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    Subject[PATCH 05/25] KEYS: Asymmetric public-key algorithm crypto key subtype
    Date
    Add a subtype for supporting asymmetric public-key encryption algorithms such
    as DSA (FIPS-186) and RSA (PKCS#1 / RFC1337).

    Signed-off-by: David Howells <dhowells@redhat.com>
    ---

    security/keys/crypto/Kconfig | 10 +++
    security/keys/crypto/Makefile | 3 +
    security/keys/crypto/public_key.c | 82 +++++++++++++++++++++++++
    security/keys/crypto/public_key.h | 123 +++++++++++++++++++++++++++++++++++++
    4 files changed, 217 insertions(+), 1 deletion(-)
    create mode 100644 security/keys/crypto/public_key.c
    create mode 100644 security/keys/crypto/public_key.h


    diff --git a/security/keys/crypto/Kconfig b/security/keys/crypto/Kconfig
    index 3d15710..5f2b8ac 100644
    --- a/security/keys/crypto/Kconfig
    +++ b/security/keys/crypto/Kconfig
    @@ -5,3 +5,13 @@ config CRYPTO_KEY_TYPE
    This option provides support for a type of key that holds the keys
    required for cryptographic operations such as encryption, decryption,
    signature generation and signature verification.
    +
    +config CRYPTO_KEY_PUBLIC_KEY_SUBTYPE
    + tristate "Asymmetric public-key crypto algorithm subtype"
    + depends on CRYPTO_KEY_TYPE
    + select MPILIB
    + help
    + This option provides support for asymmetric public key type handling.
    + If signature generation and/or verification are to be used,
    + appropriate hash algorithms (such as SHA-1) must be available.
    + ENOPKG will be reported if the requisite algorithm is unavailable.
    diff --git a/security/keys/crypto/Makefile b/security/keys/crypto/Makefile
    index 67001bc..6384306 100644
    --- a/security/keys/crypto/Makefile
    +++ b/security/keys/crypto/Makefile
    @@ -3,5 +3,6 @@
    #

