Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_decode.c @ 459:f4addc06745b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Make sure declarations of variables are at the top of function, pointed out by Alexey Rusakov.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 11 Sep 2007 12:00:18 +0000
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_decode.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 decode.
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21 *
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22 * @param msg The encoded data to decode
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23 * @param msglen The length of the encoded data (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 out [out] Destination of decoding
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27 * @param outlen [in/out] The max size and resulting size of the decoding
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28 * @param is_valid [out] Boolean whether the padding was valid
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29 *
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30 * @return CRYPT_OK if successful (even if invalid)
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31 */
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diff changeset
32 int pkcs_1_v1_5_decode(const unsigned char *msg,
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diff changeset
33 unsigned long msglen,
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diff changeset
34 int block_type,
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diff changeset
35 unsigned long modulus_bitlen,
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diff changeset
36 unsigned char *out,
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
37 unsigned long *outlen,
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diff changeset
38 int *is_valid)
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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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41 int result;
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42
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43 /* default to invalid packet */
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44 *is_valid = 0;
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45
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diff changeset
46 modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0);
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47
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48 /* test message size */
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49
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50 if ((msglen > modulus_len) || (modulus_len < 11)) {
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51 return CRYPT_PK_INVALID_SIZE;
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52 }
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53
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54 /* separate encoded message */
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55
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56 if ((msg[0] != 0x00) || (msg[1] != (unsigned char)block_type)) {
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57 result = CRYPT_INVALID_PACKET;
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58 goto bail;
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59 }
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60
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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61 if (block_type == LTC_PKCS_1_EME) {
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diff changeset
62 for (i = 2; i < modulus_len; i++) {
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diff changeset
63 /* separator */
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diff changeset
64 if (msg[i] == 0x00) { break; }
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65 }
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parents:
diff changeset
66 ps_len = i++ - 2;
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parents:
diff changeset
67
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
68 if ((i >= modulus_len) || (ps_len < 8)) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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69 /* There was no octet with hexadecimal value 0x00 to separate ps from m,
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parents:
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70 * or the length of ps is less than 8 octets.
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parents:
diff changeset
71 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72 result = CRYPT_INVALID_PACKET;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
73 goto bail;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 } else {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 for (i = 2; i < modulus_len - 1; i++) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 if (msg[i] != 0xFF) { break; }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 /* separator check */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 if (msg[i] != 0) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 /* There was no octet with hexadecimal value 0x00 to separate ps from m. */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 result = CRYPT_INVALID_PACKET;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 goto bail;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 ps_len = i - 2;
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 if (*outlen < (msglen - (2 + ps_len + 1))) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 *outlen = msglen - (2 + ps_len + 1);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 result = CRYPT_BUFFER_OVERFLOW;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 goto bail;
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
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 *outlen = (msglen - (2 + ps_len + 1));
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 XMEMCPY(out, &msg[2 + ps_len + 1], *outlen);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 /* valid packet */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 *is_valid = 1;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 result = CRYPT_OK;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 bail:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 return result;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 } /* pkcs_1_v1_5_decode */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 #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
107
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_v1_5_decode.c,v $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109 /* $Revision: 1.5 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
110 /* $Date: 2006/12/16 17:41:21 $ */