 0x71, 0x46, 0x36, 0x10, 0xDA, 0x76, 0x80, 0x1E, 0xBC, 0xEE, 0x4F, 0xCA, 0xFE, 0x42,
+    },
+  }, {
+    .name = "len=17**4, d=7",
+    .pad = 0x07,
+    .len = 17*17*17*17,
+    .exp = {
+      0xCA, 0x5F, 0x1F, 0x3E, 0xEA, 0xC9, 0x92, 0xCD, 0xC2, 0xAB, 0xEB, 0xCA, 0x0E, 0x21, 0x67, 0x65,
+      0xDB, 0xF7, 0x79, 0xC3, 0xC1, 0x09, 0x46, 0x05, 0x5A, 0x94, 0xAB, 0x32, 0x72, 0x57, 0x35, 0x22,
+    },
+  }, {
+    .name = "len=17**5, d=7",
+    .pad = 0x07,
+    .len = 17*17*17*17*17,
+    .exp = {
+      0xE9, 0x88, 0x19, 0x3F, 0xB9, 0x11, 0x9F, 0x11, 0xCD, 0x34, 0x46, 0x79, 0x14, 0xE2, 0xA2, 0x6D,
+      0xA9, 0xBD, 0xF9, 0x6C, 0x8B, 0xEF, 0x07, 0x6A, 0xEE, 0xAD, 0x1A, 0x89, 0x7B, 0x86, 0x63, 0x83,
+    },
+  }, {
+    .name = "len=17**6, d=7",
+    .pad = 0x07,
+    .len = 17*17*17*17*17*17,
+    .exp = {
+      0x9C, 0x0F, 0xFB, 0x98, 0x7E, 0xEE, 0xED, 0xAD, 0xFA, 0x55, 0x94, 0x89, 0x87, 0x75, 0x6D, 0x09,
+      0x0B, 0x67, 0xCC, 0xB6, 0x12, 0x36, 0xE3, 0x06, 0xAC, 0x8A, 0x24, 0xDE, 0x1D, 0x0A, 0xF7, 0x74,
+    },
+  }, {
+    .name = "len=0, d=6",
+    .pad = 0x06,
+    .len = 0,
+    .exp = {
+      0xC7, 0x90, 0x29, 0x30, 0x6B, 0xFA, 0x2F, 0x17, 0x83, 0x6A, 0x3D, 0x65, 0x16, 0xD5, 0x56, 0x63,
+      0x40, 0xFE, 0xA6, 0xEB, 0x1A, 0x11, 0x39, 0xAD, 0x90, 0x0B, 0x41, 0x24, 0x3C, 0x49, 0x4B, 0x37,
+    },
+  }, {
+    .name = "len=0, d=B",
+    .pad = 0x0B,
+    .len = 0,
+    .exp = {
+      0x8B, 0x03, 0x5A, 0xB8, 0xF8, 0xEA, 0x7B, 0x41, 0x02, 0x17, 0x16, 0x74, 0x58, 0x33, 0x2E, 0x46,
+      0xF5, 0x4B, 0xE4, 0xFF, 0x83, 0x54, 0xBA, 0xF3, 0x68, 0x71, 0x04, 0xA6, 0xD2, 0x4B, 0x0E, 0xAB,
+    },
   }};
 
   for (size_t i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
-    // run
-    uint8_t got[32];
+    // init
     turboshake_t ts;
     turboshake128_init_custom(&ts, tests[i].pad);
-    turboshake128_absorb(&ts, tests[i].msg, tests[i].len);
+
+    // absorb
+    for (size_t ofs = 0; ofs < tests[i].len; ofs += sizeof(PATTERN)) {
+      const size_t len = MIN(tests[i].len - ofs, sizeof(PATTERN));
+      turboshake128_absorb(&ts, PATTERN, len);
+    }
+
+    // squeeze
+    uint8_t got[32];
     turboshake128_squeeze(&ts, got, sizeof(got));
 
     // check
@@ -5993,7 +6087,148 @@ static void test_turboshake128(void) {
 }
 
 static void test_turboshake256(void) {
-  // TODO
+  // test pattern
+  // src: https://www.ietf.org/archive/id/draft-irtf-cfrg-kangarootwelve-10.html#name-test-vectors
+  static const uint8_t PATTERN[] = {
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
+    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
+    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
+    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
+    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
+    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
+    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
+    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
+    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
