crypto: akcipher - add PKE API

Add Public Key Encryption API.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>

Made CRYPTO_AKCIPHER invisible like other type config options.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

8 files changed, 555 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index f6fc054eb2d1..eb0aca45d430 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -91,6 +91,15 @@ config CRYPTO_PCOMP2
         tristate
         select CRYPTO_ALGAPI2
 
+config CRYPTO_AKCIPHER2
+        tristate
+        select CRYPTO_ALGAPI2
+
+config CRYPTO_AKCIPHER
+        tristate
+        select CRYPTO_AKCIPHER2
+        select CRYPTO_ALGAPI
+
 config CRYPTO_MANAGER
         tristate "Cryptographic algorithm manager"
         select CRYPTO_MANAGER2
diff --git a/crypto/Makefile b/crypto/Makefile
index c84203572477..1ed382df7db9 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -28,6 +28,7 @@ crypto_hash-y += shash.o
 obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
 
 obj-$(CONFIG_CRYPTO_PCOMP2) += pcompress.o
+obj-$(CONFIG_CRYPTO_AKCIPHER2) += akcipher.o
 
 cryptomgr-y := algboss.o testmgr.o
 
diff --git a/crypto/akcipher.c b/crypto/akcipher.c
new file mode 100644
index 000000000000..d7986414814e
--- /dev/null
+++ b/crypto/akcipher.c
@@ -0,0 +1,117 @@
+/*
+ * 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/akcipher.h>
+#include <crypto/public_key.h>
+#include "internal.h"
+
+#ifdef CONFIG_NET
+static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+        struct crypto_report_akcipher rakcipher;
+
+        strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
+
+        if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
+                    sizeof(struct crypto_report_akcipher), &rakcipher))
+                goto nla_put_failure;
+        return 0;
+
+nla_put_failure:
+        return -EMSGSIZE;
+}
+#else
+static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+        return -ENOSYS;
+}
+#endif
+
+static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
+        __attribute__ ((unused));
+
+static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
+{
+        seq_puts(m, "type         : akcipher\n");
+}
+
+static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm)
+{
+        struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
+        struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
+
+        alg->exit(akcipher);
+}
+
+static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm)
+{
+        struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
+        struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
+
+        if (alg->exit)
+                akcipher->base.exit = crypto_akcipher_exit_tfm;
+
+        if (alg->init)
+                return alg->init(akcipher);
+
+        return 0;
+}
+
+static const struct crypto_type crypto_akcipher_type = {
+        .extsize = crypto_alg_extsize,
+        .init_tfm = crypto_akcipher_init_tfm,
+#ifdef CONFIG_PROC_FS
+        .show = crypto_akcipher_show,
+#endif
+        .report = crypto_akcipher_report,
+        .maskclear = ~CRYPTO_ALG_TYPE_MASK,
+        .maskset = CRYPTO_ALG_TYPE_MASK,
+        .type = CRYPTO_ALG_TYPE_AKCIPHER,
+        .tfmsize = offsetof(struct crypto_akcipher, base),
+};
+
+struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
+                                              u32 mask)
+{
+        return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
+
+int crypto_register_akcipher(struct akcipher_alg *alg)
+{
+        struct crypto_alg *base = &alg->base;
+
+        base->cra_type = &crypto_akcipher_type;
+        base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+        base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
+        return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_akcipher);
+
+void crypto_unregister_akcipher(struct akcipher_alg *alg)
+{
+        crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Generic public key cihper type");
diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 41dfe762b7fb..11dbd5a81c72 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/akcipher.h>
 
 #include "internal.h"
 
