/* 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.
 *
 * Tom St Denis, [email protected], http://libtomcrypt.com
 */

/* 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 <[email protected]>
  * @author Antoon Bosselaers <[email protected]>
  * @author Paulo Barreto <[email protected]>
---
 */
/**
  @file aes.c
  Implementation of AES
*/   

#include "options.h"
#include "tomcrypt.h"

#ifdef DROPBEAR_AES_ASM

#define SETUP    aes_asm_setup
#define ECB_ENC  aes_asm_ecb_encrypt
#define ECB_DEC  aes_asm_ecb_decrypt
#define ECB_DONE aes_asm_done
#define ECB_TEST aes_asm_test
#define ECB_KS   aes_asm_keysize


/* Matches the AES key structure used by OpenSSL */
struct aes_asm_key {
    ulong32 key[60];
    int rounds;
};

struct aes_asm_keypair {
    struct aes_asm_key enc;
    struct aes_asm_key dec;
};

int private_AES_set_encrypt_key(const unsigned char* key, 
    int keybits, struct aes_asm_key* key_state);
int private_AES_set_decrypt_key(const unsigned char* key, 
    int keybits, struct aes_asm_key* key_state);
int AES_encrypt(const unsigned char* in, 
    const unsigned char* out,
    struct aes_asm_key* key_state);
int AES_decrypt(const unsigned char* in, 
    const unsigned char* out,
    struct aes_asm_key* key_state);

 /**
    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)
{
    struct aes_asm_keypair *keypair = NULL;
    LTC_ARGCHK(key  != NULL);
    LTC_ARGCHK(skey != NULL);
  
    if (keylen != 16 && keylen != 24 && keylen != 32) {
       return CRYPT_INVALID_KEYSIZE;
    }
    
    if (num_rounds != 0)
    {
       return CRYPT_INVALID_ROUNDS;
    }

    skey->data = XMALLOC(sizeof(*keypair));
    keypair = skey->data;
    private_AES_set_encrypt_key(key, keylen*8, &keypair->enc);
    private_AES_set_decrypt_key(key, keylen*8, &keypair->dec);
    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
*/
int ECB_ENC(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
{
    struct aes_asm_keypair *keypair = NULL;
    LTC_ARGCHK(pt != NULL);
    LTC_ARGCHK(ct != NULL);
    LTC_ARGCHK(skey != NULL);

    keypair = skey->data;
    AES_encrypt(pt, ct, &keypair->enc);

    return CRYPT_OK;
}

/**
  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
*/
int ECB_DEC(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
{
    struct aes_asm_keypair *keypair = NULL;

    LTC_ARGCHK(pt != NULL);
    LTC_ARGCHK(ct != NULL);
    LTC_ARGCHK(skey != NULL);

    keypair = skey->data;
    AES_encrypt(pt, ct, &keypair->enc);
    
    return CRYPT_OK;
}

#ifdef LTC_CLEAN_STACK
#error No clean stack support in ASM AES
#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 (XMEMCMP(tmp[0], tests[i].ct, 16) || XMEMCMP(tmp[1], tests[i].pt, 16)) { 
#if 0
       printf("\n\nTest %d failed\n", i);
       if (XMEMCMP(tmp[0], tests[i].ct, 16)) {
          printf("CT: ");
          for (i = 0; i < 16; i++) {
             printf("%02x ", tmp[0][i]);
          }
          printf("\n");
       } else {
          printf("PT: ");
          for (i = 0; i < 16; i++) {
             printf("%02x ", tmp[1][i]);
          }
          printf("\n");
       }
#endif       
        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
}

/** Terminate the context 
   @param skey    The scheduled key
*/
void ECB_DONE(symmetric_key *skey)
{
    XFREE(skey->data);
}


/**
  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;
   }
}

const struct ltc_cipher_descriptor aes_asm_desc =
{
    "aes_asm",
    106,
    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
};

#endif /*  AES_ASM */



/* $Source: /cvs/libtom/libtomcrypt/src/ciphers/aes/aes.c,v $ */
/* $Revision: 1.14 $ */
/* $Date: 2006/11/08 23:01:06 $ */