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Subject[PATCH 12/19] Add DH implementation and pubkey abstraction layer
Date
Add basic Diffie-Hellman implementation, because it is not provided by
libtomcrypt.

Finally, add an algorithm-independent pubkey interface that encapsulates
the separate pubkey algorithm implementations.
---
crypto/userspace/Makefile | 2 +-
crypto/userspace/ncr-dh.c | 282 +++++++++++++++++++
crypto/userspace/ncr-pk.c | 659 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 942 insertions(+), 1 deletions(-)
create mode 100644 crypto/userspace/ncr-dh.c
create mode 100644 crypto/userspace/ncr-pk.c

diff --git a/crypto/userspace/Makefile b/crypto/userspace/Makefile
index 0891c2b..fa4168d 100644
--- a/crypto/userspace/Makefile
+++ b/crypto/userspace/Makefile
@@ -64,7 +64,7 @@ TOMCRYPT_OBJECTS = libtomcrypt/misc/zeromem.o libtomcrypt/misc/crypt/crypt_argch
libtomcrypt/pk/asn1/der/x509/der_decode_subject_public_key_info.o

cryptodev-objs := cryptodev_main.o cryptodev_cipher.o ncr-limits.o \
- ncr-sessions.o utils.o $(TOMMATH_OBJECTS) \
+ ncr-pk.o ncr-sessions.o ncr-dh.o utils.o $(TOMMATH_OBJECTS) \
$(TOMCRYPT_OBJECTS)


diff --git a/crypto/userspace/ncr-dh.c b/crypto/userspace/ncr-dh.c
new file mode 100644
index 0000000..3a00c0b
--- /dev/null
+++ b/crypto/userspace/ncr-dh.c
@@ -0,0 +1,282 @@
+/*
+ * New driver for /dev/crypto device (aka CryptoDev)
+
+ * Copyright (c) 2010 Katholieke Universiteit Leuven
+ *
+ * Author: Nikos Mavrogiannopoulos <nmav@gnutls.org>
+ *
+ * This file is part of linux cryptodev.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/ioctl.h>
+#include <linux/mm.h>
+#include <linux/ncr.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/uaccess.h>
+#include <linux/scatterlist.h>
+#include <ncr-int.h>
+#include <tomcrypt.h>
+#include <ncr-dh.h>
+
+void dh_free(dh_key * key)
+{
+ mp_clear_multi(&key->p, &key->g, &key->x, NULL);
+}
+
+int dh_import_params(dh_key * key, uint8_t * p, size_t p_size, uint8_t * g,
+ size_t g_size)
+{
+ int ret;
+ int err;
+
+ if ((err =
+ mp_init_multi(&key->p, &key->g, &key->x, &key->y,
+ NULL)) != CRYPT_OK) {
+ err();
+ return -ENOMEM;
+ }
+
+ if ((err =
+ mp_read_unsigned_bin(&key->p, (unsigned char *) p,
+ p_size)) != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(err);
+ goto fail;
+ }
+
+ if ((err =
+ mp_read_unsigned_bin(&key->g, (unsigned char *) g,
+ g_size)) != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(err);
+ goto fail;
+ }
+
+ return 0;
+ fail:
+ mp_clear_multi(&key->p, &key->g, &key->x, &key->y, NULL);
+
+ return ret;
+}
+
+int dh_generate_key(dh_key * key)
+{
+ void *buf;
+ int size;
+ int err, ret;
+
+ size = mp_unsigned_bin_size(&key->p);
+ if (size == 0) {
+ err();
+ return -EINVAL;
+ }
+
+ buf = kmalloc(size, GFP_KERNEL);
+ if (buf == NULL) {
+ err();
+ return -ENOMEM;
+ }
+
+ get_random_bytes(buf, size);
+
+ if ((err = mp_read_unsigned_bin(&key->x, buf, size)) != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(err);
+ goto fail;
+ }
+
+ err = mp_mod(&key->x, &key->p, &key->x);
+ if (err != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(err);
+ goto fail;
+ }
+
+ key->type = PK_PRIVATE;
+
+ ret = 0;
+ fail:
+ kfree(buf);
+
+ return ret;