@@ -110,6 +111,21 @@ nla_put_failure:
         return -EMSGSIZE;
 }
 
+static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg)
+{
+        struct crypto_report_akcipher rakcipher;
+
+        strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
+
+        if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
+                    sizeof(struct crypto_report_akcipher), &rakcipher))
+                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 +170,12 @@ static int crypto_report_one(struct crypto_alg *alg,
                         goto nla_put_failure;
 
                 break;
+
+        case CRYPTO_ALG_TYPE_AKCIPHER:
+                if (crypto_report_akcipher(skb, alg))
+                        goto nla_put_failure;
+
+                break;
         }
 
 out:
diff --git a/include/crypto/akcipher.h b/include/crypto/akcipher.h
new file mode 100644
index 000000000000..69d163e39101
--- /dev/null
+++ b/include/crypto/akcipher.h
@@ -0,0 +1,340 @@
+/*
+ * 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_AKCIPHER_H
+#define _CRYPTO_AKCIPHER_H
+#include <linux/crypto.h>
+
+/**
+ * struct akcipher_request - public key request
+ *
+ * @base:       Common attributes for async crypto requests
+ * @src:        Pointer to memory containing the input parameters
+ *              The format of the parameter(s) is expeted to be Octet String
+ * @dst:        Pointer to memory whare the result will be stored
+ * @src_len:    Size of the input parameter
+ * @dst_len:    Size of the output buffer. It needs to be at leaset
+ *              as big as the expected result depending on the operation
+ *              After operation it will be updated with the acctual size of the
+ *              result. In case of error, where the dst_len was insufficient,
+ *              it will be updated to the size required for the operation.
+ * @__ctx:      Start of private context data
+ */
+struct akcipher_request {
+        struct crypto_async_request base;
+        void *src;
+        void *dst;
+        unsigned int src_len;
+        unsigned int dst_len;
+        void *__ctx[] CRYPTO_MINALIGN_ATTR;
+};
+
+/**
+ * struct crypto_akcipher - user-instantiated objects which encapsulate
+ * algorithms and core processing logic
+ *
+ * @base:       Common crypto API algorithm data structure
+ */
+struct crypto_akcipher {
+        struct crypto_tfm base;
+};
+
+/**
+ * struct akcipher_alg - generic public key algorithm
+ *
+ * @sign:       Function performs a sign operation as defined by public key
+ *              algorithm. In case of error, where the dst_len was insufficient,
+ *              the req->dst_len will be updated to the size required for the
+ *              operation
+ * @verify:     Function performs a sign operation as defined by public key
+ *              algorithm. In case of error, where the dst_len was insufficient,
+ *              the req->dst_len will be updated to the size required for the
+ *              operation
+ * @encrypt:    Function performs an encrytp operation as defined by public key
+ *              algorithm. In case of error, where the dst_len was insufficient,
+ *              the req->dst_len will be updated to the size required for the
+ *              operation
+ * @decrypt:    Function performs a decrypt operation as defined by public key
+ *              algorithm. In case of error, where the dst_len was insufficient,
+ *              the req->dst_len will be updated to the size required for the
+ *              operation
+ * @setkey:     Function invokes the algorithm specific set key function, which
+ *              knows how to decode and interpret the BER encoded key
+ * @init:       Initialize the cryptographic transformation object.
+ *              This function is used to initialize the cryptographic
+ *              transformation object. This function is called only once at
+ *              the instantiation time, right after the transformation context
+ *              was allocated. In case the cryptographic hardware has some
+ *              special requirements which need to be handled by software, this
+ *              function shall check for the precise requirement of the
+ *              transformation and put any software fallbacks in place.
+ * @exit:       Deinitialize the cryptographic transformation object. This is a
+ *              counterpart to @init, used to remove various changes set in
+ *              @init.
+ *
+ * @reqsize:    Request context size required by algorithm implementation
+ * @base:       Common crypto API algorithm data structure
+ */
+struct akcipher_alg {
+        int (*sign)(struct akcipher_request *req);
