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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 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.org |
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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 der_encode_ia5_string.c |
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15 ASN.1 DER, encode a IA5 STRING, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef LTC_DER |
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19 |
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20 /** |
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21 Store an IA5 STRING |
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22 @param in The array of IA5 to store (one per char) |
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23 @param inlen The number of IA5 to store |
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24 @param out [out] The destination for the DER encoded IA5 STRING |
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25 @param outlen [in/out] The max size and resulting size of the DER IA5 STRING |
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26 @return CRYPT_OK if successful |
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27 */ |
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28 int der_encode_ia5_string(const unsigned char *in, unsigned long inlen, |
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29 unsigned char *out, unsigned long *outlen) |
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30 { |
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31 unsigned long x, y, len; |
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32 int err; |
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33 |
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34 LTC_ARGCHK(in != NULL); |
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35 LTC_ARGCHK(out != NULL); |
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36 LTC_ARGCHK(outlen != NULL); |
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37 |
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38 /* get the size */ |
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39 if ((err = der_length_ia5_string(in, inlen, &len)) != CRYPT_OK) { |
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40 return err; |
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41 } |
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42 |
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43 /* too big? */ |
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44 if (len > *outlen) { |
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45 return CRYPT_BUFFER_OVERFLOW; |
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46 } |
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47 |
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48 /* encode the header+len */ |
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49 x = 0; |
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50 out[x++] = 0x16; |
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51 if (inlen < 128) { |
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52 out[x++] = inlen; |
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53 } else if (inlen < 256) { |
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54 out[x++] = 0x81; |
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55 out[x++] = inlen; |
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56 } else if (inlen < 65536UL) { |
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57 out[x++] = 0x82; |
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58 out[x++] = (inlen>>8)&255; |
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59 out[x++] = inlen&255; |
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60 } else if (inlen < 16777216UL) { |
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61 out[x++] = 0x83; |
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62 out[x++] = (inlen>>16)&255; |
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63 out[x++] = (inlen>>8)&255; |
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64 out[x++] = inlen&255; |
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65 } else { |
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66 return CRYPT_INVALID_ARG; |
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67 } |
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68 |
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69 /* store octets */ |
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70 for (y = 0; y < inlen; y++) { |
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71 out[x++] = der_ia5_char_encode(in[y]); |
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72 } |
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73 |
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74 /* retun length */ |
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75 *outlen = x; |
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76 |
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77 return CRYPT_OK; |
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78 } |
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79 |
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80 #endif |
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81 |
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82 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/ia5/der_encode_ia5_string.c,v $ */ |
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83 /* $Revision: 1.1 $ */ |
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84 /* $Date: 2005/05/16 15:08:11 $ */ |
