diff options
Diffstat (limited to 'libtomcrypt/src/pk/asn1/der/choice/der_decode_choice.c')
| -rw-r--r-- | libtomcrypt/src/pk/asn1/der/choice/der_decode_choice.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/libtomcrypt/src/pk/asn1/der/choice/der_decode_choice.c b/libtomcrypt/src/pk/asn1/der/choice/der_decode_choice.c new file mode 100644 index 0000000..61cba11 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/choice/der_decode_choice.c @@ -0,0 +1,168 @@ +/* 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.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_choice.c + ASN.1 DER, decode a CHOICE, Tom St Denis +*/ + +#ifdef LTC_DER + +/** + Decode a CHOICE + @param in The DER encoded input + @param inlen [in/out] The size of the input and resulting size of read type + @param list The list of items to decode + @param outlen The number of items in the list + @return CRYPT_OK on success +*/ +int der_decode_choice(const unsigned char *in, unsigned long *inlen, + ltc_asn1_list *list, unsigned long outlen) +{ + unsigned long size, x, z; + void *data; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(inlen != NULL); + LTC_ARGCHK(list != NULL); + + /* get blk size */ + if (*inlen < 2) { + return CRYPT_INVALID_PACKET; + } + + /* set all of the "used" flags to zero */ + for (x = 0; x < outlen; x++) { + list[x].used = 0; + } + + /* now scan until we have a winner */ + for (x = 0; x < outlen; x++) { + size = list[x].size; + data = list[x].data; + + switch (list[x].type) { + case LTC_ASN1_INTEGER: + if (der_decode_integer(in, *inlen, data) == CRYPT_OK) { + if (der_length_integer(data, &z) == CRYPT_OK) { + list[x].used = 1; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_SHORT_INTEGER: + if (der_decode_short_integer(in, *inlen, data) == CRYPT_OK) { + if (der_length_short_integer(size, &z) == CRYPT_OK) { + list[x].used = 1; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_BIT_STRING: + if (der_decode_bit_string(in, *inlen, data, &size) == CRYPT_OK) { + if (der_length_bit_string(size, &z) == CRYPT_OK) { + list[x].used = 1; + list[x].size = size; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_OCTET_STRING: + if (der_decode_octet_string(in, *inlen, data, &size) == CRYPT_OK) { + if (der_length_octet_string(size, &z) == CRYPT_OK) { + list[x].used = 1; + list[x].size = size; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_NULL: + if (*inlen == 2 && in[x] == 0x05 && in[x+1] == 0x00) { + *inlen = 2; + return CRYPT_OK; + } + break; + + case LTC_ASN1_OBJECT_IDENTIFIER: + if (der_decode_object_identifier(in, *inlen, data, &size) == CRYPT_OK) { + if (der_length_object_identifier(data, size, &z) == CRYPT_OK) { + list[x].used = 1; + list[x].size = size; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_IA5_STRING: + if (der_decode_ia5_string(in, *inlen, data, &size) == CRYPT_OK) { + if (der_length_ia5_string(data, size, &z) == CRYPT_OK) { + list[x].used = 1; + list[x].size = size; + *inlen = z; + return CRYPT_OK; + } + } + break; + + + case LTC_ASN1_PRINTABLE_STRING: + if (der_decode_printable_string(in, *inlen, data, &size) == CRYPT_OK) { + if (der_length_printable_string(data, size, &z) == CRYPT_OK) { + list[x].used = 1; + list[x].size = size; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_UTCTIME: + z = *inlen; + if (der_decode_utctime(in, &z, data) == CRYPT_OK) { + list[x].used = 1; + *inlen = z; + return CRYPT_OK; + } + break; + + case LTC_ASN1_SEQUENCE: + if (der_decode_sequence(in, *inlen, data, size) == CRYPT_OK) { + if (der_length_sequence(data, size, &z) == CRYPT_OK) { + list[x].used = 1; + *inlen = z; + return CRYPT_OK; + } + } + break; + + default: + return CRYPT_INVALID_ARG; + } + } + + return CRYPT_INVALID_PACKET; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/choice/der_decode_choice.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2005/06/19 11:25:01 $ */ |