Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_encode.c @ 1005:f19be6a28d7e

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merge
author Matt Johnston <matt@ucc.asn.au>
date Wed, 28 Jan 2015 22:49:40 +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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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 * Tom St Denis, [email protected], http://libtomcrypt.com
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diff changeset
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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diff changeset
14 *
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diff changeset
15 * PKCS #1 v1.5 Padding (Andreas Lange)
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16 */
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17
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diff changeset
18 #ifdef PKCS_1
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19
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diff changeset
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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Matt Johnston <matt@ucc.asn.au>
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diff changeset
34 unsigned long msglen,
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35 int block_type,
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Matt Johnston <matt@ucc.asn.au>
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36 unsigned long modulus_bitlen,
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Matt Johnston <matt@ucc.asn.au>
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37 prng_state *prng,
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Matt Johnston <matt@ucc.asn.au>
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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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Matt Johnston <matt@ucc.asn.au>
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diff changeset
52 if (block_type == LTC_PKCS_1_EME) { /* encryption padding, we need a valid PRNG */
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Matt Johnston <matt@ucc.asn.au>
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53 if ((result = prng_is_valid(prng_idx)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
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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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diff changeset
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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parents:
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63 }
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64
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65 if (*outlen < modulus_len) {
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parents:
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66 *outlen = modulus_len;
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diff changeset
67 result = CRYPT_BUFFER_OVERFLOW;
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parents:
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68 goto bail;
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Matt Johnston <matt@ucc.asn.au>
parents:
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69 }
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parents:
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70
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parents:
diff changeset
71 /* generate an octets string PS */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72 ps = &out[2];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
73 ps_len = modulus_len - msglen - 3;
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Matt Johnston <matt@ucc.asn.au>
parents:
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74
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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:
diff changeset
76 /* now choose a random ps */
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Matt Johnston <matt@ucc.asn.au>
parents:
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;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 goto bail;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 /* transform zero bytes (if any) to non-zero random bytes */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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 $ */