Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_encode.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
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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diff changeset
7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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diff changeset
11 #include "tomcrypt.h"
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12
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diff changeset
13 /*! \file pkcs_1_v1_5_encode.c
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14 *
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15 * PKCS #1 v1.5 Padding (Andreas Lange)
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16 */
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17
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18 #ifdef PKCS_1
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19
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20 /*! \brief PKCS #1 v1.5 encode.
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21 *
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22 * \param msg The data to encode
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23 * \param msglen The length of the data to encode (octets)
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24 * \param block_type Block type to use in padding (\sa ltc_pkcs_1_v1_5_blocks)
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25 * \param modulus_bitlen The bit length of the RSA modulus
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26 * \param prng An active PRNG state (only for LTC_PKCS_1_EME)
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27 * \param prng_idx The index of the PRNG desired (only for LTC_PKCS_1_EME)
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28 * \param out [out] The destination for the encoded data
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29 * \param outlen [in/out] The max size and resulting size of the encoded data
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30 *
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31 * \return CRYPT_OK if successful
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32 */
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33 int pkcs_1_v1_5_encode(const unsigned char *msg,
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34 unsigned long msglen,
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35 int block_type,
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36 unsigned long modulus_bitlen,
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37 prng_state *prng,
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38 int prng_idx,
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39 unsigned char *out,
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40 unsigned long *outlen)
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41 {
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42 unsigned long modulus_len, ps_len, i;
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43 unsigned char *ps;
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44 int result;
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45
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46 /* valid block_type? */
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47 if ((block_type != LTC_PKCS_1_EMSA) &&
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48 (block_type != LTC_PKCS_1_EME)) {
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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 if (block_type == LTC_PKCS_1_EME) { /* encryption padding, we need a valid PRNG */
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53 if ((result = prng_is_valid(prng_idx)) != CRYPT_OK) {
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54 return result;
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55 }
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56 }
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57
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58 modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0);
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59
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60 /* test message size */
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61 if ((msglen + 11) > modulus_len) {
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62 return CRYPT_PK_INVALID_SIZE;
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63 }
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64
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65 if (*outlen < modulus_len) {
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66 *outlen = modulus_len;
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67 result = CRYPT_BUFFER_OVERFLOW;
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68 goto bail;
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69 }
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70
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71 /* generate an octets string PS */
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72 ps = &out[2];
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73 ps_len = modulus_len - msglen - 3;
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74
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 if (block_type == LTC_PKCS_1_EME) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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76 /* now choose a random ps */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
77 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
78 result = CRYPT_ERROR_READPRNG;
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79 goto bail;
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Matt Johnston <matt@ucc.asn.au>
parents:
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80 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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81
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 /* transform zero bytes (if any) to non-zero random bytes */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 for (i = 0; i < ps_len; i++) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 while (ps[i] == 0) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 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
86 result = CRYPT_ERROR_READPRNG;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 goto bail;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 } else {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 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
93 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 /* 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
96 out[0] = 0x00;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 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
98 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
99 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
100 *outlen = modulus_len;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 result = CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 bail:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 return result;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 } /* 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
106
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
107 #endif /* #ifdef PKCS_1 */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_encode.c,v $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
110 /* $Revision: 1.2 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
111 /* $Date: 2006/11/01 09:12:06 $ */