On Wed, May 6, 2015 at 12:36 PM, Tadeusz Struk <tadeusz.struk@xxxxxxxxx> wrote:
> Add Public Key Encryption API.
>
> Signed-off-by: Tadeusz Struk <tadeusz.struk@xxxxxxxxx>
> ---
> 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));
While subtype and cra_name are the same length, it may be possible to
pass an unterminated cra_name? Should this use strlcpy instead of
strncpy?
> + 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@xxxxxxxxx>
> + *
> + * 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
This is identical to crypto_user's crypto_pkey_report. Perhaps extract it?
> +
> +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@xxxxxxxxx>
> + *
> + * 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))
>
Thanks!
-Kees
--
Kees Cook
Chrome OS Security
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