+        int (*verify)(struct akcipher_request *req);
+        int (*encrypt)(struct akcipher_request *req);
+        int (*decrypt)(struct akcipher_request *req);
+        int (*setkey)(struct crypto_akcipher *tfm, const void *key,
+                      unsigned int keylen);
+        int (*init)(struct crypto_akcipher *tfm);
+        void (*exit)(struct crypto_akcipher *tfm);
+
+        unsigned int reqsize;
+        struct crypto_alg base;
+};
+
+/**
+ * DOC: Generic Public Key API
+ *
+ * The Public Key API is used with the algorithms of type
+ * CRYPTO_ALG_TYPE_AKCIPHER (listed as type "akcipher" in /proc/crypto)
+ */
+
+/**
+ * crypto_alloc_akcipher() -- allocate AKCIPHER 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_akcipher 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_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
+                                              u32 mask);
+
+static inline struct crypto_tfm *crypto_akcipher_tfm(
+        struct crypto_akcipher *tfm)
+{
+        return &tfm->base;
+}
+
+static inline struct akcipher_alg *__crypto_akcipher_alg(struct crypto_alg *alg)
+{
+        return container_of(alg, struct akcipher_alg, base);
+}
+
+static inline struct crypto_akcipher *__crypto_akcipher_tfm(
+        struct crypto_tfm *tfm)
+{
+        return container_of(tfm, struct crypto_akcipher, base);
+}
+
+static inline struct akcipher_alg *crypto_akcipher_alg(
+        struct crypto_akcipher *tfm)
+{
+        return __crypto_akcipher_alg(crypto_akcipher_tfm(tfm)->__crt_alg);
+}
+
+static inline unsigned int crypto_akcipher_reqsize(struct crypto_akcipher *tfm)
+{
+        return crypto_akcipher_alg(tfm)->reqsize;
+}
+
+static inline void akcipher_request_set_tfm(struct akcipher_request *req,
+                                            struct crypto_akcipher *tfm)
+{
+        req->base.tfm = crypto_akcipher_tfm(tfm);
+}
+
+static inline struct crypto_akcipher *crypto_akcipher_reqtfm(
+        struct akcipher_request *req)
+{
+        return __crypto_akcipher_tfm(req->base.tfm);
+}
+
+/**
+ * crypto_free_akcipher() -- free AKCIPHER tfm handle
+ *
+ * @tfm: AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
+ */
+static inline void crypto_free_akcipher(struct crypto_akcipher *tfm)
+{
+        crypto_destroy_tfm(tfm, crypto_akcipher_tfm(tfm));
+}
+
+/**
+ * akcipher_request_alloc() -- allocates public key request
+ *
+ * @tfm:        AKCIPHER tfm handle allocated with crypto_alloc_akcipher()
+ * @gfp:        allocation flags
+ *
+ * Return: allocated handle in case of success or NULL in case of an error.
+ */
+static inline struct akcipher_request *akcipher_request_alloc(
+        struct crypto_akcipher *tfm, gfp_t gfp)
+{
+        struct akcipher_request *req;
+
+        req = kmalloc(sizeof(*req) + crypto_akcipher_reqsize(tfm), gfp);
+        if (likely(req))
+                akcipher_request_set_tfm(req, tfm);
+
+        return req;
+}
+
+/**
+ * akcipher_request_free() -- zeroize and free public key request
+ *
+ * @req:        request to free
+ */
+static inline void akcipher_request_free(struct akcipher_request *req)
+{
+        kzfree(req);
+}
+
+/**
+ * akcipher_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 akcipher_request_set_callback(struct akcipher_request *req,
+                                                 u32 flgs,
+                                                 crypto_completion_t cmpl,
+                                                 void *data)
+{
+        req->base.complete = cmpl;
+        req->base.data = data;
+        req->base.flags = flgs;
+}
+
+/**
+ * akcipher_request_set_crypt() -- Sets reqest parameters
+ *
+ * Sets parameters required by crypto operation
+ *
+ * @req:        public key request
+ * @src:        ptr to input parameter
+ * @dst:        ptr of output parameter
+ * @src_len:    size of the input buffer
+ * @dst_len:    size of the output buffer. It will be updated by the
+ *              implementation to reflect the acctual size of the result
+ */
+static inline void akcipher_request_set_crypt(struct akcipher_request *req,
+                                              void *src, void *dst,
+                                              unsigned int src_len,
+                                              unsigned int dst_len)
+{
+        req->src = src;
+        req->dst = dst;
+        req->src_len = src_len;
+        req->dst_len = dst_len;
+}
+
+/**
+ * crypto_akcipher_encrypt() -- Invoke public key encrypt operation
+ *
+ * Function invokes the specific public key encrypt operation for a given
+ * public key algorithm
+ *
