/* LibTomCrypt, modular cryptographic library -- Tom St Denis

 *

 * LibTomCrypt is a library that provides various cryptographic

 * algorithms in a highly modular and flexible manner.

 *

 * The library is free for all purposes without any express

 * guarantee it works.

 */

/* AES implementation by Tom St Denis

 *

 * Derived from the Public Domain source code by

---

  * rijndael-alg-fst.c

  *

  * @version 3.0 (December 2000)

  *

  * Optimised ANSI C code for the Rijndael cipher (now AES)

  *

  * @author Vincent Rijmen <vincent.rijmen@esat.kuleuven.ac.be>

  * @author Antoon Bosselaers <antoon.bosselaers@esat.kuleuven.ac.be>

  * @author Paulo Barreto <paulo.barreto@terra.com.br>

---

 */

/**

  @file aes.c

  Implementation of AES

*/

#include "tomcrypt.h"

#ifdef LTC_RIJNDAEL

#ifndef ENCRYPT_ONLY

#define SETUP    rijndael_setup

#define ECB_ENC  rijndael_ecb_encrypt

#define ECB_DEC  rijndael_ecb_decrypt

#define ECB_DONE rijndael_done

#define ECB_TEST rijndael_test

#define ECB_KS   rijndael_keysize

#if 0

const struct ltc_cipher_descriptor rijndael_desc =

{

    "rijndael",

    6,

    16, 32, 16, 10,

    SETUP, ECB_ENC, ECB_DEC, ECB_TEST, ECB_DONE, ECB_KS,

    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL

};

#endif

const struct ltc_cipher_descriptor aes_desc =

{

    "aes",

    6,

    16, 32, 16, 10,

    SETUP, ECB_ENC, ECB_DEC, ECB_TEST, ECB_DONE, ECB_KS,

    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL

};

#else

#define SETUP    rijndael_enc_setup

#define ECB_ENC  rijndael_enc_ecb_encrypt

#define ECB_KS   rijndael_enc_keysize

#define ECB_DONE rijndael_enc_done

const struct ltc_cipher_descriptor rijndael_enc_desc =

{

    "rijndael",

    6,

    16, 32, 16, 10,

    SETUP, ECB_ENC, NULL, NULL, ECB_DONE, ECB_KS,

    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL

};

const struct ltc_cipher_descriptor aes_enc_desc =

{

    "aes",

    6,

    16, 32, 16, 10,

    SETUP, ECB_ENC, NULL, NULL, ECB_DONE, ECB_KS,

    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL

};

#endif

#define __LTC_AES_TAB_C__

#include "aes_tab.c"

static ulong32 setup_mix(ulong32 temp)

{

   return (Te4_3[byte(temp, 2)]) ^

          (Te4_2[byte(temp, 1)]) ^

          (Te4_1[byte(temp, 0)]) ^

          (Te4_0[byte(temp, 3)]);

}

#ifndef ENCRYPT_ONLY

#ifdef LTC_SMALL_CODE

static ulong32 setup_mix2(ulong32 temp)

{

   return Td0(255 & Te4[byte(temp, 3)]) ^

          Td1(255 & Te4[byte(temp, 2)]) ^

          Td2(255 & Te4[byte(temp, 1)]) ^

          Td3(255 & Te4[byte(temp, 0)]);

}

#endif

#endif

 /**

    Initialize the AES (Rijndael) block cipher

    @param key The symmetric key you wish to pass

    @param keylen The key length in bytes

    @param num_rounds The number of rounds desired (0 for default)

    @param skey The key in as scheduled by this function.