+    0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
+    0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
+    0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
+    0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
+    0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
+    0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA,
+  };
+
+  static const struct {
+    const char *name; // test name
+    const uint8_t pad; // padding byte (domain separator)
+    const size_t len; // message length, in bytes (data itself comes from PATTERN)
+    const uint8_t exp[64]; // expected hash
+  } tests[] = {{
+    .name = "len=0, d=7",
+    .pad = 0x07,
+    .len = 0,
+    .exp = {
+      0x4A, 0x55, 0x5B, 0x06, 0xEC, 0xF8, 0xF1, 0x53, 0x8C, 0xCF, 0x5C, 0x95, 0x15, 0xD0, 0xD0, 0x49,
+      0x70, 0x18, 0x15, 0x63, 0xA6, 0x23, 0x81, 0xC7, 0xF0, 0xC8, 0x07, 0xA6, 0xD1, 0xBD, 0x9E, 0x81,
+      0x97, 0x80, 0x4B, 0xFD, 0xE2, 0x42, 0x8B, 0xF7, 0x29, 0x61, 0xEB, 0x52, 0xB4, 0x18, 0x9C, 0x39,
+      0x1C, 0xEF, 0x6F, 0xEE, 0x66, 0x3A, 0x3C, 0x1C, 0xE7, 0x8B, 0x88, 0x25, 0x5B, 0xC1, 0xAC, 0xC3,
+    },
+  }, {
+    .name = "len=17, d=7",
+    .pad = 0x07,
+    .len = 17,
+    .exp = {
+      0x66, 0xD3, 0x78, 0xDF, 0xE4, 0xE9, 0x02, 0xAC, 0x4E, 0xB7, 0x8F, 0x7C, 0x2E, 0x5A, 0x14, 0xF0,
+      0x2B, 0xC1, 0xC8, 0x49, 0xE6, 0x21, 0xBA, 0xE6, 0x65, 0x79, 0x6F, 0xB3, 0x34, 0x6E, 0x6C, 0x79,
+      0x75, 0x70, 0x5B, 0xB9, 0x3C, 0x00, 0xF3, 0xCA, 0x8F, 0x83, 0xBC, 0xA4, 0x79, 0xF0, 0x69, 0x77,
+      0xAB, 0x3A, 0x60, 0xF3, 0x97, 0x96, 0xB1, 0x36, 0x53, 0x8A, 0xAA, 0xE8, 0xBC, 0xAC, 0x85, 0x44,
+    },
+  }, {
+    .name = "len=17**2, d=7",
+    .pad = 0x07,
+    .len = 17*17,
+    .exp = {
+      0xC5, 0x21, 0x74, 0xAB, 0xF2, 0x82, 0x95, 0xE1, 0x5D, 0xFB, 0x37, 0xB9, 0x46, 0xAC, 0x36, 0xBD,
+      0x3A, 0x6B, 0xCC, 0x98, 0xC0, 0x74, 0xFC, 0x25, 0x19, 0x9E, 0x05, 0x30, 0x42, 0x5C, 0xC5, 0xED,
+      0xD4, 0xDF, 0xD4, 0x3D, 0xC3, 0xE7, 0xE6, 0x49, 0x1A, 0x13, 0x17, 0x98, 0x30, 0xC3, 0xC7, 0x50,
+      0xC9, 0x23, 0x7E, 0x83, 0xFD, 0x9A, 0x3F, 0xEC, 0x46, 0x03, 0xFF, 0x57, 0xE4, 0x22, 0x2E, 0xF2,
+    },
+  }, {
+    .name = "len=17**3, d=7",
+    .pad = 0x07,
+    .len = 17*17*17,
+    .exp = {
+      0x62, 0xA5, 0xA0, 0xBF, 0xF0, 0x64, 0x26, 0xD7, 0x1A, 0x7A, 0x3E, 0x9E, 0x3F, 0x2F, 0xD6, 0xE2,
+      0x52, 0xFF, 0x3F, 0xC1, 0x88, 0xA6, 0xA5, 0x36, 0xEC, 0xA4, 0x5A, 0x49, 0xA3, 0x43, 0x7C, 0xB3,
+      0xBC, 0x3A, 0x0F, 0x81, 0x49, 0xC8, 0x50, 0xE6, 0xE7, 0xF4, 0x74, 0x7A, 0x70, 0x62, 0x7F, 0xD2,
+      0x30, 0x30, 0x41, 0xC6, 0xC3, 0x36, 0x30, 0xF9, 0x43, 0xAD, 0x92, 0xF8, 0xE1, 0xFF, 0x43, 0x90,
+    },
+  }, {
+    .name = "len=17**4, d=7",
+    .pad = 0x07,
+    .len = 17*17*17*17,
+    .exp = {
+      0x52, 0x3C, 0x06, 0x47, 0x18, 0x2D, 0x89, 0x41, 0xF0, 0xDD, 0x5C, 0x5C, 0x0A, 0xB6, 0x2D, 0x4F,
+      0xC2, 0x95, 0x61, 0x61, 0x53, 0x96, 0xBB, 0x5B, 0x9A, 0x9D, 0xEB, 0x02, 0x2B, 0x80, 0xC5, 0xBF,
