Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 679 insertions, 0 deletions

diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
new file mode 100644
index 000000000..812476e46
--- /dev/null
+++ b/crypto/rsa-pkcs1pad.c
@@ -0,0 +1,679 @@
+/*
+ * RSA padding templates.
+ *
+ * Copyright (c) 2015  Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/akcipher.h>
+#include <crypto/internal/akcipher.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/random.h>
+
+/*
+ * Hash algorithm OIDs plus ASN.1 DER wrappings [RFC4880 sec 5.2.2].
+ */
+static const u8 rsa_digest_info_md5[] = {
+	0x30, 0x20, 0x30, 0x0c, 0x06, 0x08,
+	0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, /* OID */
+	0x05, 0x00, 0x04, 0x10
+};
+
+static const u8 rsa_digest_info_sha1[] = {
+	0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
+	0x2b, 0x0e, 0x03, 0x02, 0x1a,
+	0x05, 0x00, 0x04, 0x14
+};
+
+static const u8 rsa_digest_info_rmd160[] = {
+	0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
+	0x2b, 0x24, 0x03, 0x02, 0x01,
+	0x05, 0x00, 0x04, 0x14
+};
+
+static const u8 rsa_digest_info_sha224[] = {
+	0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09,
+	0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04,
+	0x05, 0x00, 0x04, 0x1c
+};
+
+static const u8 rsa_digest_info_sha256[] = {
+	0x30, 0x31, 0x30, 0x0d, 0x06, 0x09,
+	0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01,
+	0x05, 0x00, 0x04, 0x20
+};
+
+static const u8 rsa_digest_info_sha384[] = {
+	0x30, 0x41, 0x30, 0x0d, 0x06, 0x09,
+	0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02,
+	0x05, 0x00, 0x04, 0x30
+};
+
+static const u8 rsa_digest_info_sha512[] = {
+	0x30, 0x51, 0x30, 0x0d, 0x06, 0x09,
+	0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03,
+	0x05, 0x00, 0x04, 0x40
+};
+
+static const struct rsa_asn1_template {
+	const char	*name;
+	const u8	*data;
+	size_t		size;
+} rsa_asn1_templates[] = {
+#define _(X) { #X, rsa_digest_info_##X, sizeof(rsa_digest_info_##X) }
+	_(md5),
+	_(sha1),
+	_(rmd160),
+	_(sha256),
+	_(sha384),
+	_(sha512),
+	_(sha224),
+	{ NULL }
+#undef _
+};
+
+static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
+{
+	const struct rsa_asn1_template *p;
+
+	for (p = rsa_asn1_templates; p->name; p++)
+		if (strcmp(name, p->name) == 0)
+			return p;
+	return NULL;
+}
+
+struct pkcs1pad_ctx {
+	struct crypto_akcipher *child;
+	unsigned int key_size;
+};
+
+struct pkcs1pad_inst_ctx {
+	struct crypto_akcipher_spawn spawn;
+	const struct rsa_asn1_template *digest_info;
+};
+
+struct pkcs1pad_request {
+	struct scatterlist in_sg[2], out_sg[1];
+	uint8_t *in_buf, *out_buf;
+	struct akcipher_request child_req;
+};
+
+static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
+		unsigned int keylen)
+{
+	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
+	int err;
+
+	ctx->key_size = 0;
+
+	err = crypto_akcipher_set_pub_key(ctx->child, key, keylen);
+	if (err)
+		return err;
+
+	/* Find out new modulus size from rsa implementation */
+	err = crypto_akcipher_maxsize(ctx->child);
+	if (err > PAGE_SIZE)
+		return -ENOTSUPP;
+
+	ctx->key_size = err;
+	return 0;
+}
+
+static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
+		unsigned int keylen)
+{
+	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
+	int err;
+
+	ctx->key_size = 0;
+
+	err = crypto_akcipher_set_priv_key(ctx->child, key, keylen);
+	if (err)
+		return err;
+
+	/* Find out new modulus size from rsa implementation */
+	err = crypto_akcipher_maxsize(ctx->child);
+	if (err > PAGE_SIZE)
+		return -ENOTSUPP;
+
+	ctx->key_size = err;
+	return 0;
+}
+
+static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)
+{
+	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	/*
+	 * The maximum destination buffer size for the encrypt/sign operations
+	 * will be the same as for RSA, even though it's smaller for
+	 * decrypt/verify.
