Class: Camellia

Inherits:
Object
  • Object
show all
Defined in:
ext/camellia-rb.c

Instance Method Summary collapse

Instance Method Details

#cbc_decrypt(args) ⇒ Object

# CBC decryption method



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# File 'ext/camellia-rb.c', line 468

static VALUE cbc_decrypt(VALUE *self, VALUE args)
{
	camelliaObject *camellia;
	unsigned char *src;
	unsigned char *destdata;
	int srclen;
	int i, j, destidx;
	u1byte tmp[16];
	VALUE retvalue;

	Check_Type(args, T_STRING);
	srclen = RSTRING_LEN(args);
	src = (unsigned char *)RSTRING_PTR(args);
	
	Data_Get_Struct(self,camelliaObject, camellia);

	// check if key is initialized
	if (!camellia->key_gen)
	{
		rb_raise(eCamellia,"must set up a key before you can cbc_decrypt!");
		return 0; 
	}

	// check if IV is initialized
	if (camellia->cbc128_idx != -1)
	{
		rb_raise(eCamellia,"must set up a salt before you can cbc_decrypt!");
		return 0; 
	}

	destdata = (unsigned char *)malloc(srclen);

	// CBC decryption
	destidx = 0;
	camellia->cbc128_idx = 0;
	for (i = 0; i < srclen; i++)
	{
		tmp[camellia->cbc128_idx] = camellia->cbc_blk[camellia->cbc128_idx];
		camellia->cbc_blk[camellia->cbc128_idx++] = src[i];

		if (camellia->cbc128_idx == 16)
		{
			Camellia_DecryptBlock(camellia->key_len,  camellia->cbc_blk, camellia->key, camellia->cbc_crypt);
			camellia->cbc128_idx=0;
			
			for (j = 0; j < 16; j++)
			{
				destdata[destidx++] = camellia->cbc_crypt[j] ^ tmp[j];
			}
		}
	}

	// remove paddingchar
	while (destdata[srclen-1] == camellia->cbc_pchar)
	{
		srclen--;
	}

	retvalue=rb_str_new((char *)destdata, srclen);
	free(destdata);
	return retvalue;
}

#cbc_encrypt(args) ⇒ Object

# CBC encryption method



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# File 'ext/camellia-rb.c', line 391

static VALUE cbc_encrypt(VALUE self,VALUE args)
{
	camelliaObject *camellia;
	unsigned char *src;
	unsigned char *destdata;
	int srclen;
	int i, j, ch, destidx;
	VALUE retvalue;

	Check_Type(args,T_STRING);
	src = (unsigned char *)RSTRING_PTR(args);
	srclen = RSTRING_LEN(args);

	Data_Get_Struct(self,camelliaObject,camellia);

	// check if key is initialized
	if (!camellia->key_gen)
	{
		rb_raise(eCamellia,"must set up a key before you can cbc_encrypt!");
		return self; 
	}

	// check if IV is initialized
	if (camellia->cbc128_idx != -1)
	{
		rb_raise(eCamellia,"must set up a salt before you can cbc_encrypt!");
		return self; 
	}

	if (srclen % 16 == 0)
		destdata = (unsigned char *)malloc(srclen);
	else
		destdata = (unsigned char *)malloc((srclen/16+1)*16);

	// CBC encryption
	destidx = 0;
	camellia->cbc128_idx = 0;
	for (i = 0; i < srclen; i++)
	{
		ch = src[i] ^ camellia->cbc_crypt[camellia->cbc128_idx];
		camellia->cbc_blk[camellia->cbc128_idx++] = ch; 

	   	if (camellia->cbc128_idx == 16)
		{
			Camellia_EncryptBlock(camellia->key_len, camellia->cbc_blk, camellia->key, camellia->cbc_crypt);
			camellia->cbc128_idx=0;
			for (j = 0; j < 16; j++)
			{
				destdata[destidx++] = camellia->cbc_crypt[j];
			}
		}
	}
	if (srclen % 16 != 0)
	{
		while (camellia->cbc128_idx < 16)
		{
			camellia->cbc_blk[camellia->cbc128_idx] = camellia->cbc_pchar ^ camellia->cbc_crypt[camellia->cbc128_idx++];
		}
	
