[linux.git] / crypto / sig.c

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Public Key Signature Algorithm
 *
 * Copyright (c) 2023 Herbert Xu <[email protected]>
 */

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

#include "internal.h"

#define CRYPTO_ALG_TYPE_SIG_MASK	0x0000000e

static const struct crypto_type crypto_sig_type;

static int crypto_sig_init_tfm(struct crypto_tfm *tfm)
{
	if (tfm->__crt_alg->cra_type != &crypto_sig_type)
		return crypto_init_akcipher_ops_sig(tfm);

	return 0;
}

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_akcipher rsig = {};

	strscpy(rsig.type, "sig", sizeof(rsig.type));

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

static const struct crypto_type crypto_sig_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_sig_init_tfm,
#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_SIG_MASK,
	.type = CRYPTO_ALG_TYPE_SIG,
	.tfmsize = offsetof(struct crypto_sig, 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);

int crypto_sig_maxsize(struct crypto_sig *tfm)
{
	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);

	return crypto_akcipher_maxsize(*ctx);
}
EXPORT_SYMBOL_GPL(crypto_sig_maxsize);

int crypto_sig_sign(struct crypto_sig *tfm,
		    const void *src, unsigned int slen,
		    void *dst, unsigned int dlen)
{
	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
	struct crypto_akcipher_sync_data data = {
		.tfm = *ctx,
		.src = src,
		.dst = dst,
		.slen = slen,
		.dlen = dlen,
	};

	return crypto_akcipher_sync_prep(&data) ?:
	       crypto_akcipher_sync_post(&data,
					 crypto_akcipher_sign(data.req));
}
EXPORT_SYMBOL_GPL(crypto_sig_sign);

int crypto_sig_verify(struct crypto_sig *tfm,
		      const void *src, unsigned int slen,
		      const void *digest, unsigned int dlen)
{
	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
	struct crypto_akcipher_sync_data data = {
		.tfm = *ctx,
		.src = src,
		.slen = slen,
		.dlen = dlen,
	};
	int err;

	err = crypto_akcipher_sync_prep(&data);
	if (err)
		return err;

	memcpy(data.buf + slen, digest, dlen);

	return crypto_akcipher_sync_post(&data,
					 crypto_akcipher_verify(data.req));
}
EXPORT_SYMBOL_GPL(crypto_sig_verify);

int crypto_sig_set_pubkey(struct crypto_sig *tfm,
			  const void *key, unsigned int keylen)
{
	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);

	return crypto_akcipher_set_pub_key(*ctx, key, keylen);
}
EXPORT_SYMBOL_GPL(crypto_sig_set_pubkey);

int crypto_sig_set_privkey(struct crypto_sig *tfm,
			  const void *key, unsigned int keylen)
{
	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);

