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annotate src/pk/rsa/rsa_make_key.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
parents
children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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2 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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3 * LibTomCrypt is a library that provides various cryptographic
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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4 * algorithms in a highly modular and flexible manner.
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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5 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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6 * The library is free for all purposes without any express
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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7 * guarantee it works.
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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8 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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10 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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11 #include "tomcrypt.h"
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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12
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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13 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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14 @file rsa_make_key.c
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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15 RSA key generation, Tom St Denis
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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16 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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17
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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18 #ifdef MRSA
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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19
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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20 /**
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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21 Create an RSA key
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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22 @param prng An active PRNG state
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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23 @param wprng The index of the PRNG desired
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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24 @param size The size of the modulus (key size) desired (octets)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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25 @param e The "e" value (public key). e==65537 is a good choice
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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26 @param key [out] Destination of a newly created private key pair
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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27 @return CRYPT_OK if successful, upon error all allocated ram is freed
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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28 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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29 int rsa_make_key(prng_state *prng, int wprng, int size, long e, rsa_key *key)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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30 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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31 mp_int p, q, tmp1, tmp2, tmp3;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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32 int err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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33
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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34 LTC_ARGCHK(key != NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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35
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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36 if ((size < (MIN_RSA_SIZE/8)) || (size > (MAX_RSA_SIZE/8))) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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37 return CRYPT_INVALID_KEYSIZE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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38 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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39
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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40 if ((e < 3) || ((e & 1) == 0)) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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41 return CRYPT_INVALID_ARG;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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42 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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43
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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44 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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45 return err;
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46 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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47
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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48 if ((err = mp_init_multi(&p, &q, &tmp1, &tmp2, &tmp3, NULL)) != MP_OKAY) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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49 return mpi_to_ltc_error(err);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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50 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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51
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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52 /* make primes p and q (optimization provided by Wayne Scott) */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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53 if ((err = mp_set_int(&tmp3, e)) != MP_OKAY) { goto error; } /* tmp3 = e */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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54
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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55 /* make prime "p" */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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56 do {
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57 if ((err = rand_prime(&p, size*4, prng, wprng)) != CRYPT_OK) { goto done; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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58 if ((err = mp_sub_d(&p, 1, &tmp1)) != MP_OKAY) { goto error; } /* tmp1 = p-1 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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59 if ((err = mp_gcd(&tmp1, &tmp3, &tmp2)) != MP_OKAY) { goto error; } /* tmp2 = gcd(p-1, e) */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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60 } while (mp_cmp_d(&tmp2, 1) != 0); /* while e divides p-1 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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61
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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62 /* make prime "q" */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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63 do {
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64 if ((err = rand_prime(&q, size*4, prng, wprng)) != CRYPT_OK) { goto done; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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65 if ((err = mp_sub_d(&q, 1, &tmp1)) != MP_OKAY) { goto error; } /* tmp1 = q-1 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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66 if ((err = mp_gcd(&tmp1, &tmp3, &tmp2)) != MP_OKAY) { goto error; } /* tmp2 = gcd(q-1, e) */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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67 } while (mp_cmp_d(&tmp2, 1) != 0); /* while e divides q-1 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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68
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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69 /* tmp1 = lcm(p-1, q-1) */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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70 if ((err = mp_sub_d(&p, 1, &tmp2)) != MP_OKAY) { goto error; } /* tmp2 = p-1 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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71 /* tmp1 = q-1 (previous do/while loop) */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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72 if ((err = mp_lcm(&tmp1, &tmp2, &tmp1)) != MP_OKAY) { goto error; } /* tmp1 = lcm(p-1, q-1) */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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73
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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74 /* make key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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75 if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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76 &key->qP, &key->p, &key->q, NULL)) != MP_OKAY) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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77 goto error;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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78 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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79
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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80 if ((err = mp_set_int(&key->e, e)) != MP_OKAY) { goto error2; } /* key->e = e */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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81 if ((err = mp_invmod(&key->e, &tmp1, &key->d)) != MP_OKAY) { goto error2; } /* key->d = 1/e mod lcm(p-1,q-1) */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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82 if ((err = mp_mul(&p, &q, &key->N)) != MP_OKAY) { goto error2; } /* key->N = pq */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
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83
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Matt Johnston <matt@ucc.asn.au>
parents:
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84 /* optimize for CRT now */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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85 /* find d mod q-1 and d mod p-1 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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86 if ((err = mp_sub_d(&p, 1, &tmp1)) != MP_OKAY) { goto error2; } /* tmp1 = q-1 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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87 if ((err = mp_sub_d(&q, 1, &tmp2)) != MP_OKAY) { goto error2; } /* tmp2 = p-1 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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88 if ((err = mp_mod(&key->d, &tmp1, &key->dP)) != MP_OKAY) { goto error2; } /* dP = d mod p-1 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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89 if ((err = mp_mod(&key->d, &tmp2, &key->dQ)) != MP_OKAY) { goto error2; } /* dQ = d mod q-1 */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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90 if ((err = mp_invmod(&q, &p, &key->qP)) != MP_OKAY) { goto error2; } /* qP = 1/q mod p */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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91
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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92 if ((err = mp_copy(&p, &key->p)) != MP_OKAY) { goto error2; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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93 if ((err = mp_copy(&q, &key->q)) != MP_OKAY) { goto error2; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
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94
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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95 /* shrink ram required */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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diff changeset
96 if ((err = mp_shrink(&key->e)) != MP_OKAY) { goto error2; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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97 if ((err = mp_shrink(&key->d)) != MP_OKAY) { goto error2; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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98 if ((err = mp_shrink(&key->N)) != MP_OKAY) { goto error2; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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99 if ((err = mp_shrink(&key->dQ)) != MP_OKAY) { goto error2; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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100 if ((err = mp_shrink(&key->dP)) != MP_OKAY) { goto error2; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 if ((err = mp_shrink(&key->qP)) != MP_OKAY) { goto error2; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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102 if ((err = mp_shrink(&key->p)) != MP_OKAY) { goto error2; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 if ((err = mp_shrink(&key->q)) != MP_OKAY) { goto error2; }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
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104
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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105 /* set key type (in this case it's CRT optimized) */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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106 key->type = PK_PRIVATE;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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diff changeset
107
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Matt Johnston <matt@ucc.asn.au>
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108 /* return ok and free temps */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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109 err = CRYPT_OK;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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110 goto done;
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parents:
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111 error2:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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112 mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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113 &key->qP, &key->p, &key->q, NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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diff changeset
114 error:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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115 err = mpi_to_ltc_error(err);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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116 done:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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117 mp_clear_multi(&tmp3, &tmp2, &tmp1, &p, &q, NULL);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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118 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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119 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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120
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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121 #endif