X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;ds=sidebyside;f=libs%2Flibtomcrypt%2Fpk%2Fasn1%2Fder%2Fshort_integer%2Fder_decode_short_integer.c;fp=libs%2Flibtomcrypt%2Fpk%2Fasn1%2Fder%2Fshort_integer%2Fder_decode_short_integer.c;h=1407e9a0f0c7563bdc38e58d767c648ec35d9f37;hb=109c20e6f822c6efa465af31249e5608469253b6;hp=0000000000000000000000000000000000000000;hpb=9ae3b1434e51788e6feb72e1415ec800d05c535a;p=fms.git diff --git a/libs/libtomcrypt/pk/asn1/der/short_integer/der_decode_short_integer.c b/libs/libtomcrypt/pk/asn1/der/short_integer/der_decode_short_integer.c new file mode 100644 index 0000000..1407e9a --- /dev/null +++ b/libs/libtomcrypt/pk/asn1/der/short_integer/der_decode_short_integer.c @@ -0,0 +1,68 @@ +/* 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" + +/** + @file der_decode_short_integer.c + ASN.1 DER, decode an integer, Tom St Denis +*/ + + +#ifdef LTC_DER + +/** + Read a short integer + @param in The DER encoded data + @param inlen Size of data + @param num [out] The integer to decode + @return CRYPT_OK if successful +*/ +int der_decode_short_integer(const unsigned char *in, unsigned long inlen, unsigned long *num) +{ + unsigned long len, x, y; + + LTC_ARGCHK(num != NULL); + LTC_ARGCHK(in != NULL); + + /* check length */ + if (inlen < 2) { + return CRYPT_INVALID_PACKET; + } + + /* check header */ + x = 0; + if ((in[x++] & 0x1F) != 0x02) { + return CRYPT_INVALID_PACKET; + } + + /* get the packet len */ + len = in[x++]; + + if (x + len > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* read number */ + y = 0; + while (len--) { + y = (y<<8) | (unsigned long)in[x++]; + } + *num = y; + + return CRYPT_OK; + +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/short_integer/der_decode_short_integer.c,v $ */ +/* $Revision: 1.6 $ */ +/* $Date: 2006/03/31 14:15:35 $ */