Add TurboSHAKE XOF functions.

TurboSHAKE128 and TurboSHAKE256.
https://datatracker.ietf.org/doc/html/rfc9861
https://www.rfc-editor.org/rfc/rfc9861.txt
https://keccak.team/files/TurboSHAKE.pdf
#691

Author: MarekKnapek

src/hashes/sha3.c

@@ -130,6 +130,9 @@ const struct ltc_hash_descriptor keccak_512_desc =
 
 #define SHA3_KECCAK_SPONGE_WORDS 25 /* 1600 bits > 200 bytes > 25 x ulong64 */
 #define SHA3_KECCAK_ROUNDS 24
+#define SHA3_KECCAK_RC_OFFSET 0
+#define SHA3_KECCAK_TURBO_ROUNDS 12
+#define SHA3_KECCAK_TURBO_RC_OFFSET 12
 
 static const ulong64 s_keccakf_rndc[24] = {
    CONST64(0x0000000000000001), CONST64(0x0000000000008082),
@@ -154,12 +157,12 @@ static const unsigned s_keccakf_piln[24] = {
    10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4, 15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1
 };
 
-static void s_keccakf(ulong64 s[25])
+static LTC_INLINE void s_keccak_f(ulong64 s[25], int max_rounds, int rc_offset)
 {
    int i, j, round;
    ulong64 t, bc[5];
 
-   for(round = 0; round < SHA3_KECCAK_ROUNDS; round++) {
+   for(round = 0; round < max_rounds; round++) {
       /* Theta */
       for(i = 0; i < 5; i++) {
          bc[i] = s[i] ^ s[i + 5] ^ s[i + 10] ^ s[i + 15] ^ s[i + 20];
@@ -188,10 +191,23 @@ static void s_keccakf(ulong64 s[25])
          }
       }
       /* Iota */
-      s[0] ^= s_keccakf_rndc[round];
+      s[0] ^= s_keccakf_rndc[rc_offset + round];
    }
 }
 
+static void s_keccakf(ulong64 s[25])
+{
+   s_keccak_f(s, SHA3_KECCAK_ROUNDS, SHA3_KECCAK_RC_OFFSET);
+}
+
+#if defined LTC_TURBO_SHAKE
+static void s_keccak_turbo_f(ulong64 s[25])
+{
+   s_keccak_f(s, SHA3_KECCAK_TURBO_ROUNDS, SHA3_KECCAK_TURBO_RC_OFFSET);
+}
+#endif
+
+
 static LTC_INLINE int ss_done(hash_state *md, unsigned char *hash, ulong64 pad)
 {
    unsigned i;
@@ -257,7 +273,8 @@ int sha3_shake_init(hash_state *md, int num)
 }
 #endif
 
-int sha3_process(hash_state *md, const unsigned char *in, unsigned long inlen)
+typedef void (*process_fn)(ulong64 s[25]);
+static LTC_INLINE int s_sha3_process(hash_state *md, const unsigned char *in, unsigned long inlen, process_fn proc_f)
 {
    /* 0...7 -- how much is needed to have a word */
    unsigned old_tail = (8 - md->sha3.byte_index) & 7;
@@ -283,7 +300,7 @@ int sha3_process(hash_state *md, const unsigned char *in, unsigned long inlen)
       md->sha3.byte_index = 0;
       md->sha3.saved = 0;
       if(++md->sha3.word_index == (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words)) {
-         s_keccakf(md->sha3.s);
+         proc_f(md->sha3.s);
          md->sha3.word_index = 0;
       }
    }
@@ -297,7 +314,7 @@ int sha3_process(hash_state *md, const unsigned char *in, unsigned long inlen)
       LOAD64L(t, in);
       md->sha3.s[md->sha3.word_index] ^= t;
       if(++md->sha3.word_index == (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words)) {
-         s_keccakf(md->sha3.s);
+         proc_f(md->sha3.s);
          md->sha3.word_index = 0;
       }
    }
@@ -309,6 +326,18 @@ int sha3_process(hash_state *md, const unsigned char *in, unsigned long inlen)
    return CRYPT_OK;
 }
 