+ * @req:        asymmetric key request
+ *
+ * Return: zero on success; error code in case of error
+ */
+static inline int crypto_akcipher_encrypt(struct akcipher_request *req)
+{
+        struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+        struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
+
+        return alg->encrypt(req);
+}
+
+/**
+ * crypto_akcipher_decrypt() -- Invoke public key decrypt operation
+ *
+ * Function invokes the specific public key decrypt operation for a given
+ * public key algorithm
+ *
+ * @req:        asymmetric key request
+ *
+ * Return: zero on success; error code in case of error
+ */
+static inline int crypto_akcipher_decrypt(struct akcipher_request *req)
+{
+        struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+        struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
+
+        return alg->decrypt(req);
+}
+
+/**
+ * crypto_akcipher_sign() -- Invoke public key sign operation
+ *
+ * Function invokes the specific public key sign operation for a given
+ * public key algorithm
+ *
+ * @req:        asymmetric key request
+ *
+ * Return: zero on success; error code in case of error
+ */
+static inline int crypto_akcipher_sign(struct akcipher_request *req)
+{
+        struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+        struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
+
+        return alg->sign(req);
+}
+
+/**
+ * crypto_akcipher_verify() -- Invoke public key verify operation
+ *
+ * Function invokes the specific public key verify operation for a given
+ * public key algorithm
+ *
+ * @req:        asymmetric key request
+ *
+ * Return: zero on success; error code in case of error
+ */
+static inline int crypto_akcipher_verify(struct akcipher_request *req)
+{
+        struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+        struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
+
+        return alg->verify(req);
+}
+
+/**
+ * crypto_akcipher_setkey() -- Invoke public key setkey operation
+ *
+ * Function invokes the algorithm specific set key function, which knows
+ * how to decode and interpret the encoded key
+ *
+ * @tfm:        tfm handle
+ * @key:        BER encoded private or public key
+ * @keylen:     length of the key
+ *
+ * Return: zero on success; error code in case of error
+ */
+static inline int crypto_akcipher_setkey(struct crypto_akcipher *tfm, void *key,
+                                         unsigned int keylen)
+{
+        struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
+
+        return alg->setkey(tfm, key, keylen);
+}
+#endif
diff --git a/include/crypto/internal/akcipher.h b/include/crypto/internal/akcipher.h
new file mode 100644
index 000000000000..9a2bda15e454
--- /dev/null
+++ b/include/crypto/internal/akcipher.h
@@ -0,0 +1,60 @@
+/*
+ * 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_AKCIPHER_INT_H
+#define _CRYPTO_AKCIPHER_INT_H
+#include <crypto/akcipher.h>
+
+/*
+ * Transform internal helpers.
+ */
+static inline void *akcipher_request_ctx(struct akcipher_request *req)
+{
+        return req->__ctx;
+}
+
+static inline void *akcipher_tfm_ctx(struct crypto_akcipher *tfm)
+{
+        return tfm->base.__crt_ctx;
+}
+
+static inline void akcipher_request_complete(struct akcipher_request *req,
+                                             int err)
+{
+        req->base.complete(&req->base, err);
+}
+
+static inline const char *akcipher_alg_name(struct crypto_akcipher *tfm)
+{
+        return crypto_akcipher_tfm(tfm)->__crt_alg->cra_name;
+}
+
+/**
+ * crypto_register_akcipher() -- 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_akcipher(struct akcipher_alg *alg);
+
+/**
+ * crypto_unregister_akcipher() -- Unregister public key algorithm
+ *
+ * Function unregisters an implementation of a public key verify algorithm
+ *
+ * @alg:        algorithm definition
+ */
+void crypto_unregister_akcipher(struct akcipher_alg *alg);
+#endif
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 25a4b71d6d1f..0e3f71a73e3b 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_AKCIPHER        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 4abf2ea6a887..36efbbbf2f83 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_AKCIPHER,     /* struct crypto_report_akcipher */
         __CRYPTOCFGA_MAX
 
 #define CRYPTOCFGA_MAX (__CRYPTOCFGA_MAX - 1)
@@ -101,5 +102,9 @@ struct crypto_report_rng {
         unsigned int seedsize;
 };
 
+struct crypto_report_akcipher {
+        char type[CRYPTO_MAX_NAME];
+};
+
 #define CRYPTO_REPORT_MAXSIZE (sizeof(struct crypto_user_alg) + \
                                sizeof(struct crypto_report_blkcipher))