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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Crypto API support for SHA-1 and HMAC-SHA1
*
* Copyright (c) Alan Smithee.
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
* Copyright 2025 Google LLC
*/
#include <crypto/internal/hash.h>
#include <crypto/sha1.h>
#include <linux/kernel.h>
#include <linux/module.h>
/*
* Export and import functions. crypto_shash wants a particular format that
* matches that used by some legacy drivers. It currently is the same as the
* library SHA context, except the value in bytecount must be block-aligned and
* the remainder must be stored in an extra u8 appended to the struct.
*/
#define SHA1_SHASH_STATE_SIZE (sizeof(struct sha1_ctx) + 1)
static_assert(sizeof(struct sha1_ctx) == sizeof(struct sha1_state));
static_assert(offsetof(struct sha1_ctx, state) == offsetof(struct sha1_state, state));
static_assert(offsetof(struct sha1_ctx, bytecount) == offsetof(struct sha1_state, count));
static_assert(offsetof(struct sha1_ctx, buf) == offsetof(struct sha1_state, buffer));
static int __crypto_sha1_export(const struct sha1_ctx *ctx0, void *out)
{
struct sha1_ctx ctx = *ctx0;
unsigned int partial;
u8 *p = out;
partial = ctx.bytecount % SHA1_BLOCK_SIZE;
ctx.bytecount -= partial;
memcpy(p, &ctx, sizeof(ctx));
p += sizeof(ctx);
*p = partial;
return 0;
}
static int __crypto_sha1_import(struct sha1_ctx *ctx, const void *in)
{
const u8 *p = in;
memcpy(ctx, p, sizeof(*ctx));
p += sizeof(*ctx);
ctx->bytecount += *p;
return 0;
}
const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
0xaf, 0xd8, 0x07, 0x09
};
EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
#define SHA1_CTX(desc) ((struct sha1_ctx *)shash_desc_ctx(desc))
static int crypto_sha1_init(struct shash_desc *desc)
{
sha1_init(SHA1_CTX(desc));
return 0;
}
static int crypto_sha1_update(struct shash_desc *desc,
const u8 *data, unsigned int len)
{
sha1_update(SHA1_CTX(desc), data, len);
return 0;
}
static int crypto_sha1_final(struct shash_desc *desc, u8 *out)
{
sha1_final(SHA1_CTX(desc), out);
return 0;
}
static int crypto_sha1_digest(struct shash_desc *desc,
const u8 *data, unsigned int len, u8 *out)
{
sha1(data, len, out);
return 0;
}
static int crypto_sha1_export(struct shash_desc *desc, void *out)
{
return __crypto_sha1_export(SHA1_CTX(desc), out);
}
static int crypto_sha1_import(struct shash_desc *desc, const void *in)
{
return __crypto_sha1_import(SHA1_CTX(desc), in);
}
#define HMAC_SHA1_KEY(tfm) ((struct hmac_sha1_key *)crypto_shash_ctx(tfm))
#define HMAC_SHA1_CTX(desc) ((struct hmac_sha1_ctx *)shash_desc_ctx(desc))
static int crypto_hmac_sha1_setkey(struct crypto_shash *tfm,
const u8 *raw_key, unsigned int keylen)
{
hmac_sha1_preparekey(HMAC_SHA1_KEY(tfm), raw_key, keylen);
return 0;
}
static int crypto_hmac_sha1_init(struct shash_desc *desc)
{
hmac_sha1_init(HMAC_SHA1_CTX(desc), HMAC_SHA1_KEY(desc->tfm));
return 0;
}
static int crypto_hmac_sha1_update(struct shash_desc *desc,
const u8 *data, unsigned int len)
{
hmac_sha1_update(HMAC_SHA1_CTX(desc), data, len);
return 0;
}
static int crypto_hmac_sha1_final(struct shash_desc *desc, u8 *out)
{
hmac_sha1_final(HMAC_SHA1_CTX(desc), out);
return 0;
}
static int crypto_hmac_sha1_digest(struct shash_desc *desc,
const u8 *data, unsigned int len, u8 *out)
{
hmac_sha1(HMAC_SHA1_KEY(desc->tfm), data, len, out);
return 0;
}
static int crypto_hmac_sha1_export(struct shash_desc *desc, void *out)
{
return __crypto_sha1_export(&HMAC_SHA1_CTX(desc)->sha_ctx, out);
}
static int crypto_hmac_sha1_import(struct shash_desc *desc, const void *in)
{
struct hmac_sha1_ctx *ctx = HMAC_SHA1_CTX(desc);
ctx->ostate = HMAC_SHA1_KEY(desc->tfm)->ostate;
return __crypto_sha1_import(&ctx->sha_ctx, in);
}
static struct shash_alg algs[] = {
{
.base.cra_name = "sha1",
.base.cra_driver_name = "sha1-lib",
.base.cra_priority = 300,
.base.cra_blocksize = SHA1_BLOCK_SIZE,
.base.cra_module = THIS_MODULE,
.digestsize = SHA1_DIGEST_SIZE,
.init = crypto_sha1_init,
.update = crypto_sha1_update,
.final = crypto_sha1_final,
.digest = crypto_sha1_digest,
.export = crypto_sha1_export,
.import = crypto_sha1_import,
.descsize = sizeof(struct sha1_ctx),
.statesize = SHA1_SHASH_STATE_SIZE,
},
{
.base.cra_name = "hmac(sha1)",
.base.cra_driver_name = "hmac-sha1-lib",
.base.cra_priority = 300,
.base.cra_blocksize = SHA1_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct hmac_sha1_key),
.base.cra_module = THIS_MODULE,
.digestsize = SHA1_DIGEST_SIZE,
.setkey = crypto_hmac_sha1_setkey,
.init = crypto_hmac_sha1_init,
.update = crypto_hmac_sha1_update,
.final = crypto_hmac_sha1_final,
.digest = crypto_hmac_sha1_digest,
.export = crypto_hmac_sha1_export,
.import = crypto_hmac_sha1_import,
.descsize = sizeof(struct hmac_sha1_ctx),
.statesize = SHA1_SHASH_STATE_SIZE,
},
};
static int __init crypto_sha1_mod_init(void)
{
return crypto_register_shashes(algs, ARRAY_SIZE(algs));
}
module_init(crypto_sha1_mod_init);
static void __exit crypto_sha1_mod_exit(void)
{
crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
}
module_exit(crypto_sha1_mod_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Crypto API support for SHA-1 and HMAC-SHA1");
MODULE_ALIAS_CRYPTO("sha1");
MODULE_ALIAS_CRYPTO("sha1-lib");
MODULE_ALIAS_CRYPTO("hmac(sha1)");
MODULE_ALIAS_CRYPTO("hmac-sha1-lib");
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