crypto: rsa - add a new rsa generic implementation
Add a new rsa generic SW implementation.
This implements only cryptographic primitives.
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Added select on ASN1.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/rsa.c b/crypto/rsa.c
new file mode 100644
index 0000000..752af06
--- /dev/null
+++ b/crypto/rsa.c
@@ -0,0 +1,315 @@
+/* RSA asymmetric public-key algorithm [RFC3447]
+ *
+ * Copyright (c) 2015, Intel Corporation
+ * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <crypto/internal/rsa.h>
+#include <crypto/internal/akcipher.h>
+#include <crypto/akcipher.h>
+
+/*
+ * RSAEP function [RFC3447 sec 5.1.1]
+ * c = m^e mod n;
+ */
+static int _rsa_enc(const struct rsa_key *key, MPI c, MPI m)
+{
+ /* (1) Validate 0 <= m < n */
+ if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0)
+ return -EINVAL;
+
+ /* (2) c = m^e mod n */
+ return mpi_powm(c, m, key->e, key->n);
+}
+
+/*
+ * RSADP function [RFC3447 sec 5.1.2]
+ * m = c^d mod n;
+ */
+static int _rsa_dec(const struct rsa_key *key, MPI m, MPI c)
+{
+ /* (1) Validate 0 <= c < n */
+ if (mpi_cmp_ui(c, 0) < 0 || mpi_cmp(c, key->n) >= 0)
+ return -EINVAL;
+
+ /* (2) m = c^d mod n */
+ return mpi_powm(m, c, key->d, key->n);
+}
+
+/*
+ * RSASP1 function [RFC3447 sec 5.2.1]
+ * s = m^d mod n
+ */
+static int _rsa_sign(const struct rsa_key *key, MPI s, MPI m)
+{
+ /* (1) Validate 0 <= m < n */
+ if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0)
+ return -EINVAL;
+
+ /* (2) s = m^d mod n */
+ return mpi_powm(s, m, key->d, key->n);
+}
+
+/*
+ * RSAVP1 function [RFC3447 sec 5.2.2]
+ * m = s^e mod n;
+ */
+static int _rsa_verify(const struct rsa_key *key, MPI m, MPI s)
+{
+ /* (1) Validate 0 <= s < n */
+ if (mpi_cmp_ui(s, 0) < 0 || mpi_cmp(s, key->n) >= 0)
+ return -EINVAL;
+
+ /* (2) m = s^e mod n */
+ return mpi_powm(m, s, key->e, key->n);
+}
+
+static inline struct rsa_key *rsa_get_key(struct crypto_akcipher *tfm)
+{
+ return akcipher_tfm_ctx(tfm);
+}
+
+static int rsa_enc(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ const struct rsa_key *pkey = rsa_get_key(tfm);
+ MPI m, c = mpi_alloc(0);
+ int ret = 0;
+ int sign;
+
+ if (!c)
+ return -ENOMEM;
+
+ if (unlikely(!pkey->n || !pkey->e)) {
+ ret = -EINVAL;
+ goto err_free_c;
+ }
+
+ if (req->dst_len < mpi_get_size(pkey->n)) {
+ req->dst_len = mpi_get_size(pkey->n);
+ ret = -EOVERFLOW;
+ goto err_free_c;
+ }
+
+ m = mpi_read_raw_data(req->src, req->src_len);
+ if (!m) {
+ ret = -ENOMEM;
+ goto err_free_c;
+ }
+
+ ret = _rsa_enc(pkey, c, m);
+ if (ret)
+ goto err_free_m;
+
+ ret = mpi_read_buffer(c, req->dst, req->dst_len, &req->dst_len, &sign);
+ if (ret)
+ goto err_free_m;
+
+ if (sign < 0) {
+ ret = -EBADMSG;
+ goto err_free_m;
+ }
+
+err_free_m:
+ mpi_free(m);
+err_free_c:
+ mpi_free(c);
+ return ret;
+}
+
+static int rsa_dec(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ const struct rsa_key *pkey = rsa_get_key(tfm);
+ MPI c, m = mpi_alloc(0);
+ int ret = 0;
+ int sign;
+
+ if (!m)
+ return -ENOMEM;
+
+ if (unlikely(!pkey->n || !pkey->d)) {
+ ret = -EINVAL;
+ goto err_free_m;
+ }
+
+ if (req->dst_len < mpi_get_size(pkey->n)) {
