From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- crypto/ecdsa.c | 347 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 347 insertions(+) create mode 100644 crypto/ecdsa.c (limited to 'crypto/ecdsa.c') diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c new file mode 100644 index 000000000..ce8e43648 --- /dev/null +++ b/crypto/ecdsa.c @@ -0,0 +1,347 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2021 IBM Corporation + */ + +#include +#include +#include +#include +#include +#include + +struct ecc_ctx { + unsigned int curve_id; + const struct ecc_curve *curve; + + bool pub_key_set; + u64 x[ECC_MAX_DIGITS]; /* pub key x and y coordinates */ + u64 y[ECC_MAX_DIGITS]; + struct ecc_point pub_key; +}; + +static int _ecdsa_verify(struct ecc_ctx *ctx, const u64 *hash, const u64 *r, const u64 *s) +{ + const struct ecc_curve *curve = ctx->curve; + unsigned int ndigits = curve->g.ndigits; + u64 s1[ECC_MAX_DIGITS]; + u64 u1[ECC_MAX_DIGITS]; + u64 u2[ECC_MAX_DIGITS]; + u64 x1[ECC_MAX_DIGITS]; + u64 y1[ECC_MAX_DIGITS]; + struct ecc_point res = ECC_POINT_INIT(x1, y1, ndigits); + + /* 0 < r < n and 0 < s < n */ + if (vli_is_zero(r, ndigits) || vli_cmp(r, curve->n, ndigits) >= 0 || + vli_is_zero(s, ndigits) || vli_cmp(s, curve->n, ndigits) >= 0) + return -EBADMSG; + + /* hash is given */ + pr_devel("hash : %016llx %016llx ... %016llx\n", + hash[ndigits - 1], hash[ndigits - 2], hash[0]); + + /* s1 = (s^-1) mod n */ + vli_mod_inv(s1, s, curve->n, ndigits); + /* u1 = (hash * s1) mod n */ + vli_mod_mult_slow(u1, hash, s1, curve->n, ndigits); + /* u2 = (r * s1) mod n */ + vli_mod_mult_slow(u2, r, s1, curve->n, ndigits); + /* res = u1*G + u2 * pub_key */ + ecc_point_mult_shamir(&res, u1, &curve->g, u2, &ctx->pub_key, curve); + + /* res.x = res.x mod n (if res.x > order) */ + if (unlikely(vli_cmp(res.x, curve->n, ndigits) == 1)) + /* faster alternative for NIST p521, p384, p256 & p192 */ + vli_sub(res.x, res.x, curve->n, ndigits); + + if (!vli_cmp(res.x, r, ndigits)) + return 0; + + return -EKEYREJECTED; +} + +/* + * Verify an ECDSA signature. + */ +static int ecdsa_verify(struct crypto_sig *tfm, + const void *src, unsigned int slen, + const void *digest, unsigned int dlen) +{ + struct ecc_ctx *ctx = crypto_sig_ctx(tfm); + size_t bufsize = ctx->curve->g.ndigits * sizeof(u64); + const struct ecdsa_raw_sig *sig = src; + u64 hash[ECC_MAX_DIGITS]; + + if (unlikely(!ctx->pub_key_set)) + return -EINVAL; + + if (slen != sizeof(*sig)) + return -EINVAL; + + if (bufsize > dlen) + bufsize = dlen; + + ecc_digits_from_bytes(digest, bufsize, hash, ctx->curve->g.ndigits); + + return _ecdsa_verify(ctx, hash, sig->r, sig->s); +} + +static int ecdsa_ecc_ctx_init(struct ecc_ctx *ctx, unsigned int curve_id) +{ + ctx->curve_id = curve_id; + ctx->curve = ecc_get_curve(curve_id); + if (!ctx->curve) + return -EINVAL; + + return 0; +} + + +static void ecdsa_ecc_ctx_deinit(struct ecc_ctx *ctx) +{ + ctx->pub_key_set = false; +} + +static int ecdsa_ecc_ctx_reset(struct ecc_ctx *ctx) +{ + unsigned