+int sha3_process(hash_state *md, const unsigned char *in, unsigned long inlen)
+{
+   return s_sha3_process(md, in, inlen, s_keccakf);
+}
+
+#if defined LTC_TURBO_SHAKE
+int turbo_shake_process(hash_state *md, const unsigned char *in, unsigned long inlen)
+{
+   return s_sha3_process(md, in, inlen, s_keccak_turbo_f);
+}
+#endif
+
 #ifdef LTC_SHA3
 int sha3_done(hash_state *md, unsigned char *out)
 {
@@ -324,7 +353,7 @@ int keccak_done(hash_state *md, unsigned char *out)
 #endif
 
 #ifdef LTC_SHA3
-int sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen)
+static LTC_INLINE int s_sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen, process_fn proc_f)
 {
    /* IMPORTANT NOTE: sha3_shake_done can be called many times */
    unsigned long idx;
@@ -338,7 +367,7 @@ int sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen)
       /* shake_xof operation must be done only once */
       md->sha3.s[md->sha3.word_index] ^= (md->sha3.saved ^ (CONST64(0x1F) << (md->sha3.byte_index * 8)));
       md->sha3.s[SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words - 1] ^= CONST64(0x8000000000000000);
-      s_keccakf(md->sha3.s);
+      proc_f(md->sha3.s);
       /* store sha3.s[] as little-endian bytes into sha3.sb */
       for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) {
          STORE64L(md->sha3.s[i], md->sha3.sb + i * 8);
@@ -349,7 +378,7 @@ int sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen)
 
    for (idx = 0; idx < outlen; idx++) {
       if(md->sha3.byte_index >= (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words) * 8) {
-         s_keccakf(md->sha3.s);
+         proc_f(md->sha3.s);
          /* store sha3.s[] as little-endian bytes into sha3.sb */
          for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) {
             STORE64L(md->sha3.s[i], md->sha3.sb + i * 8);
@@ -361,6 +390,18 @@ int sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen)
    return CRYPT_OK;
 }
 
+int sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen)
+{
+   return s_sha3_shake_done(md, out, outlen, s_keccakf);
+}
+
+#if defined LTC_TURBO_SHAKE
+int turbo_shake_done(hash_state *md, unsigned char *out, unsigned long outlen)
+{
+   return s_sha3_shake_done(md, out, outlen, s_keccak_turbo_f);
+}
+#endif
+
 int sha3_shake_memory(int num, const unsigned char *in, unsigned long inlen, unsigned char *out, const unsigned long *outlen)
 {
    hash_state md;

src/hashes/sha3_test.c

@@ -3,6 +3,7 @@
 
 /* based on https://github.com/brainhub/SHA3IUF (public domain) */
 
+#include "../../tests/common.h"
 #include "tomcrypt_private.h"
 