    @return CRYPT_OK if successful

 */

int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)

{

    int i;

    ulong32 temp, *rk;

#ifndef ENCRYPT_ONLY

    ulong32 *rrk;

#endif

    LTC_ARGCHK(key  != NULL);

    LTC_ARGCHK(skey != NULL);

    if (keylen != 16 && keylen != 24 && keylen != 32) {

       return CRYPT_INVALID_KEYSIZE;

    }

    if (num_rounds != 0 && num_rounds != (10 + ((keylen/8)-2)*2)) {

       return CRYPT_INVALID_ROUNDS;

    }

    skey->rijndael.Nr = 10 + ((keylen/8)-2)*2;

    /* setup the forward key */

    i                 = 0;

    rk                = skey->rijndael.eK;

    LOAD32H(rk[0], key     );

    LOAD32H(rk[1], key +  4);

    LOAD32H(rk[2], key +  8);

    LOAD32H(rk[3], key + 12);

    if (keylen == 16) {

        for (;;) {

            temp  = rk[3];

            rk[4] = rk[0] ^ setup_mix(temp) ^ rcon[i];

            rk[5] = rk[1] ^ rk[4];

            rk[6] = rk[2] ^ rk[5];

            rk[7] = rk[3] ^ rk[6];

            if (++i == 10) {

               break;

            }

            rk += 4;

        }

    } else if (keylen == 24) {

        LOAD32H(rk[4], key + 16);

        LOAD32H(rk[5], key + 20);

        for (;;) {

        #ifdef _MSC_VER

            temp = skey->rijndael.eK[rk - skey->rijndael.eK + 5];

        #else

            temp = rk[5];

        #endif

            rk[ 6] = rk[ 0] ^ setup_mix(temp) ^ rcon[i];

            rk[ 7] = rk[ 1] ^ rk[ 6];

            rk[ 8] = rk[ 2] ^ rk[ 7];

            rk[ 9] = rk[ 3] ^ rk[ 8];

            if (++i == 8) {

                break;

            }

            rk[10] = rk[ 4] ^ rk[ 9];

            rk[11] = rk[ 5] ^ rk[10];

            rk += 6;

        }

    } else if (keylen == 32) {

        LOAD32H(rk[4], key + 16);

        LOAD32H(rk[5], key + 20);

        LOAD32H(rk[6], key + 24);

        LOAD32H(rk[7], key + 28);

        for (;;) {

        #ifdef _MSC_VER

            temp = skey->rijndael.eK[rk - skey->rijndael.eK + 7];

        #else

            temp = rk[7];

        #endif

            rk[ 8] = rk[ 0] ^ setup_mix(temp) ^ rcon[i];

            rk[ 9] = rk[ 1] ^ rk[ 8];

            rk[10] = rk[ 2] ^ rk[ 9];

            rk[11] = rk[ 3] ^ rk[10];

            if (++i == 7) {

                break;

            }

            temp = rk[11];

            rk[12] = rk[ 4] ^ setup_mix(RORc(temp, 8));

            rk[13] = rk[ 5] ^ rk[12];

            rk[14] = rk[ 6] ^ rk[13];

            rk[15] = rk[ 7] ^ rk[14];

            rk += 8;

        }

    } else {

       /* this can't happen */

       /* coverity[dead_error_line] */

       return CRYPT_ERROR;

    }

#ifndef ENCRYPT_ONLY

    /* setup the inverse key now */

    rk   = skey->rijndael.dK;

    rrk  = skey->rijndael.eK + (28 + keylen) - 4;

    /* apply the inverse MixColumn transform to all round keys but the first and the last: */

    /* copy first */

    *rk++ = *rrk++;

    *rk++ = *rrk++;

    *rk++ = *rrk++;

    *rk   = *rrk;

    rk -= 3; rrk -= 3;

    for (i = 1; i < skey->rijndael.Nr; i++) {

        rrk -= 4;

        rk  += 4;

    #ifdef LTC_SMALL_CODE

        temp = rrk[0];

        rk[0] = setup_mix2(temp);

        temp = rrk[1];

        rk[1] = setup_mix2(temp);

        temp = rrk[2];

        rk[2] = setup_mix2(temp);

        temp = rrk[3];

        rk[3] = setup_mix2(temp);

