diff options
Diffstat (limited to 'crypto/ecdsa-p1363.c')
| -rw-r--r-- | crypto/ecdsa-p1363.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/crypto/ecdsa-p1363.c b/crypto/ecdsa-p1363.c new file mode 100644 index 000000000000..eaae7214d69b --- /dev/null +++ b/crypto/ecdsa-p1363.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ECDSA P1363 signature encoding + * + * Copyright (c) 2024 Intel Corporation + */ + +#include <linux/err.h> +#include <linux/module.h> +#include <crypto/algapi.h> +#include <crypto/sig.h> +#include <crypto/internal/ecc.h> +#include <crypto/internal/sig.h> + +struct ecdsa_p1363_ctx { + struct crypto_sig *child; +}; + +static int ecdsa_p1363_verify(struct crypto_sig *tfm, + const void *src, unsigned int slen, + const void *digest, unsigned int dlen) +{ + struct ecdsa_p1363_ctx *ctx = crypto_sig_ctx(tfm); + unsigned int keylen = crypto_sig_keysize(ctx->child); + unsigned int ndigits = DIV_ROUND_UP(keylen, sizeof(u64)); + struct ecdsa_raw_sig sig; + + if (slen != 2 * keylen) + return -EINVAL; + + ecc_digits_from_bytes(src, keylen, sig.r, ndigits); + ecc_digits_from_bytes(src + keylen, keylen, sig.s, ndigits); + + return crypto_sig_verify(ctx->child, &sig, sizeof(sig), digest, dlen); +} + +static unsigned int ecdsa_p1363_key_size(struct crypto_sig *tfm) +{ + struct ecdsa_p1363_ctx *ctx = crypto_sig_ctx(tfm); + + return crypto_sig_keysize(ctx->child); +} + +static unsigned int ecdsa_p1363_max_size(struct crypto_sig *tfm) +{ + struct ecdsa_p1363_ctx *ctx = crypto_sig_ctx(tfm); + + return 2 * crypto_sig_keysize(ctx->child); +} + +static unsigned int ecdsa_p1363_digest_size(struct crypto_sig *tfm) +{ + struct ecdsa_p1363_ctx *ctx = crypto_sig_ctx(tfm); + + return crypto_sig_digestsize(ctx->child); +} + +static int ecdsa_p1363_set_pub_key(struct crypto_sig *tfm, + const void *key, unsigned int keylen) +{ + struct ecdsa_p1363_ctx *ctx = crypto_sig_ctx(tfm); + + return crypto_sig_set_pubkey(ctx->child, key, keylen); +} + +static int ecdsa_p1363_init_tfm(struct crypto_sig *tfm) +{ + struct sig_instance *inst = sig_alg_instance(tfm); + struct crypto_sig_spawn *spawn = sig_instance_ctx(inst); + struct ecdsa_p1363_ctx *ctx = crypto_sig_ctx(tfm); + struct crypto_sig *child_tfm; + + child_tfm = crypto_spawn_sig(spawn); + if (IS_ERR(child_tfm)) + return PTR_ERR(child_tfm); + + ctx->child = child_tfm; + + return 0; +} + +static void ecdsa_p1363_exit_tfm(struct crypto_sig *tfm) +{ + struct ecdsa_p1363_ctx *ctx = crypto_sig_ctx(tfm); + + crypto_free_sig(ctx->child); +} + +static void ecdsa_p1363_free(struct sig_instance *inst) +{ + struct crypto_sig_spawn *spawn = sig_instance_ctx(inst); + + crypto_drop_sig(spawn); + kfree(inst); +} + +static int ecdsa_p1363_create(struct crypto_template *tmpl, struct rtattr **tb) +{ + struct crypto_sig_spawn *spawn; + struct sig_instance *inst; + struct sig_alg *ecdsa_alg; + u32 mask; + int err; + + err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SIG, &mask); + if (err) + return err; + + inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); + if (!inst) + return -ENOMEM; + + spawn = sig_instance_ctx(inst); + + err = crypto_grab_sig(spawn, sig_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), 0, mask); + if (err) + goto err_free_inst; + + ecdsa_alg = crypto_spawn_sig_alg(spawn); + + err = -EINVAL; + if (strncmp(ecdsa_alg->base.cra_name, "ecdsa", 5) != 0) + goto err_free_inst; + + err = crypto_inst_setname(sig_crypto_instance(inst), tmpl->name, + &ecdsa_alg->base); + if (err) + goto err_free_inst; + + inst->alg.base.cra_priority = ecdsa_alg->base.cra_priority; + inst->alg.base.cra_ctxsize = sizeof(struct ecdsa_p1363_ctx); + + inst->alg.init = ecdsa_p1363_init_tfm; + inst->alg.exit = ecdsa_p1363_exit_tfm; + + inst->alg.verify = ecdsa_p1363_verify; + inst->alg.key_size = ecdsa_p1363_key_size; + inst->alg.max_size = ecdsa_p1363_max_size; + inst->alg.digest_size = ecdsa_p1363_digest_size; + inst->alg.set_pub_key = ecdsa_p1363_set_pub_key; + + inst->free = ecdsa_p1363_free; + + err = sig_register_instance(tmpl, inst); + if (err) { +err_free_inst: + ecdsa_p1363_free(inst); + } + return err; +} + +struct crypto_template ecdsa_p1363_tmpl = { + .name = "p1363", + .create = ecdsa_p1363_create, + .module = THIS_MODULE, +}; + +MODULE_ALIAS_CRYPTO("p1363"); |