crypto/sig.c

Source file repositories/reference/linux-study-clean/crypto/sig.c

File Facts

System
Linux kernel
Corpus path
crypto/sig.c
Extension
.c
Size
4189 bytes
Lines
183
Domain
Kernel Services
Bucket
crypto
Inferred role
Kernel Services: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <crypto/internal/sig.h>
#include <linux/cryptouser.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <net/netlink.h>

#include "internal.h"

static void crypto_sig_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_sig *sig = __crypto_sig_tfm(tfm);
	struct sig_alg *alg = crypto_sig_alg(sig);

	alg->exit(sig);
}

static int crypto_sig_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_sig *sig = __crypto_sig_tfm(tfm);
	struct sig_alg *alg = crypto_sig_alg(sig);

	if (alg->exit)
		sig->base.exit = crypto_sig_exit_tfm;

	if (alg->init)
		return alg->init(sig);

	return 0;
}

static void crypto_sig_free_instance(struct crypto_instance *inst)
{
	struct sig_instance *sig = sig_instance(inst);

	sig->free(sig);
}

static void __maybe_unused crypto_sig_show(struct seq_file *m,
					   struct crypto_alg *alg)
{
	seq_puts(m, "type         : sig\n");
}

static int __maybe_unused crypto_sig_report(struct sk_buff *skb,
					    struct crypto_alg *alg)
{
	struct crypto_report_sig rsig = {
		.type = "sig",
	};

	return nla_put(skb, CRYPTOCFGA_REPORT_SIG, sizeof(rsig), &rsig);
}

static const struct crypto_type crypto_sig_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_sig_init_tfm,
	.free = crypto_sig_free_instance,
#ifdef CONFIG_PROC_FS
	.show = crypto_sig_show,
#endif
#if IS_ENABLED(CONFIG_CRYPTO_USER)
	.report = crypto_sig_report,
#endif
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_SIG,
	.tfmsize = offsetof(struct crypto_sig, base),
	.algsize = offsetof(struct sig_alg, base),
};

struct crypto_sig *crypto_alloc_sig(const char *alg_name, u32 type, u32 mask)
{
	return crypto_alloc_tfm(alg_name, &crypto_sig_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_sig);

static int sig_default_sign(struct crypto_sig *tfm,
			    const void *src, unsigned int slen,
			    void *dst, unsigned int dlen)
{
	return -ENOSYS;
}

static int sig_default_verify(struct crypto_sig *tfm,
			      const void *src, unsigned int slen,
			      const void *dst, unsigned int dlen)
{
	return -ENOSYS;

Annotation

Implementation Notes