     #else

        temp = rrk[0];

        rk[0] =

            Tks0[byte(temp, 3)] ^

            Tks1[byte(temp, 2)] ^

            Tks2[byte(temp, 1)] ^

            Tks3[byte(temp, 0)];

        temp = rrk[1];

        rk[1] =

            Tks0[byte(temp, 3)] ^

            Tks1[byte(temp, 2)] ^

            Tks2[byte(temp, 1)] ^

            Tks3[byte(temp, 0)];

        temp = rrk[2];

        rk[2] =

            Tks0[byte(temp, 3)] ^

            Tks1[byte(temp, 2)] ^

            Tks2[byte(temp, 1)] ^

            Tks3[byte(temp, 0)];

        temp = rrk[3];

        rk[3] =

            Tks0[byte(temp, 3)] ^

            Tks1[byte(temp, 2)] ^

            Tks2[byte(temp, 1)] ^

            Tks3[byte(temp, 0)];

      #endif

    }

    /* copy last */

    rrk -= 4;

    rk  += 4;

    *rk++ = *rrk++;

    *rk++ = *rrk++;

    *rk++ = *rrk++;

    *rk   = *rrk;

#endif /* ENCRYPT_ONLY */

    return CRYPT_OK;

}

/**

  Encrypts a block of text with AES

  @param pt The input plaintext (16 bytes)

  @param ct The output ciphertext (16 bytes)

  @param skey The key as scheduled

  @return CRYPT_OK if successful

*/

#ifdef LTC_CLEAN_STACK

static int _rijndael_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)

#else

int ECB_ENC(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)

#endif

{

    ulong32 s0, s1, s2, s3, t0, t1, t2, t3, *rk;

    int Nr, r;

    LTC_ARGCHK(pt != NULL);

    LTC_ARGCHK(ct != NULL);

    LTC_ARGCHK(skey != NULL);

    Nr = skey->rijndael.Nr;

    rk = skey->rijndael.eK;

    /*

     * map byte array block to cipher state

     * and add initial round key:

     */

    LOAD32H(s0, pt      ); s0 ^= rk[0];

    LOAD32H(s1, pt  +  4); s1 ^= rk[1];

    LOAD32H(s2, pt  +  8); s2 ^= rk[2];

    LOAD32H(s3, pt  + 12); s3 ^= rk[3];

#ifdef LTC_SMALL_CODE

    for (r = 0; ; r++) {

        rk += 4;

        t0 =

            Te0(byte(s0, 3)) ^

            Te1(byte(s1, 2)) ^

            Te2(byte(s2, 1)) ^

            Te3(byte(s3, 0)) ^

            rk[0];

        t1 =

            Te0(byte(s1, 3)) ^

            Te1(byte(s2, 2)) ^

            Te2(byte(s3, 1)) ^

            Te3(byte(s0, 0)) ^

            rk[1];

        t2 =

            Te0(byte(s2, 3)) ^

            Te1(byte(s3, 2)) ^

            Te2(byte(s0, 1)) ^

            Te3(byte(s1, 0)) ^

            rk[2];

        t3 =

            Te0(byte(s3, 3)) ^

            Te1(byte(s0, 2)) ^

            Te2(byte(s1, 1)) ^

            Te3(byte(s2, 0)) ^

            rk[3];

        if (r == Nr-2) {

           break;

        }

        s0 = t0; s1 = t1; s2 = t2; s3 = t3;

    }

    rk += 4;

#else

    /*

     * Nr - 1 full rounds:

     */

    r = Nr >> 1;

    for (;;) {

        t0 =

            Te0(byte(s0, 3)) ^

            Te1(byte(s1, 2)) ^

            Te2(byte(s2, 1)) ^

            Te3(byte(s3, 0)) ^

            rk[4];

        t1 =

            Te0(byte(s1, 3)) ^

            Te1(byte(s2, 2)) ^

            Te2(byte(s3, 1)) ^

            Te3(byte(s0, 0)) ^

            rk[5];

        t2 =

            Te0(byte(s2, 3)) ^

            Te1(byte(s3, 2)) ^

            Te2(byte(s0, 1)) ^

            Te3(byte(s1, 0)) ^

            rk[6];

        t3 =

            Te0(byte(s3, 3)) ^

            Te1(byte(s0, 2)) ^

            Te2(byte(s1, 1)) ^

            Te3(byte(s2, 0)) ^

            rk[7];

        rk += 8;

        if (--r == 0) {

            break;

