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Subject[PATCH RFC v2 1/2] crypto: add PKE API
From
Date
Add Public Key Encryption API.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
---
crypto/Kconfig | 6 +
crypto/Makefile | 1
crypto/crypto_user.c | 24 +++
crypto/pkey.c | 125 ++++++++++++++
include/crypto/pkey.h | 390 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/crypto.h | 1
include/linux/cryptouser.h | 7 +
7 files changed, 554 insertions(+)
create mode 100644 crypto/pkey.c
create mode 100644 include/crypto/pkey.h

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 8aaf298..daa9c07 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -87,6 +87,12 @@ config CRYPTO_PCOMP2
tristate
select CRYPTO_ALGAPI2

+config CRYPTO_PKEY
+ tristate "Public Key Algorithms API"
+ select CRYPTO_ALGAPI
+ help
+ Crypto API interface for public key algorithms.
+
config CRYPTO_MANAGER
tristate "Cryptographic algorithm manager"
select CRYPTO_MANAGER2
diff --git a/crypto/Makefile b/crypto/Makefile
index 97b7d3a..1930f85 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -27,6 +27,7 @@ crypto_hash-y += shash.o
obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o

obj-$(CONFIG_CRYPTO_PCOMP2) += pcompress.o
+obj-$(CONFIG_CRYPTO_PKEY) += pkey.o

cryptomgr-y := algboss.o testmgr.o

diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 41dfe76..ccc7f1d 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -27,6 +27,7 @@
#include <net/net_namespace.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
+#include <crypto/pkey.h>

#include "internal.h"

@@ -110,6 +111,23 @@ nla_put_failure:
return -EMSGSIZE;
}

+static int crypto_report_pkey(struct sk_buff *skb, struct crypto_alg *alg)
+{
+ struct crypto_report_pkey rpkey;
+
+ strncpy(rpkey.type, "pke", sizeof(rpkey.type));
+ strncpy(rpkey.subtype, alg->cra_name, sizeof(rpkey.subtype));
+ rpkey.capabilities = __crypto_pkey_alg(alg)->capabilities;
+
+ if (nla_put(skb, CRYPTOCFGA_REPORT_PKEY,
+ sizeof(struct crypto_report_pkey), &rpkey))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
static int crypto_report_one(struct crypto_alg *alg,
struct crypto_user_alg *ualg, struct sk_buff *skb)
{
@@ -154,6 +172,12 @@ static int crypto_report_one(struct crypto_alg *alg,
goto nla_put_failure;

break;
+
+ case CRYPTO_ALG_TYPE_PKEY:
+ if (crypto_report_pkey(skb, alg))
+ goto nla_put_failure;
+
+ break;
}

