140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Public Key Signature Algorithm
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*
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* Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <crypto/akcipher.h>
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#include <crypto/internal/sig.h>
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#include <linux/cryptouser.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <net/netlink.h>
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#include "internal.h"
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#define CRYPTO_ALG_TYPE_SIG_MASK 0x0000000e
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static const struct crypto_type crypto_sig_type;
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static int crypto_sig_init_tfm(struct crypto_tfm *tfm)
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{
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if (tfm->__crt_alg->cra_type != &crypto_sig_type)
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return crypto_init_akcipher_ops_sig(tfm);
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return 0;
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}
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static void __maybe_unused crypto_sig_show(struct seq_file *m,
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struct crypto_alg *alg)
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{
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seq_puts(m, "type : sig\n");
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}
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static int __maybe_unused crypto_sig_report(struct sk_buff *skb,
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struct crypto_alg *alg)
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{
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struct crypto_report_akcipher rsig = {};
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strscpy(rsig.type, "sig", sizeof(rsig.type));
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return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, sizeof(rsig), &rsig);
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}
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static const struct crypto_type crypto_sig_type = {
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.extsize = crypto_alg_extsize,
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.init_tfm = crypto_sig_init_tfm,
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#ifdef CONFIG_PROC_FS
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.show = crypto_sig_show,
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#endif
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#if IS_ENABLED(CONFIG_CRYPTO_USER)
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.report = crypto_sig_report,
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#endif
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.maskclear = ~CRYPTO_ALG_TYPE_MASK,
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.maskset = CRYPTO_ALG_TYPE_SIG_MASK,
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.type = CRYPTO_ALG_TYPE_SIG,
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.tfmsize = offsetof(struct crypto_sig, base),
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};
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struct crypto_sig *crypto_alloc_sig(const char *alg_name, u32 type, u32 mask)
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{
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return crypto_alloc_tfm(alg_name, &crypto_sig_type, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_alloc_sig);
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int crypto_sig_maxsize(struct crypto_sig *tfm)
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{
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struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
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return crypto_akcipher_maxsize(*ctx);
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}
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EXPORT_SYMBOL_GPL(crypto_sig_maxsize);
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int crypto_sig_sign(struct crypto_sig *tfm,
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const void *src, unsigned int slen,
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void *dst, unsigned int dlen)
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{
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struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
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struct crypto_akcipher_sync_data data = {
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.tfm = *ctx,
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.src = src,
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.dst = dst,
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.slen = slen,
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.dlen = dlen,
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};
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return crypto_akcipher_sync_prep(&data) ?:
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crypto_akcipher_sync_post(&data,
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crypto_akcipher_sign(data.req));
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}
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EXPORT_SYMBOL_GPL(crypto_sig_sign);
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int crypto_sig_verify(struct crypto_sig *tfm,
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const void *src, unsigned int slen,
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const void *digest, unsigned int dlen)
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{
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struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
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struct crypto_akcipher_sync_data data = {
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.tfm = *ctx,
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.src = src,
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.slen = slen,
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.dlen = dlen,
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};
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int err;
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err = crypto_akcipher_sync_prep(&data);
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if (err)
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return err;
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memcpy(data.buf + slen, digest, dlen);
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return crypto_akcipher_sync_post(&data,
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crypto_akcipher_verify(data.req));
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}
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EXPORT_SYMBOL_GPL(crypto_sig_verify);
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int crypto_sig_set_pubkey(struct crypto_sig *tfm,
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const void *key, unsigned int keylen)
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{
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struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
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return crypto_akcipher_set_pub_key(*ctx, key, keylen);
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}
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EXPORT_SYMBOL_GPL(crypto_sig_set_pubkey);
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int crypto_sig_set_privkey(struct crypto_sig *tfm,
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const void *key, unsigned int keylen)
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{
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struct crypto_akcipher **ctx = crypto_sig_ctx(tfm);
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return crypto_akcipher_set_priv_key(*ctx, key, keylen);
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}
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EXPORT_SYMBOL_GPL(crypto_sig_set_privkey);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Public Key Signature Algorithms");
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