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-rw-r--r--crypto/sig.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/crypto/sig.c b/crypto/sig.c
new file mode 100644
index 0000000000..224c470192
--- /dev/null
+++ b/crypto/sig.c
@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Public Key Signature Algorithm
+ *
+ * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#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 int __maybe_unused crypto_sig_report_stat(struct sk_buff *skb,
+ struct crypto_alg *alg)
+{
+ struct crypto_stat_akcipher rsig = {};
+
+ strscpy(rsig.type, "sig", sizeof(rsig.type));
+
+ return nla_put(skb, CRYPTOCFGA_STAT_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
+#ifdef CONFIG_CRYPTO_STATS
+ .report_stat = crypto_sig_report_stat,
+#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");