out:
diff --git a/crypto/pkey.c b/crypto/pkey.c
new file mode 100644
index 0000000..ab8c0e9
--- /dev/null
+++ b/crypto/pkey.c
@@ -0,0 +1,125 @@
+/*
+ * Public Key Encryption
+ *
+ * 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 License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/crypto.h>
+#include <crypto/algapi.h>
+#include <linux/cryptouser.h>
+#include <net/netlink.h>
+#include <crypto/pkey.h>
+#include "internal.h"
+
+#ifdef CONFIG_NET
+static int crypto_pkey_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+ struct crypto_report_pkey rep_pkey;
+
+ strncpy(rep_pkey.type, "pkey", sizeof(rep_pkey.type));
+ strncpy(rep_pkey.subtype, alg->cra_name, sizeof(rep_pkey.subtype));
+ rep_pkey.capabilities = __crypto_pkey_alg(alg)->capabilities;
+
+ if (nla_put(skb, CRYPTOCFGA_REPORT_PKEY,
+ sizeof(struct crypto_report_pkey), &rep_pkey))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+#else
+static int crypto_pkey_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+ return -ENOSYS;
+}
+#endif
+
+static void crypto_pkey_show(struct seq_file *m, struct crypto_alg *alg)
+ __attribute__ ((unused));
+static void crypto_pkey_show(struct seq_file *m, struct crypto_alg *alg)
+{
+ int cap = __crypto_pkey_alg(alg)->capabilities;
+
+ seq_puts(m, "type : pke\n");
+ seq_printf(m, "subtype : %s\n", alg->cra_name);
+ seq_printf(m, "can encrypt : %s\n",
+ cap & PKEY_CAN_ENCRYPT ? "yes" : "no");
+ seq_printf(m, "can decrypt : %s\n",
+ cap & PKEY_CAN_DECRYPT ? "yes" : "no");
+ seq_printf(m, "can sign : %s\n",
+ cap & PKEY_CAN_SIGN ? "yes" : "no");
+ seq_printf(m, "can verify : %s\n",
+ cap & PKEY_CAN_VERIFY ? "yes" : "no");
+}
+
+static int crypto_pkey_init(struct crypto_tfm *tfm)
+{
+ return 0;
+}
+
+static const struct crypto_type crypto_pkey_type = {
+ .extsize = crypto_alg_extsize,
+ .init_tfm = crypto_pkey_init,
+#ifdef CONFIG_PROC_FS
+ .show = crypto_pkey_show,
+#endif
+ .report = crypto_pkey_report,
+ .maskclear = ~CRYPTO_ALG_TYPE_MASK,
+ .maskset = CRYPTO_ALG_TYPE_MASK,
+ .type = CRYPTO_ALG_TYPE_PKEY,
+ .tfmsize = offsetof(struct crypto_pkey, base),
+};
+
+struct crypto_pkey *crypto_alloc_pkey(const char *alg_name, u32 type, u32 mask)
+{
+ return crypto_alloc_tfm(alg_name, &crypto_pkey_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_pkey);
+
+int crypto_register_pkey(struct pkey_alg *alg)
+{
+ struct crypto_alg *base = &alg->base;
+
+ if (alg->n_pub_mpi > 5 || alg->n_sec_mpi > 5 || alg->n_sig_mpi > 2)
+ return -EINVAL;
+
+ if ((alg->capabilities & PKEY_CAN_ENCRYPT) && !alg->encrypt)
+ return -EINVAL;
+
+ if ((alg->capabilities & PKEY_CAN_DECRYPT) && !alg->decrypt)
+ return -EINVAL;
+
+ if ((alg->capabilities & PKEY_CAN_SIGN) && !alg->sign)
+ return -EINVAL;
+
+ if ((alg->capabilities & PKEY_CAN_VERIFY) && !alg->verify)
+ return -EINVAL;
+
+ base->cra_type = &crypto_pkey_type;
+ base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+ base->cra_flags |= CRYPTO_ALG_TYPE_PKEY;
+
+ return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_pkey);
+
+void crypto_unregister_pkey(struct pkey_alg *alg)
+{
+ crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_pkey);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Generic public key type");
diff --git a/include/crypto/pkey.h b/include/crypto/pkey.h
new file mode 100644
index 0000000..abcdb11
--- /dev/null
+++ b/include/crypto/pkey.h
@@ -0,0 +1,390 @@
+/*
+ * Public Key Encryption
+ *
+ * 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 License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#ifndef _CRYPTO_PKEY_H
+#define _CRYPTO_PKEY_H
+#include <linux/crypto.h>
+
+struct public_key;
+struct public_key_signature;
+
+/**
+ * struct pkey_request - public key request
+ *
+ * @base: Common attributes for async crypto requests
+ * @pkey: Public key data for the subtype of the asymmetric key.
+ * It may include private part of the key as well as
+ * the public part.
+ * @signature: Public key signature data.
+ * @__ctx: Start of private context data.
+ */
+struct pkey_request {
+ struct crypto_async_request base;
+ const struct public_key *pkey;
+ const struct public_key_signature *signature;
+ void *__ctx[] CRYPTO_MINALIGN_ATTR;
+};
+
+/**
+ * struct pkey_alg - generic public key algorithm
+ *
+ * @sign: Function performs a sign operation as defined by public key
+ * algorithm. PKEY_CAN_SIGN bit in capabilities mask denotes
+ * if it is provided by algorithm.
+ * @verify: Function performs a sign operation as defined by public key
+ * algorithm. PKEY_CAN_VERIFY bit in capabilities mask denotes
+ * if it is provided by algorithm.
+ * @encrypt: Function performs an encrytp operation as defined by public key
+ * algorithm. PKEY_CAN_ENCRYPT bit in capabilities maks denotes
+ * if it is provided by algorithm.
+ * @decrypt: Function performs a decrypt operation as defined by public key
