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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>
This commit is contained in:
Tadeusz Struk
Herbert Xu
parent
3c339ab83f
commit
cfc2bb32b3
@ -100,6 +100,14 @@ config CRYPTO_AKCIPHER
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select CRYPTO_AKCIPHER2
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select CRYPTO_ALGAPI
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config CRYPTO_RSA
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tristate "RSA algorithm"
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select AKCIPHER
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select MPILIB
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select ASN1
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help
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Generic implementation of the RSA public key algorithm.
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config CRYPTO_MANAGER
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tristate "Cryptographic algorithm manager"
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select CRYPTO_MANAGER2
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@ -30,6 +30,14 @@ obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
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obj-$(CONFIG_CRYPTO_PCOMP2) += pcompress.o
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obj-$(CONFIG_CRYPTO_AKCIPHER2) += akcipher.o
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$(obj)/rsakey-asn1.o: $(obj)/rsakey-asn1.c $(obj)/rsakey-asn1.h
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clean-files += rsakey-asn1.c rsakey-asn1.h
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rsa_generic-y := rsakey-asn1.o
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rsa_generic-y += rsa.o
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rsa_generic-y += rsa_helper.o
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obj-$(CONFIG_CRYPTO_RSA) += rsa_generic.o
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cryptomgr-y := algboss.o testmgr.o
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obj-$(CONFIG_CRYPTO_MANAGER2) += cryptomgr.o
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315
crypto/rsa.c
Normal file
315
crypto/rsa.c
Normal file
@ -0,0 +1,315 @@
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/* RSA asymmetric public-key algorithm [RFC3447]
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*
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* Copyright (c) 2015, Intel Corporation
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* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <crypto/internal/rsa.h>
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#include <crypto/internal/akcipher.h>
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#include <crypto/akcipher.h>
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/*
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* RSAEP function [RFC3447 sec 5.1.1]
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* c = m^e mod n;
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*/
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static int _rsa_enc(const struct rsa_key *key, MPI c, MPI m)
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{
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/* (1) Validate 0 <= m < n */
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if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0)
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return -EINVAL;
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/* (2) c = m^e mod n */
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return mpi_powm(c, m, key->e, key->n);
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}
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/*
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* RSADP function [RFC3447 sec 5.1.2]
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* m = c^d mod n;
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*/
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static int _rsa_dec(const struct rsa_key *key, MPI m, MPI c)
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{
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/* (1) Validate 0 <= c < n */
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if (mpi_cmp_ui(c, 0) < 0 || mpi_cmp(c, key->n) >= 0)
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return -EINVAL;
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/* (2) m = c^d mod n */
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return mpi_powm(m, c, key->d, key->n);
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}
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/*
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* RSASP1 function [RFC3447 sec 5.2.1]
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* s = m^d mod n
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*/
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static int _rsa_sign(const struct rsa_key *key, MPI s, MPI m)
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{
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/* (1) Validate 0 <= m < n */
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if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0)
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return -EINVAL;
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/* (2) s = m^d mod n */
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return mpi_powm(s, m, key->d, key->n);
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}
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/*
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* RSAVP1 function [RFC3447 sec 5.2.2]
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* m = s^e mod n;
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*/
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static int _rsa_verify(const struct rsa_key *key, MPI m, MPI s)
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{
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/* (1) Validate 0 <= s < n */
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if (mpi_cmp_ui(s, 0) < 0 || mpi_cmp(s, key->n) >= 0)
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return -EINVAL;
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/* (2) m = s^e mod n */
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return mpi_powm(m, s, key->e, key->n);
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}
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static inline struct rsa_key *rsa_get_key(struct crypto_akcipher *tfm)
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{
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return akcipher_tfm_ctx(tfm);
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}
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static int rsa_enc(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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const struct rsa_key *pkey = rsa_get_key(tfm);
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MPI m, c = mpi_alloc(0);
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int ret = 0;
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int sign;
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if (!c)
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return -ENOMEM;
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if (unlikely(!pkey->n || !pkey->e)) {
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ret = -EINVAL;
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goto err_free_c;
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}
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if (req->dst_len < mpi_get_size(pkey->n)) {
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req->dst_len = mpi_get_size(pkey->n);
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ret = -EOVERFLOW;
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goto err_free_c;
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}
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m = mpi_read_raw_data(req->src, req->src_len);
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if (!m) {
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ret = -ENOMEM;
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goto err_free_c;
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}
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ret = _rsa_enc(pkey, c, m);
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if (ret)
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goto err_free_m;
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ret = mpi_read_buffer(c, req->dst, req->dst_len, &req->dst_len, &sign);
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if (ret)
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goto err_free_m;
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if (sign < 0) {
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ret = -EBADMSG;
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goto err_free_m;
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}
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err_free_m:
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mpi_free(m);
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err_free_c:
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mpi_free(c);
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return ret;
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}