 #ifdef LTC_SHA3
@@ -388,6 +389,166 @@ int sha3_shake_test(void)
 #endif
 }
 
+#ifdef LTC_TURBO_SHAKE
+int turbo_shake_test(void)
+{
+#ifndef LTC_TEST
+   return CRYPT_NOP;
+#else
+   int counter;
+   unsigned char hash[64];
+   hash_state c;
+   int i;
+
+   /* https://datatracker.ietf.org/doc/html/rfc9861#name-test-vectors */
+   /* https://www.rfc-editor.org/rfc/rfc9861.txt */
+   const unsigned char turbo_shake_input_single_zero[] = {
+      0x00,
+   };
+   const unsigned char turbo_shake_input_ptn_17_pow_1[] = {
+      0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+      0x10,
+   };
+   const unsigned char turbo_shake_input_ptn_17_pow_2[] = {
+      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,
+      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,
+   };
+
+   const unsigned char turbo_shake_128_empty[64] = {
+      0x1e, 0x41, 0x5f, 0x1c, 0x59, 0x83, 0xaf, 0xf2, 0x16, 0x92, 0x17, 0x27, 0x7d, 0x17, 0xbb, 0x53,
+      0x8c, 0xd9, 0x45, 0xa3, 0x97, 0xdd, 0xec, 0x54, 0x1f, 0x1c, 0xe4, 0x1a, 0xf2, 0xc1, 0xb7, 0x4c,
+      0x3e, 0x8c, 0xca, 0xe2, 0xa4, 0xda, 0xe5, 0x6c, 0x84, 0xa0, 0x4c, 0x23, 0x85, 0xc0, 0x3c, 0x15,
+      0xe8, 0x19, 0x3b, 0xdf, 0x58, 0x73, 0x73, 0x63, 0x32, 0x16, 0x91, 0xc0, 0x54, 0x62, 0xc8, 0xdf,
+   };
+   const unsigned char turbo_shake_128_empty_10032[32] = {
+      0xa3, 0xb9, 0xb0, 0x38, 0x59, 0x00, 0xce, 0x76, 0x1f, 0x22, 0xae, 0xd5, 0x48, 0xe7, 0x54, 0xda,
+      0x10, 0xa5, 0x24, 0x2d, 0x62, 0xe8, 0xc6, 0x58, 0xe3, 0xf3, 0xa9, 0x23, 0xa7, 0x55, 0x56, 0x07,
+   };
+   const unsigned char turbo_shake_128_single_zero_byte[32] = {
+      0x55, 0xce, 0xdd, 0x6f, 0x60, 0xaf, 0x7b, 0xb2, 0x9a, 0x40, 0x42, 0xae, 0x83, 0x2e, 0xf3, 0xf5,
+      0x8d, 0xb7, 0x29, 0x9f, 0x89, 0x3e, 0xbb, 0x92, 0x47, 0x24, 0x7d, 0x85, 0x69, 0x58, 0xda, 0xa9,
+   };
+   const unsigned char turbo_shake_128_ptn_pow_1[32] = {
+      0x9c, 0x97, 0xd0, 0x36, 0xa3, 0xba, 0xc8, 0x19, 0xdb, 0x70, 0xed, 0xe0, 0xca, 0x55, 0x4e, 0xc6,
+      0xe4, 0xc2, 0xa1, 0xa4, 0xff, 0xbf, 0xd9, 0xec, 0x26, 0x9c, 0xa6, 0xa1, 0x11, 0x16, 0x12, 0x33,
+   };
+   const unsigned char turbo_shake_128_ptn_pow_2[32] = {
+      0x96, 0xc7, 0x7c, 0x27, 0x9e, 0x01, 0x26, 0xf7, 0xfc, 0x07, 0xc9, 0xb0, 0x7f, 0x5c, 0xda, 0xe1,
+      0xe0, 0xbe, 0x60, 0xbd, 0xbe, 0x10, 0x62, 0x00, 0x40, 0xe7, 0x5d, 0x72, 0x23, 0xa6, 0x24, 0xd2,
+   };
+
+   const unsigned char turbo_shake_256_empty[64] = {
+      0x36, 0x7a, 0x32, 0x9d, 0xaf, 0xea, 0x87, 0x1c, 0x78, 0x02, 0xec, 0x67, 0xf9, 0x05, 0xae, 0x13,
+      0xc5, 0x76, 0x95, 0xdc, 0x2c, 0x66, 0x63, 0xc6, 0x10, 0x35, 0xf5, 0x9a, 0x18, 0xf8, 0xe7, 0xdb,
+      0x11, 0xed, 0xc0, 0xe1, 0x2e, 0x91, 0xea, 0x60, 0xeb, 0x6b, 0x32, 0xdf, 0x06, 0xdd, 0x7f, 0x00,
+      0x2f, 0xba, 0xfa, 0xbb, 0x6e, 0x13, 0xec, 0x1c, 0xc2, 0x0d, 0x99, 0x55, 0x47, 0x60, 0x0d, 0xb0,
+   };
+   const unsigned char turbo_shake_256_empty_10032[32] = {
+      0xab, 0xef, 0xa1, 0x16, 0x30, 0xc6, 0x61, 0x26, 0x92, 0x49, 0x74, 0x26, 0x85, 0xec, 0x08, 0x2f,
+      0x20, 0x72, 0x65, 0xdc, 0xcf, 0x2f, 0x43, 0x53, 0x4e, 0x9c, 0x61, 0xba, 0x0c, 0x9d, 0x1d, 0x75,
+   };
+   const unsigned char turbo_shake_256_single_zero_byte[64] = {
+      0x3e, 0x17, 0x12, 0xf9, 0x28, 0xf8, 0xea, 0xf1, 0x05, 0x46, 0x32, 0xb2, 0xaa, 0x0a, 0x24, 0x6e,
+      0xd8, 0xb0, 0xc3, 0x78, 0x72, 0x8f, 0x60, 0xbc, 0x97, 0x04, 0x10, 0x15, 0x5c, 0x28, 0x82, 0x0e,
+      0x90, 0xcc, 0x90, 0xd8, 0xa3, 0x00, 0x6a, 0xa2, 0x37, 0x2c, 0x5c, 0x5e, 0xa1, 0x76, 0xb0, 0x68,
+      0x2b, 0xf2, 0x2b, 0xae, 0x74, 0x67, 0xac, 0x94, 0xf7, 0x4d, 0x43, 0xd3, 0x9b, 0x04, 0x82, 0xe2,
+   };
+   const unsigned char turbo_shake_256_ptn_pow_1[64] = {
+      0xb3, 0xba, 0xb0, 0x30, 0x0e, 0x6a, 0x19, 0x1f, 0xbe, 0x61, 0x37, 0x93, 0x98, 0x35, 0x92, 0x35,
+      0x78, 0x79, 0x4e, 0xa5, 0x48, 0x43, 0xf5, 0x01, 0x10, 0x90, 0xfa, 0x2f, 0x37, 0x80, 0xa9, 0xe5,