+ * algorithm. PKEY_CAN_DECRYPT bit in capabilities maks denotes
+ * if it is provided by algorithm.
+ * @n_pub_mpi: Minimun number of MPIs (Multi Precision Integers) in public key
+ * parameter in the pkey request as expected by the algorithm.
+ * @n_sec_mpi: Minimun number of MPIs (Multi Precision Integers) in secret key
+ * parameter in the pkey request as expected by the algorithm.
+ * @n_sig_mpi: Minimun number of MPIs (Multi Precision Integers) in signature
+ * parameter in the pkey request as expected by the algorithm.
+ * @capabilities:
+ * Specifies what operations are provided by the algorithm
+ * implementation.
+ * @reqsize: Request context size required by algorithm implementation.
+ * @base: Common crypto API algorithm data structure.
+ */
+struct pkey_alg {
+ int (*sign)(struct pkey_request *pkeyreq);
+ int (*verify)(struct pkey_request *pkeyreq);
+ int (*encrypt)(struct pkey_request *pkeyreq);
+ int (*decrypt)(struct pkey_request *pkeyreq);
+
+ u8 n_pub_mpi;
+ u8 n_sec_mpi;
+ u8 n_sig_mpi;
+#define PKEY_CAN_ENCRYPT 0x01
+#define PKEY_CAN_DECRYPT 0x02
+#define PKEY_CAN_SIGN 0x04
+#define PKEY_CAN_VERIFY 0x08
+ u8 capabilities;
+ unsigned int reqsize;
+ struct crypto_alg base;
+};
+
+/**
+ * struct crypto_pkey - user-instantiated objects which encapsulate algorithms
+ * and core processing logic.
+ *
+ * @base: Common crypto API algorithm data structure.
+ * @__ctx: Start of private context data
+ */
+struct crypto_pkey {
+ struct crypto_tfm base;
+ void *__ctx[] CRYPTO_MINALIGN_ATTR;
+};
+
+/**
+ * DOC: Generic Public Key API
+ *
+ * The Public Key API is used with the algorithms of type
+ * CRYPTO_ALG_TYPE_PKEY (listed as type "pkey" in /proc/crypto)
+ */
+
+/**
+ * crypto_alloc_pkey() -- allocate PKEY tfm handle
+ * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
+ * public key algorithm e.g. "rsa"
+ * @type: specifies the type of the algorithm
+ * @mask: specifies the mask for the algorithm
+ *
+ * Allocate a handle for public key algorithm. The returned struct
+ * crypto_pkey is the handle that is required for any subsequent
+ * API invocation for the public key operations.
+ *
+ * Return: allocated handle in case of success; IS_ERR() is true in case
+ * of an error, PTR_ERR() returns the error code.
+ */
+struct crypto_pkey *crypto_alloc_pkey(const char *alg_name, u32 type, u32 mask);
+
+/*
+ * Transform internal helpers.
+ */
+static inline struct pkey_alg *__crypto_pkey_alg(struct crypto_alg *alg)
+{
+ return container_of(alg, struct pkey_alg, base);
+}
+
+static inline struct crypto_pkey *__crypto_pkey_tfm(struct crypto_tfm *tfm)
+{
+ return container_of(tfm, struct crypto_pkey, base);
+}
+
+static inline struct crypto_tfm *crypto_pkey_tfm(struct crypto_pkey *tfm)
+{
+ return &tfm->base;
+}
+
+static inline struct pkey_alg *crypto_pkey_alg(struct crypto_pkey *tfm)
+{
+ return __crypto_pkey_alg(crypto_pkey_tfm(tfm)->__crt_alg);
+}
+
+/**
+ * crypto_free_pkey() -- free PKEY tfm handle
+ *
+ * @tfm: PKEY tfm handle allocated with crypto_alloc_pkey()
+ */
+static inline void crypto_free_pkey(struct crypto_pkey *tfm)
+{
+ crypto_destroy_tfm(tfm, crypto_pkey_tfm(tfm));
+}
+
+static inline unsigned int crypto_pkey_reqsize(struct crypto_pkey *tfm)
+{
+ return crypto_pkey_alg(tfm)->reqsize;
+}
+
+static inline void pkey_request_set_tfm(struct pkey_request *req,
+ struct crypto_pkey *tfm)
+{
+ req->base.tfm = crypto_pkey_tfm(tfm);
+}
+
+/**
+ * pkey_request_alloc() -- allocates public key request
+ *
+ * @tfm: PKEY tfm handle allocated with crypto_alloc_pkey()
+ * @gfp: allocation flags
+ *
+ * Return: allocated handle in case of success or NULL in case of an error.
+ */
+static inline struct pkey_request *pkey_request_alloc(struct crypto_pkey *tfm,
+ gfp_t gfp)
+{
+ struct pkey_request *req;
+
+ req = kmalloc(sizeof(*req) + crypto_pkey_reqsize(tfm), gfp);
+ if (likely(req))
+ pkey_request_set_tfm(req, tfm);
+
+ return req;
+}
+
+static inline void *pkey_request_ctx(struct pkey_request *req)
+{
+ return req->__ctx;
+}
+
+/**
+ * pkey_request_free() -- zeroize and free public key request
+ *
+ * @req: request to free
+ */
+static inline void pkey_request_free(struct pkey_request *req)
+{
+ kzfree(req);
+}
+
+/**
+ * pkey_request_set_callback() -- Sets an asynchronous callback.
+ *
+ * Callback will be called when an asynchronous operation on a given
+ * request is finished.
+ *
+ * @req: request that the callback will be set for.
+ * @flgs: specify for instance if the operation may backlog.
+ * @cmlp: callback which will be called.
+ * @data: private data used by the caller.
+ */
+static inline void pkey_request_set_callback(struct pkey_request *req, u32 flgs,
+ crypto_completion_t cmpl,
+ void *data)
+{
+ req->base.complete = cmpl;
+ req->base.data = data;
+ req->base.flags = flgs;
+}
+
