From f4cdf7ca9a1fdcca413157df19753f388a5a224e Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Wed, 19 Aug 2026 10:09:22 -0700 Subject: Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media Pull media updates from Mauro Carvalho Chehab: - v4l2-core: added ISP statistics support and per-block validation - v4l2-core: Allow unknown HDR10 white point and luminance - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor - New codec: Milos: VPU v2.0 codec support - isp driver: gained support for Dreamchip RPPX1 ISP framework - vsp1 driver: gained support for RZ/T2H and RZ/N2H - Novalake driver: gained CVS support for new NVL hardware - dvb-core: fix feed leak on failed DMX_ADD_PID - several driver fixes, cleanups and minor improvements * tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits) media: ipu-bridge: check all DMI entries when overriding sensor rotation media: v4l2-async: avoid deleting unlinked ASC entry on link error media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement media: intel/ipu6: fix async notifier cleanup leak on parse error media: staging/ipu7: fix async notifier UAF on probe error path media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem() media: rcar-isp: Fix VSPX reference leaks media: rcar-isp: Release ISPCORE resources media: i2c: imx415: Release runtime PM reference on VBLANK error media: i2c: imx415: Return test pattern write errors media: renesas: vsp1: Declare index variables in for loop statement media: renesas: vsp1: Make reset control optional to support platforms without a reset line media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs media: nxp: imx8-isi: Add additional 32-bit RGB format support media: nxp: imx8-isi: Add 16-bit raw Bayer format support media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks media: nxp: imx8-isi: Correct color map between V4L2 and ISI ... --- crypto/ecdh.c | 247 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 247 insertions(+) create mode 100644 crypto/ecdh.c (limited to 'crypto/ecdh.c') diff --git a/crypto/ecdh.c b/crypto/ecdh.c new file mode 100644 index 000000000..9f0b93b31 --- /dev/null +++ b/crypto/ecdh.c @@ -0,0 +1,247 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* ECDH key-agreement protocol + * + * Copyright (c) 2016, Intel Corporation + * Authors: Salvator Benedetto + */ + +#include +#include +#include +#include +#include +#include + +struct ecdh_ctx { + unsigned int curve_id; + unsigned int ndigits; + u64 private_key[ECC_MAX_DIGITS]; +}; + +static inline struct ecdh_ctx *ecdh_get_ctx(struct crypto_kpp *tfm) +{ + return kpp_tfm_ctx(tfm); +} + +static int ecdh_set_secret(struct crypto_kpp *tfm, const void *buf, + unsigned int len) +{ + struct ecdh_ctx *ctx = ecdh_get_ctx(tfm); + struct ecdh params; + int ret = 0; + + if (crypto_ecdh_decode_key(buf, len, ¶ms) < 0 || + params.key_size > sizeof(u64) * ctx->ndigits) + return -EINVAL; + + memset(ctx->private_key, 0, sizeof(ctx->private_key)); + + if (!params.key || !params.key_size) + return ecc_gen_privkey(ctx->curve_id, ctx->ndigits, + ctx->private_key); + + ecc_digits_from_bytes(params.key, params.key_size, + ctx->private_key, ctx->ndigits); + + if (ecc_is_key_valid(ctx->curve_id, ctx->ndigits, + ctx->private_key, params.key_size) < 0) { + memzero_explicit(ctx->private_key, params.key_size); + ret = -EINVAL; + } + + return ret; +} + +static int ecdh_compute_value(struct kpp_request *req) +{ + struct crypto_kpp *tfm = crypto_kpp_reqtfm(req); + struct ecdh_ctx *ctx = ecdh_get_ctx(tfm); + u64 *public_key; + u64 *shared_secret = NULL; + void *buf; + size_t copied, nbytes, public_key_sz; + int ret = -ENOMEM; + + nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT; + /* Public part is a point thus it has both coordinates */ + public_key_sz = 2 * nbytes; + + public_key = kmalloc(public_key_sz, GFP_KERNEL); + if (!public_key) + return -ENOMEM; + + if (req->src) { + shared_secret = kmalloc(nbytes, GFP_KERNEL); + if (!shared_secret) + goto free_pubkey; + + /* from here on it's invalid parameters */ + ret = -EINVAL; + + /* must