3 changed files with 1 additions and 90 deletions
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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* |
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* LibTomCrypt is a library that provides various cryptographic |
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* algorithms in a highly modular and flexible manner. |
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* |
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* The library is free for all purposes without any express |
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* guarantee it works. |
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* |
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* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
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*/ |
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#include "../../headers/tomcrypt.h" |
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/**
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@file rsa_verify_simple.c |
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Created by Ladislav Zezula (zezula@volny.cz) as modification |
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for Blizzard strong signature verification |
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*/ |
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#ifdef LTC_MRSA |
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/**
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Simple RSA decryption |
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@param sig The signature data |
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@param siglen The length of the signature data (octets) |
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@param hash The hash of the message that was signed |
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@param hashlen The length of the hash of the message that was signed (octets) |
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@param stat [out] The result of the signature comparison, 1==valid, 0==invalid |
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@param key The public RSA key corresponding |
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@return Error code |
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*/ |
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int rsa_verify_simple(const unsigned char *sig, unsigned long siglen, |
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const unsigned char *hash, unsigned long hashlen, |
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int *stat, |
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rsa_key *key) |
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{ |
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unsigned long modulus_bitlen, modulus_bytelen, x; |
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unsigned char *tmpbuf; |
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int err; |
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LTC_ARGCHK(sig != NULL); |
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LTC_ARGCHK(hash != NULL); |
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LTC_ARGCHK(stat != NULL); |
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LTC_ARGCHK(key != NULL); |
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/* default to invalid */ |
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*stat = 0; |
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/* get modulus len in bits */ |
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modulus_bitlen = mp_count_bits( (key->N)); |
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/* outlen must be at least the size of the modulus */ |
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modulus_bytelen = mp_unsigned_bin_size( (key->N)); |
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if (modulus_bytelen != siglen) { |
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return CRYPT_INVALID_PACKET; |
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} |
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/* allocate temp buffer for decoded sig */ |
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tmpbuf = XMALLOC(siglen); |
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if (tmpbuf == NULL) { |
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return CRYPT_MEM; |
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} |
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/* RSA decode it */ |
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x = siglen; |
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if ((err = ltc_mp.rsa_me(sig, siglen, tmpbuf, &x, PK_PUBLIC, key)) != CRYPT_OK) { |
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XFREE(tmpbuf); |
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return err; |
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} |
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/* make sure the output is the right size */ |
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if (x != siglen) { |
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XFREE(tmpbuf); |
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return CRYPT_INVALID_PACKET; |
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} |
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/* compare the decrypted signature with the given hash */ |
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if(x == hashlen && XMEMCMP(tmpbuf, hash, hashlen) == 0) |
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*stat = 1; |
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#ifdef LTC_CLEAN_STACK |
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zeromem(tmpbuf, siglen); |
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#endif |
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XFREE(tmpbuf); |
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return CRYPT_OK; |
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} |
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#endif /* LTC_MRSA */ |
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