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simple emsa3/pkcs1 encoding function

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svn path=/trunk/kdesupport/qca/; revision=652395
This commit is contained in:
Justin Karneges 2007-04-10 21:32:22 +00:00
parent 310307e272
commit 99a846e139
2 changed files with 77 additions and 0 deletions
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10
include/QtCrypto/qca_publickey.h
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@ -123,6 +123,16 @@ namespace QCA
IETF_4096
};
/**
Encode a hash result in EMSA3 (PKCS#1) format
This is a convenience function for providers that only have access
to raw RSA signing (mainly smartcard providers). This is a built-in
function of QCA and does not utilize a provider. SHA1, MD5, MD2,
and RIPEMD160 are supported.
*/
QCA_EXPORT QSecureArray emsa3Encode(const QString &hashName, const QSecureArray &digest, int size = -1);
/**
\class DLGroup qca_publickey.h QtCrypto

67
src/qca_publickey.cpp
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@ -297,6 +297,73 @@ PBEAlgorithm get_pbe_default()
return PBES2_TripleDES_SHA1;
}
//----------------------------------------------------------------------------
// Global
//----------------------------------------------------------------------------
// adapted from Botan
static const unsigned char pkcs_sha1[] =
{
0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x0E, 0x03, 0x02,
0x1A, 0x05, 0x00, 0x04, 0x14
};
static const unsigned char pkcs_md5[] =
{
0x30, 0x20, 0x30, 0x0C, 0x06, 0x08, 0x2A, 0x86, 0x48, 0x86,
0xF7, 0x0D, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10
};
static const unsigned char pkcs_md2[] =
{
0x30, 0x20, 0x30, 0x0C, 0x06, 0x08, 0x2A, 0x86, 0x48, 0x86,
0xF7, 0x0D, 0x02, 0x02, 0x05, 0x00, 0x04, 0x10
};
static const unsigned char pkcs_ripemd160[] =
{
0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x24, 0x03, 0x02,
0x01, 0x05, 0x00, 0x04, 0x14
};
QByteArray get_hash_id(const QString &name)
{
if(name == "sha1")
return QByteArray::fromRawData((const char *)pkcs_sha1, sizeof(pkcs_sha1));
else if(name == "md5")
return QByteArray::fromRawData((const char *)pkcs_md5, sizeof(pkcs_md5));
else if(name == "md2")
return QByteArray::fromRawData((const char *)pkcs_md2, sizeof(pkcs_md2));
else if(name == "ripemd160")
return QByteArray::fromRawData((const char *)pkcs_ripemd160, sizeof(pkcs_ripemd160));
else
return QByteArray();
}
QSecureArray emsa3Encode(const QString &hashName, const QSecureArray &digest, int size)
{
QByteArray hash_id = get_hash_id(hashName);
if(hash_id.isEmpty())
return QSecureArray();
// logic adapted from Botan
int basesize = hash_id.size() + digest.size() + 2;
if(size == -1)
size = basesize + 1; // default to 1-byte pad
int padlen = size - basesize;
if(padlen < 1)
return QSecureArray();
QSecureArray out(size, 0xff); // pad with 0xff
out[0] = 0x01;
out[padlen + 1] = 0x00;
int at = padlen + 2;
memcpy(out.data() + at, hash_id.data(), hash_id.size());
at += hash_id.size();
memcpy(out.data() + at, digest.data(), digest.size());
return out;
}
//----------------------------------------------------------------------------
// DLGroup
//----------------------------------------------------------------------------