+	 */
+
+	return ctx->key_size;
+}
+
+static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len,
+		struct scatterlist *next)
+{
+	int nsegs = next ? 2 : 1;
+
+	sg_init_table(sg, nsegs);
+	sg_set_buf(sg, buf, len);
+
+	if (next)
+		sg_chain(sg, nsegs, next);
+}
+
+static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err)
+{
+	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);
+	unsigned int pad_len;
+	unsigned int len;
+	u8 *out_buf;
+
+	if (err)
+		goto out;
+
+	len = req_ctx->child_req.dst_len;
+	pad_len = ctx->key_size - len;
+
+	/* Four billion to one */
+	if (likely(!pad_len))
+		goto out;
+
+	out_buf = kzalloc(ctx->key_size, GFP_KERNEL);
+	err = -ENOMEM;
+	if (!out_buf)
+		goto out;
+
+	sg_copy_to_buffer(req->dst, sg_nents_for_len(req->dst, len),
+			  out_buf + pad_len, len);
+	sg_copy_from_buffer(req->dst,
+			    sg_nents_for_len(req->dst, ctx->key_size),
+			    out_buf, ctx->key_size);
+	kzfree(out_buf);
+
+out:
+	req->dst_len = ctx->key_size;
+
+	kfree(req_ctx->in_buf);
+
+	return err;
+}
+
+static void pkcs1pad_encrypt_sign_complete_cb(
+		struct crypto_async_request *child_async_req, int err)
+{
+	struct akcipher_request *req = child_async_req->data;
+	struct crypto_async_request async_req;
+
+	if (err == -EINPROGRESS)
+		return;
+
+	async_req.data = req->base.data;
+	async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
+	async_req.flags = child_async_req->flags;
+	req->base.complete(&async_req,
+			pkcs1pad_encrypt_sign_complete(req, err));
+}
+
+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;
+}
+
+static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err)
+{
+	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);
+	unsigned int dst_len;
+	unsigned int pos;
+	u8 *out_buf;
+
+	if (err)
+		goto done;
+
+	err = -EINVAL;
+	dst_len = req_ctx->child_req.dst_len;
+	if (dst_len < ctx->key_size - 1)
+		goto done;
+
+	out_buf = req_ctx->out_buf;
+	if (dst_len == ctx->key_size) {
+		if (out_buf[0] != 0x00)
+			/* Decrypted value had no leading 0 byte */
+			goto done;
+
+		dst_len--;
+		out_buf++;
+	}
+
+	if (out_buf[0] != 0x02)
+		goto done;
+
+	for (pos = 1; pos < dst_len; pos++)
+		if (out_buf[pos] == 0x00)
+			break;
+	if (pos < 9 || pos == dst_len)
+		goto done;
+	pos++;
+
+	err = 0;
+
+	if (req->dst_len < dst_len - pos)
+		err = -EOVERFLOW;
+	req->dst_len = dst_len - pos;
+
+	if (!err)
+		sg_copy_from_buffer(req->dst,
+				sg_nents_for_len(req->dst, req->dst_len),
+				out_buf + pos, req->dst_len);
+
+done:
+	kzfree(req_ctx->out_buf);
+
+	return err;
+}
+
+static void pkcs1pad_decrypt_complete_cb(
+		struct crypto_async_request *child_async_req, int err)
+{
+	struct akcipher_request *req = child_async_req->data;
+	struct crypto_async_request async_req;
+
+	if (err == -EINPROGRESS)
+		return;
+
+	async_req.data = req->base.data;
+	async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
+	async_req.flags = child_async_req->flags;
+	req->base.complete(&async_req, pkcs1pad_decrypt_complete(req, err));
+}
+
+static int pkcs1pad_decrypt(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_decrypt_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_decrypt(&req_ctx->child_req);
+	if (err != -EINPROGRESS && err != -EBUSY)
+		return pkcs1pad_decrypt_complete(req, err);
+
+	return err;
+}
+
+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;
+
+	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;
+
+	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;
+}
+
+static int pkcs1pad_verify_complete(struct akcipher_request *req, int err)
+{
+	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;
+	unsigned int dst_len;
+	unsigned int pos;
+	u8 *out_buf;
+
+	if (err)
+		goto done;
+
+	err = -EINVAL;
+	dst_len = req_ctx->child_req.dst_len;
+	if (dst_len < ctx->key_size - 1)
+		goto done;
+
+	out_buf = req_ctx->out_buf;
+	if (dst_len == ctx->key_size) {
+		if (out_buf[0] != 0x00)
+			/* Decrypted value had no leading 0 byte */
+			goto done;
+
+		dst_len--;
+		out_buf++;
+	}
+
+	err = -EBADMSG;
+	if (out_buf[0] != 0x01)
+		goto done;
+
+	for (pos = 1; pos < dst_len; pos++)
+		if (out_buf[pos] != 0xff)
+			break;
+
+	if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00)
+		goto done;
+	pos++;
+
+	if (crypto_memneq(out_buf + pos, digest_info->data, digest_info->size))