have exactly two points to be on the curve */ + if (public_key_sz != req->src_len) + goto free_all; + + copied = sg_copy_to_buffer(req->src, + sg_nents_for_len(req->src, + public_key_sz), + public_key, public_key_sz); + if (copied != public_key_sz) + goto free_all; + + ret = crypto_ecdh_shared_secret(ctx->curve_id, ctx->ndigits, + ctx->private_key, public_key, + shared_secret); + + buf = shared_secret; + } else { + ret = ecc_make_pub_key(ctx->curve_id, ctx->ndigits, + ctx->private_key, public_key); + buf = public_key; + nbytes = public_key_sz; + } + + if (ret < 0) + goto free_all; + + /* might want less than we've got */ + nbytes = min_t(size_t, nbytes, req->dst_len); + copied = sg_copy_from_buffer(req->dst, sg_nents_for_len(req->dst, + nbytes), + buf, nbytes); + if (copied != nbytes) + ret = -EINVAL; + + /* fall through */ +free_all: + kfree_sensitive(shared_secret); +free_pubkey: + kfree(public_key); + return ret; +} + +static unsigned int ecdh_max_size(struct crypto_kpp *tfm) +{ + struct ecdh_ctx *ctx = ecdh_get_ctx(tfm); + + /* Public key is made of two coordinates, add one to the left shift */ + return ctx->ndigits << (ECC_DIGITS_TO_BYTES_SHIFT + 1); +} + +static int ecdh_nist_p192_init_tfm(struct crypto_kpp *tfm) +{ + struct ecdh_ctx *ctx = ecdh_get_ctx(tfm); + + ctx->curve_id = ECC_CURVE_NIST_P192; + ctx->ndigits = ECC_CURVE_NIST_P192_DIGITS; + + return 0; +} + +static struct kpp_alg ecdh_nist_p192 = { + .set_secret = ecdh_set_secret, + .generate_public_key = ecdh_compute_value, + .compute_shared_secret = ecdh_compute_value, + .max_size = ecdh_max_size, + .init = ecdh_nist_p192_init_tfm, + .base = { + .cra_name = "ecdh-nist-p192", + .cra_driver_name = "ecdh-nist-p192-generic", + .cra_priority = 100, + .cra_module = THIS_MODULE, + .cra_ctxsize = sizeof(struct ecdh_ctx), + }, +}; + +static int ecdh_nist_p256_init_tfm(struct crypto_kpp *tfm) +{ + struct ecdh_ctx *ctx = ecdh_get_ctx(tfm); + + ctx->curve_id = ECC_CURVE_NIST_P256; + ctx->ndigits = ECC_CURVE_NIST_P256_DIGITS; + + return 0; +} + +static struct kpp_alg ecdh_nist_p256 = { + .set_secret = ecdh_set_secret, + .generate_public_key = ecdh_compute_value, + .compute_shared_secret = ecdh_compute_value, + .max_size = ecdh_max_size, + .init = ecdh_nist_p256_init_tfm, + .base = { + .cra_name = "ecdh-nist-p256", + .cra_driver_name = "ecdh-nist-p256-generic", + .cra_priority = 100, + .cra_module = THIS_MODULE, + .cra_ctxsize = sizeof(struct ecdh_ctx), + }, +}; + +static int ecdh_nist_p384_init_tfm(struct crypto_kpp *tfm) +{ + struct ecdh_ctx *ctx = ecdh_get_ctx(tfm); + + ctx->curve_id = ECC_CURVE_NIST_P384; + ctx->ndigits = ECC_CURVE_NIST_P384_DIGITS; + + return 0; +} + +static struct kpp_alg ecdh_nist_p384 = { + .set_secret = ecdh_set_secret, + .generate_public_key = ecdh_compute_value, + .compute_shared_secret = ecdh_compute_value, + .max_size = ecdh_max_size, + .init = ecdh_nist_p384_init_tfm, + .base = { + .cra_name = "ecdh-nist-p384", + .cra_driver_name = "ecdh-nist-p384-generic", + .cra_priority = 100, + .cra_module = THIS_MODULE, + .cra_ctxsize = sizeof(struct ecdh_ctx), + }, +}; + +static bool ecdh_nist_p192_registered; + +static int __init ecdh_init(void) +{ + int ret; + + /* NIST p192 will fail to register in FIPS mode */ + ret = crypto_register_kpp(&ecdh_nist_p192); + ecdh_nist_p192_registered = ret == 0; + + ret = crypto_register_kpp(&ecdh_nist_p256); + if (ret) + goto nist_p256_error; + + ret = crypto_register_kpp(&ecdh_nist_p384); + if (ret) + goto nist_p384_error; + + return 0; + +nist_p384_error: + crypto_unregister_kpp(&ecdh_nist_p256); + +nist_p256_error: + if (ecdh_nist_p192_registered) + crypto_unregister_kpp(&ecdh_nist_p192); + return ret; +} + +static void __exit ecdh_exit(void) +{ + if (ecdh_nist_p192_registered) + crypto_unregister_kpp(&ecdh_nist_p192); + crypto_unregister_kpp(&ecdh_nist_p256); + crypto_unregister_kpp(&ecdh_nist_p384); +} + +module_init(ecdh_init); +module_exit(ecdh_exit); +MODULE_ALIAS_CRYPTO("ecdh"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ECDH generic algorithm"); -- cgit v1.3.1