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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 /* EAX Implementation by Tom St Denis */ |
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13 #include "mycrypt.h" |
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14 |
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15 #ifdef EAX_MODE |
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16 |
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17 int eax_decrypt(eax_state *eax, const unsigned char *ct, unsigned char *pt, unsigned long length) |
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18 { |
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19 int err; |
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20 |
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21 _ARGCHK(eax != NULL); |
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22 _ARGCHK(pt != NULL); |
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23 _ARGCHK(ct != NULL); |
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24 |
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25 /* omac ciphertext */ |
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26 if ((err = omac_process(&eax->ctomac, ct, length)) != CRYPT_OK) { |
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27 return err; |
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28 } |
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29 |
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30 /* decrypt */ |
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31 return ctr_decrypt(ct, pt, length, &eax->ctr); |
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32 } |
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33 |
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34 #endif |
