Exemple #1
0
/*
 * The verify operation is here for completeness similar to the verification
 * defined in RFC2313 section 10.2 except that block type 0 is not accepted,
 * as in RFC2437.  RFC2437 section 9.2 doesn't define any operation to
 * retrieve the DigestInfo from a signature, instead the user is expected
 * to call the sign operation to generate the expected signature and compare
 * signatures instead of the message-digests.
 */
static int pkcs1pad_verify(struct akcipher_request *req)
{
	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
	int err;

	if (!ctx->key_size || req->src_len < ctx->key_size)
		return -EINVAL;

	req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
	if (!req_ctx->out_buf)
		return -ENOMEM;

	pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
			    ctx->key_size, NULL);

	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
			pkcs1pad_verify_complete_cb, req);

	/* Reuse input buffer, output to a new buffer */
	akcipher_request_set_crypt(&req_ctx->child_req, req->src,
				   req_ctx->out_sg, req->src_len,
				   ctx->key_size);

	err = crypto_akcipher_verify(&req_ctx->child_req);
	if (err != -EINPROGRESS && err != -EBUSY)
		return pkcs1pad_verify_complete(req, err);

	return err;
}
Exemple #2
0
static int pkcs1pad_sign(struct akcipher_request *req)
{
	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
	struct akcipher_instance *inst = akcipher_alg_instance(tfm);
	struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
	const struct rsa_asn1_template *digest_info = ictx->digest_info;
	int err;
	unsigned int ps_end, digest_size = 0;

	if (!ctx->key_size)
		return -EINVAL;

	if (digest_info)
		digest_size = digest_info->size;

	if (req->src_len + digest_size > ctx->key_size - 11)
		return -EOVERFLOW;

	if (req->dst_len < ctx->key_size) {
		req->dst_len = ctx->key_size;
		return -EOVERFLOW;
	}

	req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
				  GFP_KERNEL);
	if (!req_ctx->in_buf)
		return -ENOMEM;

	ps_end = ctx->key_size - digest_size - req->src_len - 2;
	req_ctx->in_buf[0] = 0x01;
	memset(req_ctx->in_buf + 1, 0xff, ps_end - 1);
	req_ctx->in_buf[ps_end] = 0x00;

	if (digest_info)
		memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data,
		       digest_info->size);

	pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
			ctx->key_size - 1 - req->src_len, req->src);

	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
			pkcs1pad_encrypt_sign_complete_cb, req);

	/* Reuse output buffer */
	akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
				   req->dst, ctx->key_size - 1, req->dst_len);

	err = crypto_akcipher_sign(&req_ctx->child_req);
	if (err != -EINPROGRESS && err != -EBUSY)
		return pkcs1pad_encrypt_sign_complete(req, err);

	return err;
}
Exemple #3
0
static int pkcs1pad_encrypt(struct akcipher_request *req)
{
	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
	int err;
	unsigned int i, ps_end;

	if (!ctx->key_size)
		return -EINVAL;

	if (req->src_len > ctx->key_size - 11)
		return -EOVERFLOW;

	if (req->dst_len < ctx->key_size) {
		req->dst_len = ctx->key_size;
		return -EOVERFLOW;
	}

	req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
				  GFP_KERNEL);
	if (!req_ctx->in_buf)
		return -ENOMEM;

	ps_end = ctx->key_size - req->src_len - 2;
	req_ctx->in_buf[0] = 0x02;
	for (i = 1; i < ps_end; i++)
		req_ctx->in_buf[i] = 1 + prandom_u32_max(255);
	req_ctx->in_buf[ps_end] = 0x00;

	pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
			ctx->key_size - 1 - req->src_len, req->src);

	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
			pkcs1pad_encrypt_sign_complete_cb, req);

	/* Reuse output buffer */
	akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
				   req->dst, ctx->key_size - 1, req->dst_len);

	err = crypto_akcipher_encrypt(&req_ctx->child_req);
	if (err != -EINPROGRESS && err != -EBUSY)
		return pkcs1pad_encrypt_sign_complete(req, err);

	return err;
}
Exemple #4
0
/*
 * The verify operation is here for completeness similar to the verification
 * defined in RFC2313 section 10.2 except that block type 0 is not accepted,
 * as in RFC2437.  RFC2437 section 9.2 doesn't define any operation to
 * retrieve the DigestInfo from a signature, instead the user is expected
 * to call the sign operation to generate the expected signature and compare
 * signatures instead of the message-digests.
 */
static int pkcs1pad_verify(struct akcipher_request *req)
{
	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
	int err;

	if (!ctx->key_size || req->src_len < ctx->key_size)
		return -EINVAL;

	if (ctx->key_size > PAGE_SIZE)
		return -ENOTSUPP;