+ req->dst_len = mpi_get_size(pkey->n);
+ ret = -EOVERFLOW;
+ goto err_free_m;
+ }
+
+ c = mpi_read_raw_data(req->src, req->src_len);
+ if (!c) {
+ ret = -ENOMEM;
+ goto err_free_m;
+ }
+
+ ret = _rsa_dec(pkey, m, c);
+ if (ret)
+ goto err_free_c;
+
+ ret = mpi_read_buffer(m, req->dst, req->dst_len, &req->dst_len, &sign);
+ if (ret)
+ goto err_free_c;
+
+ if (sign < 0) {
+ ret = -EBADMSG;
+ goto err_free_c;
+ }
+
+err_free_c:
+ mpi_free(c);
+err_free_m:
+ mpi_free(m);
+ return ret;
+}
+
+static int rsa_sign(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ const struct rsa_key *pkey = rsa_get_key(tfm);
+ MPI m, s = mpi_alloc(0);
+ int ret = 0;
+ int sign;
+
+ if (!s)
+ return -ENOMEM;
+
+ if (unlikely(!pkey->n || !pkey->d)) {
+ ret = -EINVAL;
+ goto err_free_s;
+ }
+
+ if (req->dst_len < mpi_get_size(pkey->n)) {
+ req->dst_len = mpi_get_size(pkey->n);
+ ret = -EOVERFLOW;
+ goto err_free_s;
+ }
+
+ m = mpi_read_raw_data(req->src, req->src_len);
+ if (!m) {
+ ret = -ENOMEM;
+ goto err_free_s;
+ }
+
+ ret = _rsa_sign(pkey, s, m);
+ if (ret)
+ goto err_free_m;
+
+ ret = mpi_read_buffer(s, req->dst, req->dst_len, &req->dst_len, &sign);
+ if (ret)
+ goto err_free_m;
+
+ if (sign < 0) {
+ ret = -EBADMSG;
+ goto err_free_m;
+ }
+
+err_free_m:
+ mpi_free(m);
+err_free_s:
+ mpi_free(s);
+ return ret;
+}
+
+static int rsa_verify(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ const struct rsa_key *pkey = rsa_get_key(tfm);
+ MPI s, m = mpi_alloc(0);
+ int ret = 0;
+ int sign;
+
+ if (!m)
+ return -ENOMEM;
+
+ if (unlikely(!pkey->n || !pkey->e)) {
+ ret = -EINVAL;
+ goto err_free_m;
+ }
+
+ if (req->dst_len < mpi_get_size(pkey->n)) {
+ req->dst_len = mpi_get_size(pkey->n);
+ ret = -EOVERFLOW;
+ goto err_free_m;
+ }
+
+ s = mpi_read_raw_data(req->src, req->src_len);
+ if (!s) {
+ ret = -ENOMEM;
+ goto err_free_m;
+ }
+
+ ret = _rsa_verify(pkey, m, s);
+ if (ret)
+ goto err_free_s;
+
+ ret = mpi_read_buffer(m, req->dst, req->dst_len, &req->dst_len, &sign);
+ if (ret)
+ goto err_free_s;
+
+ if (sign < 0) {
+ ret = -EBADMSG;
+ goto err_free_s;
+ }
+
+err_free_s:
+ mpi_free(s);
+err_free_m:
+ mpi_free(m);
+ return ret;
+}
+
+static int rsa_setkey(struct crypto_akcipher *tfm, const void *key,
+ unsigned int keylen)
+{
+ struct rsa_key *pkey = akcipher_tfm_ctx(tfm);
+
+ return rsa_parse_key(pkey, key, keylen);
+}
+
+static void rsa_exit_tfm(struct crypto_akcipher *tfm)
+{
+ struct rsa_key *pkey = akcipher_tfm_ctx(tfm);
+
+ rsa_free_key(pkey);
+}
+
+static struct akcipher_alg rsa = {
+ .encrypt = rsa_enc,
+ .decrypt = rsa_dec,
+ .sign = rsa_sign,
+ .verify = rsa_verify,
+ .setkey = rsa_setkey,
+ .exit = rsa_exit_tfm,
+ .base = {
+ .cra_name = "rsa",
+ .cra_driver_name = "rsa-generic",
+ .cra_priority = 100,
+ .cra_module = THIS_MODULE,
+ .cra_ctxsize = sizeof(struct rsa_key),
+ },
+};
+
+static int rsa_init(void)
+{
+ return crypto_register_akcipher(&rsa);
+}
+
+static void rsa_exit(void)
+{
+ crypto_unregister_akcipher(&rsa);
+}
+
+module_init(rsa_init);
+module_exit(rsa_exit);
+MODULE_ALIAS_CRYPTO("rsa");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("RSA generic algorithm");