+		goto done;
+
+	pos += digest_info->size;
+
+	err = 0;
+
+	if (req->dst_len < dst_len - pos)
+		err = -EOVERFLOW;
+	req->dst_len = dst_len - pos;
+
+	if (!err)
+		sg_copy_from_buffer(req->dst,
+				sg_nents_for_len(req->dst, req->dst_len),
+				out_buf + pos, req->dst_len);
+done:
+	kzfree(req_ctx->out_buf);
+
+	return err;
+}
+
+static void pkcs1pad_verify_complete_cb(
+		struct crypto_async_request *child_async_req, int err)
+{
+	struct akcipher_request *req = child_async_req->data;
+	struct crypto_async_request async_req;
+
+	if (err == -EINPROGRESS)
+		return;
+
+	async_req.data = req->base.data;
+	async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
+	async_req.flags = child_async_req->flags;
+	req->base.complete(&async_req, pkcs1pad_verify_complete(req, err));
+}
+
+/*
+ * 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;
+}
+
+static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm)
+{
+	struct akcipher_instance *inst = akcipher_alg_instance(tfm);
+	struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
+	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct crypto_akcipher *child_tfm;
+
+	child_tfm = crypto_spawn_akcipher(&ictx->spawn);
+	if (IS_ERR(child_tfm))
+		return PTR_ERR(child_tfm);
+
+	ctx->child = child_tfm;
+	return 0;
+}
+
+static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm)
+{
+	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	crypto_free_akcipher(ctx->child);
+}
+
+static void pkcs1pad_free(struct akcipher_instance *inst)
+{
+	struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst);
+	struct crypto_akcipher_spawn *spawn = &ctx->spawn;
+
+	crypto_drop_akcipher(spawn);
+	kfree(inst);
+}
+
+static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
+{
+	const struct rsa_asn1_template *digest_info;
+	struct crypto_attr_type *algt;
+	struct akcipher_instance *inst;
+	struct pkcs1pad_inst_ctx *ctx;
+	struct crypto_akcipher_spawn *spawn;
+	struct akcipher_alg *rsa_alg;
+	const char *rsa_alg_name;
+	const char *hash_name;
+	int err;
+
+	algt = crypto_get_attr_type(tb);
+	if (IS_ERR(algt))
+		return PTR_ERR(algt);
+
+	if ((algt->type ^ CRYPTO_ALG_TYPE_AKCIPHER) & algt->mask)
+		return -EINVAL;
+
+	rsa_alg_name = crypto_attr_alg_name(tb[1]);
+	if (IS_ERR(rsa_alg_name))
+		return PTR_ERR(rsa_alg_name);
+
+	hash_name = crypto_attr_alg_name(tb[2]);
+	if (IS_ERR(hash_name))
+		return PTR_ERR(hash_name);
+
+	digest_info = rsa_lookup_asn1(hash_name);
+	if (!digest_info)
+		return -EINVAL;
+
+	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
+	if (!inst)
+		return -ENOMEM;
+
+	ctx = akcipher_instance_ctx(inst);
+	spawn = &ctx->spawn;
+	ctx->digest_info = digest_info;
+
+	crypto_set_spawn(&spawn->base, akcipher_crypto_instance(inst));
+	err = crypto_grab_akcipher(spawn, rsa_alg_name, 0,
+			crypto_requires_sync(algt->type, algt->mask));
+	if (err)
+		goto out_free_inst;
+
+	rsa_alg = crypto_spawn_akcipher_alg(spawn);
+
+	err = -ENAMETOOLONG;
+
+	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
+		     "pkcs1pad(%s,%s)", rsa_alg->base.cra_name, hash_name) >=
+	    CRYPTO_MAX_ALG_NAME ||
+	    snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+		     "pkcs1pad(%s,%s)",
+		     rsa_alg->base.cra_driver_name, hash_name) >=
+	    CRYPTO_MAX_ALG_NAME)
+		goto out_drop_alg;
+
+	inst->alg.base.cra_flags = rsa_alg->base.cra_flags & CRYPTO_ALG_ASYNC;
+	inst->alg.base.cra_priority = rsa_alg->base.cra_priority;
+	inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx);
+
+	inst->alg.init = pkcs1pad_init_tfm;
+	inst->alg.exit = pkcs1pad_exit_tfm;
+
+	inst->alg.encrypt = pkcs1pad_encrypt;
+	inst->alg.decrypt = pkcs1pad_decrypt;
+	inst->alg.sign = pkcs1pad_sign;
+	inst->alg.verify = pkcs1pad_verify;
+	inst->alg.set_pub_key = pkcs1pad_set_pub_key;
+	inst->alg.set_priv_key = pkcs1pad_set_priv_key;
+	inst->alg.max_size = pkcs1pad_get_max_size;
+	inst->alg.reqsize = sizeof(struct pkcs1pad_request) + rsa_alg->reqsize;
+
+	inst->free = pkcs1pad_free;
+
+	err = akcipher_register_instance(tmpl, inst);
+	if (err)
+		goto out_drop_alg;
+
+	return 0;
+
+out_drop_alg:
+	crypto_drop_akcipher(spawn);
+out_free_inst:
+	kfree(inst);
+	return err;
+}
+
+struct crypto_template rsa_pkcs1pad_tmpl = {
+	.name = "pkcs1pad",
+	.create = pkcs1pad_create,
+	.module = THIS_MODULE,
+};