Mercurial > dropbear
annotate libtomcrypt/src/encauth/gcm/gcm_memory.c @ 297:79bf1023cf11 agent-client
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to branch 'au.asn.ucc.matt.dropbear.cli-agent' (head 01038174ec27245b51bd43a66c01ad930880f67b)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 21 Mar 2006 16:20:59 +0000 |
parents | 1b9e69c058d2 |
children | 0cbe8f6dbf9e |
rev | line source |
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285
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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 * Tom St Denis, [email protected], http://libtomcrypt.org |
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10 */ |
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11 |
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12 /** |
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13 @file gcm_memory.c |
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14 GCM implementation, process a packet, by Tom St Denis |
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15 */ |
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16 #include "tomcrypt.h" |
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17 |
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18 #ifdef GCM_MODE |
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19 |
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20 /** |
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21 Process an entire GCM packet in one call. |
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22 @param cipher Index of cipher to use |
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23 @param key The secret key |
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24 @param keylen The length of the secret key |
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25 @param IV The initial vector |
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26 @param IVlen The length of the initial vector |
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27 @param adata The additional authentication data (header) |
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28 @param adatalen The length of the adata |
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29 @param pt The plaintext |
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30 @param ptlen The length of the plaintext (ciphertext length is the same) |
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31 @param ct The ciphertext |
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32 @param tag [out] The MAC tag |
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33 @param taglen [in/out] The MAC tag length |
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34 @param direction Encrypt or Decrypt mode (GCM_ENCRYPT or GCM_DECRYPT) |
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35 @return CRYPT_OK on success |
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36 */ |
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37 int gcm_memory( int cipher, |
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38 const unsigned char *key, unsigned long keylen, |
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39 const unsigned char *IV, unsigned long IVlen, |
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40 const unsigned char *adata, unsigned long adatalen, |
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41 unsigned char *pt, unsigned long ptlen, |
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42 unsigned char *ct, |
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43 unsigned char *tag, unsigned long *taglen, |
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44 int direction) |
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45 { |
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46 gcm_state *gcm; |
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47 int err; |
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48 |
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49 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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50 return err; |
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51 } |
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52 |
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53 if (cipher_descriptor[cipher].accel_gcm_memory != NULL) { |
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54 cipher_descriptor[cipher].accel_gcm_memory |
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55 (key, keylen, |
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56 IV, IVlen, |
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57 adata, adatalen, |
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58 pt, ptlen, |
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59 ct, |
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60 tag, taglen, |
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61 direction); |
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62 return CRYPT_OK; |
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63 } |
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64 |
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65 |
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66 gcm = XMALLOC(sizeof(*gcm)); |
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67 if (gcm == NULL) { |
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68 return CRYPT_MEM; |
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69 } |
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70 |
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71 if ((err = gcm_init(gcm, cipher, key, keylen)) != CRYPT_OK) { |
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72 goto LTC_ERR; |
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73 } |
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74 if ((err = gcm_add_iv(gcm, IV, IVlen)) != CRYPT_OK) { |
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75 goto LTC_ERR; |
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76 } |
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77 if ((err = gcm_add_aad(gcm, adata, adatalen)) != CRYPT_OK) { |
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78 goto LTC_ERR; |
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79 } |
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80 if ((err = gcm_process(gcm, pt, ptlen, ct, direction)) != CRYPT_OK) { |
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81 goto LTC_ERR; |
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82 } |
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83 err = gcm_done(gcm, tag, taglen); |
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84 LTC_ERR: |
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85 XFREE(gcm); |
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86 return err; |
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87 } |
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88 #endif |
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89 |
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90 |
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91 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_memory.c,v $ */ |
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92 /* $Revision: 1.19 $ */ |
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93 /* $Date: 2005/05/05 14:35:58 $ */ |