+      0x2D, 0x83, 0xA3, 0xBB, 0x36, 0xFF, 0xC0, 0x4F, 0xAC, 0x58, 0xCF, 0x11, 0x49, 0xC6, 0x6D, 0xEC,
+      0x4A, 0x59, 0x52, 0x6E, 0x51, 0xF2, 0x95, 0x96, 0xD8, 0x24, 0x42, 0x1A, 0x4B, 0x84, 0xB4, 0x4D,
+    },
+  }, {
+    .name = "len=17**5, d=7",
+    .pad = 0x07,
+    .len = 17*17*17*17*17,
+    .exp = {
+      0xD1, 0x14, 0xA1, 0xC1, 0xA2, 0x08, 0xFF, 0x05, 0xFD, 0x49, 0xD0, 0x9E, 0xE0, 0x35, 0x46, 0x5D,
+      0x86, 0x54, 0x7E, 0xBA, 0xD8, 0xE9, 0xAF, 0x4F, 0x8E, 0x87, 0x53, 0x70, 0x57, 0x3D, 0x6B, 0x7B,
+      0xB2, 0x0A, 0xB9, 0x60, 0x63, 0x5A, 0xB5, 0x74, 0xE2, 0x21, 0x95, 0xEF, 0x9D, 0x17, 0x1C, 0x9A,
+      0x28, 0x01, 0x04, 0x4B, 0x6E, 0x2E, 0xDF, 0x27, 0x2E, 0x23, 0x02, 0x55, 0x4B, 0x3A, 0x77, 0xC9,
+    },
+  }, {
+    .name = "len=17**6, d=7",
+    .pad = 0x07,
+    .len = 17*17*17*17*17*17,
+    .exp = {
+      0x1E, 0x51, 0x34, 0x95, 0xD6, 0x16, 0x98, 0x75, 0xB5, 0x94, 0x53, 0xA5, 0x94, 0xE0, 0x8A, 0xE2,
+      0x71, 0xCA, 0x20, 0xE0, 0x56, 0x43, 0xC8, 0x8A, 0x98, 0x7B, 0x5B, 0x6A, 0xB4, 0x23, 0xED, 0xE7,
+      0x24, 0x0F, 0x34, 0xF2, 0xB3, 0x35, 0xFA, 0x94, 0xBC, 0x4B, 0x0D, 0x70, 0xE3, 0x1F, 0xB6, 0x33,
+      0xB0, 0x79, 0x84, 0x43, 0x31, 0xFE, 0xA4, 0x2A, 0x9C, 0x4D, 0x79, 0xBB, 0x8C, 0x5F, 0x9E, 0x73,
+    },
+  }, {
+    .name = "len=0, d=B",
+    .pad = 0x0B,
+    .len = 0,
+    .exp = {
+      0xC7, 0x49, 0xF7, 0xFB, 0x23, 0x64, 0x4A, 0x02, 0x1D, 0x35, 0x65, 0x3D, 0x1B, 0xFD, 0xF7, 0x47,
+      0xCE, 0xCE, 0x5F, 0x97, 0x39, 0xF9, 0xA3, 0x44, 0xAD, 0x16, 0x9F, 0x10, 0x90, 0x6C, 0x68, 0x17,
+      0xC8, 0xEE, 0x12, 0x78, 0x4E, 0x42, 0xFF, 0x57, 0x81, 0x4E, 0xFC, 0x1C, 0x89, 0x87, 0x89, 0xD5,
+      0xE4, 0x15, 0xDB, 0x49, 0x05, 0x2E, 0xA4, 0x3A, 0x09, 0x90, 0x1D, 0x7A, 0x82, 0xA2, 0x14, 0x5C,
+    },
+  }, {
+    .name = "len=0, d=6",
+    .pad = 0x06,
+    .len = 0,
+    .exp = {
+      0xFF, 0x23, 0xDC, 0xCD, 0x62, 0x16, 0x8F, 0x5A, 0x44, 0x46, 0x52, 0x49, 0xA8, 0x6D, 0xC1, 0x0E,
+      0x8A, 0xAB, 0x4B, 0xD2, 0x6A, 0x22, 0xDE, 0xBF, 0x23, 0x48, 0x02, 0x0A, 0x83, 0x1C, 0xDB, 0xE1,
+      0x2C, 0xDD, 0x36, 0xA7, 0xDD, 0xD3, 0x1E, 0x71, 0xC0, 0x1F, 0x7C, 0x97, 0xA0, 0xD4, 0xC3, 0xA0,
+      0xCC, 0x1B, 0x21, 0x21, 0xE6, 0xB7, 0xCE, 0xAB, 0x38, 0x87, 0xA4, 0xC9, 0xA5, 0xAF, 0x8B, 0x03,
+    },
+  }};
+
+  for (size_t i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
+    // init
+    turboshake_t ts;
+    turboshake256_init_custom(&ts, tests[i].pad);
+
+    // absorb
+    for (size_t ofs = 0; ofs < tests[i].len; ofs += sizeof(PATTERN)) {
+      const size_t len = MIN(tests[i].len - ofs, sizeof(PATTERN));
+      turboshake256_absorb(&ts, PATTERN, len);
+    }
+
+    // squeeze
+    uint8_t got[64];
+    turboshake256_squeeze(&ts, got, sizeof(got));
+
+    // check
+    if (memcmp(got, tests[i].exp, sizeof(got))) {
+      fprintf(stderr, "test_turboshake256(\"%s\") failed, got:\n", tests[i].name);
+      dump_hex(stderr, got, sizeof(got));
+
+      fprintf(stderr, "exp:\n");
+      dump_hex(stderr, tests[i].exp, sizeof(got));
+    }
+  }
 }
 
 int main(void) {