+
+}
+
+int dh_generate_public(dh_key * public, dh_key * private)
+{
+ int err, ret;
+
+ err =
+ mp_exptmod(&private->g, &private->x, &private->p, &public->y);
+ if (err != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(err);
+ goto fail;
+ }
+
+ public->type = PK_PUBLIC;
+
+ ret = 0;
+ fail:
+
+ return ret;
+}
+
+int dh_export(uint8_t * out, unsigned long * outlen, int type, dh_key * key)
+{
+ unsigned long zero = 0;
+ int err;
+
+ if (out == NULL || outlen == NULL || key == NULL) {
+ err();
+ return -EINVAL;
+ }
+
+ /* can we store the static header? */
+ if (type == PK_PRIVATE && key->type != PK_PRIVATE) {
+ return -EINVAL;
+ }
+
+ if (type != PK_PUBLIC && type != PK_PRIVATE) {
+ return -EINVAL;
+ }
+
+ /* This encoding is different from the one in original
+ * libtomcrypt. It uses a compatible encoding with gnutls
+ * and openssl
+ */
+ if (type == PK_PRIVATE) {
+ err = der_encode_sequence_multi(out, outlen,
+ LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
+ LTC_ASN1_INTEGER, 1UL, &key->p,
+ LTC_ASN1_INTEGER, 1UL, &key->g,
+ LTC_ASN1_INTEGER, 1UL, &key->x,
+ LTC_ASN1_EOL, 0UL, NULL);
+ } else {
+ err = mp_unsigned_bin_size(&key->y);
+ if (err > *outlen) {
+ err();
+ return -EOVERFLOW;
+ }
+
+ *outlen = err;
+
+ err = mp_to_unsigned_bin(&key->y, out);
+ }
+
+ if (err != CRYPT_OK) {
+ err();
+ return _ncr_tomerr(err);
+ }
+
+ return 0;
+}
+
+int dh_import(const uint8_t * in, size_t inlen, dh_key * key)
+{
+ int err;
+ unsigned long zero = 0;
+
+ if (in == NULL || key == NULL) {
+ err();
+ return -EINVAL;
+ }
+
+ /* init key */
+ if (mp_init_multi
+ (&key->p, &key->g, &key->x, &key->y, NULL) != CRYPT_OK) {
+ return -ENOMEM;
+ }
+
+ /* get key type */
+ if ((err = der_decode_sequence_multi(in, inlen,
+ LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
+ LTC_ASN1_INTEGER, 1UL, &key->p,
+ LTC_ASN1_INTEGER, 1UL, &key->g,
+ LTC_ASN1_INTEGER, 1UL, &key->x,
+ LTC_ASN1_EOL, 0UL, NULL)) == CRYPT_OK) {
+ key->type = PK_PRIVATE;
+ } else { /* public */
+ err = mp_read_unsigned_bin(&key->y, in, inlen);
+ key->type = PK_PUBLIC;
+ }
+
+ if (err != CRYPT_OK) {
+ goto LBL_ERR;
+ }
+
+ return 0;
+
+ LBL_ERR:
+ mp_clear_multi(&key->p, &key->g, &key->x, &key->y, NULL);
+ return _ncr_tomerr(err);
+}
+
+int dh_derive_gxy(struct key_item_st* newkey, dh_key * key,
+ void* pk, size_t pk_size)
+{
+int ret, err;
+mp_int y, gxy;
+ /* newkey will be a secret key with value of g^{xy}
+ */
+
+ if (mp_init_multi(&y, &gxy, NULL) != CRYPT_OK) {
+ err();
+ return -ENOMEM;
+ }
+
+ if (key->type != PK_PRIVATE) {
+ err();
+ return -EINVAL;
+ }
+
+ if ((err=mp_read_unsigned_bin(&y, pk, pk_size)) != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(err);
+ goto fail;
+ }
+
+ if ((err=mp_exptmod(&y, &key->x, &key->p, &gxy))!= CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(err);
+ goto fail;
+ }
+
+ err = mp_unsigned_bin_size(&gxy);
+ if (err > NCR_CIPHER_MAX_KEY_LEN) {
+ err();
+ ret = -EOVERFLOW;
+ goto fail;
+ }
+ newkey->key.secret.size = err;
+
+ err = mp_to_unsigned_bin(&gxy, newkey->key.secret.data);
+ if (err != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(err);
+ goto fail;
+ }
+
+ newkey->type = NCR_KEY_TYPE_SECRET;
+
+ ret = 0;
+fail:
+ mp_clear_multi(&y, &gxy, NULL);
+
+ return ret;
+}
diff --git a/crypto/userspace/ncr-pk.c b/crypto/userspace/ncr-pk.c
new file mode 100644
index 0000000..2ae3f27
--- /dev/null
+++ b/crypto/userspace/ncr-pk.c
@@ -0,0 +1,659 @@
+/*
+ * New driver for /dev/crypto device (aka CryptoDev)
+
+ * Copyright (c) 2010 Katholieke Universiteit Leuven
+ *
+ * Author: Nikos Mavrogiannopoulos <nmav@gnutls.org>
+ *
+ * This file is part of linux cryptodev.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/ioctl.h>
+#include <linux/mm.h>
+#include <linux/ncr.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/uaccess.h>
+#include <linux/scatterlist.h>
+#include <net/netlink.h>
+#include "ncr-int.h"
+#include <tomcrypt.h>
+
+int _ncr_tomerr(int err)
+{
+ switch (err) {
+ case CRYPT_BUFFER_OVERFLOW:
+ return -ERANGE;
+ case CRYPT_MEM:
+ return -ENOMEM;
+ default:
+ return -EINVAL;
+ }
+}
+
+void ncr_pk_clear(struct key_item_st* key)
+{
+ if (key->algorithm == NULL)
+ return;
+ switch(key->algorithm->algo) {
+ case NCR_ALG_RSA:
+ rsa_free(&key->key.pk.rsa);
+ break;
+ case NCR_ALG_DSA:
+ dsa_free(&key->key.pk.dsa);
+ break;
+ case NCR_ALG_DH:
+ dh_free(&key->key.pk.dh);
+ break;
+ default:
+ return;
+ }
+}
+
+static int ncr_pk_make_public_and_id( struct key_item_st * private, struct key_item_st * public)
+{
+ uint8_t * tmp;
+ unsigned long max_size;
+ int ret, cret;
+ unsigned long key_id_size;
+
+ max_size = KEY_DATA_MAX_SIZE;
+ tmp = kmalloc(max_size, GFP_KERNEL);
+ if (tmp == NULL) {
+ err();
+ return -ENOMEM;
+ }
+
+ switch(private->algorithm->algo) {
+ case NCR_ALG_RSA:
+ cret = rsa_export(tmp, &max_size, PK_PUBLIC, &private->key.pk.rsa);
+ if (cret != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(cret);
+ goto fail;
+ }
+
+ cret = rsa_import(tmp, max_size, &public->key.pk.rsa);
+ if (cret != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(cret);
+ goto fail;
+ }
+ break;
+ case NCR_ALG_DSA:
+ cret = dsa_export(tmp, &max_size, PK_PUBLIC, &private->key.pk.dsa);
+ if (cret != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(cret);
+ goto fail;
+ }
+
+ cret = dsa_import(tmp, max_size, &public->key.pk.dsa);
+ if (cret != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(cret);
+ goto fail;
+ }
+ break;
+ case NCR_ALG_DH:
+ ret = dh_generate_public(&public->key.pk.dh, &private->key.pk.dh);
+ if (ret < 0) {
+ err();
+ goto fail;
+ }
+ break;
+ default:
+ err();
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ key_id_size = MAX_KEY_ID_SIZE;
+ cret = hash_memory(_ncr_algo_to_properties("sha1"), tmp, max_size,
+ private->key_id, &key_id_size);
+ if (cret != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(cret);
+ goto fail;
+ }
+ private->key_id_size = public->key_id_size = key_id_size;
+ memcpy(public->key_id, private->key_id, key_id_size);
+
+ ret = 0;
+fail:
+ kfree(tmp);
+
+ return ret;
+}
+
+int ncr_pk_pack( const struct key_item_st * key, uint8_t * packed, uint32_t * packed_size)
+{
+ unsigned long max_size = *packed_size;
+ int cret, ret;
+
+ if (packed == NULL || packed_size == NULL) {
+ err();
+ return -EINVAL;
+ }
+
+ switch(key->algorithm->algo) {
+ case NCR_ALG_RSA:
+ cret = rsa_export(packed, &max_size, key->key.pk.rsa.type, (void*)&key->key.pk.rsa);