    obj-$(CONFIG_CRYPTO_KEY_TYPE) += crypto_keys.o
    -
    crypto_keys-y := crypto_type.o crypto_verify.o
    +
    +obj-$(CONFIG_CRYPTO_KEY_PUBLIC_KEY_SUBTYPE) += public_key.o
    diff --git a/security/keys/crypto/public_key.c b/security/keys/crypto/public_key.c
    new file mode 100644
    index 0000000..ebb31ec
    --- /dev/null
    +++ b/security/keys/crypto/public_key.c
    @@ -0,0 +1,82 @@
    +/* Asymmetric public key crypto subtype
    + *
    + * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved.
    + * Written by David Howells (dhowells@redhat.com)
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public Licence
    + * as published by the Free Software Foundation; either version
    + * 2 of the Licence, or (at your option) any later version.
    + */
    +
    +#define pr_fmt(fmt) "PKEY: "fmt
    +#include <linux/module.h>
    +#include <linux/export.h>
    +#include <linux/kernel.h>
    +#include "public_key.h"
    +
    +MODULE_LICENSE("GPL");
    +
    +const char *const pkey_algo[PKEY_ALGO__LAST] = {
    + [PKEY_ALGO_DSA] = "DSA",
    + [PKEY_ALGO_RSA] = "RSA",
    +};
    +EXPORT_SYMBOL_GPL(pkey_algo);
    +
    +const char *const pkey_hash_algo[PKEY_HASH__LAST] = {
    + [PKEY_HASH_MD4] = "md4",
    + [PKEY_HASH_MD5] = "md5",
    + [PKEY_HASH_SHA1] = "sha1",
    + [PKEY_HASH_RIPE_MD_160] = "rmd160",
    + [PKEY_HASH_SHA256] = "sha256",
    + [PKEY_HASH_SHA384] = "sha384",
    + [PKEY_HASH_SHA512] = "sha512",
    + [PKEY_HASH_SHA224] = "sha224",
    +};
    +EXPORT_SYMBOL_GPL(pkey_hash_algo);
    +
    +const char *const pkey_id_type[PKEY_ID_TYPE__LAST] = {
    + [PKEY_ID_PGP] = "PGP",
    + [PKEY_ID_X509] = "X509",
    +};
    +EXPORT_SYMBOL_GPL(pkey_id_type);
    +
    +/*
    + * Provide a part of a description of the key for /proc/keys.
    + */
    +static void public_key_describe(const struct key *crypto_key,
    + struct seq_file *m)
    +{
    + struct public_key *key = crypto_key->payload.data;
    +
    + if (key)
    + seq_printf(m, "%s.%s",
    + pkey_id_type[key->id_type], key->algo->name);
    +}
    +
    +/*
    + * Destroy a public key algorithm key
    + */
    +void public_key_destroy(void *payload)
    +{
    + struct public_key *key = payload;
    + int i;
    +
    + if (key) {
    + for (i = 0; i < ARRAY_SIZE(key->mpi); i++)
    + mpi_free(key->mpi[i]);
    + kfree(key);
    + }
    +}
    +EXPORT_SYMBOL_GPL(public_key_destroy);
    +
    +/*
    + * Public key algorithm crypto key subtype
    + */
    +struct crypto_key_subtype public_key_crypto_key_subtype = {
    + .owner = THIS_MODULE,
    + .name = "public_key",
    + .describe = public_key_describe,
    + .destroy = public_key_destroy,
    +};
    +EXPORT_SYMBOL_GPL(public_key_crypto_key_subtype);
    diff --git a/security/keys/crypto/public_key.h b/security/keys/crypto/public_key.h
    new file mode 100644
    index 0000000..228090d
    --- /dev/null
    +++ b/security/keys/crypto/public_key.h
    @@ -0,0 +1,123 @@
    +/* Asymmetric public-key algorithm definitions
    + *
    + * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved.
    + * Written by David Howells (dhowells@redhat.com)
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public Licence
    + * as published by the Free Software Foundation; either version
    + * 2 of the Licence, or (at your option) any later version.
    + */
    +
    +#ifndef _LINUX_PUBLIC_KEY_H
    +#define _LINUX_PUBLIC_KEY_H
    +
    +#include <linux/mpi.h>
    +#include <crypto/hash.h>
    +#include <keys/crypto-subtype.h>
    +
    +struct public_key;
    +struct public_key_signature;
    +
    +enum pkey_algo {
    + PKEY_ALGO_DSA,
    + PKEY_ALGO_RSA,
    + PKEY_ALGO__LAST
    +};
    +
    +extern const char *const pkey_algo[PKEY_ALGO__LAST];
    +
    +enum pkey_hash_algo {
    + PKEY_HASH_MD4,
    + PKEY_HASH_MD5,
    + PKEY_HASH_SHA1,
    + PKEY_HASH_RIPE_MD_160,
    + PKEY_HASH_SHA256,
    + PKEY_HASH_SHA384,
    + PKEY_HASH_SHA512,
    + PKEY_HASH_SHA224,
    + PKEY_HASH__LAST
    +};
    +
    +extern const char *const pkey_hash_algo[PKEY_HASH__LAST];
    +
    +enum pkey_id_type {
    + PKEY_ID_PGP, /* OpenPGP generated key ID */
    + PKEY_ID_X509, /* X.509 arbitrary subjectKeyIdentifier */
    + PKEY_ID_TYPE__LAST
    +};
    +
    +extern const char *const pkey_id_type[PKEY_ID_TYPE__LAST];
    +
    +/*
    + * Public key type definition
    + */
    +struct public_key_algorithm {
    + const char *name;
    + u8 n_pub_mpi; /* Number of MPIs in public key */
    + u8 n_sec_mpi; /* Number of MPIs in secret key */
    + u8 n_sig_mpi; /* Number of MPIs in a signature */
    + int (*verify)(const struct public_key *key,
    + const struct public_key_signature *sig);
    +};
    +
    +/*
    + * Asymmetric public key data
    + */
    +struct public_key {
    + const struct public_key_algorithm *algo;
    + u8 capabilities;
    +#define PKEY_CAN_ENCRYPT 0x01
    +#define PKEY_CAN_DECRYPT 0x02
    +#define PKEY_CAN_ENCDEC (PKEY_CAN_ENCRYPT | PKEY_CAN_DECRYPT)
    +#define PKEY_CAN_SIGN 0x04
    +#define PKEY_CAN_VERIFY 0x08
    +#define PKEY_CAN_SIGVER (PKEY_CAN_SIGN | PKEY_CAN_VERIFY)
    + enum pkey_id_type id_type : 8;
    + union {
    + MPI mpi[5];
    + struct {
    + MPI p; /* DSA prime */
    + MPI q; /* DSA group order */
    + MPI g; /* DSA group generator */
    + MPI y; /* DSA public-key value = g^x mod p */
    + MPI x; /* DSA secret exponent (if present) */
    + } dsa;
    + struct {
    + MPI n; /* RSA public modulus */
    + MPI e; /* RSA public encryption exponent */
    + MPI d; /* RSA secret encryption exponent (if present) */
    + MPI p; /* RSA secret prime (if present) */
    + MPI q; /* RSA secret prime (if present) */
    + } rsa;
    + };
    +
    + u8 key_id[8]; /* ID of this key pair */
    + u8 key_id_size; /* Number of bytes in key_id */
    +};
    +
    +/*
    + * Asymmetric public key algorithm signature data
    + */
    +struct public_key_signature {
    + struct crypto_sig_verify_context base;
    + u8 *digest;
    + enum pkey_hash_algo pkey_hash_algo : 8;
    + u8 signed_hash_msw[2];
    + u8 digest_size; /* Number of bytes in digest */
    + union {
    + MPI mpi[2];
    + struct {
    + MPI s; /* m^d mod n */
    + } rsa;
    + struct {
    + MPI r;
    + MPI s;
    + } dsa;
    + };
    + struct shash_desc hash; /* This must go last! */
    +};
    +
    +extern struct crypto_key_subtype public_key_crypto_key_subtype;
    +
    +#endif /* _LINUX_PUBLIC_KEY_H */


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