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70 lines
2.1 KiB
70 lines
2.1 KiB
// PublicKeyHelper.cpp -- Helper routines to deal with CCI public keys
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// (c) Copyright Schlumberger Technology Corp., unpublished work, created
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// 2000. This computer program includes Confidential, Proprietary
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// Information and is a Trade Secret of Schlumberger Technology Corp. All
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// use, disclosure, and/or reproduction is prohibited unless authorized
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// in writing. All Rights Reserved.
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#include "PublicKeyHelper.h"
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using namespace cci;
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/////////////////////////// HELPERS /////////////////////////////////
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CPublicKey
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AsPublicKey(Blob const &rblbModulus, // little endian
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DWORD dwExponent,
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cci::CCard &rhcard)
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{
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Blob blbExponent(reinterpret_cast<Blob::value_type *>(&dwExponent),
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sizeof dwExponent);
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return AsPublicKey(rblbModulus, blbExponent, rhcard);
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}
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CPublicKey
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AsPublicKey(Blob const &rblbModulus, // little endian
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Blob const &rblbExponent, // little endian
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CCard &rhcard)
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{
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Blob blbTmpModulus(rblbModulus);
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Blob blbTmpExponent(rblbExponent);
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if (rhcard->IsPKCS11Enabled())
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{
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// store modulus and exponent compressed
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TrimExtraZeroes(blbTmpModulus);
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TrimExtraZeroes(blbTmpExponent);
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}
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CPublicKey hpubkey(rhcard);
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hpubkey->Modulus(AsString(blbTmpModulus));
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hpubkey->Exponent(AsString(blbTmpExponent));
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return hpubkey;
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}
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void
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TrimExtraZeroes(Blob &rblob)
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{
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Blob::size_type const cLength = rblob.length();
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if (0 != cLength)
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{
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Blob::value_type const Zero = 0;
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Blob::size_type const cLastNonZero =
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rblob.find_last_not_of(Zero); // little endian
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Blob::size_type const cLastPos = cLength - 1;
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if (cLastPos != cLastNonZero)
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{
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Blob::size_type cCharToKeep =
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(Blob::npos == cLastNonZero)
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? 0
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: cLastNonZero + 1;
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if (cLastPos != cCharToKeep) // keep one zero
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rblob.erase(cCharToKeep + 1);
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}
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}
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}
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