+      0xcb, 0x22, 0xc5, 0x9d, 0x78, 0xb4, 0x0a, 0x0f, 0xbf, 0xf9, 0xe6, 0x72, 0xc0, 0xfb, 0xe0, 0x97,
+      0x0b, 0xd2, 0xc8, 0x45, 0x09, 0x1c, 0x60, 0x44, 0xd6, 0x87, 0x05, 0x4d, 0xa5, 0xd8, 0xe9, 0xc7,
+   };
+   const unsigned char turbo_shake_256_ptn_pow_2[64] = {
+      0x66, 0xb8, 0x10, 0xdb, 0x8e, 0x90, 0x78, 0x04, 0x24, 0xc0, 0x84, 0x73, 0x72, 0xfd, 0xc9, 0x57,
+      0x10, 0x88, 0x2f, 0xde, 0x31, 0xc6, 0xdf, 0x75, 0xbe, 0xb9, 0xd4, 0xcd, 0x93, 0x05, 0xcf, 0xca,
+      0xe3, 0x5e, 0x7b, 0x83, 0xe8, 0xb7, 0xe6, 0xeb, 0x4b, 0x78, 0x60, 0x58, 0x80, 0x11, 0x63, 0x16,
+      0xfe, 0x2c, 0x07, 0x8a, 0x09, 0xb9, 0x4a, 0xd7, 0xb8, 0x21, 0x3c, 0x0a, 0x73, 0x8b, 0x65, 0xc0,
+   };
+
+   counter = 0;
+
+   /* TurboSHAKE128 on an empty buffer */
+   sha3_shake_init(&c, 128);
+   turbo_shake_done(&c, hash, 64);
+   COMPARE_TESTVECTOR(hash, 64, turbo_shake_128_empty, sizeof(turbo_shake_128_empty), "TurboSHAKE128", counter++);
+
+   /* TurboSHAKE128 on an empty buffer, digest length 10032 bytes, test last 32 bytes */
+   sha3_shake_init(&c, 128);
+   for(i = 0; i != 10000 / 10; ++i){ turbo_shake_done(&c, hash, 10); }
+   turbo_shake_done(&c, hash, 32);
+   COMPARE_TESTVECTOR(hash, 32, turbo_shake_128_empty_10032, sizeof(turbo_shake_128_empty_10032), "TurboSHAKE128", counter++);
+
+   /* TurboSHAKE128 on single zero byte */
+   sha3_shake_init(&c, 128);
+   turbo_shake_process(&c, turbo_shake_input_single_zero, sizeof(turbo_shake_input_single_zero));
+   turbo_shake_done(&c, hash, 32);
+   COMPARE_TESTVECTOR(hash, 32, turbo_shake_128_single_zero_byte, sizeof(turbo_shake_128_single_zero_byte), "TurboSHAKE128", counter++);
+
+   /* TurboSHAKE128 on ptn(17**1) */
+   sha3_shake_init(&c, 128);
+   turbo_shake_process(&c, turbo_shake_input_ptn_17_pow_1, sizeof(turbo_shake_input_ptn_17_pow_1));
+   turbo_shake_done(&c, hash, 32);
+   COMPARE_TESTVECTOR(hash, 32, turbo_shake_128_ptn_pow_1, sizeof(turbo_shake_128_ptn_pow_1), "TurboSHAKE128", counter++);
+
+   /* TurboSHAKE128 on ptn(17**2) */
+   sha3_shake_init(&c, 128);
+   turbo_shake_process(&c, turbo_shake_input_ptn_17_pow_2, sizeof(turbo_shake_input_ptn_17_pow_2));
+   turbo_shake_done(&c, hash, 32);
+   COMPARE_TESTVECTOR(hash, 32, turbo_shake_128_ptn_pow_2, sizeof(turbo_shake_128_ptn_pow_2), "TurboSHAKE128", counter++);
+
+
+   /* TurboSHAKE256 on an empty buffer */
+   sha3_shake_init(&c, 256);
+   turbo_shake_done(&c, hash, 64);
+   COMPARE_TESTVECTOR(hash, 64, turbo_shake_256_empty, sizeof(turbo_shake_256_empty), "TurboSHAKE256", counter++);
+
+   /* TurboSHAKE256 on an empty buffer, digest length 10032 bytes, test last 32 bytes */
+   sha3_shake_init(&c, 256);
+   for(i = 0; i != 10000 / 10; ++i){ turbo_shake_done(&c, hash, 10); }
+   turbo_shake_done(&c, hash, 32);
+   COMPARE_TESTVECTOR(hash, 32, turbo_shake_256_empty_10032, sizeof(turbo_shake_256_empty_10032), "TurboSHAKE256", counter++);
+
+   /* TurboSHAKE256 on single zero byte */
+   sha3_shake_init(&c, 256);
+   turbo_shake_process(&c, turbo_shake_input_single_zero, sizeof(turbo_shake_input_single_zero));
+   turbo_shake_done(&c, hash, 64);
+   COMPARE_TESTVECTOR(hash, 64, turbo_shake_256_single_zero_byte, sizeof(turbo_shake_256_single_zero_byte), "TurboSHAKE256", counter++);
+
+   /* TurboSHAKE256 on ptn(17**1) */
+   sha3_shake_init(&c, 256);
+   turbo_shake_process(&c, turbo_shake_input_ptn_17_pow_1, sizeof(turbo_shake_input_ptn_17_pow_1));
+   turbo_shake_done(&c, hash, 64);
+   COMPARE_TESTVECTOR(hash, 64, turbo_shake_256_ptn_pow_1, sizeof(turbo_shake_256_ptn_pow_1), "TurboSHAKE256", counter++);
+
+   /* TurboSHAKE256 on ptn(17**2) */
+   sha3_shake_init(&c, 256);
+   turbo_shake_process(&c, turbo_shake_input_ptn_17_pow_2, sizeof(turbo_shake_input_ptn_17_pow_2));
+   turbo_shake_done(&c, hash, 64);
+   COMPARE_TESTVECTOR(hash, 64, turbo_shake_256_ptn_pow_2, sizeof(turbo_shake_256_ptn_pow_2), "TurboSHAKE256", counter++);
+
+   return CRYPT_OK;
+#endif
+}
+#endif
+
 #endif
 
