[PATCH RFC v4 3/4] 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
---
crypto/Kconfig |7 +
crypto/Makefile |1
crypto/rsa.c| 289 +++
3 files changed, 297 insertions(+)
create mode 100644 crypto/rsa.c
diff --git a/crypto/Kconfig b/crypto/Kconfig
index d119b38..4d1bff3 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -97,6 +97,13 @@ config CRYPTO_AKCIPHER
help
Crypto API interface for public key algorithms.
+config CRYPTO_RSA
+ tristate "RSA algorithm"
+ select AKCIPHER
+ select MPILIB
+ help
+ Generic implementation of the RSA public key algorithm.
+
config CRYPTO_MANAGER
tristate "Cryptographic algorithm manager"
select CRYPTO_MANAGER2
diff --git a/crypto/Makefile b/crypto/Makefile
index 6f2940a..7ba05f0 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
obj-$(CONFIG_CRYPTO_PCOMP2) += pcompress.o
obj-$(CONFIG_CRYPTO_AKCIPHER) += akcipher.o
+obj-$(CONFIG_CRYPTO_RSA) += rsa.o
cryptomgr-y := algboss.o testmgr.o
diff --git a/crypto/rsa.c b/crypto/rsa.c
new file mode 100644
index 000..8efef17
--- /dev/null
+++ b/crypto/rsa.c
@@ -0,0 +1,289 @@
+/* RSA asymmetric public-key algorithm [RFC3447]
+ *
+ * Copyright (c) 2015, Intel Corporation
+ * Authors: Tadeusz Struk
+ *
+ * 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
+#include
+#include
+#include
+
+/*
+ * RSAEP function [RFC3447 sec 5.1.1]
+ * c = m^e mod n;
+ */
+static int _rsa_enc(const struct public_key *key, MPI c, MPI m)
+{
+ /* (1) Validate 0 <= m < n */
+ if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->rsa.n) >= 0)
+ return -EINVAL;
+
+ /* (2) c = m^e mod n */
+ return mpi_powm(c, m, key->rsa.e, key->rsa.n);
+}
+
+/*
+ * RSADP function [RFC3447 sec 5.1.2]
+ * m = c^d mod n;
+ */
+static int _rsa_dec(const struct public_key *key, MPI m, MPI c)
+{
+ /* (1) Validate 0 <= c < n */
+ if (mpi_cmp_ui(c, 0) < 0 || mpi_cmp(c, key->rsa.n) >= 0)
+ return -EINVAL;
+
+ /* (2) m = c^d mod n */
+ return mpi_powm(m, c, key->rsa.d, key->rsa.n);
+}
+
+/*
+ * RSASP1 function [RFC3447 sec 5.2.1]
+ * s = m^d mod n
+ */
+static int _rsa_sign(const struct public_key *key, MPI s, MPI m)
+{
+ /* (1) Validate 0 <= m < n */
+ if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->rsa.n) >= 0)
+ return -EINVAL;
+
+ /* (2) s = m^d mod n */
+ return mpi_powm(s, m, key->rsa.d, key->rsa.n);
+}
+
+/*
+ * RSAVP1 function [RFC3447 sec 5.2.2]
+ * m = s^e mod n;
+ */
+static int _rsa_verify(const struct public_key *key, MPI m, MPI s)
+{
+ /* (1) Validate 0 <= s < n */
+ if (mpi_cmp_ui(s, 0) < 0 || mpi_cmp(s, key->rsa.n) >= 0)
+ return -EINVAL;
+
+ /* (2) m = s^e mod n */
+ return mpi_powm(m, s, key->rsa.e, key->rsa.n);
+}
+
+static int rsa_enc(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = akcipher_request_get_tfm(req);
+ const struct public_key *pkey = crypto_akcipher_getkey(tfm);
+ MPI m, c = mpi_alloc(0);
+ unsigned int len;
+ int ret = 0;
+ int sign;
+
+ if (!c)
+ return -ENOMEM;
+
+ if (!pkey->rsa.e || req->dst_len < mpi_get_size(pkey->rsa.n))
+ return -EINVAL;
+
+ 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, , );
+ if (ret)
+ goto err_free_m;
+
+ if (sign < 0) {
+ ret = -EBADMSG;
+ goto err_free_m;
+ }
+
+ if (req->result_len)
+ *req->result_len = len;
+
+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 = akcipher_request_get_tfm(req);
+ const struct public_key *pkey = crypto_akcipher_getkey(tfm);
+ MPI c, m = mpi_alloc(0);
+ unsigned int len;
+ int ret = 0;
+ int sign;
+
+ if (!m)
+ return -ENOMEM;
+
+ if (!pkey->rsa.d || req->dst_len < mpi_get_size(pkey->rsa.n))
+ return -EINVAL;
+
+ 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,
[PATCH RFC v4 3/4] 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.st...@intel.com
---
crypto/Kconfig |7 +
crypto/Makefile |1
crypto/rsa.c| 289 +++
3 files changed, 297 insertions(+)
create mode 100644 crypto/rsa.c
diff --git a/crypto/Kconfig b/crypto/Kconfig
index d119b38..4d1bff3 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -97,6 +97,13 @@ config CRYPTO_AKCIPHER
help
Crypto API interface for public key algorithms.
