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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_octet_string.c |
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15 ASN.1 DER, encode a OCTET STRING, Tom St Denis |
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16 */ |
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17 |
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18 |
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19 #ifdef LTC_DER |
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20 |
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21 /** |
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22 Store an OCTET STRING |
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23 @param in The array of OCTETS to store (one per char) |
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24 @param inlen The number of OCTETS to store |
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25 @param out [out] The destination for the DER encoded OCTET STRING |
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26 @param outlen [in/out] The max size and resulting size of the DER OCTET STRING |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int der_encode_octet_string(const unsigned char *in, unsigned long inlen, |
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30 unsigned char *out, unsigned long *outlen) |
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31 { |
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32 unsigned long x, y, len; |
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33 int err; |
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34 |
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35 LTC_ARGCHK(in != NULL); |
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36 LTC_ARGCHK(out != NULL); |
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37 LTC_ARGCHK(outlen != NULL); |
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38 |
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39 /* get the size */ |
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40 if ((err = der_length_octet_string(inlen, &len)) != CRYPT_OK) { |
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41 return err; |
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42 } |
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43 |
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44 /* too big? */ |
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45 if (len > *outlen) { |
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46 return CRYPT_BUFFER_OVERFLOW; |
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47 } |
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48 |
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49 /* encode the header+len */ |
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50 x = 0; |
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51 out[x++] = 0x04; |
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52 if (inlen < 128) { |
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53 out[x++] = inlen; |
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54 } else if (inlen < 256) { |
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55 out[x++] = 0x81; |
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56 out[x++] = inlen; |
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57 } else if (inlen < 65536UL) { |
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58 out[x++] = 0x82; |
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59 out[x++] = (inlen>>8)&255; |
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60 out[x++] = inlen&255; |
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61 } else if (inlen < 16777216UL) { |
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62 out[x++] = 0x83; |
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63 out[x++] = (inlen>>16)&255; |
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64 out[x++] = (inlen>>8)&255; |
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65 out[x++] = inlen&255; |
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66 } else { |
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67 return CRYPT_INVALID_ARG; |
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68 } |
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69 |
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70 /* store octets */ |
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71 for (y = 0; y < inlen; y++) { |
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72 out[x++] = in[y]; |
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73 } |
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74 |
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75 /* retun length */ |
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76 *outlen = x; |
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77 |
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78 return CRYPT_OK; |
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79 } |
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80 |
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81 #endif |
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82 |
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83 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c,v $ */ |
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84 /* $Revision: 1.1 $ */ |
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85 /* $Date: 2005/05/16 15:08:11 $ */ |
