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![Daniele Alessandrelli](/assets/img/avatar_default.png)
Move ecc.h header file to 'include/crypto/internal' so that it can be easily imported from everywhere in the kernel tree. This change is done to allow crypto device drivers to re-use the symbols exported by 'crypto/ecc.c', thus avoiding code duplication. Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
242 lines
5.7 KiB
C
242 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* ECDH key-agreement protocol
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*
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* Copyright (c) 2016, Intel Corporation
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* Authors: Salvator Benedetto <salvatore.benedetto@intel.com>
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*/
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#include <linux/module.h>
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#include <crypto/internal/ecc.h>
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#include <crypto/internal/kpp.h>
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#include <crypto/kpp.h>
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#include <crypto/ecdh.h>
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#include <linux/scatterlist.h>
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struct ecdh_ctx {
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unsigned int curve_id;
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unsigned int ndigits;
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u64 private_key[ECC_MAX_DIGITS];
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};
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static inline struct ecdh_ctx *ecdh_get_ctx(struct crypto_kpp *tfm)
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{
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return kpp_tfm_ctx(tfm);
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}
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static int ecdh_set_secret(struct crypto_kpp *tfm, const void *buf,
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unsigned int len)
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{
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struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
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struct ecdh params;
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if (crypto_ecdh_decode_key(buf, len, ¶ms) < 0 ||
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params.key_size > sizeof(u64) * ctx->ndigits)
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return -EINVAL;
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if (!params.key || !params.key_size)
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return ecc_gen_privkey(ctx->curve_id, ctx->ndigits,
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ctx->private_key);
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memcpy(ctx->private_key, params.key, params.key_size);
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if (ecc_is_key_valid(ctx->curve_id, ctx->ndigits,
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ctx->private_key, params.key_size) < 0) {
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memzero_explicit(ctx->private_key, params.key_size);
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return -EINVAL;
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}
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return 0;
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}
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static int ecdh_compute_value(struct kpp_request *req)
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{
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struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
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struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
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u64 *public_key;
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u64 *shared_secret = NULL;
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void *buf;
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size_t copied, nbytes, public_key_sz;
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int ret = -ENOMEM;
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nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
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/* Public part is a point thus it has both coordinates */
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public_key_sz = 2 * nbytes;
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public_key = kmalloc(public_key_sz, GFP_KERNEL);
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if (!public_key)
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return -ENOMEM;
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if (req->src) {
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shared_secret = kmalloc(nbytes, GFP_KERNEL);
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if (!shared_secret)
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goto free_pubkey;
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/* from here on it's invalid parameters */
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ret = -EINVAL;
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/* must have exactly two points to be on the curve */
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if (public_key_sz != req->src_len)
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goto free_all;
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copied = sg_copy_to_buffer(req->src,
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sg_nents_for_len(req->src,
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public_key_sz),
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public_key, public_key_sz);
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if (copied != public_key_sz)
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goto free_all;
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ret = crypto_ecdh_shared_secret(ctx->curve_id, ctx->ndigits,
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ctx->private_key, public_key,
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shared_secret);
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buf = shared_secret;
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} else {
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ret = ecc_make_pub_key(ctx->curve_id, ctx->ndigits,
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ctx->private_key, public_key);
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buf = public_key;
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nbytes = public_key_sz;
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}
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if (ret < 0)
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goto free_all;
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/* might want less than we've got */
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nbytes = min_t(size_t, nbytes, req->dst_len);
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copied = sg_copy_from_buffer(req->dst, sg_nents_for_len(req->dst,
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nbytes),
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buf, nbytes);
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if (copied != nbytes)
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ret = -EINVAL;
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/* fall through */
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free_all:
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kfree_sensitive(shared_secret);
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free_pubkey:
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kfree(public_key);
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return ret;
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}
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static unsigned int ecdh_max_size(struct crypto_kpp *tfm)
