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annotate rsa_exptmod.c @ 0:d7da3b1e1540 libtomcrypt

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put back the 0.95 makefile which was inadvertently merged over
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:21:40 +0000
parents
children 6362d3854bb4
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d7da3b1e1540 put back the 0.95 makefile which was inadvertently merged over
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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 /* RSA Code by Tom St Denis */
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13 #include "mycrypt.h"
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14
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15 #ifdef MRSA
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16
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17 int rsa_exptmod(const unsigned char *in, unsigned long inlen,
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18 unsigned char *out, unsigned long *outlen, int which,
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19 rsa_key *key)
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20 {
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21 mp_int tmp, tmpa, tmpb;
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22 unsigned long x;
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23 int err;
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24
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25 _ARGCHK(in != NULL);
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26 _ARGCHK(out != NULL);
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27 _ARGCHK(outlen != NULL);
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28 _ARGCHK(key != NULL);
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29
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30 if (which == PK_PRIVATE && (key->type != PK_PRIVATE && key->type != PK_PRIVATE_OPTIMIZED)) {
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31 return CRYPT_PK_NOT_PRIVATE;
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32 }
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33
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34 /* must be a private or public operation */
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35 if (which != PK_PRIVATE && which != PK_PUBLIC) {
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36 return CRYPT_PK_INVALID_TYPE;
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37 }
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38
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39 /* init and copy into tmp */
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40 if ((err = mp_init_multi(&tmp, &tmpa, &tmpb, NULL)) != MP_OKAY) { goto error; }
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41 if ((err = mp_read_unsigned_bin(&tmp, (unsigned char *)in, (int)inlen)) != MP_OKAY) { goto error; }
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42
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43 /* sanity check on the input */
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44 if (mp_cmp(&key->N, &tmp) == MP_LT) {
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45 err = CRYPT_PK_INVALID_SIZE;
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46 goto done;
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47 }
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48
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49 /* are we using the private exponent and is the key optimized? */
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50 if (which == PK_PRIVATE && key->type == PK_PRIVATE_OPTIMIZED) {
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51 /* tmpa = tmp^dP mod p */
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52 if ((err = mp_exptmod(&tmp, &key->dP, &key->p, &tmpa)) != MP_OKAY) { goto error; }
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53
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54 /* tmpb = tmp^dQ mod q */
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55 if ((err = mp_exptmod(&tmp, &key->dQ, &key->q, &tmpb)) != MP_OKAY) { goto error; }
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56
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57 /* tmp = tmpa*qP + tmpb*pQ mod N */
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58 if ((err = mp_mul(&tmpa, &key->qP, &tmpa)) != MP_OKAY) { goto error; }
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59 if ((err = mp_mul(&tmpb, &key->pQ, &tmpb)) != MP_OKAY) { goto error; }
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60 if ((err = mp_addmod(&tmpa, &tmpb, &key->N, &tmp)) != MP_OKAY) { goto error; }
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61 } else {
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62 /* exptmod it */
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63 if ((err = mp_exptmod(&tmp, which==PK_PRIVATE?&key->d:&key->e, &key->N, &tmp)) != MP_OKAY) { goto error; }
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64 }
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65
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66 /* read it back */
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67 x = (unsigned long)mp_unsigned_bin_size(&tmp);
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68 if (x > *outlen) {
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69 err = CRYPT_BUFFER_OVERFLOW;
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70 goto done;
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71 }
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72 *outlen = x;
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73
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74 /* convert it */
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75 if ((err = mp_to_unsigned_bin(&tmp, out)) != MP_OKAY) { goto error; }
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76
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77 /* clean up and return */
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78 err = CRYPT_OK;
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79 goto done;
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80 error:
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81 err = mpi_to_ltc_error(err);
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82 done:
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83 mp_clear_multi(&tmp, &tmpa, &tmpb, NULL);
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84 return err;
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85 }
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86
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87 #endif