		Camellia_EncryptBlock(camellia->key_len, camellia->cbc_blk, camellia->key, camellia->cbc_crypt);
		for (j = 0; j < 16; j++)
		{
			destdata[destidx++] = camellia->cbc_crypt[j];
		}
	}

	if (srclen % 16 == 0)
		retvalue = rb_str_new((char *)destdata, srclen);
	else
		retvalue = rb_str_new((char *)destdata, (srclen/16+1)*16);
	free(destdata);
	return retvalue;
}

#cbc_pchar(args) ⇒ Object

# CBC padding charactor set



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# File 'ext/camellia-rb.c', line 363

static VALUE cbc_pchar(VALUE self, VALUE args)
{
	camelliaObject *camellia;
	unsigned char *src;
	int src_len;

	Check_Type(args,T_STRING);
	src = (unsigned char *)RSTRING_PTR(args);
	src_len = RSTRING_LEN(args);

	// check pcharlength
	if (src_len != 1)
	{
		rb_raise(rb_eArgError, "wrong padding data length (must be 1 bytes, found %d bytes)", src_len);
		return self;
	}

	Data_Get_Struct(self, camelliaObject, camellia);

	// pchar set
	camellia->cbc_pchar = *src;
	
	return self;
}

#cbc_salt(args) ⇒ Object

# CBC IV set



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# File 'ext/camellia-rb.c', line 326

static VALUE cbc_salt(VALUE self, VALUE args)
{
	camelliaObject *camellia;
	unsigned char *src;
	unsigned char *dest, *dest2;
	int src_len;
	int i;

	Check_Type(args,T_STRING);
	src = (unsigned char *)RSTRING_PTR(args);
	src_len = RSTRING_LEN(args);

	// check IV length
	if (src_len != 16)
	{
		rb_raise(rb_eArgError, "wrong data length (must be 16 bytes, found %d bytes)", src_len);
		return self;
	}

	Data_Get_Struct(self, camelliaObject, camellia);

	// CBC initial set
	camellia->cbc128_idx = -1;
	dest = camellia->cbc_blk;
	dest2 = camellia->cbc_crypt;
	for (i = 0; i < 16; i++)
	{
		*dest++ = *src;
		*dest2++ = *src++;
	}
	
	return self;
}

#cfb_decrypt(args) ⇒ Object

# CFB decryption method



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# File 'ext/camellia-rb.c', line 273

static VALUE cfb_decrypt(VALUE *self, VALUE args)
{
	camelliaObject *camellia;
	unsigned char *src;
	unsigned char *destdata;
	int srclen;
	int i;
	unsigned char ch;
	VALUE retvalue;

	Check_Type(args, T_STRING);
	srclen = RSTRING_LEN(args);
	src = (unsigned char *)RSTRING_PTR(args);

	Data_Get_Struct(self,camelliaObject, camellia);

	// check if key is initialized
	if (!camellia->key_gen)
	{
		rb_raise(eCamellia,"must set up a key before you can cfb_decrypt!");
		return 0; 
	}

	// check if IV is initialized
	if (camellia->cfb128_idx != -1)
	{
		rb_raise(eCamellia,"must set up a salt before you can cfb_decrypt!");
		return 0; 
	}

	destdata = (unsigned char *)malloc(srclen);

	// CFB decryption
	for (i = 0; i < srclen; i++)
	{
		if (camellia->cfb128_idx < 0 || camellia->cfb128_idx > 15)
		{
			Camellia_EncryptBlock(camellia->key_len,  camellia->cfb_blk, camellia->key, camellia->cfb_crypt);
			camellia->cfb128_idx=0;
		}
		ch = src[i];
		destdata[i] = ch ^ camellia->cfb_crypt[camellia->cfb128_idx]; 
		camellia->cfb_blk[camellia->cfb128_idx++] = ch; 
	}

	retvalue=rb_str_new((char *)destdata, srclen);
	free(destdata);
	return retvalue;
}

#cfb_encrypt(args) ⇒ Object

# CFB encryption method



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# File 'ext/camellia-rb.c', line 221

static VALUE cfb_encrypt(VALUE self,VALUE args)
{
	camelliaObject *camellia;
	unsigned char *src;
	unsigned char *destdata;
	int srclen;
	int i,ch;
	VALUE retvalue;