+ if (cret != CRYPT_OK) {
+ *packed_size = max_size;
+ err();
+ return _ncr_tomerr(cret);
+ }
+ break;
+ case NCR_ALG_DSA:
+ cret = dsa_export(packed, &max_size, key->key.pk.dsa.type, (void*)&key->key.pk.dsa);
+ if (cret != CRYPT_OK) {
+ *packed_size = max_size;
+ err();
+ return _ncr_tomerr(cret);
+ }
+ break;
+ case NCR_ALG_DH:
+ ret = dh_export(packed, &max_size, key->key.pk.dsa.type, (void*)&key->key.pk.dsa);
+ if (ret < 0) {
+ err();
+ return ret;
+ }
+ break;
+ default:
+ err();
+ return -EINVAL;
+ }
+
+ *packed_size = max_size;
+
+ return 0;
+}
+
+int ncr_pk_unpack( struct key_item_st * key, const void * packed, size_t packed_size)
+{
+ int cret, ret;
+
+ if (key == NULL || packed == NULL) {
+ err();
+ return -EINVAL;
+ }
+
+ switch(key->algorithm->algo) {
+ case NCR_ALG_RSA:
+ cret = rsa_import(packed, packed_size, (void*)&key->key.pk.rsa);
+ if (cret != CRYPT_OK) {
+ err();
+ return _ncr_tomerr(cret);
+ }
+ break;
+ case NCR_ALG_DSA:
+ cret = dsa_import(packed, packed_size, (void*)&key->key.pk.dsa);
+ if (cret != CRYPT_OK) {
+ err();
+ return _ncr_tomerr(cret);
+ }
+ break;
+ case NCR_ALG_DH:
+ ret = dh_import(packed, packed_size, (void*)&key->key.pk.dh);
+ if (ret < 0) {
+ err();
+ return ret;
+ }
+ break;
+ default:
+ err();
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int binary_to_ulong(unsigned long *dest, const struct nlattr *nla)
+{
+ unsigned long value;
+ const uint8_t *start, *end, *p;
+
+ value = 0;
+ start = nla_data(nla);
+ end = start + nla_len(nla);
+ for (p = start; p < end; p++) {
+ if (value > (ULONG_MAX - *p) / 256)
+ return -EOVERFLOW;
+ value = value * 256 + *p;
+ }
+ *dest = value;
+ return 0;
+}
+
+int ncr_pk_generate(const struct algo_properties_st *algo, struct nlattr *tb[],
+ struct key_item_st* private, struct key_item_st* public)
+{
+ const struct nlattr *nla;
+ unsigned long e;
+ int cret, ret;
+
+ private->algorithm = public->algorithm = algo;
+
+ ret = 0;
+ switch(algo->algo) {
+ case NCR_ALG_RSA:
+ nla = tb[NCR_ATTR_RSA_E];
+ if (nla != NULL) {
+ ret = binary_to_ulong(&e, nla);
+ if (ret != 0)
+ break;
+ } else
+ e = 65537;
+
+ nla = tb[NCR_ATTR_RSA_MODULUS_BITS];
+ if (nla == NULL) {
+ ret = -EINVAL;
+ break;
+ }
+ cret = rsa_make_key(nla_get_u32(nla) / 8, e,
+ &private->key.pk.rsa);
+ if (cret != CRYPT_OK) {
+ err();
+ return _ncr_tomerr(cret);
+ }
+ break;
+ case NCR_ALG_DSA: {
+ u32 q_bits, p_bits;
+
+ nla = tb[NCR_ATTR_DSA_Q_BITS];
+ if (nla != NULL)
+ q_bits = nla_get_u32(nla);
+ else
+ q_bits = 160;
+ nla = tb[NCR_ATTR_DSA_P_BITS];
+ if (nla != NULL)
+ p_bits = nla_get_u32(nla);
+ else
+ p_bits = 1024;
+ cret = dsa_make_key(q_bits / 8, p_bits / 8,
+ &private->key.pk.dsa);
+ if (cret != CRYPT_OK) {
+ err();
+ return _ncr_tomerr(cret);
+ }
+ break;
+ }
+ case NCR_ALG_DH: {
+ const struct nlattr *p, *g;
+
+ p = tb[NCR_ATTR_DH_PRIME];
+ g = tb[NCR_ATTR_DH_BASE];
+ if (p == NULL || g == NULL) {
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ ret = dh_import_params(&private->key.pk.dh, nla_data(p),
+ nla_len(p), nla_data(g),
+ nla_len(g));
+ if (ret < 0) {
+ err();
+ goto fail;
+ }
+
+ ret = dh_generate_key(&private->key.pk.dh);
+ if (ret < 0) {
+ err();
+ goto fail;
+ }
+ break;
+ }
+ default:
