Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_exptmod.c @ 1930:299f4f19ba19
Add /usr/sbin and /sbin to default root PATH
When dropbear is used in a very restricted environment (such as in a
initrd), the default user shell is often also very restricted
and doesn't take care of setting the PATH so the user ends up
with the PATH set by dropbear. Unfortunately, dropbear always
sets "/usr/bin:/bin" as default PATH even for the root user
which should have /usr/sbin and /sbin too.
For a concrete instance of this problem, see the "Remote Unlocking"
section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/
It speaks of a bug in the initramfs script because it's written "blkid"
instead of "/sbin/blkid"... this is just because the scripts from the
initramfs do not expect to have a PATH without the sbin directories and
because dropbear is not setting the PATH appropriately for the root user.
I'm thus suggesting to use the attached patch to fix this misbehaviour (I
did not test it, but it's easy enough). It might seem anecdotic but
multiple Kali users have been bitten by this.
From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author | Raphael Hertzog <hertzog@debian.org> |
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date | Mon, 09 Jul 2018 16:27:53 +0200 |
parents | 6dba84798cd5 |
children |
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); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
89 if (err != CRYPT_OK) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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|
90 goto error; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
91 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
92 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
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diff
changeset
|
93 /* tmp = tmp*rnd mod N */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
94 err = mp_mulmod( tmp, rnd, key->N, tmp); |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
95 if (err != CRYPT_OK) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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|
96 goto error; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
97 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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|
98 #endif /* LTC_RSA_BLINDING */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
99 |
6dba84798cd5
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) && |
6dba84798cd5
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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diff
changeset
|
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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diff
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|
104 (key->qP != NULL) && (mp_get_digit_count(key->qP) != 0); |
285
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changeset
|
105 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
106 if (!has_crt_parameters) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
107 /* |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
108 * In case CRT optimization parameters are not provided, |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
109 * the private key is directly used to exptmod it |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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|
110 */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
111 if ((err = mp_exptmod(tmp, key->d, key->N, tmp)) != CRYPT_OK) { goto error; } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
112 } else { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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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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diff
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|
114 if ((err = mp_exptmod(tmp, key->dP, key->p, tmpa)) != CRYPT_OK) { goto error; } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
115 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
116 /* tmpb = tmp^dQ mod q */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
117 if ((err = mp_exptmod(tmp, key->dQ, key->q, tmpb)) != CRYPT_OK) { goto error; } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
118 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
119 /* tmp = (tmpa - tmpb) * qInv (mod p) */ |
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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|
120 if ((err = mp_sub(tmpa, tmpb, tmp)) != CRYPT_OK) { goto error; } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
121 if ((err = mp_mulmod(tmp, key->qP, key->p, tmp)) != CRYPT_OK) { goto error; } |
285
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
122 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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changeset
|
123 /* tmp = tmpb + q * tmp */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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changeset
|
124 if ((err = mp_mul(tmp, key->q, tmp)) != CRYPT_OK) { goto error; } |
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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|
125 if ((err = mp_add(tmp, tmpb, tmp)) != CRYPT_OK) { 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
|
126 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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changeset
|
127 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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changeset
|
128 #ifdef LTC_RSA_BLINDING |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
129 /* unblind */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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|
130 err = mp_mulmod( tmp, rndi, key->N, tmp); |
6dba84798cd5
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; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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|
133 } |
6dba84798cd5
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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diff
changeset
|
135 |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
136 #ifdef LTC_RSA_CRT_HARDENING |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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changeset
|
137 if (has_crt_parameters) { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
|
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
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
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
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
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>
parents:
1435
diff
changeset
|
141 } |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
142 #endif |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
143 } else { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
144 /* exptmod it */ |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
146 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
147 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
148 /* read it back */ |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
150 if (x > *outlen) { |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
151 *outlen = x; |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
152 err = CRYPT_BUFFER_OVERFLOW; |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
153 goto error; |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff
changeset
|
154 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
155 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff
changeset
|
156 /* this should never happen ... */ |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
158 err = CRYPT_ERROR; |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
159 goto error; |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
160 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
161 *outlen = x; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff
changeset
|
162 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
163 /* convert it */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
164 zeromem(out, x); |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents:
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)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
166 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff
changeset
|
167 /* clean up and return */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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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1435
diff
changeset
|
171 #ifdef LTC_RSA_BLINDING |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
172 rndi, rnd, |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
changeset
|
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
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
175 return err; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
176 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
177 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
178 #endif |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff
changeset
|
179 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
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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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parents:
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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: $Format:%ai$ */ |