Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_encrypt_key.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
children
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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_encrypt_key.c
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13 RSA PKCS #1 encryption, Tom St Denis and Andreas Lange
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14 */
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15
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16 #ifdef LTC_MRSA
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17
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18 /**
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19 (PKCS #1 v2.0) OAEP pad then encrypt
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20 @param in The plaintext
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21 @param inlen The length of the plaintext (octets)
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22 @param out [out] The ciphertext
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23 @param outlen [in/out] The max size and resulting size of the ciphertext
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24 @param lparam The system "lparam" for the encryption
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25 @param lparamlen The length of lparam (octets)
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26 @param prng An active PRNG
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27 @param prng_idx The index of the desired prng
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28 @param hash_idx The index of the desired hash
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29 @param padding Type of padding (LTC_PKCS_1_OAEP or LTC_PKCS_1_V1_5)
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30 @param key The RSA key to encrypt to
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31 @return CRYPT_OK if successful
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32 */
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33 int rsa_encrypt_key_ex(const unsigned char *in, unsigned long inlen,
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34 unsigned char *out, unsigned long *outlen,
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35 const unsigned char *lparam, unsigned long lparamlen,
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36 prng_state *prng, int prng_idx, int hash_idx, int padding, rsa_key *key)
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37 {
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38 unsigned long modulus_bitlen, modulus_bytelen, x;
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39 int err;
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40
285
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41 LTC_ARGCHK(in != NULL);
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42 LTC_ARGCHK(out != NULL);
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43 LTC_ARGCHK(outlen != NULL);
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44 LTC_ARGCHK(key != NULL);
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45
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46 /* valid padding? */
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47 if ((padding != LTC_PKCS_1_V1_5) &&
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48 (padding != LTC_PKCS_1_OAEP)) {
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49 return CRYPT_PK_INVALID_PADDING;
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50 }
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51
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52 /* valid prng? */
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53 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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54 return err;
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55 }
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56
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57 if (padding == LTC_PKCS_1_OAEP) {
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58 /* valid hash? */
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59 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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60 return err;
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61 }
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62 }
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63
285
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64 /* get modulus len in bits */
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65 modulus_bitlen = mp_count_bits( (key->N));
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66
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67 /* outlen must be at least the size of the modulus */
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68 modulus_bytelen = mp_unsigned_bin_size( (key->N));
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69 if (modulus_bytelen > *outlen) {
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70 *outlen = modulus_bytelen;
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71 return CRYPT_BUFFER_OVERFLOW;
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72 }
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73
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74 if (padding == LTC_PKCS_1_OAEP) {
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75 /* OAEP pad the key */
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76 x = *outlen;
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77 if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
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78 lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
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79 out, &x)) != CRYPT_OK) {
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80 return err;
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81 }
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82 } else {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 /* PKCS #1 v1.5 pad the key */
382
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84 x = *outlen;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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85 if ((err = pkcs_1_v1_5_encode(in, inlen, LTC_PKCS_1_EME,
382
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86 modulus_bitlen, prng, prng_idx,
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87 out, &x)) != CRYPT_OK) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
88 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
89 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
90 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
91
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
92 /* rsa exptmod the OAEP or PKCS #1 v1.5 pad */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
93 return ltc_mp.rsa_me(out, x, out, outlen, PK_PUBLIC, key);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
96 #endif /* LTC_MRSA */
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
98 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
99 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
100 /* commit time: $Format:%ai$ */