+ err();
+ return -EINVAL;
+ }
+
+fail:
+ if (ret < 0) {
+ err();
+ return ret;
+ }
+
+ ret = ncr_pk_make_public_and_id(private, public);
+ if (ret < 0) {
+ err();
+ return ret;
+ }
+
+ return 0;
+}
+
+/* Encryption/Decryption
+ */
+
+void ncr_pk_cipher_deinit(struct ncr_pk_ctx* ctx)
+{
+ if (ctx->init) {
+ ctx->init = 0;
+ ctx->key = NULL;
+ }
+}
+
+int ncr_pk_cipher_init(const struct algo_properties_st *algo,
+ struct ncr_pk_ctx* ctx, struct nlattr *tb[],
+ struct key_item_st *key,
+ const struct algo_properties_st *sign_hash)
+{
+ const struct nlattr *nla;
+
+ memset(ctx, 0, sizeof(*ctx));
+
+ if (key->algorithm != algo) {
+ err();
+ return -EINVAL;
+ }
+
+ ctx->algorithm = algo;
+ ctx->key = key;
+ ctx->sign_hash = sign_hash;
+ ctx->salt_len = 0;
+
+ switch(algo->algo) {
+ case NCR_ALG_RSA:
+ nla = tb[NCR_ATTR_RSA_ENCODING_METHOD];
+ if (nla == NULL) {
+ err();
+ return -EINVAL;
+ }
+ switch (nla_get_u32(nla)) {
+ case RSA_PKCS1_V1_5:
+ ctx->type = LTC_LTC_PKCS_1_V1_5;
+ break;
+ case RSA_PKCS1_OAEP:
+ ctx->type = LTC_LTC_PKCS_1_OAEP;
+ nla = tb[NCR_ATTR_RSA_OAEP_HASH_ALGORITHM];
+ ctx->oaep_hash = _ncr_nla_to_properties(nla);
+ if (ctx->oaep_hash == NULL) {
+ err();
+ return -EINVAL;
+ }
+ break;
+ case RSA_PKCS1_PSS:
+ ctx->type = LTC_LTC_PKCS_1_PSS;
+ nla = tb[NCR_ATTR_RSA_PSS_SALT_LENGTH];
+ if (nla != NULL)
+ ctx->salt_len = nla_get_u32(nla);
+ break;
+ default:
+ err();
+ return -EINVAL;
+ }
+ break;
+ case NCR_ALG_DSA:
+ break;
+ default:
+ err();
+ return -EINVAL;
+ }
+
+ ctx->init = 1;
+
+ return 0;
+}
+
+int ncr_pk_cipher_encrypt(const struct ncr_pk_ctx* ctx,
+ const struct scatterlist* isg, unsigned int isg_cnt, size_t isg_size,
+ struct scatterlist *osg, unsigned int osg_cnt, size_t* osg_size)
+{
+int cret, ret;
+unsigned long osize = *osg_size;
+uint8_t* tmp;
+void * input, *output;
+
+ tmp = kmalloc(isg_size + *osg_size, GFP_KERNEL);
+ if (tmp == NULL) {
+ err();
+ return -ENOMEM;
+ }
+
+ ret = sg_copy_to_buffer((struct scatterlist*)isg, isg_cnt, tmp, isg_size);
+ if (ret != isg_size) {
+ err();
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ input = tmp;
+ output = &tmp[isg_size];
+
+
+ switch(ctx->algorithm->algo) {
+ case NCR_ALG_RSA:
+ cret = rsa_encrypt_key_ex( input, isg_size, output, &osize,
+ NULL, 0, ctx->oaep_hash, ctx->type, &ctx->key->key.pk.rsa);
+
+ if (cret != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(cret);
+ goto fail;
+ }
+ *osg_size = osize;
+
+ break;
+ case NCR_ALG_DSA:
+ ret = -EINVAL;
+ goto fail;
+ default:
+ err();
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ ret = sg_copy_from_buffer(osg, osg_cnt, output, *osg_size);
+ if (ret != *osg_size) {
+ err();
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ ret = 0;
+
+fail:
+ kfree(tmp);
+ return ret;
+}
+
+int ncr_pk_cipher_decrypt(const struct ncr_pk_ctx* ctx,
+ const struct scatterlist* isg, unsigned int isg_cnt, size_t isg_size,
+ struct scatterlist *osg, unsigned int osg_cnt, size_t* osg_size)
+{
+int cret, ret;
+int stat;
+unsigned long osize = *osg_size;
+uint8_t* tmp;
+void * input, *output;
+
+ tmp = kmalloc(isg_size + *osg_size, GFP_KERNEL);
+ if (tmp == NULL) {
+ err();
+ return -ENOMEM;
+ }
+
+ input = tmp;
+ output = &tmp[isg_size];