 #ifdef LTC_KECCAK

src/headers/tomcrypt_custom.h

@@ -258,6 +258,7 @@
 #define LTC_WHIRLPOOL
 #define LTC_SHA3
 #define LTC_KECCAK
+#define LTC_TURBO_SHAKE
 #define LTC_SHA512
 #define LTC_SHA512_256
 #define LTC_SHA512_224

src/headers/tomcrypt_hash.h

@@ -302,6 +302,13 @@ int keccak_224_test(void);
 int keccak_done(hash_state *md, unsigned char *out);
 #endif
 
+#ifdef LTC_TURBO_SHAKE
+#define turbo_shake_init(a, b) sha3_shake_init(a, b)
+int turbo_shake_process(hash_state *md, const unsigned char *in, unsigned long inlen);
+int turbo_shake_done(hash_state *md, unsigned char *out, unsigned long outlen);
+int turbo_shake_test(void);
+#endif
+
 #ifdef LTC_SHA512
 int sha512_init(hash_state * md);
 int sha512_process(hash_state * md, const unsigned char *in, unsigned long inlen);

src/misc/crypt/crypt.c

@@ -157,6 +157,9 @@ const char *crypt_build_settings =
 #if defined(LTC_SHA3)
    "   SHA3\n"
 #endif
+#if defined(LTC_TURBO_SHAKE)
+   "   TurboSHAKE\n"
+#endif
 #if defined(LTC_KECCAK)
    "   KECCAK\n"
 #endif

tests/cipher_hash_test.c

@@ -60,6 +60,9 @@ int cipher_hash_test(void)
    /* SHAKE128 + SHAKE256 tests are a bit special */
    DOX(sha3_shake_test(), "sha3_shake");
 #endif
+#ifdef LTC_TURBO_SHAKE
+   DO(turbo_shake_test());
+#endif
 
    return 0;
 }