        }

        s0 =

            Te0(byte(t0, 3)) ^

            Te1(byte(t1, 2)) ^

            Te2(byte(t2, 1)) ^

            Te3(byte(t3, 0)) ^

            rk[0];

        s1 =

            Te0(byte(t1, 3)) ^

            Te1(byte(t2, 2)) ^

            Te2(byte(t3, 1)) ^

            Te3(byte(t0, 0)) ^

            rk[1];

        s2 =

            Te0(byte(t2, 3)) ^

            Te1(byte(t3, 2)) ^

            Te2(byte(t0, 1)) ^

            Te3(byte(t1, 0)) ^

            rk[2];

        s3 =

            Te0(byte(t3, 3)) ^

            Te1(byte(t0, 2)) ^

            Te2(byte(t1, 1)) ^

            Te3(byte(t2, 0)) ^

            rk[3];

    }

#endif

    /*

     * apply last round and

     * map cipher state to byte array block:

     */

    s0 =

        (Te4_3[byte(t0, 3)]) ^

        (Te4_2[byte(t1, 2)]) ^

        (Te4_1[byte(t2, 1)]) ^

        (Te4_0[byte(t3, 0)]) ^

        rk[0];

    STORE32H(s0, ct);

    s1 =

        (Te4_3[byte(t1, 3)]) ^

        (Te4_2[byte(t2, 2)]) ^

        (Te4_1[byte(t3, 1)]) ^

        (Te4_0[byte(t0, 0)]) ^

        rk[1];

    STORE32H(s1, ct+4);

    s2 =

        (Te4_3[byte(t2, 3)]) ^

        (Te4_2[byte(t3, 2)]) ^

        (Te4_1[byte(t0, 1)]) ^

        (Te4_0[byte(t1, 0)]) ^

        rk[2];

    STORE32H(s2, ct+8);

    s3 =

        (Te4_3[byte(t3, 3)]) ^

        (Te4_2[byte(t0, 2)]) ^

        (Te4_1[byte(t1, 1)]) ^

        (Te4_0[byte(t2, 0)]) ^

        rk[3];

    STORE32H(s3, ct+12);

    return CRYPT_OK;

}

#ifdef LTC_CLEAN_STACK

int ECB_ENC(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)

{

   int err = _rijndael_ecb_encrypt(pt, ct, skey);

   burn_stack(sizeof(unsigned long)*8 + sizeof(unsigned long*) + sizeof(int)*2);

   return err;

}

#endif

#ifndef ENCRYPT_ONLY

/**

  Decrypts a block of text with AES

  @param ct The input ciphertext (16 bytes)

  @param pt The output plaintext (16 bytes)

  @param skey The key as scheduled

  @return CRYPT_OK if successful

*/

#ifdef LTC_CLEAN_STACK

static int _rijndael_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)

#else

int ECB_DEC(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)

#endif

{

    ulong32 s0, s1, s2, s3, t0, t1, t2, t3, *rk;

    int Nr, r;

    LTC_ARGCHK(pt != NULL);

    LTC_ARGCHK(ct != NULL);

    LTC_ARGCHK(skey != NULL);

    Nr = skey->rijndael.Nr;

    rk = skey->rijndael.dK;

    /*

     * map byte array block to cipher state

     * and add initial round key:

     */

    LOAD32H(s0, ct      ); s0 ^= rk[0];

    LOAD32H(s1, ct  +  4); s1 ^= rk[1];

    LOAD32H(s2, ct  +  8); s2 ^= rk[2];

    LOAD32H(s3, ct  + 12); s3 ^= rk[3];