	return crypto_akcipher_set_priv_key(*ctx, key, keylen);
}
EXPORT_SYMBOL_GPL(crypto_sig_set_privkey);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Public Key Signature Algorithms");
Commit	Line	Data
6cb8815f HX	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
	2	/*
	3	* Public Key Signature Algorithm
	4	*
	5	* Copyright (c) 2023 Herbert Xu <[email protected]>
	6	*/
	7
	8	#include <crypto/akcipher.h>
	9	#include <crypto/internal/sig.h>
	10	#include <linux/cryptouser.h>
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/scatterlist.h>
	14	#include <linux/seq_file.h>
	15	#include <linux/string.h>
	16	#include <net/netlink.h>
	17
	18	#include "internal.h"
	19
	20	#define CRYPTO_ALG_TYPE_SIG_MASK 0x0000000e
	21
	22	static const struct crypto_type crypto_sig_type;
	23
6cb8815f HX	24	static int crypto_sig_init_tfm(struct crypto_tfm *tfm)
	25	{
	26	if (tfm->__crt_alg->cra_type != &crypto_sig_type)
	27	return crypto_init_akcipher_ops_sig(tfm);
	28
	29	return 0;
	30	}
	31
	32	static void __maybe_unused crypto_sig_show(struct seq_file *m,
	33	struct crypto_alg *alg)
	34	{
	35	seq_puts(m, "type : sig\n");
	36	}
	37
	38	static int __maybe_unused crypto_sig_report(struct sk_buff *skb,
	39	struct crypto_alg *alg)
	40	{
	41	struct crypto_report_akcipher rsig = {};
	42
	43	strscpy(rsig.type, "sig", sizeof(rsig.type));
	44
	45	return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, sizeof(rsig), &rsig);
	46	}
	47
6cb8815f HX	48	static const struct crypto_type crypto_sig_type = {
	49	.extsize = crypto_alg_extsize,
	50	.init_tfm = crypto_sig_init_tfm,
	51	#ifdef CONFIG_PROC_FS
	52	.show = crypto_sig_show,
	53	#endif
	54	#if IS_ENABLED(CONFIG_CRYPTO_USER)
	55	.report = crypto_sig_report,
6cb8815f HX	56	#endif
	57	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	58	.maskset = CRYPTO_ALG_TYPE_SIG_MASK,
	59	.type = CRYPTO_ALG_TYPE_SIG,
	60	.tfmsize = offsetof(struct crypto_sig, base),
	61	};
	62
	63	struct crypto_sig crypto_alloc_sig(const char alg_name, u32 type, u32 mask)
	64	{
	65	return crypto_alloc_tfm(alg_name, &crypto_sig_type, type, mask);
	66	}
	67	EXPORT_SYMBOL_GPL(crypto_alloc_sig);
	68
	69	int crypto_sig_maxsize(struct crypto_sig *tfm)
	70	{
	71	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
	72
	73	return crypto_akcipher_maxsize(*ctx);
	74	}
	75	EXPORT_SYMBOL_GPL(crypto_sig_maxsize);
	76
	77	int crypto_sig_sign(struct crypto_sig *tfm,
	78	const void *src, unsigned int slen,
	79	void *dst, unsigned int dlen)
	80	{
	81	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
	82	struct crypto_akcipher_sync_data data = {
	83	.tfm = *ctx,
	84	.src = src,
	85	.dst = dst,
	86	.slen = slen,
	87	.dlen = dlen,
	88	};
	89
	90	return crypto_akcipher_sync_prep(&data) ?:
	91	crypto_akcipher_sync_post(&data,
	92	crypto_akcipher_sign(data.req));
	93	}
	94	EXPORT_SYMBOL_GPL(crypto_sig_sign);
	95
	96	int crypto_sig_verify(struct crypto_sig *tfm,
	97	const void *src, unsigned int slen,
	98	const void *digest, unsigned int dlen)
	99	{
	100	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
	101	struct crypto_akcipher_sync_data data = {
	102	.tfm = *ctx,
	103	.src = src,
	104	.slen = slen,
	105	.dlen = dlen,
	106	};
	107	int err;
	108
	109	err = crypto_akcipher_sync_prep(&data);
	110	if (err)
	111	return err;
	112
891ebfdf	113	memcpy(data.buf + slen, digest, dlen);
6cb8815f HX	114
	115	return crypto_akcipher_sync_post(&data,
	116	crypto_akcipher_verify(data.req));
	117	}
	118	EXPORT_SYMBOL_GPL(crypto_sig_verify);
	119
	120	int crypto_sig_set_pubkey(struct crypto_sig *tfm,
	121	const void *key, unsigned int keylen)
	122	{
	123	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
	124
	125	return crypto_akcipher_set_pub_key(*ctx, key, keylen);
	126	}
	127	EXPORT_SYMBOL_GPL(crypto_sig_set_pubkey);
	128
	129	int crypto_sig_set_privkey(struct crypto_sig *tfm,
	130	const void *key, unsigned int keylen)
	131	{
	132	struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
	133
	134	return crypto_akcipher_set_priv_key(*ctx, key, keylen);
	135	}
	136	EXPORT_SYMBOL_GPL(crypto_sig_set_privkey);
	137
	138	MODULE_LICENSE("GPL");
	139	MODULE_DESCRIPTION("Public Key Signature Algorithms");