+static inline void pkey_request_complete(struct pkey_request *req, int err)
+{
+ req->base.complete(&req->base, err);
+}
+
+/**
+ * pkey_request_set_crypt() -- Sets reqest parameters.
+ *
+ * Sets parameters required by crypto operation.
+ *
+ * @req: public key.
+ * @sig: public key signature.
+ */
+static inline void pkey_request_set_crypt(struct pkey_request *req,
+ const struct public_key *pkey,
+ const struct public_key_signature *sg)
+{
+ req->pkey = pkey;
+ req->signature = sg;
+}
+
+/**
+ * pkey_num_sig_mpi() -- Returns number of MPIs in signature
+ *
+ * Function returns number of MPIs (Multi Precision Integers) in signature
+ * parameter as expected by the algorithm.
+ *
+ * @tfm: tfm handle.
+ *
+ * Return: number of MPIs in signature.
+ */
+static inline u8 pkey_num_sig_mpi(struct crypto_pkey *tfm)
+{
+ return crypto_pkey_alg(tfm)->n_sig_mpi;
+}
+
+/**
+ * pkey_num_pub_mpi() -- Returns number of MPIs in public key
+ *
+ * Function returns number of MPIs (Multi Precision Integers) in public key
+ * parameter as expected by the algorithm.
+ *
+ * @tfm: tfm handle.
+ *
+ * Return: number of MPIs in public key.
+ */
+static inline u8 pkey_num_pub_mpi(struct crypto_pkey *tfm)
+{
+ return crypto_pkey_alg(tfm)->n_pub_mpi;
+}
+
+/**
+ * pkey_num_sec_mpi() -- Returns number of MPIs in secret key
+ *
+ * Function returns number of MPIs (Multi Precision Integers) in secret key
+ * parameter as expected by the algorithm.
+ *
+ * @tfm: tfm handle.
+ *
+ * Return: number of MPIs in secret key.
+ */
+static inline u8 pkey_num_sec_mpi(struct crypto_pkey *tfm)
+{
+ return crypto_pkey_alg(tfm)->n_sec_mpi;
+}
+
+/**
+ * pkey_capabilities() -- Returns cababilities
+ *
+ * Function returns bitmask of capabilities denoting what public key operations
+ * are supported by the algorithm.
+ *
+ * @tfm: tfm handle.
+ *
+ * Return: capabilities mask.
+ */
+static inline u8 pkey_capabilities(struct crypto_pkey *tfm)
+{
+ return crypto_pkey_alg(tfm)->capabilities;
+}
+
+/**
+ * pkey_capab() -- Returns algorithm name
+ *
+ * Function returns public key algorithm name e.g.g "rsa".
+ *
+ * @tfm: tfm handle.
+ *
+ * Return: public key algorithm name.
+ */
+static inline const char *pkey_alg_name(struct crypto_pkey *tfm)
+{
+ return crypto_pkey_tfm(tfm)->__crt_alg->cra_name;
+}
+
+/**
+ * crypto_pkey_encrypt() -- Invoke public key encrypt operation
+ *
+ * Function invokes the specific public key encrypt operation for a given
+ * public key algorithm.
+ *
+ * @tfm: tfm handle.
+ *
+ * Return: zero on success; error code in case of error.
+ */
+static inline int crypto_pkey_encrypt(struct pkey_request *req)
+{
+ return crypto_pkey_alg(__crypto_pkey_tfm(req->base.tfm))->encrypt(req);
+}
+
+/**
+ * crypto_pkey_encrypt() -- Invoke public key decrypt operation
+ *
+ * Function invokes the specific public key decrypt operation for a given
+ * public key algorithm.
+ *
+ * @tfm: tfm handle.
+ *
+ * Return: zero on success; error code in case of error.
+ */
+static inline int crypto_pkey_decrypt(struct pkey_request *req)
+{
+ return crypto_pkey_alg(__crypto_pkey_tfm(req->base.tfm))->decrypt(req);
+}
+
+/**
+ * crypto_pkey_encrypt() -- Invoke public key sign operation
+ *
+ * Function invokes the specific public key sign operation for a given
+ * public key algorithm.
+ *
+ * @tfm: tfm handle.
+ *
+ * Return: zero on success; error code in case of error.
+ */
+static inline int crypto_pkey_sign(struct pkey_request *req)
+{
+ return crypto_pkey_alg(__crypto_pkey_tfm(req->base.tfm))->sign(req);
+}
+
+/**
+ * crypto_pkey_encrypt() -- Invoke public key verify operation
+ *
+ * Function invokes the specific public key verify operation for a given
+ * public key algorithm.
+ *
+ * @tfm: tfm handle.
+ *
+ * Return: zero on success; error code in case of error.
+ */
+static inline int crypto_pkey_verify(struct pkey_request *req)
+{
+ return crypto_pkey_alg(__crypto_pkey_tfm(req->base.tfm))->verify(req);
+}
+
+/**
+ * crypto_register_pkey() -- Register public key algorithm
+ *
+ * Function registers an implementation of a public key verify algorithm.
+ *
+ * @alg: algorithm definition.
+ *
+ * Return: zero on success; error code in case of error.
+ */
+int crypto_register_pkey(struct pkey_alg *alg);
+
+/**
+ * crypto_unregister_pkey() -- Unregister public key algorithm
+ *
+ * Function unregisters an implementation of a public key verify algorithm.
+ *
+ * @alg: algorithm definition.
+ */
+void crypto_unregister_pkey(struct pkey_alg *alg);
+#endif
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index ee14140..61842c9 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -53,6 +53,7 @@
#define CRYPTO_ALG_TYPE_SHASH 0x00000009
#define CRYPTO_ALG_TYPE_AHASH 0x0000000a
#define CRYPTO_ALG_TYPE_RNG 0x0000000c
+#define CRYPTO_ALG_TYPE_PKEY 0x0000000d
#define CRYPTO_ALG_TYPE_PCOMPRESS 0x0000000f