int curve_id = ctx->curve_id; + int ret; + + ecdsa_ecc_ctx_deinit(ctx); + ret = ecdsa_ecc_ctx_init(ctx, curve_id); + if (ret == 0) + ctx->pub_key = ECC_POINT_INIT(ctx->x, ctx->y, + ctx->curve->g.ndigits); + return ret; +} + +/* + * Set the public ECC key as defined by RFC5480 section 2.2 "Subject Public + * Key". Only the uncompressed format is supported. + */ +static int ecdsa_set_pub_key(struct crypto_sig *tfm, const void *key, + unsigned int keylen) +{ + struct ecc_ctx *ctx = crypto_sig_ctx(tfm); + unsigned int digitlen, ndigits; + const unsigned char *d = key; + int ret; + + ret = ecdsa_ecc_ctx_reset(ctx); + if (ret < 0) + return ret; + + if (keylen < 1 || ((keylen - 1) & 1) != 0) + return -EINVAL; + /* we only accept uncompressed format indicated by '4' */ + if (d[0] != 4) + return -EINVAL; + + keylen--; + digitlen = keylen >> 1; + + ndigits = DIV_ROUND_UP(digitlen, sizeof(u64)); + if (ndigits != ctx->curve->g.ndigits) + return -EINVAL; + + d++; + + ecc_digits_from_bytes(d, digitlen, ctx->pub_key.x, ndigits); + ecc_digits_from_bytes(&d[digitlen], digitlen, ctx->pub_key.y, ndigits); + + ret = ecc_is_pubkey_valid_full(ctx->curve, &ctx->pub_key); + + ctx->pub_key_set = ret == 0; + + return ret; +} + +static void ecdsa_exit_tfm(struct crypto_sig *tfm) +{ + struct ecc_ctx *ctx = crypto_sig_ctx(tfm); + + ecdsa_ecc_ctx_deinit(ctx); +} + +static unsigned int ecdsa_key_size(struct crypto_sig *tfm) +{ + struct ecc_ctx *ctx = crypto_sig_ctx(tfm); + + return ctx->curve->nbits; +} + +static unsigned int ecdsa_digest_size(struct crypto_sig *tfm) +{ + /* + * ECDSA key sizes are much smaller than RSA, and thus could + * operate on (hashed) inputs that are larger than the key size. + * E.g. SHA384-hashed input used with secp256r1 based keys. + * Return the largest supported hash size (SHA512). + */ + return SHA512_DIGEST_SIZE; +} + +static int ecdsa_nist_p521_init_tfm(struct crypto_sig *tfm) +{ + struct ecc_ctx *ctx = crypto_sig_ctx(tfm); + + return ecdsa_ecc_ctx_init(ctx, ECC_CURVE_NIST_P521); +} + +static struct sig_alg ecdsa_nist_p521 = { + .verify = ecdsa_verify, + .set_pub_key = ecdsa_set_pub_key, + .key_size = ecdsa_key_size, + .digest_size = ecdsa_digest_size, + .init = ecdsa_nist_p521_init_tfm, + .exit = ecdsa_exit_tfm, + .base = { + .cra_name = "ecdsa-nist-p521", + .cra_driver_name = "ecdsa-nist-p521-generic", + .cra_priority = 100, + .cra_module = THIS_MODULE, + .cra_ctxsize = sizeof(struct ecc_ctx), + }, +}; + +static int ecdsa_nist_p384_init_tfm(struct crypto_sig *tfm) +{ + struct ecc_ctx *ctx = crypto_sig_ctx(tfm); + + return ecdsa_ecc_ctx_init(ctx, ECC_CURVE_NIST_P384); +} + +static struct sig_alg ecdsa_nist_p384 = { + .verify = ecdsa_verify, + .set_pub_key = ecdsa_set_pub_key, + .key_size = ecdsa_key_size, + .digest_size = ecdsa_digest_size, + .init = ecdsa_nist_p384_init_tfm, + .exit = ecdsa_exit_tfm, + .base = { + .cra_name = "ecdsa-nist-p384", + .cra_driver_name = "ecdsa-nist-p384-generic", + .cra_priority = 100, + .cra_module = THIS_MODULE, + .cra_ctxsize = sizeof(struct ecc_ctx), + }, +}; + +static int ecdsa_nist_p256_init_tfm(struct crypto_sig *tfm) +{ + struct ecc_ctx *ctx = crypto_sig_ctx(tfm); + + return ecdsa_ecc_ctx_init(ctx, ECC_CURVE_NIST_P256); +} + +static struct sig_alg ecdsa_nist_p256 = { + .verify = ecdsa_verify, + .set_pub_key = ecdsa_set_pub_key, + .key_size = ecdsa_key_size, + .digest_size = ecdsa_digest_size, + .init = ecdsa_nist_p256_init_tfm, + .exit = ecdsa_exit_tfm, + .base = { + .cra_name = "ecdsa-nist-p256", + .cra_driver_name = "ecdsa-nist-p256-generic", + .cra_priority = 100, + .cra_module = THIS_MODULE, + .cra_ctxsize = sizeof(struct ecc_ctx), + }, +}; + +static int ecdsa_nist_p192_init_tfm(struct crypto_sig *tfm) +{ + struct ecc_ctx *ctx = crypto_sig_ctx(tfm); + + return ecdsa_ecc_ctx_init(ctx, ECC_CURVE_NIST_P192); +} + +static struct sig_alg ecdsa_nist_p192 = { + .verify = ecdsa_verify, + .set_pub_key = ecdsa_set_pub_key, + .key_size = ecdsa_key_size, + .digest_size = ecdsa_digest_size, + .init = ecdsa_nist_p192_init_tfm, + .exit = ecdsa_exit_tfm, + .base = { + .cra_name = "ecdsa-nist-p192", + .cra_driver_name = "ecdsa-nist-p192-generic", + .cra_priority = 100, + .cra_module = THIS_MODULE, + .cra_ctxsize = sizeof(struct ecc_ctx), + }, +}; +static bool ecdsa_nist_p192_registered; + +static int __init ecdsa_init(void) +{ + int ret; + + /* NIST p192 may not be available in FIPS mode */ + ret = crypto_register_sig(&ecdsa_nist_p192); + ecdsa_nist_p192_registered = ret == 0; + + ret = crypto_register_sig(&ecdsa_nist_p256); + if (ret) + goto nist_p256_error; + + ret = crypto_register_sig(&ecdsa_nist_p384); + if (ret) + goto nist_p384_error; + + ret = crypto_register_sig(&ecdsa_nist_p521); + if (ret) + goto nist_p521_error; + + ret = crypto_register_template(&ecdsa_x962_tmpl); + if (ret) + goto x962_tmpl_error; + + ret = crypto_register_template(&ecdsa_p1363_tmpl); + if (ret) + goto p1363_tmpl_error; + + return 0; + +p1363_tmpl_error: + crypto_unregister_template(&ecdsa_x962_tmpl); + +x962_tmpl_error: + crypto_unregister_sig(&ecdsa_nist_p521); + +nist_p521_error: + crypto_unregister_sig(&ecdsa_nist_p384); + +nist_p384_error: + crypto_unregister_sig(&ecdsa_nist_p256); + +nist_p256_error: + if (ecdsa_nist_p192_registered) + crypto_unregister_sig(&ecdsa_nist_p192); + return ret; +} + +static void __exit ecdsa_exit(void) +{ + crypto_unregister_template(&ecdsa_x962_tmpl); + crypto_unregister_template(&ecdsa_p1363_tmpl); + + if (ecdsa_nist_p192_registered) + crypto_unregister_sig(&ecdsa_nist_p192); + crypto_unregister_sig(&ecdsa_nist_p256); + crypto_unregister_sig(&ecdsa_nist_p384); + crypto_unregister_sig(&ecdsa_nist_p521); +} + +module_init(ecdsa_init); +module_exit(ecdsa_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Stefan Berger "); +MODULE_DESCRIPTION("ECDSA generic algorithm"); +MODULE_ALIAS_CRYPTO("ecdsa-nist-p192"); +MODULE_ALIAS_CRYPTO("ecdsa-nist-p256"); +MODULE_ALIAS_CRYPTO("ecdsa-nist-p384"); +MODULE_ALIAS_CRYPTO("ecdsa-nist-p521"); +MODULE_ALIAS_CRYPTO("ecdsa-generic"); -- cgit v1.3.1