Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_decode.c @ 739:d44325108d0e kexguess

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first_kex_packet_follows working, needs tidying
author Matt Johnston <matt@ucc.asn.au>
date Fri, 29 Mar 2013 20:44:13 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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285
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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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7 * guarantee it works.
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8 *
382
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
285
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file base64_decode.c
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15 Compliant base64 code donated by Wayne Scott ([email protected])
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16 */
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17
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18
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19 #ifdef BASE64
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20
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21 static const unsigned char map[256] = {
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22 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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23 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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24 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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25 255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
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26 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
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27 255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
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28 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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29 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
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30 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
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31 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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32 49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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33 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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34 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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35 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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36 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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37 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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38 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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39 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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40 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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41 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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42 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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43 255, 255, 255, 255 };
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44
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45 /**
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46 base64 decode a block of memory
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47 @param in The base64 data to decode
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48 @param inlen The length of the base64 data
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49 @param out [out] The destination of the binary decoded data
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50 @param outlen [in/out] The max size and resulting size of the decoded data
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51 @return CRYPT_OK if successful
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52 */
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53 int base64_decode(const unsigned char *in, unsigned long inlen,
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54 unsigned char *out, unsigned long *outlen)
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55 {
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56 unsigned long t, x, y, z;
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57 unsigned char c;
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58 int g;
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59
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60 LTC_ARGCHK(in != NULL);
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61 LTC_ARGCHK(out != NULL);
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62 LTC_ARGCHK(outlen != NULL);
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63
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64 g = 3;
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65 for (x = y = z = t = 0; x < inlen; x++) {
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66 c = map[in[x]&0xFF];
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67 if (c == 255) continue;
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68 /* the final = symbols are read and used to trim the remaining bytes */
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69 if (c == 254) {
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70 c = 0;
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71 /* prevent g < 0 which would potentially allow an overflow later */
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72 if (--g < 0) {
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73 return CRYPT_INVALID_PACKET;
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74 }
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75 } else if (g != 3) {
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76 /* we only allow = to be at the end */
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77 return CRYPT_INVALID_PACKET;
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78 }
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79
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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80 t = (t<<6)|c;
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81
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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82 if (++y == 4) {
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Matt Johnston <matt@ucc.asn.au>
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83 if (z + g > *outlen) {
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Matt Johnston <matt@ucc.asn.au>
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84 return CRYPT_BUFFER_OVERFLOW;
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Matt Johnston <matt@ucc.asn.au>
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85 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 out[z++] = (unsigned char)((t>>16)&255);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 if (g > 1) out[z++] = (unsigned char)((t>>8)&255);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 if (g > 2) out[z++] = (unsigned char)(t&255);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 y = t = 0;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 if (y != 0) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 return CRYPT_INVALID_PACKET;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 *outlen = z;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 /* $Source: /cvs/libtom/libtomcrypt/src/misc/base64/base64_decode.c,v $ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
103 /* $Revision: 1.4 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
104 /* $Date: 2006/03/31 14:15:35 $ */