#define CRYPTO_ALG_TYPE_HASH_MASK 0x0000000e
diff --git a/include/linux/cryptouser.h b/include/linux/cryptouser.h
index 4abf2ea..fdf9120 100644
--- a/include/linux/cryptouser.h
+++ b/include/linux/cryptouser.h
@@ -43,6 +43,7 @@ enum crypto_attr_type_t {
CRYPTOCFGA_REPORT_COMPRESS, /* struct crypto_report_comp */
CRYPTOCFGA_REPORT_RNG, /* struct crypto_report_rng */
CRYPTOCFGA_REPORT_CIPHER, /* struct crypto_report_cipher */
+ CRYPTOCFGA_REPORT_PKEY, /* struct crypto_report_pkey */
__CRYPTOCFGA_MAX

#define CRYPTOCFGA_MAX (__CRYPTOCFGA_MAX - 1)
@@ -101,5 +102,11 @@ struct crypto_report_rng {
unsigned int seedsize;
};

+struct crypto_report_pkey {
+ char type[CRYPTO_MAX_NAME];
+ char subtype[CRYPTO_MAX_NAME];
+ unsigned int capabilities;
+};
+
#define CRYPTO_REPORT_MAXSIZE (sizeof(struct crypto_user_alg) + \
sizeof(struct crypto_report_blkcipher))


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