// SPDX-License-Identifier: GPL-2.0-or-later/* * Crypto API support for SHA-224, SHA-256, HMAC-SHA224, and HMAC-SHA256 * * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com> * Copyright 2025 Google LLC */#include <crypto/internal/hash.h>#include <crypto/sha2.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 SHA256_SHASH_STATE_SIZE 105static_assert(offsetof(struct __sha256_ctx, state) == 0);static_assert(offsetof(struct __sha256_ctx, bytecount) == 32);static_assert(offsetof(struct __sha256_ctx, buf) == 40);static_assert(sizeof(struct __sha256_ctx) + 1 == SHA256_SHASH_STATE_SIZE); static int __crypto_sha256_export(const struct __sha256_ctx *ctx0, void *out){	struct __sha256_ctx ctx = *ctx0;	unsigned int partial;	u8 *p = out; 	partial = ctx.bytecount % SHA256_BLOCK_SIZE;	ctx.bytecount -= partial;	memcpy(p, &ctx, sizeof(ctx));	p += sizeof(ctx);	*p = partial;	return 0;} static int __crypto_sha256_import(struct __sha256_ctx *ctx, const void *in){	const u8 *p = in; 	memcpy(ctx, p, sizeof(*ctx));	p += sizeof(*ctx);	ctx->bytecount += *p;	return 0;} static int __crypto_sha256_export_core(const struct __sha256_ctx *ctx,				       void *out){	memcpy(out, ctx, offsetof(struct __sha256_ctx, buf));	return 0;} static int __crypto_sha256_import_core(struct __sha256_ctx *ctx, const void *in){	memcpy(ctx, in, offsetof(struct __sha256_ctx, buf));	return 0;} /* SHA-224 */ const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = {	0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47,	0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2,	0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4,	0x2f};EXPORT_SYMBOL_GPL(sha224_zero_message_hash); #define SHA224_CTX(desc) ((struct sha224_ctx *)shash_desc_ctx(desc)) static int crypto_sha224_init(struct shash_desc *desc){	sha224_init(SHA224_CTX(desc));	return 0;} static int crypto_sha224_update(struct shash_desc *desc,				const u8 *data, unsigned int len){	sha224_update(SHA224_CTX(desc), data, len);	return 0;} static int crypto_sha224_final(struct shash_desc *desc, u8 *out){	sha224_final(SHA224_CTX(desc), out);	return 0;} static int crypto_sha224_digest(struct shash_desc *desc,				const u8 *data, unsigned int len, u8 *out){	sha224(data, len, out);	return 0;} static int crypto_sha224_export(struct shash_desc *desc, void *out){	return __crypto_sha256_export(&SHA224_CTX(desc)->ctx, out);} static int crypto_sha224_import(struct shash_desc *desc, const void *in){	return __crypto_sha256_import(&SHA224_CTX(desc)->ctx, in);} static int crypto_sha224_export_core(struct shash_desc *desc, void *out){	return __crypto_sha256_export_core(&SHA224_CTX(desc)->ctx, out);} static int crypto_sha224_import_core(struct shash_desc *desc, const void *in){	return __crypto_sha256_import_core(&SHA224_CTX(desc)->ctx, in);} /* SHA-256 */ const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {	0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,	0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,	0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,	0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55};EXPORT_SYMBOL_GPL(sha256_zero_message_hash); #define SHA256_CTX(desc) ((struct sha256_ctx *)shash_desc_ctx(desc)) static int crypto_sha256_init(struct shash_desc *desc){	sha256_init(SHA256_CTX(desc));	return 0;} static int crypto_sha256_update(struct shash_desc *desc,				const u8 *data, unsigned int len){	sha256_update(SHA256_CTX(desc), data, len);	return 0;} static int crypto_sha256_final(struct shash_desc *desc, u8 *out){	sha256_final(SHA256_CTX(desc), out);	return 0;} static int crypto_sha256_digest(struct shash_desc *desc,				const u8 *data, unsigned int len, u8 *out){	sha256(data, len, out);	return 0;} static int crypto_sha256_export(struct shash_desc *desc, void *out){	return __crypto_sha256_export(&SHA256_CTX(desc)->ctx, out);} static int crypto_sha256_import(struct shash_desc *desc, const void *in){	return __crypto_sha256_import(&SHA256_CTX(desc)->ctx, in);} static int crypto_sha256_export_core(struct shash_desc *desc, void *out){	return __crypto_sha256_export_core(&SHA256_CTX(desc)->ctx, out);} static int crypto_sha256_import_core(struct shash_desc *desc, const void *in){	return __crypto_sha256_import_core(&SHA256_CTX(desc)->ctx, in);} /* HMAC-SHA224 */ #define HMAC_SHA224_KEY(tfm) ((struct hmac_sha224_key *)crypto_shash_ctx(tfm))#define HMAC_SHA224_CTX(desc) ((struct hmac_sha224_ctx *)shash_desc_ctx(desc)) static int crypto_hmac_sha224_setkey(struct crypto_shash *tfm,				     const u8 *raw_key, unsigned int keylen){	hmac_sha224_preparekey(HMAC_SHA224_KEY(tfm), raw_key, keylen);	return 0;} static int crypto_hmac_sha224_init(struct shash_desc *desc){	hmac_sha224_init(HMAC_SHA224_CTX(desc), HMAC_SHA224_KEY(desc->tfm));	return 0;} static int crypto_hmac_sha224_update(struct shash_desc *desc,				     const u8 *data, unsigned int len){	hmac_sha224_update(HMAC_SHA224_CTX(desc), data, len);	return 0;} static int crypto_hmac_sha224_final(struct shash_desc *desc, u8 *out){	hmac_sha224_final(HMAC_SHA224_CTX(desc), out);	return 0;} static int crypto_hmac_sha224_digest(struct shash_desc *desc,				     const u8 *data, unsigned int len,				     u8 *out){	hmac_sha224(HMAC_SHA224_KEY(desc->tfm), data, len, out);	return 0;} static int crypto_hmac_sha224_export(struct shash_desc *desc, void *out){	return __crypto_sha256_export(&HMAC_SHA224_CTX(desc)->ctx.sha_ctx, out);} static int crypto_hmac_sha224_import(struct shash_desc *desc, const void *in){	struct hmac_sha224_ctx *ctx = HMAC_SHA224_CTX(desc); 	ctx->ctx.ostate = HMAC_SHA224_KEY(desc->tfm)->key.ostate;	return __crypto_sha256_import(&ctx->ctx.sha_ctx, in);} static int crypto_hmac_sha224_export_core(struct shash_desc *desc, void *out){	return __crypto_sha256_export_core(&HMAC_SHA224_CTX(desc)->ctx.sha_ctx,					   out);} static int crypto_hmac_sha224_import_core(struct shash_desc *desc,					  const void *in){	struct hmac_sha224_ctx *ctx = HMAC_SHA224_CTX(desc); 	ctx->ctx.ostate = HMAC_SHA224_KEY(desc->tfm)->key.ostate;	return __crypto_sha256_import_core(&ctx->ctx.sha_ctx, in);} /* HMAC-SHA256 */ #define HMAC_SHA256_KEY(tfm) ((struct hmac_sha256_key *)crypto_shash_ctx(tfm))#define HMAC_SHA256_CTX(desc) ((struct hmac_sha256_ctx *)shash_desc_ctx(desc)) static int crypto_hmac_sha256_setkey(struct crypto_shash *tfm,				     const u8 *raw_key, unsigned int keylen){	hmac_sha256_preparekey(HMAC_SHA256_KEY(tfm), raw_key, keylen);	return 0;} static int crypto_hmac_sha256_init(struct shash_desc *desc){	hmac_sha256_init(HMAC_SHA256_CTX(desc), HMAC_SHA256_KEY(desc->tfm));	return 0;} static int crypto_hmac_sha256_update(struct shash_desc *desc,				     const u8 *data, unsigned int len){	hmac_sha256_update(HMAC_SHA256_CTX(desc), data, len);	return 0;} static int crypto_hmac_sha256_final(struct shash_desc *desc, u8 *out){	hmac_sha256_final(HMAC_SHA256_CTX(desc), out);	return 0;} static int crypto_hmac_sha256_digest(struct shash_desc *desc,				     const u8 *data, unsigned int len,				     u8 *out){	hmac_sha256(HMAC_SHA256_KEY(desc->tfm), data, len, out);	return 0;} static int crypto_hmac_sha256_export(struct shash_desc *desc, void *out){	return __crypto_sha256_export(&HMAC_SHA256_CTX(desc)->ctx.sha_ctx, out);} static int crypto_hmac_sha256_import(struct shash_desc *desc, const void *in){	struct hmac_sha256_ctx *ctx = HMAC_SHA256_CTX(desc); 	ctx->ctx.ostate = HMAC_SHA256_KEY(desc->tfm)->key.ostate;	return __crypto_sha256_import(&ctx->ctx.sha_ctx, in);} static int crypto_hmac_sha256_export_core(struct shash_desc *desc, void *out){	return __crypto_sha256_export_core(&HMAC_SHA256_CTX(desc)->ctx.sha_ctx,					   out);} static int crypto_hmac_sha256_import_core(struct shash_desc *desc,					  const void *in){	struct hmac_sha256_ctx *ctx = HMAC_SHA256_CTX(desc); 	ctx->ctx.ostate = HMAC_SHA256_KEY(desc->tfm)->key.ostate;	return __crypto_sha256_import_core(&ctx->ctx.sha_ctx, in);} /* Algorithm definitions */ static struct shash_alg algs[] = {	{		.base.cra_name		= "sha224",		.base.cra_driver_name	= "sha224-lib",		.base.cra_priority	= 300,		.base.cra_blocksize	= SHA224_BLOCK_SIZE,		.base.cra_module	= THIS_MODULE,		.digestsize		= SHA224_DIGEST_SIZE,		.init			= crypto_sha224_init,		.update			= crypto_sha224_update,		.final			= crypto_sha224_final,		.digest			= crypto_sha224_digest,		.export			= crypto_sha224_export,		.import			= crypto_sha224_import,		.export_core		= crypto_sha224_export_core,		.import_core		= crypto_sha224_import_core,		.descsize		= sizeof(struct sha224_ctx),		.statesize		= SHA256_SHASH_STATE_SIZE,	},	{		.base.cra_name		= "sha256",		.base.cra_driver_name	= "sha256-lib",		.base.cra_priority	= 300,		.base.cra_blocksize	= SHA256_BLOCK_SIZE,		.base.cra_module	= THIS_MODULE,		.digestsize		= SHA256_DIGEST_SIZE,		.init			= crypto_sha256_init,		.update			= crypto_sha256_update,		.final			= crypto_sha256_final,		.digest			= crypto_sha256_digest,		.export			= crypto_sha256_export,		.import			= crypto_sha256_import,		.export_core		= crypto_sha256_export_core,		.import_core		= crypto_sha256_import_core,		.descsize		= sizeof(struct sha256_ctx),		.statesize		= SHA256_SHASH_STATE_SIZE,	},	{		.base.cra_name		= "hmac(sha224)",		.base.cra_driver_name	= "hmac-sha224-lib",		.base.cra_priority	= 300,		.base.cra_blocksize	= SHA224_BLOCK_SIZE,		.base.cra_ctxsize	= sizeof(struct hmac_sha224_key),		.base.cra_module	= THIS_MODULE,		.digestsize		= SHA224_DIGEST_SIZE,		.setkey			= crypto_hmac_sha224_setkey,		.init			= crypto_hmac_sha224_init,		.update			= crypto_hmac_sha224_update,		.final			= crypto_hmac_sha224_final,		.digest			= crypto_hmac_sha224_digest,		.export			= crypto_hmac_sha224_export,		.import			= crypto_hmac_sha224_import,		.export_core		= crypto_hmac_sha224_export_core,		.import_core		= crypto_hmac_sha224_import_core,		.descsize		= sizeof(struct hmac_sha224_ctx),		.statesize		= SHA256_SHASH_STATE_SIZE,	},	{		.base.cra_name		= "hmac(sha256)",		.base.cra_driver_name	= "hmac-sha256-lib",		.base.cra_priority	= 300,		.base.cra_blocksize	= SHA256_BLOCK_SIZE,		.base.cra_ctxsize	= sizeof(struct hmac_sha256_key),		.base.cra_module	= THIS_MODULE,		.digestsize		= SHA256_DIGEST_SIZE,		.setkey			= crypto_hmac_sha256_setkey,		.init			= crypto_hmac_sha256_init,		.update			= crypto_hmac_sha256_update,		.final			= crypto_hmac_sha256_final,		.digest			= crypto_hmac_sha256_digest,		.export			= crypto_hmac_sha256_export,		.import			= crypto_hmac_sha256_import,		.export_core		= crypto_hmac_sha256_export_core,		.import_core		= crypto_hmac_sha256_import_core,		.descsize		= sizeof(struct hmac_sha256_ctx),		.statesize		= SHA256_SHASH_STATE_SIZE,	},}; static int __init crypto_sha256_mod_init(void){	return crypto_register_shashes(algs, ARRAY_SIZE(algs));}module_init(crypto_sha256_mod_init); static void __exit crypto_sha256_mod_exit(void){	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));}module_exit(crypto_sha256_mod_exit); MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Crypto API support for SHA-224, SHA-256, HMAC-SHA224, and HMAC-SHA256"); MODULE_ALIAS_CRYPTO("sha224");MODULE_ALIAS_CRYPTO("sha224-lib");MODULE_ALIAS_CRYPTO("sha256");MODULE_ALIAS_CRYPTO("sha256-lib");MODULE_ALIAS_CRYPTO("hmac(sha224)");MODULE_ALIAS_CRYPTO("hmac-sha224-lib");MODULE_ALIAS_CRYPTO("hmac(sha256)");MODULE_ALIAS_CRYPTO("hmac-sha256-lib");