Mercurial > dropbear
annotate libtomcrypt/src/pk/dsa/dsa_encrypt_key.c @ 1763:c05b76c541c9
Added signature for changeset 5879c5829e85
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 29 Oct 2020 21:40:34 +0800 |
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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 dsa_encrypt_key.c |
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13 DSA Crypto, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_MDSA |
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17 |
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18 /** |
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19 Encrypt a symmetric key with DSA |
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20 @param in The symmetric key you want to encrypt |
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21 @param inlen The length of the key to encrypt (octets) |
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22 @param out [out] The destination for 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 prng An active PRNG state |
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25 @param wprng The index of the PRNG you wish to use |
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26 @param hash The index of the hash you want to use |
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27 @param key The DSA key you want to encrypt to |
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28 @return CRYPT_OK if successful |
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29 */ |
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30 int dsa_encrypt_key(const unsigned char *in, unsigned long inlen, |
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31 unsigned char *out, unsigned long *outlen, |
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32 prng_state *prng, int wprng, int hash, |
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33 dsa_key *key) |
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34 { |
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35 unsigned char *expt, *skey; |
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36 void *g_pub, *g_priv; |
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37 unsigned long x, y; |
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38 int err; |
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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 /* check that wprng/cipher/hash are not invalid */ |
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46 if ((err = prng_is_valid(wprng)) != CRYPT_OK) { |
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47 return err; |
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48 } |
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49 |
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50 if ((err = hash_is_valid(hash)) != CRYPT_OK) { |
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51 return err; |
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52 } |
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53 |
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54 if (inlen > hash_descriptor[hash].hashsize) { |
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55 return CRYPT_INVALID_HASH; |
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56 } |
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57 |
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58 /* make a random key and export the public copy */ |
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59 if ((err = mp_init_multi(&g_pub, &g_priv, NULL)) != CRYPT_OK) { |
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60 return err; |
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61 } |
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62 |
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63 expt = XMALLOC(mp_unsigned_bin_size(key->p) + 1); |
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64 skey = XMALLOC(MAXBLOCKSIZE); |
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65 if (expt == NULL || skey == NULL) { |
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66 if (expt != NULL) { |
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67 XFREE(expt); |
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68 } |
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69 if (skey != NULL) { |
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70 XFREE(skey); |
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71 } |
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72 mp_clear_multi(g_pub, g_priv, NULL); |
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73 return CRYPT_MEM; |
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74 } |
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75 |
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76 /* make a random g_priv, g_pub = g^x pair |
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77 private key x should be in range: 1 <= x <= q-1 (see FIPS 186-4 B.1.2) |
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78 */ |
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79 if ((err = rand_bn_upto(g_priv, key->q, prng, wprng)) != CRYPT_OK) { |
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80 goto LBL_ERR; |
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81 } |
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82 |
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parents:
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83 /* compute y */ |
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84 if ((err = mp_exptmod(key->g, g_priv, key->p, g_pub)) != CRYPT_OK) { |
0cbe8f6dbf9e
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85 goto LBL_ERR; |
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86 } |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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87 |
382
0cbe8f6dbf9e
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parents:
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88 /* make random key */ |
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89 x = mp_unsigned_bin_size(key->p) + 1; |
0cbe8f6dbf9e
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90 if ((err = dsa_shared_secret(g_priv, key->y, key, expt, &x)) != CRYPT_OK) { |
0cbe8f6dbf9e
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91 goto LBL_ERR; |
0cbe8f6dbf9e
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parents:
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92 } |
0cbe8f6dbf9e
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93 |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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94 y = MAXBLOCKSIZE; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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95 if ((err = hash_memory(hash, expt, x, skey, &y)) != CRYPT_OK) { |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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96 goto LBL_ERR; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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97 } |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
1435
diff
changeset
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98 |
382
0cbe8f6dbf9e
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parents:
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99 /* Encrypt key */ |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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100 for (x = 0; x < inlen; x++) { |
0cbe8f6dbf9e
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101 skey[x] ^= in[x]; |
0cbe8f6dbf9e
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parents:
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102 } |
0cbe8f6dbf9e
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parents:
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103 |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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104 err = der_encode_sequence_multi(out, outlen, |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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105 LTC_ASN1_OBJECT_IDENTIFIER, hash_descriptor[hash].OIDlen, hash_descriptor[hash].OID, |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
106 LTC_ASN1_INTEGER, 1UL, g_pub, |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
107 LTC_ASN1_OCTET_STRING, inlen, skey, |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
108 LTC_ASN1_EOL, 0UL, NULL); |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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|
109 |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
110 LBL_ERR: |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
111 #ifdef LTC_CLEAN_STACK |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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changeset
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112 /* clean up */ |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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113 zeromem(expt, mp_unsigned_bin_size(key->p) + 1); |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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114 zeromem(skey, MAXBLOCKSIZE); |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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115 #endif |
0cbe8f6dbf9e
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116 |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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117 XFREE(skey); |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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118 XFREE(expt); |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
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119 |
382
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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120 mp_clear_multi(g_pub, g_priv, NULL); |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
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121 return err; |
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Matt Johnston <matt@ucc.asn.au>
parents:
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122 } |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
123 |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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124 #endif |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
125 /* ref: $Format:%D$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
126 /* 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
|
127 /* commit time: $Format:%ai$ */ |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
128 |