+config CRYPTO_RSA
+ tristate RSA algorithm
+ select AKCIPHER
+ select MPILIB
+ help
+ Generic implementation of the RSA public key algorithm.
+
config CRYPTO_MANAGER
tristate Cryptographic algorithm manager
select CRYPTO_MANAGER2
diff --git a/crypto/Makefile b/crypto/Makefile
index 6f2940a..7ba05f0 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
obj-$(CONFIG_CRYPTO_PCOMP2) += pcompress.o
obj-$(CONFIG_CRYPTO_AKCIPHER) += akcipher.o
+obj-$(CONFIG_CRYPTO_RSA) += rsa.o
cryptomgr-y := algboss.o testmgr.o
diff --git a/crypto/rsa.c b/crypto/rsa.c
new file mode 100644
index 000..8efef17
--- /dev/null
+++ b/crypto/rsa.c
@@ -0,0 +1,289 @@
+/* RSA asymmetric public-key algorithm [RFC3447]
+ *
+ * Copyright (c) 2015, Intel Corporation
+ * Authors: Tadeusz Struk tadeusz.st...@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 linux/scatterlist.h
+#include crypto/public_key.h
+#include crypto/akcipher.h
+
+/*
+ * RSAEP function [RFC3447 sec 5.1.1]
+ * c = m^e mod n;
+ */
+static int _rsa_enc(const struct public_key *key, MPI c, MPI m)
+{
+ /* (1) Validate 0 = m n */
+ if (mpi_cmp_ui(m, 0) 0 || mpi_cmp(m, key-rsa.n) = 0)
+ return -EINVAL;
+
+ /* (2) c = m^e mod n */
+ return mpi_powm(c, m, key-rsa.e, key-rsa.n);
+}
+
+/*
+ * RSADP function [RFC3447 sec 5.1.2]
+ * m = c^d mod n;
+ */
+static int _rsa_dec(const struct public_key *key, MPI m, MPI c)
+{
+ /* (1) Validate 0 = c n */
+ if (mpi_cmp_ui(c, 0) 0 || mpi_cmp(c, key-rsa.n) = 0)
+ return -EINVAL;
+
+ /* (2) m = c^d mod n */
+ return mpi_powm(m, c, key-rsa.d, key-rsa.n);
+}
+
+/*
+ * RSASP1 function [RFC3447 sec 5.2.1]
+ * s = m^d mod n
+ */
+static int _rsa_sign(const struct public_key *key, MPI s, MPI m)
+{
+ /* (1) Validate 0 = m n */
+ if (mpi_cmp_ui(m, 0) 0 || mpi_cmp(m, key-rsa.n) = 0)
+ return -EINVAL;
+
+ /* (2) s = m^d mod n */
+ return mpi_powm(s, m, key-rsa.d, key-rsa.n);
+}
+
+/*
+ * RSAVP1 function [RFC3447 sec 5.2.2]
+ * m = s^e mod n;
+ */
+static int _rsa_verify(const struct public_key *key, MPI m, MPI s)
+{
+ /* (1) Validate 0 = s n */
+ if (mpi_cmp_ui(s, 0) 0 || mpi_cmp(s, key-rsa.n) = 0)
+ return -EINVAL;
+
+ /* (2) m = s^e mod n */
+ return mpi_powm(m, s, key-rsa.e, key-rsa.n);
+}
+
+static int rsa_enc(struct akcipher_request *req)
+{
+ struct crypto_akcipher *tfm = akcipher_request_get_tfm(req);
+ const struct public_key *pkey = crypto_akcipher_getkey(tfm);
+ MPI m, c = mpi_alloc(0);
+ unsigned int len;
+ int ret = 0;
+ int sign;
+
+ if (!c)
+ return -ENOMEM;
+
+ if (!pkey-rsa.e || req-dst_len mpi_get_size(pkey-rsa.n))
+ return -EINVAL;
+
+ 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, len, sign);
+ if (ret)
+ goto err_free_m;
+
+ if (sign 0) {
+ ret = -EBADMSG;
+ goto err_free_m;
+ }
+
+ if (req-result_len)
+ *req-result_len = len;
+
+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 = akcipher_request_get_tfm(req);
+ const struct public_key *pkey = crypto_akcipher_getkey(tfm);
+ MPI c, m = mpi_alloc(0);
+ unsigned int len;
+ int ret = 0;
+ int sign;
+
+ if (!m)
+ return -ENOMEM;
+
+ if (!pkey-rsa.d || req-dst_len mpi_get_size(pkey-rsa.n))
+ return -EINVAL;
+
+ 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
