sha256.cc #1

/*
 * This code wraps the SSL (libcrypt.a) SHA256 functions
 */

# include <stdhdrs.h>
# include <strbuf.h>
# include <strops.h>
# include <sha256.h>

# ifdef USE_SSL
extern "C"
{ // OpenSSL
# include <openssl/sha.h>
}

Sha256Digester::Sha256Digester()
{
	ctx = malloc( sizeof( SHA256_CTX ) );
	SHA256_Init( (SHA256_CTX *)ctx );
}

Sha256Digester::~Sha256Digester()
{
	free( ctx );
}

void
Sha256Digester::Update( const StrPtr &buf )
{
	SHA256_Update( (SHA256_CTX *)ctx, buf.Text(), buf.Length() );
}

void
Sha256Digester::Final( Sha256 &sha )
{
	Final( sha.data );
}

void
Sha256Digester::Final( unsigned char digest[ Sha256Length ] )
{
	SHA256_Final( digest, (SHA256_CTX *)ctx );
}

void
Sha256Digester::Final( StrBuf &output )
{
	unsigned char digest[ Sha256Length ];
	SHA256_Final( digest, (SHA256_CTX *)ctx );
	output.Clear();	
	StrOps::OtoXlower( digest, sizeof( digest ), output );
}

# else

/* Stub implementation for non-SSL builds. Is a no-op if you try to run it. */

Sha256Digester::Sha256Digester()
{
}

Sha256Digester::~Sha256Digester()
{
}

void
Sha256Digester::Update( const StrPtr &buf )
{
}

void
Sha256Digester::Final( Sha256 &sha )
{
}

void
Sha256Digester::Final( unsigned char digest[ Sha256Length ] )
{
}

void
Sha256Digester::Final( StrBuf &output )
{
}

# endif

/**********************************************************************/

void
Sha256::FromString( const StrPtr *sha )
{
	int shaLen = sha->Length() / 2;
	StrOps::XtoO( sha->Text(), data, shaLen );
}

void
Sha256::Fmt( StrBuf &output ) const
{
	output.Clear();
	StrOps::OtoXlower( data, Sha256Length, output );
}

int
Sha256::IsSet() const
{
	for( int i = 0; i < Sha256Length; i++ )
	    if( data[i] )
		return 1;
	return 0;
}