+
+ ret = sg_copy_to_buffer((struct scatterlist*)isg, isg_cnt, input, isg_size);
+ if (ret != isg_size) {
+ err();
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ switch(ctx->algorithm->algo) {
+ case NCR_ALG_RSA:
+ cret = rsa_decrypt_key_ex( input, isg_size, output, &osize,
+ NULL, 0, ctx->oaep_hash, ctx->type, &stat, &ctx->key->key.pk.rsa);
+
+ if (cret != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(cret);
+ goto fail;
+ }
+
+ if (stat==0) {
+ err();
+ ret = -EINVAL;
+ goto fail;
+ }
+ *osg_size = osize;
+ break;
+ case NCR_ALG_DSA:
+ ret = -EINVAL;
+ goto fail;
+ default:
+ err();
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ ret = sg_copy_from_buffer(osg, osg_cnt, output, *osg_size);
+ if (ret != *osg_size) {
+ err();
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ ret = 0;
+fail:
+ kfree(tmp);
+
+ return ret;
+}
+
+int ncr_pk_cipher_sign(const struct ncr_pk_ctx *ctx, const void *hash,
+ size_t hash_size, void *sig, size_t *sig_size)
+{
+ int cret;
+ unsigned long osize = *sig_size;
+
+ switch(ctx->algorithm->algo) {
+ case NCR_ALG_RSA:
+ if (ctx->sign_hash == NULL) {
+ err();
+ return -EINVAL;
+ }
+ cret = rsa_sign_hash_ex(hash, hash_size, sig, &osize,
+ ctx->type, ctx->sign_hash, ctx->salt_len, &ctx->key->key.pk.rsa);
+ if (cret != CRYPT_OK) {
+ err();
+ return _ncr_tomerr(cret);
+ }
+ *sig_size = osize;
+ break;
+ case NCR_ALG_DSA:
+ cret = dsa_sign_hash(hash, hash_size, sig, &osize,
+ &ctx->key->key.pk.dsa);
+
+ if (cret != CRYPT_OK) {
+ err();
+ return _ncr_tomerr(cret);
+ }
+ *sig_size = osize;
+ break;
+ default:
+ err();
+ return -EINVAL;
+ }
+ return 0;
+}
+
+int ncr_pk_cipher_verify(const struct ncr_pk_ctx* ctx, const void *sig,
+ size_t sig_size, const void *hash, size_t hash_size)
+{
+ int cret, ret, stat;
+
+ switch(ctx->algorithm->algo) {
+ case NCR_ALG_RSA:
+ if (ctx->sign_hash == NULL) {
+ err();
+ return -EINVAL;
+ }
+ cret = rsa_verify_hash_ex(sig, sig_size, hash,
+ hash_size, ctx->type,
+ ctx->sign_hash, ctx->salt_len,
+ &stat, &ctx->key->key.pk.rsa);
+ if (cret != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(cret);
+ goto fail;
+ }
+
+ ret = (stat == 1);
+ break;
+ case NCR_ALG_DSA:
+ cret = dsa_verify_hash(sig, sig_size, hash, hash_size,
+ &stat, &ctx->key->key.pk.dsa);
+ if (cret != CRYPT_OK) {
+ err();
+ ret = _ncr_tomerr(cret);
+ goto fail;
+ }
+
+ ret = (stat == 1);
+ break;
+ default:
+ err();
+ ret = -EINVAL;
+ goto fail;
+ }
+
+fail:
+ return ret;
+}
+
+int ncr_pk_derive(struct key_item_st* newkey, struct key_item_st* oldkey,
+ struct nlattr *tb[])
+{
+const struct nlattr *nla;
+int ret;
+
+ nla = tb[NCR_ATTR_DERIVATION_ALGORITHM];
+ if (nla == NULL) {
+ err();
+ return -EINVAL;
+ }
+ if (nla_strcmp(nla, NCR_DERIVE_DH) == 0) {
+ if (oldkey->type != NCR_KEY_TYPE_PRIVATE &&
+ oldkey->algorithm->algo != NCR_ALG_DH) {
+ err();
+ return -EINVAL;
+ }
+
+ nla = tb[NCR_ATTR_DH_PUBLIC];
+ if (nla == NULL) {
+ err();
+ return -EINVAL;
+ }
+ ret = dh_derive_gxy(newkey, &oldkey->key.pk.dh, nla_data(nla),
+ nla_len(nla));
+ if (ret < 0) {
+ err();
+ return ret;
+ }
+ } else {
+ err();
+ return -EINVAL;
+ }
+
+ return 0;
+}
--
1.7.2.1


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