Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_encode.c @ 1716:6ea18ca8fc03

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Delay seedrandom until connections
author Matt Johnston <matt@ucc.asn.au>
date Mon, 15 Jun 2020 22:24:34 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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diff changeset
2 *
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diff changeset
3 * LibTomCrypt is a library that provides various cryptographic
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diff changeset
4 * algorithms in a highly modular and flexible manner.
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diff changeset
5 *
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diff changeset
6 * The library is free for all purposes without any express
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diff changeset
7 * guarantee it works.
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diff changeset
8 */
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diff changeset
9 #include "tomcrypt.h"
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10
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diff changeset
11 /*! \file pkcs_1_v1_5_encode.c
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12 *
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
13 * PKCS #1 v1.5 Padding (Andreas Lange)
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14 */
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15
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_PKCS_1
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17
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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18 /*! \brief PKCS #1 v1.5 encode.
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19 *
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20 * \param msg The data to encode
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21 * \param msglen The length of the data to encode (octets)
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22 * \param block_type Block type to use in padding (\sa ltc_pkcs_1_v1_5_blocks)
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23 * \param modulus_bitlen The bit length of the RSA modulus
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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24 * \param prng An active PRNG state (only for LTC_PKCS_1_EME)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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25 * \param prng_idx The index of the PRNG desired (only for LTC_PKCS_1_EME)
382
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26 * \param out [out] The destination for the encoded data
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27 * \param outlen [in/out] The max size and resulting size of the encoded data
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28 *
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29 * \return CRYPT_OK if successful
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30 */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
31 int pkcs_1_v1_5_encode(const unsigned char *msg,
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32 unsigned long msglen,
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33 int block_type,
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34 unsigned long modulus_bitlen,
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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35 prng_state *prng,
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36 int prng_idx,
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
37 unsigned char *out,
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38 unsigned long *outlen)
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diff changeset
39 {
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diff changeset
40 unsigned long modulus_len, ps_len, i;
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diff changeset
41 unsigned char *ps;
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42 int result;
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43
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44 /* valid block_type? */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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45 if ((block_type != LTC_PKCS_1_EMSA) &&
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
46 (block_type != LTC_PKCS_1_EME)) {
382
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47 return CRYPT_PK_INVALID_PADDING;
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48 }
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49
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
50 if (block_type == LTC_PKCS_1_EME) { /* encryption padding, we need a valid PRNG */
382
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51 if ((result = prng_is_valid(prng_idx)) != CRYPT_OK) {
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52 return result;
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53 }
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54 }
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55
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56 modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0);
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57
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diff changeset
58 /* test message size */
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59 if ((msglen + 11) > modulus_len) {
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60 return CRYPT_PK_INVALID_SIZE;
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61 }
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62
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63 if (*outlen < modulus_len) {
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diff changeset
64 *outlen = modulus_len;
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diff changeset
65 result = CRYPT_BUFFER_OVERFLOW;
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parents:
diff changeset
66 goto bail;
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parents:
diff changeset
67 }
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parents:
diff changeset
68
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parents:
diff changeset
69 /* generate an octets string PS */
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parents:
diff changeset
70 ps = &out[2];
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parents:
diff changeset
71 ps_len = modulus_len - msglen - 3;
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parents:
diff changeset
72
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
73 if (block_type == LTC_PKCS_1_EME) {
382
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74 /* now choose a random ps */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 if (prng_descriptor[prng_idx].read(ps, ps_len, prng) != ps_len) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 result = CRYPT_ERROR_READPRNG;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 goto bail;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 /* transform zero bytes (if any) to non-zero random bytes */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 for (i = 0; i < ps_len; i++) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 while (ps[i] == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 if (prng_descriptor[prng_idx].read(&ps[i], 1, prng) != 1) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 result = CRYPT_ERROR_READPRNG;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 goto bail;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 } else {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 XMEMSET(ps, 0xFF, ps_len);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 /* create string of length modulus_len */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 out[0] = 0x00;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 out[1] = (unsigned char)block_type; /* block_type 1 or 2 */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 out[2 + ps_len] = 0x00;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 XMEMCPY(&out[2 + ps_len + 1], msg, msglen);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 *outlen = modulus_len;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 result = CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 bail:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 return result;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 } /* pkcs_1_v1_5_encode */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
105 #endif /* #ifdef LTC_PKCS_1 */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
107 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
108 /* 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
109 /* commit time: $Format:%ai$ */