#ifdef LTC_SMALL_CODE

    for (r = 0; ; r++) {

        rk += 4;

        t0 =

            Td0(byte(s0, 3)) ^

            Td1(byte(s3, 2)) ^

            Td2(byte(s2, 1)) ^

            Td3(byte(s1, 0)) ^

            rk[0];

        t1 =

            Td0(byte(s1, 3)) ^

            Td1(byte(s0, 2)) ^

            Td2(byte(s3, 1)) ^

            Td3(byte(s2, 0)) ^

            rk[1];

        t2 =

            Td0(byte(s2, 3)) ^

            Td1(byte(s1, 2)) ^

            Td2(byte(s0, 1)) ^

            Td3(byte(s3, 0)) ^

            rk[2];

        t3 =

            Td0(byte(s3, 3)) ^

            Td1(byte(s2, 2)) ^

            Td2(byte(s1, 1)) ^

            Td3(byte(s0, 0)) ^

            rk[3];

        if (r == Nr-2) {

           break;

        }

        s0 = t0; s1 = t1; s2 = t2; s3 = t3;

    }

    rk += 4;

#else

    /*

     * Nr - 1 full rounds:

     */

    r = Nr >> 1;

    for (;;) {

        t0 =

            Td0(byte(s0, 3)) ^

            Td1(byte(s3, 2)) ^

            Td2(byte(s2, 1)) ^

            Td3(byte(s1, 0)) ^

            rk[4];

        t1 =

            Td0(byte(s1, 3)) ^

            Td1(byte(s0, 2)) ^

            Td2(byte(s3, 1)) ^

            Td3(byte(s2, 0)) ^

            rk[5];

        t2 =

            Td0(byte(s2, 3)) ^

            Td1(byte(s1, 2)) ^

            Td2(byte(s0, 1)) ^

            Td3(byte(s3, 0)) ^

            rk[6];

        t3 =

            Td0(byte(s3, 3)) ^

            Td1(byte(s2, 2)) ^

            Td2(byte(s1, 1)) ^

            Td3(byte(s0, 0)) ^

            rk[7];

        rk += 8;

        if (--r == 0) {

            break;

        }

        s0 =

            Td0(byte(t0, 3)) ^

            Td1(byte(t3, 2)) ^

            Td2(byte(t2, 1)) ^

            Td3(byte(t1, 0)) ^

            rk[0];

        s1 =

            Td0(byte(t1, 3)) ^

            Td1(byte(t0, 2)) ^

            Td2(byte(t3, 1)) ^

            Td3(byte(t2, 0)) ^

            rk[1];

        s2 =

            Td0(byte(t2, 3)) ^

            Td1(byte(t1, 2)) ^

            Td2(byte(t0, 1)) ^

            Td3(byte(t3, 0)) ^

            rk[2];

        s3 =

            Td0(byte(t3, 3)) ^

            Td1(byte(t2, 2)) ^

            Td2(byte(t1, 1)) ^

            Td3(byte(t0, 0)) ^

            rk[3];

    }

#endif

    /*

     * apply last round and

     * map cipher state to byte array block:

     */

    s0 =

        (Td4[byte(t0, 3)] & 0xff000000) ^

        (Td4[byte(t3, 2)] & 0x00ff0000) ^

        (Td4[byte(t2, 1)] & 0x0000ff00) ^

        (Td4[byte(t1, 0)] & 0x000000ff) ^

        rk[0];

    STORE32H(s0, pt);

    s1 =

        (Td4[byte(t1, 3)] & 0xff000000) ^

        (Td4[byte(t0, 2)] & 0x00ff0000) ^

        (Td4[byte(t3, 1)] & 0x0000ff00) ^

        (Td4[byte(t2, 0)] & 0x000000ff) ^

        rk[1];

    STORE32H(s1, pt+4);

    s2 =

        (Td4[byte(t2, 3)] & 0xff000000) ^

        (Td4[byte(t1, 2)] & 0x00ff0000) ^

        (Td4[byte(t0, 1)] & 0x0000ff00) ^

        (Td4[byte(t3, 0)] & 0x000000ff) ^

        rk[2];

