?? der_encode_sequence_ex.c
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com */#include "tomcrypt.h"#include <stdarg.h>/** @file der_encode_sequence_ex.c ASN.1 DER, encode a SEQUENCE, Tom St Denis*/#ifdef LTC_DER/** Encode a SEQUENCE @param list The list of items to encode @param inlen The number of items in the list @param out [out] The destination @param outlen [in/out] The size of the output @param type_of LTC_ASN1_SEQUENCE or LTC_ASN1_SET/LTC_ASN1_SETOF @return CRYPT_OK on success*/int der_encode_sequence_ex(ltc_asn1_list *list, unsigned long inlen, unsigned char *out, unsigned long *outlen, int type_of) { int err, type; unsigned long size, x, y, z, i; void *data; LTC_ARGCHK(list != NULL); LTC_ARGCHK(out != NULL); LTC_ARGCHK(outlen != NULL); /* get size of output that will be required */ y = 0; for (i = 0; i < inlen; i++) { type = list[i].type; size = list[i].size; data = list[i].data; if (type == LTC_ASN1_EOL) { break; } switch (type) { case LTC_ASN1_BOOLEAN: if ((err = der_length_boolean(&x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_INTEGER: if ((err = der_length_integer(data, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_SHORT_INTEGER: if ((err = der_length_short_integer(*((unsigned long*)data), &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_BIT_STRING: if ((err = der_length_bit_string(size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_OCTET_STRING: if ((err = der_length_octet_string(size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_NULL: y += 2; break; case LTC_ASN1_OBJECT_IDENTIFIER: if ((err = der_length_object_identifier(data, size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_IA5_STRING: if ((err = der_length_ia5_string(data, size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_PRINTABLE_STRING: if ((err = der_length_printable_string(data, size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_UTF8_STRING: if ((err = der_length_utf8_string(data, size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_UTCTIME: if ((err = der_length_utctime(data, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; case LTC_ASN1_SET: case LTC_ASN1_SETOF: case LTC_ASN1_SEQUENCE: if ((err = der_length_sequence(data, size, &x)) != CRYPT_OK) { goto LBL_ERR; } y += x; break; default: err = CRYPT_INVALID_ARG; goto LBL_ERR; } } /* calc header size */ z = y; if (y < 128) { y += 2; } else if (y < 256) { /* 0x30 0x81 LL */ y += 3; } else if (y < 65536UL) { /* 0x30 0x82 LL LL */ y += 4; } else if (y < 16777216UL) { /* 0x30 0x83 LL LL LL */ y += 5; } else { err = CRYPT_INVALID_ARG; goto LBL_ERR; } /* too big ? */ if (*outlen < y) { *outlen = y; err = CRYPT_BUFFER_OVERFLOW; goto LBL_ERR; } /* store header */ x = 0; out[x++] = (type_of == LTC_ASN1_SEQUENCE) ? 0x30 : 0x31; if (z < 128) { out[x++] = (unsigned char)z; } else if (z < 256) { out[x++] = 0x81; out[x++] = (unsigned char)z; } else if (z < 65536UL) { out[x++] = 0x82; out[x++] = (unsigned char)((z>>8UL)&255); out[x++] = (unsigned char)(z&255); } else if (z < 16777216UL) { out[x++] = 0x83; out[x++] = (unsigned char)((z>>16UL)&255); out[x++] = (unsigned char)((z>>8UL)&255); out[x++] = (unsigned char)(z&255); } /* store data */ *outlen -= x; for (i = 0; i < inlen; i++) { type = list[i].type; size = list[i].size; data = list[i].data; if (type == LTC_ASN1_EOL) { break; } switch (type) { case LTC_ASN1_BOOLEAN: z = *outlen; if ((err = der_encode_boolean(*((int *)data), out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_INTEGER: z = *outlen; if ((err = der_encode_integer(data, out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_SHORT_INTEGER: z = *outlen; if ((err = der_encode_short_integer(*((unsigned long*)data), out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_BIT_STRING: z = *outlen; if ((err = der_encode_bit_string(data, size, out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_OCTET_STRING: z = *outlen; if ((err = der_encode_octet_string(data, size, out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_NULL: out[x++] = 0x05; out[x++] = 0x00; *outlen -= 2; break; case LTC_ASN1_OBJECT_IDENTIFIER: z = *outlen; if ((err = der_encode_object_identifier(data, size, out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_IA5_STRING: z = *outlen; if ((err = der_encode_ia5_string(data, size, out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_PRINTABLE_STRING: z = *outlen; if ((err = der_encode_printable_string(data, size, out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_UTF8_STRING: z = *outlen; if ((err = der_encode_utf8_string(data, size, out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_UTCTIME: z = *outlen; if ((err = der_encode_utctime(data, out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_SET: z = *outlen; if ((err = der_encode_set(data, size, out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_SETOF: z = *outlen; if ((err = der_encode_setof(data, size, out + x, &z)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; case LTC_ASN1_SEQUENCE: z = *outlen; if ((err = der_encode_sequence_ex(data, size, out + x, &z, type)) != CRYPT_OK) { goto LBL_ERR; } x += z; *outlen -= z; break; default: err = CRYPT_INVALID_ARG; goto LBL_ERR; } } *outlen = x; err = CRYPT_OK; LBL_ERR: return err;}#endif?? 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