Mercurial > dropbear
annotate libtomcrypt/src/modes/f8/f8_encrypt.c @ 1794:ed20d805b332
Disable UNAUTH_CLOSE_DELAY by default
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 02 Mar 2021 22:20:14 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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382
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file f8_encrypt.c |
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13 F8 implementation, encrypt data, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_F8_MODE |
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17 |
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18 /** |
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19 F8 encrypt |
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20 @param pt Plaintext |
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21 @param ct [out] Ciphertext |
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22 @param len Length of plaintext (octets) |
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23 @param f8 F8 state |
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24 @return CRYPT_OK if successful |
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25 */ |
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26 int f8_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_F8 *f8) |
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27 { |
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28 int err, x; |
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29 unsigned char buf[MAXBLOCKSIZE]; |
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30 LTC_ARGCHK(pt != NULL); |
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31 LTC_ARGCHK(ct != NULL); |
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32 LTC_ARGCHK(f8 != NULL); |
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33 if ((err = cipher_is_valid(f8->cipher)) != CRYPT_OK) { |
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34 return err; |
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35 } |
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36 |
382
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37 /* is blocklen/padlen valid? */ |
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38 if (f8->blocklen < 0 || f8->blocklen > (int)sizeof(f8->IV) || |
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39 f8->padlen < 0 || f8->padlen > (int)sizeof(f8->IV)) { |
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40 return CRYPT_INVALID_ARG; |
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41 } |
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42 |
382
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43 zeromem(buf, sizeof(buf)); |
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44 |
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45 /* make sure the pad is empty */ |
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46 if (f8->padlen == f8->blocklen) { |
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47 /* xor of IV, MIV and blockcnt == what goes into cipher */ |
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48 STORE32H(f8->blockcnt, (buf+(f8->blocklen-4))); |
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49 ++(f8->blockcnt); |
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50 for (x = 0; x < f8->blocklen; x++) { |
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51 f8->IV[x] ^= f8->MIV[x] ^ buf[x]; |
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52 } |
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53 if ((err = cipher_descriptor[f8->cipher].ecb_encrypt(f8->IV, f8->IV, &f8->key)) != CRYPT_OK) { |
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54 return err; |
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55 } |
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56 f8->padlen = 0; |
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57 } |
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58 |
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59 #ifdef LTC_FAST |
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60 if (f8->padlen == 0) { |
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61 while (len >= (unsigned long)f8->blocklen) { |
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62 STORE32H(f8->blockcnt, (buf+(f8->blocklen-4))); |
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63 ++(f8->blockcnt); |
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64 for (x = 0; x < f8->blocklen; x += sizeof(LTC_FAST_TYPE)) { |
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65 *(LTC_FAST_TYPE_PTR_CAST(&ct[x])) = *(LTC_FAST_TYPE_PTR_CAST(&pt[x])) ^ *(LTC_FAST_TYPE_PTR_CAST(&f8->IV[x])); |
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66 *(LTC_FAST_TYPE_PTR_CAST(&f8->IV[x])) ^= *(LTC_FAST_TYPE_PTR_CAST(&f8->MIV[x])) ^ *(LTC_FAST_TYPE_PTR_CAST(&buf[x])); |
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67 } |
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68 if ((err = cipher_descriptor[f8->cipher].ecb_encrypt(f8->IV, f8->IV, &f8->key)) != CRYPT_OK) { |
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69 return err; |
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70 } |
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71 len -= x; |
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72 pt += x; |
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73 ct += x; |
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74 } |
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75 } |
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76 #endif |
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77 |
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78 while (len > 0) { |
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79 if (f8->padlen == f8->blocklen) { |
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80 /* xor of IV, MIV and blockcnt == what goes into cipher */ |
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81 STORE32H(f8->blockcnt, (buf+(f8->blocklen-4))); |
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82 ++(f8->blockcnt); |
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83 for (x = 0; x < f8->blocklen; x++) { |
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84 f8->IV[x] ^= f8->MIV[x] ^ buf[x]; |
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85 } |
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86 if ((err = cipher_descriptor[f8->cipher].ecb_encrypt(f8->IV, f8->IV, &f8->key)) != CRYPT_OK) { |
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87 return err; |
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88 } |
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89 f8->padlen = 0; |
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90 } |
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91 *ct++ = *pt++ ^ f8->IV[f8->padlen++]; |
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92 --len; |
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93 } |
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94 return CRYPT_OK; |
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95 } |
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96 |
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97 #endif |
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98 |
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99 /* ref: $Format:%D$ */ |
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100 /* git commit: $Format:%H$ */ |
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101 /* commit time: $Format:%ai$ */ |