Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_exptmod.c @ 1546:bb8eaa26bc93 fuzz
merge from main
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 26 Feb 2018 22:44:48 +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 rsa_exptmod.c |
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13 RSA PKCS exptmod, Tom St Denis |
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14 Added RSA blinding --nmav |
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15 */ |
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16 |
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17 #ifdef LTC_MRSA |
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18 |
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19 /** |
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20 Compute an RSA modular exponentiation |
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21 @param in The input data to send into RSA |
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22 @param inlen The length of the input (octets) |
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23 @param out [out] The destination |
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24 @param outlen [in/out] The max size and resulting size of the output |
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25 @param which Which exponent to use, e.g. PK_PRIVATE or PK_PUBLIC |
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26 @param key The RSA key to use |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int rsa_exptmod(const unsigned char *in, unsigned long inlen, |
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30 unsigned char *out, unsigned long *outlen, int which, |
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31 rsa_key *key) |
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32 { |
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33 void *tmp, *tmpa, *tmpb; |
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34 #ifdef LTC_RSA_BLINDING |
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35 void *rnd, *rndi /* inverse of rnd */; |
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36 #endif |
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37 unsigned long x; |
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38 int err, has_crt_parameters; |
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39 |
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40 LTC_ARGCHK(in != NULL); |
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41 LTC_ARGCHK(out != NULL); |
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42 LTC_ARGCHK(outlen != NULL); |
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43 LTC_ARGCHK(key != NULL); |
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44 |
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45 /* is the key of the right type for the operation? */ |
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46 if (which == PK_PRIVATE && (key->type != PK_PRIVATE)) { |
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47 return CRYPT_PK_NOT_PRIVATE; |
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48 } |
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49 |
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50 /* must be a private or public operation */ |
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51 if (which != PK_PRIVATE && which != PK_PUBLIC) { |
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52 return CRYPT_PK_INVALID_TYPE; |
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53 } |
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54 |
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55 /* init and copy into tmp */ |
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56 if ((err = mp_init_multi(&tmp, &tmpa, &tmpb, |
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57 #ifdef LTC_RSA_BLINDING |
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58 &rnd, &rndi, |
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59 #endif /* LTC_RSA_BLINDING */ |
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60 NULL)) != CRYPT_OK) |
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61 { return err; } |
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62 if ((err = mp_read_unsigned_bin(tmp, (unsigned char *)in, (int)inlen)) != CRYPT_OK) |
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63 { goto error; } |
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64 |
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65 |
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66 /* sanity check on the input */ |
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67 if (mp_cmp(key->N, tmp) == LTC_MP_LT) { |
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68 err = CRYPT_PK_INVALID_SIZE; |
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69 goto error; |
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70 } |
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71 |
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72 /* are we using the private exponent and is the key optimized? */ |
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73 if (which == PK_PRIVATE) { |
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74 #ifdef LTC_RSA_BLINDING |
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75 /* do blinding */ |
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76 err = mp_rand(rnd, mp_get_digit_count(key->N)); |
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77 if (err != CRYPT_OK) { |
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78 goto error; |
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79 } |
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80 |
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81 /* rndi = 1/rnd mod N */ |
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82 err = mp_invmod(rnd, key->N, rndi); |
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83 if (err != CRYPT_OK) { |
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84 goto error; |
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85 } |
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86 |
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87 /* rnd = rnd^e */ |
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88 err = mp_exptmod( rnd, key->e, key->N, rnd); |
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89 if (err != CRYPT_OK) { |
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90 goto error; |
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91 } |
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92 |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
93 /* tmp = tmp*rnd mod N */ |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
94 err = mp_mulmod( tmp, rnd, key->N, tmp); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
95 if (err != CRYPT_OK) { |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
96 goto error; |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
97 } |
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|
98 #endif /* LTC_RSA_BLINDING */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
99 |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
100 has_crt_parameters = (key->p != NULL) && (mp_get_digit_count(key->p) != 0) && |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
101 (key->q != NULL) && (mp_get_digit_count(key->q) != 0) && |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
102 (key->dP != NULL) && (mp_get_digit_count(key->dP) != 0) && |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
103 (key->dQ != NULL) && (mp_get_digit_count(key->dQ) != 0) && |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
104 (key->qP != NULL) && (mp_get_digit_count(key->qP) != 0); |
285
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|
105 |
1471
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
106 if (!has_crt_parameters) { |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