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static int rsa_dec(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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const struct rsa_key *pkey = rsa_get_key(tfm);
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MPI c, m = mpi_alloc(0);
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int ret = 0;
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int sign;
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if (!m)
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return -ENOMEM;
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if (unlikely(!pkey->n || !pkey->d)) {
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ret = -EINVAL;
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goto err_free_m;
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}
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if (req->dst_len < mpi_get_size(pkey->n)) {
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req->dst_len = mpi_get_size(pkey->n);
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ret = -EOVERFLOW;
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goto err_free_m;
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}
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c = mpi_read_raw_data(req->src, req->src_len);
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if (!c) {
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ret = -ENOMEM;
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goto err_free_m;
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}
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ret = _rsa_dec(pkey, m, c);
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if (ret)
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goto err_free_c;
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ret = mpi_read_buffer(m, req->dst, req->dst_len, &req->dst_len, &sign);
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if (ret)
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goto err_free_c;
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if (sign < 0) {
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ret = -EBADMSG;
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goto err_free_c;
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}
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err_free_c:
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mpi_free(c);
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err_free_m:
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mpi_free(m);
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return ret;
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}
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static int rsa_sign(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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const struct rsa_key *pkey = rsa_get_key(tfm);
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MPI m, s = mpi_alloc(0);
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int ret = 0;
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int sign;
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if (!s)
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return -ENOMEM;
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if (unlikely(!pkey->n || !pkey->d)) {
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ret = -EINVAL;
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goto err_free_s;
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}
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if (req->dst_len < mpi_get_size(pkey->n)) {
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req->dst_len = mpi_get_size(pkey->n);
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ret = -EOVERFLOW;
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goto err_free_s;
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}
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m = mpi_read_raw_data(req->src, req->src_len);
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if (!m) {
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ret = -ENOMEM;
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goto err_free_s;
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}
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ret = _rsa_sign(pkey, s, m);
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if (ret)
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goto err_free_m;
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ret = mpi_read_buffer(s, req->dst, req->dst_len, &req->dst_len, &sign);
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if (ret)
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goto err_free_m;
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if (sign < 0) {
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ret = -EBADMSG;
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goto err_free_m;
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}
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err_free_m:
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mpi_free(m);
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err_free_s:
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mpi_free(s);
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return ret;
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}
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static int rsa_verify(struct akcipher_request *req)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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const struct rsa_key *pkey = rsa_get_key(tfm);
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MPI s, m = mpi_alloc(0);
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int ret = 0;
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int sign;
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if (!m)
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return -ENOMEM;
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if (unlikely(!pkey->n || !pkey->e)) {
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ret = -EINVAL;
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goto err_free_m;
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}
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if (req->dst_len < mpi_get_size(pkey->n)) {
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req->dst_len = mpi_get_size(pkey->n);
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ret = -EOVERFLOW;
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goto err_free_m;
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}
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s = mpi_read_raw_data(req->src, req->src_len);
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if (!s) {
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ret = -ENOMEM;
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goto err_free_m;
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}
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ret = _rsa_verify(pkey, m, s);
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if (ret)
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goto err_free_s;
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ret = mpi_read_buffer(m, req->dst, req->dst_len, &req->dst_len, &sign);
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if (ret)
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goto err_free_s;
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if (sign < 0) {
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ret = -EBADMSG;
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goto err_free_s;
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}
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err_free_s:
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mpi_free(s);
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err_free_m:
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mpi_free(m);
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return ret;
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}
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static int rsa_setkey(struct crypto_akcipher *tfm, const void *key,
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unsigned int keylen)
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{
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struct rsa_key *pkey = akcipher_tfm_ctx(tfm);
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return rsa_parse_key(pkey, key, keylen);
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}
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static void rsa_exit_tfm(struct crypto_akcipher *tfm)
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{
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struct rsa_key *pkey = akcipher_tfm_ctx(tfm);
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rsa_free_key(pkey);
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}
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static struct akcipher_alg rsa = {
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.encrypt = rsa_enc,
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.decrypt = rsa_dec,
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.sign = rsa_sign,
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.verify = rsa_verify,
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.setkey = rsa_setkey,
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.exit = rsa_exit_tfm,
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.base = {
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.cra_name = "rsa",
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.cra_driver_name = "rsa-generic",
