Mercurial > dropbear
annotate libtomcrypt/src/pk/katja/katja_exptmod.c @ 1758:1365661f6be6
Disable stderr output for fuzzer by default
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 24 Oct 2020 22:40:08 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file katja_exptmod.c |
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13 Katja PKCS-style exptmod, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_MKAT |
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17 |
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18 /** |
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19 Compute an RSA modular exponentiation |
382
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20 @param in The input data to send into RSA |
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21 @param inlen The length of the input (octets) |
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22 @param out [out] The destination |
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23 @param outlen [in/out] The max size and resulting size of the output |
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24 @param which Which exponent to use, e.g. PK_PRIVATE or PK_PUBLIC |
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25 @param key The RSA key to use |
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26 @return CRYPT_OK if successful |
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27 */ |
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28 int katja_exptmod(const unsigned char *in, unsigned long inlen, |
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29 unsigned char *out, unsigned long *outlen, int which, |
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30 katja_key *key) |
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31 { |
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32 void *tmp, *tmpa, *tmpb; |
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33 unsigned long x; |
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34 int err; |
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35 |
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36 LTC_ARGCHK(in != NULL); |
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37 LTC_ARGCHK(out != NULL); |
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38 LTC_ARGCHK(outlen != NULL); |
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39 LTC_ARGCHK(key != NULL); |
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40 |
382
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41 /* is the key of the right type for the operation? */ |
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42 if (which == PK_PRIVATE && (key->type != PK_PRIVATE)) { |
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43 return CRYPT_PK_NOT_PRIVATE; |
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44 } |
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45 |
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46 /* must be a private or public operation */ |
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47 if (which != PK_PRIVATE && which != PK_PUBLIC) { |
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48 return CRYPT_PK_INVALID_TYPE; |
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49 } |
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50 |
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51 /* init and copy into tmp */ |
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52 if ((err = mp_init_multi(&tmp, &tmpa, &tmpb, NULL)) != CRYPT_OK) { return err; } |
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53 if ((err = mp_read_unsigned_bin(tmp, (unsigned char *)in, (int)inlen)) != CRYPT_OK) { goto error; } |
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54 |
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55 /* sanity check on the input */ |
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56 if (mp_cmp(key->N, tmp) == LTC_MP_LT) { |
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57 err = CRYPT_PK_INVALID_SIZE; |
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58 goto done; |
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59 } |
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60 |
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61 /* are we using the private exponent and is the key optimized? */ |
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62 if (which == PK_PRIVATE) { |
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63 /* tmpa = tmp^dP mod p */ |
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64 if ((err = mp_exptmod(tmp, key->dP, key->p, tmpa)) != CRYPT_OK) { goto error; } |
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65 |
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66 /* tmpb = tmp^dQ mod q */ |
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67 if ((err = mp_exptmod(tmp, key->dQ, key->q, tmpb)) != CRYPT_OK) { goto error; } |
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68 |
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69 /* tmp = (tmpa - tmpb) * qInv (mod p) */ |
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70 if ((err = mp_sub(tmpa, tmpb, tmp)) != CRYPT_OK) { goto error; } |
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71 if ((err = mp_mulmod(tmp, key->qP, key->p, tmp)) != CRYPT_OK) { goto error; } |
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72 |
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73 /* tmp = tmpb + q * tmp */ |
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74 if ((err = mp_mul(tmp, key->q, tmp)) != CRYPT_OK) { goto error; } |
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75 if ((err = mp_add(tmp, tmpb, tmp)) != CRYPT_OK) { goto error; } |
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76 } else { |
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77 /* exptmod it */ |
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78 if ((err = mp_exptmod(tmp, key->N, key->N, tmp)) != CRYPT_OK) { goto error; } |
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79 } |
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80 |
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81 /* read it back */ |
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82 x = (unsigned long)mp_unsigned_bin_size(key->N); |
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83 if (x > *outlen) { |
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84 *outlen = x; |
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85 err = CRYPT_BUFFER_OVERFLOW; |
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86 goto done; |
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87 } |
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88 |
0cbe8f6dbf9e
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89 /* this should never happen ... */ |
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90 if (mp_unsigned_bin_size(tmp) > mp_unsigned_bin_size(key->N)) { |
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91 err = CRYPT_ERROR; |
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92 goto done; |
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93 } |
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94 *outlen = x; |
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95 |
0cbe8f6dbf9e
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96 /* convert it */ |
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97 zeromem(out, x); |
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98 if ((err = mp_to_unsigned_bin(tmp, out+(x-mp_unsigned_bin_size(tmp)))) != CRYPT_OK) { goto error; } |
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99 |
0cbe8f6dbf9e
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100 /* clean up and return */ |
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101 err = CRYPT_OK; |
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102 goto done; |
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103 error: |
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104 done: |
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Matt Johnston <matt@ucc.asn.au>
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105 mp_clear_multi(tmp, tmpa, tmpb, NULL); |
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106 return err; |
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parents:
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107 } |
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parents:
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108 |
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109 #endif |
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110 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
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111 /* ref: $Format:%D$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
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112 /* git commit: $Format:%H$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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113 /* commit time: $Format:%ai$ */ |