107 /* |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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108 * In case CRT optimization parameters are not provided, |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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109 * the private key is directly used to exptmod it |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
110 */ |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
111 if ((err = mp_exptmod(tmp, key->d, key->N, tmp)) != CRYPT_OK) { goto error; } |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
112 } else { |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
113 /* tmpa = tmp^dP mod p */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
114 if ((err = mp_exptmod(tmp, key->dP, key->p, tmpa)) != CRYPT_OK) { goto error; } |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
115 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
116 /* tmpb = tmp^dQ mod q */ |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
117 if ((err = mp_exptmod(tmp, key->dQ, key->q, tmpb)) != CRYPT_OK) { goto error; } |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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|
118 |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
119 /* tmp = (tmpa - tmpb) * qInv (mod p) */ |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
120 if ((err = mp_sub(tmpa, tmpb, tmp)) != CRYPT_OK) { goto error; } |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
121 if ((err = mp_mulmod(tmp, key->qP, key->p, tmp)) != CRYPT_OK) { goto error; } |
285
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|
122 |
1471
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
123 /* tmp = tmpb + q * tmp */ |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
124 if ((err = mp_mul(tmp, key->q, tmp)) != CRYPT_OK) { goto error; } |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
125 if ((err = mp_add(tmp, tmpb, tmp)) != CRYPT_OK) { goto error; } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
126 } |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
127 |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
128 #ifdef LTC_RSA_BLINDING |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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129 /* unblind */ |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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130 err = mp_mulmod( tmp, rndi, key->N, tmp); |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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131 if (err != CRYPT_OK) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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132 goto error; |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
133 } |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
134 #endif |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
135 |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
136 #ifdef LTC_RSA_CRT_HARDENING |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
137 if (has_crt_parameters) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
138 if ((err = mp_exptmod(tmp, key->e, key->N, tmpa)) != CRYPT_OK) { goto error; } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
139 if ((err = mp_read_unsigned_bin(tmpb, (unsigned char *)in, (int)inlen)) != CRYPT_OK) { goto error; } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
140 if (mp_cmp(tmpa, tmpb) != LTC_MP_EQ) { err = CRYPT_ERROR; goto error; } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
141 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
142 #endif |
285
1b9e69c058d2
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changeset
|
143 } else { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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|
144 /* exptmod it */ |
382
0cbe8f6dbf9e
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285
diff
changeset
|
145 if ((err = mp_exptmod(tmp, key->e, key->N, tmp)) != CRYPT_OK) { goto error; } |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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|
146 } |
1b9e69c058d2
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diff
changeset
|
147 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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changeset
|
148 /* read it back */ |
382
0cbe8f6dbf9e
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285
diff
changeset
|
149 x = (unsigned long)mp_unsigned_bin_size(key->N); |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff
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|
150 if (x > *outlen) { |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
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285
diff
changeset
|
151 *outlen = x; |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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changeset
|
152 err = CRYPT_BUFFER_OVERFLOW; |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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285
diff
changeset
|
153 goto error; |
285
1b9e69c058d2
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|
154 } |
1b9e69c058d2
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diff
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|
155 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff
changeset
|
156 /* this should never happen ... */ |
382
0cbe8f6dbf9e
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285
diff
changeset
|
157 if (mp_unsigned_bin_size(tmp) > mp_unsigned_bin_size(key->N)) { |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff
changeset
|
158 err = CRYPT_ERROR; |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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285
diff
changeset
|
159 goto error; |
285
1b9e69c058d2
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diff
changeset
|
160 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff
changeset
|
161 *outlen = x; |
1b9e69c058d2
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diff
changeset
|
162 |
1b9e69c058d2
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parents:
diff
changeset
|
163 /* convert it */ |
1b9e69c058d2
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diff
changeset
|
164 zeromem(out, x); |
382
0cbe8f6dbf9e
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285
diff
changeset
|
165 if ((err = mp_to_unsigned_bin(tmp, out+(x-mp_unsigned_bin_size(tmp)))) != CRYPT_OK) { goto error; } |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff
changeset
|
166 |
1b9e69c058d2
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parents:
diff
changeset
|
167 /* clean up and return */ |
1b9e69c058d2
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parents:
diff
changeset
|
168 err = CRYPT_OK; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
169 error: |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
170 mp_clear_multi( |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
171 #ifdef LTC_RSA_BLINDING |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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|
172 rndi, rnd, |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
173 #endif /* LTC_RSA_BLINDING */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
174 tmpb, tmpa, tmp, NULL); |
285
1b9e69c058d2
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|
175 return err; |
1b9e69c058d2
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parents:
diff
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|
176 } |
1b9e69c058d2
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parents:
diff
changeset
|
177 |
1b9e69c058d2
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diff
changeset
|
178 #endif |
1b9e69c058d2
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parents:
diff
changeset
|
179 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
180 /* ref: $Format:%D$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
181 /* git commit: $Format:%H$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
182 /* commit time: $Format:%ai$ */ |