    STORE32H(s2, pt+8);

    s3 =

        (Td4[byte(t3, 3)] & 0xff000000) ^

        (Td4[byte(t2, 2)] & 0x00ff0000) ^

        (Td4[byte(t1, 1)] & 0x0000ff00) ^

        (Td4[byte(t0, 0)] & 0x000000ff) ^

        rk[3];

    STORE32H(s3, pt+12);

    return CRYPT_OK;

}

#ifdef LTC_CLEAN_STACK

int ECB_DEC(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)

{

   int err = _rijndael_ecb_decrypt(ct, pt, skey);

   burn_stack(sizeof(unsigned long)*8 + sizeof(unsigned long*) + sizeof(int)*2);

   return err;

}

#endif

/**

  Performs a self-test of the AES block cipher

  @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled

*/

int ECB_TEST(void)

{

 #ifndef LTC_TEST

    return CRYPT_NOP;

 #else

 int err;

 static const struct {

     int keylen;

     unsigned char key[32], pt[16], ct[16];

 } tests[] = {

    { 16,

      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,

        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },

      { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,

        0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },

      { 0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30,

        0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a }

    }, {

      24,

      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,

        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,

        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },

      { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,

        0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },

      { 0xdd, 0xa9, 0x7c, 0xa4, 0x86, 0x4c, 0xdf, 0xe0,

        0x6e, 0xaf, 0x70, 0xa0, 0xec, 0x0d, 0x71, 0x91 }

    }, {

      32,

      { 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 },

      { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,

        0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },

      { 0x8e, 0xa2, 0xb7, 0xca, 0x51, 0x67, 0x45, 0xbf,

        0xea, 0xfc, 0x49, 0x90, 0x4b, 0x49, 0x60, 0x89 }

    }

 };

  symmetric_key key;

  unsigned char tmp[2][16];

  int i, y;

  for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {

    zeromem(&key, sizeof(key));

    if ((err = rijndael_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) {

       return err;

    }

    rijndael_ecb_encrypt(tests[i].pt, tmp[0], &key);

    rijndael_ecb_decrypt(tmp[0], tmp[1], &key);

    if (compare_testvector(tmp[0], 16, tests[i].ct, 16, "AES Encrypt", i) ||

          compare_testvector(tmp[1], 16, tests[i].pt, 16, "AES Decrypt", i)) {

        return CRYPT_FAIL_TESTVECTOR;

    }

    /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */

    for (y = 0; y < 16; y++) tmp[0][y] = 0;

    for (y = 0; y < 1000; y++) rijndael_ecb_encrypt(tmp[0], tmp[0], &key);

    for (y = 0; y < 1000; y++) rijndael_ecb_decrypt(tmp[0], tmp[0], &key);

    for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;

  }

  return CRYPT_OK;

 #endif

}

#endif /* ENCRYPT_ONLY */

/** Terminate the context

   @param skey    The scheduled key

*/

void ECB_DONE(symmetric_key *skey)

{

  LTC_UNUSED_PARAM(skey);

}

/**

  Gets suitable key size

  @param keysize [in/out] The length of the recommended key (in bytes).  This function will store the suitable size back in this variable.

  @return CRYPT_OK if the input key size is acceptable.

*/

int ECB_KS(int *keysize)

{

   LTC_ARGCHK(keysize != NULL);

   if (*keysize < 16)

      return CRYPT_INVALID_KEYSIZE;

   if (*keysize < 24) {

      *keysize = 16;

      return CRYPT_OK;

   } else if (*keysize < 32) {

      *keysize = 24;

      return CRYPT_OK;

   } else {

      *keysize = 32;

      return CRYPT_OK;

   }

}

#endif

/* ref:         $Format:%D$ */

/* git commit:  $Format:%H$ */

/* commit time: $Format:%ai$ */