Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_decode.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
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285
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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,
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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
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80 t = (t<<6)|c;
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81
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82 if (++y == 4) {
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83 if (z + g > *outlen) {
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84 return CRYPT_BUFFER_OVERFLOW;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
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 $ */