	/* Reuse input buffer, output to a new buffer */
	req_ctx->child_req.src = req->src;
	req_ctx->child_req.src_len = req->src_len;
	req_ctx->child_req.dst = req_ctx->out_sg;
	req_ctx->child_req.dst_len = ctx->key_size - 1;

	req_ctx->out_buf = kmalloc(ctx->key_size - 1,
			(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
			GFP_KERNEL : GFP_ATOMIC);
	if (!req_ctx->out_buf)
		return -ENOMEM;

	pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
			ctx->key_size - 1, NULL);

	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
			pkcs1pad_verify_complete_cb, req);

	err = crypto_akcipher_verify(&req_ctx->child_req);
	if (err != -EINPROGRESS &&
			(err != -EBUSY ||
			 !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
		return pkcs1pad_verify_complete(req, err);

	return err;
}
Exemple #5
0
static int pkcs1pad_sign(struct akcipher_request *req)
{
	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
	const struct rsa_asn1_template *digest_info = NULL;
	int err;
	unsigned int ps_end, digest_size = 0;

	if (!ctx->key_size)
		return -EINVAL;

	if (ctx->hash_name) {
		digest_info = rsa_lookup_asn1(ctx->hash_name);
		if (!digest_info)
			return -EINVAL;

		digest_size = digest_info->size;
	}

	if (req->src_len + digest_size > ctx->key_size - 11)
		return -EOVERFLOW;

	if (req->dst_len < ctx->key_size) {
		req->dst_len = ctx->key_size;
		return -EOVERFLOW;
	}

	if (ctx->key_size > PAGE_SIZE)
		return -ENOTSUPP;

	/*
	 * Replace both input and output to add the padding in the input and
	 * the potential missing leading zeros in the output.
	 */
	req_ctx->child_req.src = req_ctx->in_sg;
	req_ctx->child_req.src_len = ctx->key_size - 1;
	req_ctx->child_req.dst = req_ctx->out_sg;
	req_ctx->child_req.dst_len = ctx->key_size;

	req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
			(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
			GFP_KERNEL : GFP_ATOMIC);
	if (!req_ctx->in_buf)
		return -ENOMEM;

	ps_end = ctx->key_size - digest_size - req->src_len - 2;
	req_ctx->in_buf[0] = 0x01;
	memset(req_ctx->in_buf + 1, 0xff, ps_end - 1);
	req_ctx->in_buf[ps_end] = 0x00;

	if (digest_info) {
		memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data,
		       digest_info->size);
	}

	pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
			ctx->key_size - 1 - req->src_len, req->src);

	req_ctx->out_buf = kmalloc(ctx->key_size,
			(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
			GFP_KERNEL : GFP_ATOMIC);
	if (!req_ctx->out_buf) {
		kfree(req_ctx->in_buf);
		return -ENOMEM;
	}

	pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
			ctx->key_size, NULL);

	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
			pkcs1pad_encrypt_sign_complete_cb, req);

	err = crypto_akcipher_sign(&req_ctx->child_req);
	if (err != -EINPROGRESS &&
			(err != -EBUSY ||
			 !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
		return pkcs1pad_encrypt_sign_complete(req, err);

	return err;
}
Exemple #6
0
static int pkcs1pad_encrypt(struct akcipher_request *req)
{
	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
	int err;
	unsigned int i, ps_end;

	if (!ctx->key_size)
		return -EINVAL;

	if (req->src_len > ctx->key_size - 11)
		return -EOVERFLOW;

	if (req->dst_len < ctx->key_size) {
		req->dst_len = ctx->key_size;
		return -EOVERFLOW;
	}

	if (ctx->key_size > PAGE_SIZE)
		return -ENOTSUPP;

	/*
	 * Replace both input and output to add the padding in the input and
	 * the potential missing leading zeros in the output.
	 */
	req_ctx->child_req.src = req_ctx->in_sg;
	req_ctx->child_req.src_len = ctx->key_size - 1;
	req_ctx->child_req.dst = req_ctx->out_sg;
	req_ctx->child_req.dst_len = ctx->key_size;

	req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
			(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
			GFP_KERNEL : GFP_ATOMIC);
	if (!req_ctx->in_buf)
		return -ENOMEM;

	ps_end = ctx->key_size - req->src_len - 2;
	req_ctx->in_buf[0] = 0x02;
	for (i = 1; i < ps_end; i++)
		req_ctx->in_buf[i] = 1 + prandom_u32_max(255);
	req_ctx->in_buf[ps_end] = 0x00;

	pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
			ctx->key_size - 1 - req->src_len, req->src);

	req_ctx->out_buf = kmalloc(ctx->key_size,
			(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
			GFP_KERNEL : GFP_ATOMIC);
	if (!req_ctx->out_buf) {
		kfree(req_ctx->in_buf);
		return -ENOMEM;
	}

	pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
			ctx->key_size, NULL);

	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
			pkcs1pad_encrypt_sign_complete_cb, req);

	err = crypto_akcipher_encrypt(&req_ctx->child_req);
	if (err != -EINPROGRESS &&
			(err != -EBUSY ||
			 !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
		return pkcs1pad_encrypt_sign_complete(req, err);

	return err;
}