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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 /* PMAC implementation by Tom St Denis */ |
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13 #include "mycrypt.h" |
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14 |
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15 #ifdef PMAC |
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16 |
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17 int pmac_done(pmac_state *state, unsigned char *out, unsigned long *outlen) |
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18 { |
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19 int err, x; |
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20 |
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21 _ARGCHK(state != NULL); |
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22 _ARGCHK(out != NULL); |
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23 if ((err = cipher_is_valid(state->cipher_idx)) != CRYPT_OK) { |
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24 return err; |
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25 } |
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26 |
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27 if ((state->buflen > (int)sizeof(state->block)) || (state->buflen < 0) || |
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28 (state->block_len > (int)sizeof(state->block)) || (state->buflen > state->block_len)) { |
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29 return CRYPT_INVALID_ARG; |
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30 } |
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31 |
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32 |
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33 /* handle padding. If multiple xor in L/x */ |
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34 |
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35 if (state->buflen == state->block_len) { |
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36 /* xor Lr against the checksum */ |
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37 for (x = 0; x < state->block_len; x++) { |
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38 state->checksum[x] ^= state->block[x] ^ state->Lr[x]; |
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39 } |
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40 } else { |
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41 /* otherwise xor message bytes then the 0x80 byte */ |
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42 for (x = 0; x < state->buflen; x++) { |
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43 state->checksum[x] ^= state->block[x]; |
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44 } |
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45 state->checksum[x] ^= 0x80; |
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46 } |
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47 |
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48 /* encrypt it */ |
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49 cipher_descriptor[state->cipher_idx].ecb_encrypt(state->checksum, state->checksum, &state->key); |
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50 |
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51 /* store it */ |
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52 for (x = 0; x < state->block_len && x <= (int)*outlen; x++) { |
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53 out[x] = state->checksum[x]; |
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54 } |
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55 *outlen = x; |
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56 |
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57 #ifdef CLEAN_STACK |
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58 zeromem(state, sizeof(*state)); |
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59 #endif |
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60 return CRYPT_OK; |
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61 } |
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62 |
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63 #endif |
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64 |