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.cra_priority = 100,
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.cra_module = THIS_MODULE,
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.cra_ctxsize = sizeof(struct rsa_key),
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},
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};
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static int rsa_init(void)
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{
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return crypto_register_akcipher(&rsa);
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}
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static void rsa_exit(void)
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{
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crypto_unregister_akcipher(&rsa);
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}
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module_init(rsa_init);
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module_exit(rsa_exit);
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MODULE_ALIAS_CRYPTO("rsa");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("RSA generic algorithm");
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121
crypto/rsa_helper.c
Normal file
121
crypto/rsa_helper.c
Normal file
@ -0,0 +1,121 @@
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/*
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* RSA key extract helper
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*
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* Copyright (c) 2015, Intel Corporation
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* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/err.h>
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#include <linux/fips.h>
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#include <crypto/internal/rsa.h>
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#include "rsakey-asn1.h"
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int rsa_get_n(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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key->n = mpi_read_raw_data(value, vlen);
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if (!key->n)
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return -ENOMEM;
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/* In FIPS mode only allow key size 2K & 3K */
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if (fips_enabled && (mpi_get_size(key->n) != 256 ||
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mpi_get_size(key->n) != 384)) {
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pr_err("RSA: key size not allowed in FIPS mode\n");
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mpi_free(key->n);
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key->n = NULL;
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return -EINVAL;
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}
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return 0;
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}
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int rsa_get_e(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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key->e = mpi_read_raw_data(value, vlen);
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if (!key->e)
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return -ENOMEM;
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return 0;
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}
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int rsa_get_d(void *context, size_t hdrlen, unsigned char tag,
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const void *value, size_t vlen)
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{
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struct rsa_key *key = context;
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key->d = mpi_read_raw_data(value, vlen);
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if (!key->d)
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return -ENOMEM;
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/* In FIPS mode only allow key size 2K & 3K */
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if (fips_enabled && (mpi_get_size(key->d) != 256 ||
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mpi_get_size(key->d) != 384)) {
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pr_err("RSA: key size not allowed in FIPS mode\n");
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mpi_free(key->d);
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key->d = NULL;
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return -EINVAL;
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}
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return 0;
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}
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static void free_mpis(struct rsa_key *key)
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{
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mpi_free(key->n);
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mpi_free(key->e);
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mpi_free(key->d);
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key->n = NULL;
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key->e = NULL;
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key->d = NULL;
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}
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/**
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* rsa_free_key() - frees rsa key allocated by rsa_parse_key()
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*
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* @rsa_key: struct rsa_key key representation
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*/
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void rsa_free_key(struct rsa_key *key)
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{
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free_mpis(key);
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}
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EXPORT_SYMBOL_GPL(rsa_free_key);
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/**
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* rsa_parse_key() - extracts an rsa key from BER encoded buffer
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* and stores it in the provided struct rsa_key
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*
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* @rsa_key: struct rsa_key key representation
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* @key: key in BER format
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* @key_len: length of key
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*
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* Return: 0 on success or error code in case of error
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*/
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int rsa_parse_key(struct rsa_key *rsa_key, const void *key,
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unsigned int key_len)
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{
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int ret;
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free_mpis(rsa_key);
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ret = asn1_ber_decoder(&rsakey_decoder, rsa_key, key, key_len);
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if (ret < 0)
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goto error;
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return 0;
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error:
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free_mpis(rsa_key);
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return ret;
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}
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EXPORT_SYMBOL_GPL(rsa_parse_key);
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5
crypto/rsakey.asn1
Normal file
5
crypto/rsakey.asn1
Normal file
@ -0,0 +1,5 @@
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RsaKey ::= SEQUENCE {
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n INTEGER ({ rsa_get_n }),
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e INTEGER ({ rsa_get_e }),
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d INTEGER ({ rsa_get_d })
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}
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27
include/crypto/internal/rsa.h
Normal file
27
include/crypto/internal/rsa.h
Normal file
@ -0,0 +1,27 @@
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/*
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* RSA internal helpers
|
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*
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* Copyright (c) 2015, Intel Corporation
|
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* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
|
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*
|
||||
* 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.
|
||||
*
|
||||
*/
|
||||
#ifndef _RSA_HELPER_
|
||||
#define _RSA_HELPER_
|
||||
#include <linux/mpi.h>
|
||||
|
||||
struct rsa_key {
|
||||
MPI n;
|
||||
MPI e;
|
||||
MPI d;
|
||||
};
|
||||
|
||||
int rsa_parse_key(struct rsa_key *rsa_key, const void *key,
|
||||
unsigned int key_len);
|
||||
|
||||
void rsa_free_key(struct rsa_key *rsa_key);
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user