	Check_Type(args,T_STRING);
	src = (unsigned char *)RSTRING_PTR(args);
	srclen = RSTRING_LEN(args);

	Data_Get_Struct(self,camelliaObject,camellia);

	// check if key is initialized
	if (!camellia->key_gen)
	{
		rb_raise(eCamellia,"must set up a key before you can cfb_encrypt!");
		return self; 
	}

	// check if IV is initialized
	if (camellia->cfb128_idx != -1)
	{
		rb_raise(eCamellia,"must set up a salt before you can cfb_encrypt!");
		return self; 
	}

	destdata = (unsigned char *)malloc(srclen);

	// CFB encryption
	for (i = 0; i < srclen; i++)
	{
	   	if ((camellia->cfb128_idx < 0) || (camellia->cfb128_idx > 15))
		{
			Camellia_EncryptBlock(camellia->key_len, camellia->cfb_blk, camellia->key, camellia->cfb_crypt);
			camellia->cfb128_idx=0;
		}
		ch = src[i] ^ camellia->cfb_crypt[camellia->cfb128_idx];
		camellia->cfb_blk[camellia->cfb128_idx++] = ch; 
		destdata[i] = (unsigned char)ch;
	}

	retvalue = rb_str_new((char *)destdata, srclen);
	free(destdata);
	return retvalue;
}

#cfb_salt(args) ⇒ Object

# CFB IV set method



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# File 'ext/camellia-rb.c', line 186

static VALUE cfb_salt(VALUE self, VALUE args)
{
	camelliaObject *camellia;
	unsigned char *src;
	unsigned char *dest;
	int src_len;
	int i;

	Check_Type(args,T_STRING);
	src = (unsigned char *)RSTRING_PTR(args);
	src_len = RSTRING_LEN(args);

	// check IV length
	if (src_len != 16)
	{
		rb_raise(rb_eArgError, "wrong data length (must be 16 bytes, found %d bytes)", src_len);
		return self;
	}

	Data_Get_Struct(self, camelliaObject, camellia);

	// CFB initial set
	camellia->cfb128_idx = -1;
	dest = camellia->cfb_blk;
	for (i = 0; i < 16; i++)
	{
		*dest++ = *src++;
	}
	
	return self;
}

#decrypt(args) ⇒ Object

# decryption method



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# File 'ext/camellia-rb.c', line 150

static VALUE decrypt(VALUE self,VALUE args)
{
	camelliaObject *camellia;
	unsigned char *data;
	int data_len;
	u1byte out_blk[16];

	Check_Type(args, T_STRING);
	data_len = RSTRING_LEN(args);
	data = (unsigned char *)RSTRING_PTR(args);

	// check data length
	if (data_len != 16)
	{
		rb_raise(rb_eArgError, "wrong data length (must be 16 bytes, found %d bytes)", data_len);
		return 0;
	}

	Data_Get_Struct(self, camelliaObject, camellia);

	// check if key is initialized
	if (!camellia->key_gen)
	{
		rb_raise(eCamellia,"must set up a key before you can decrypt!");
		return 0; 
	}

	// decryption
	Camellia_DecryptBlock(camellia->key_len, data, camellia->key, out_blk);

	return rb_str_new((char *)out_blk,16);
}

#encrypt(args) ⇒ Object

# encryption method



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# File 'ext/camellia-rb.c', line 114

static VALUE encrypt(VALUE self, VALUE args)
{
	camelliaObject *camellia;
	unsigned char *data;
	int data_len;
	u1byte out_blk[16];

	Check_Type(args, T_STRING);
	data_len = RSTRING_LEN(args);
	data = (unsigned char *)RSTRING_PTR(args);

	Data_Get_Struct(self, camelliaObject, camellia);

	// check data length
	if (data_len != 16)
	{
		rb_raise(rb_eArgError, "wrong data length (must be 16 bytes, found %d bytes)", data_len);
		return self;
	}

	// check if key is initialized
	if (!camellia->key_gen)
	{
		rb_raise(eCamellia,"must set up a key before you can encrypt!");
		return self; 
	}

	// encryption
   Camellia_EncryptBlock(camellia->key_len, data, camellia->key, out_blk);

	return rb_str_new((char *)out_blk, 16);
}