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{
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struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
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/* Public key is made of two coordinates, add one to the left shift */
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return ctx->ndigits << (ECC_DIGITS_TO_BYTES_SHIFT + 1);
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}
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static int ecdh_nist_p192_init_tfm(struct crypto_kpp *tfm)
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{
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struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
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ctx->curve_id = ECC_CURVE_NIST_P192;
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ctx->ndigits = ECC_CURVE_NIST_P192_DIGITS;
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return 0;
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}
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static struct kpp_alg ecdh_nist_p192 = {
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.set_secret = ecdh_set_secret,
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.generate_public_key = ecdh_compute_value,
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.compute_shared_secret = ecdh_compute_value,
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.max_size = ecdh_max_size,
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.init = ecdh_nist_p192_init_tfm,
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.base = {
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.cra_name = "ecdh-nist-p192",
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.cra_driver_name = "ecdh-nist-p192-generic",
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.cra_priority = 100,
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.cra_module = THIS_MODULE,
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.cra_ctxsize = sizeof(struct ecdh_ctx),
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},
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};
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static int ecdh_nist_p256_init_tfm(struct crypto_kpp *tfm)
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{
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struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
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ctx->curve_id = ECC_CURVE_NIST_P256;
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ctx->ndigits = ECC_CURVE_NIST_P256_DIGITS;
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return 0;
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}
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static struct kpp_alg ecdh_nist_p256 = {
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.set_secret = ecdh_set_secret,
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.generate_public_key = ecdh_compute_value,
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.compute_shared_secret = ecdh_compute_value,
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.max_size = ecdh_max_size,
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.init = ecdh_nist_p256_init_tfm,
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.base = {
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.cra_name = "ecdh-nist-p256",
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.cra_driver_name = "ecdh-nist-p256-generic",
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.cra_priority = 100,
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.cra_module = THIS_MODULE,
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.cra_ctxsize = sizeof(struct ecdh_ctx),
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},
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};
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static int ecdh_nist_p384_init_tfm(struct crypto_kpp *tfm)
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{
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struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
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ctx->curve_id = ECC_CURVE_NIST_P384;
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ctx->ndigits = ECC_CURVE_NIST_P384_DIGITS;
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return 0;
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}
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static struct kpp_alg ecdh_nist_p384 = {
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.set_secret = ecdh_set_secret,
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.generate_public_key = ecdh_compute_value,
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.compute_shared_secret = ecdh_compute_value,
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.max_size = ecdh_max_size,
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.init = ecdh_nist_p384_init_tfm,
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.base = {
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.cra_name = "ecdh-nist-p384",
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.cra_driver_name = "ecdh-nist-p384-generic",
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.cra_priority = 100,
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.cra_module = THIS_MODULE,
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.cra_ctxsize = sizeof(struct ecdh_ctx),
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},
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};
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static bool ecdh_nist_p192_registered;
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static int ecdh_init(void)
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{
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int ret;
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/* NIST p192 will fail to register in FIPS mode */
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ret = crypto_register_kpp(&ecdh_nist_p192);
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ecdh_nist_p192_registered = ret == 0;
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ret = crypto_register_kpp(&ecdh_nist_p256);
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if (ret)
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goto nist_p256_error;
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ret = crypto_register_kpp(&ecdh_nist_p384);
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if (ret)
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goto nist_p384_error;
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return 0;
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nist_p384_error:
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crypto_unregister_kpp(&ecdh_nist_p256);
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nist_p256_error:
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if (ecdh_nist_p192_registered)
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crypto_unregister_kpp(&ecdh_nist_p192);
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return ret;
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}
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static void ecdh_exit(void)
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{
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if (ecdh_nist_p192_registered)
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crypto_unregister_kpp(&ecdh_nist_p192);
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crypto_unregister_kpp(&ecdh_nist_p256);
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crypto_unregister_kpp(&ecdh_nist_p384);
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}
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subsys_initcall(ecdh_init);
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module_exit(ecdh_exit);
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MODULE_ALIAS_CRYPTO("ecdh");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ECDH generic algorithm");
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