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07f090959b
Make the export and import functions for the sha224, sha256, hmac(sha224), and hmac(sha256) shash algorithms use the same format as the padlock-sha and nx-sha256 drivers, as required by Herbert. Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250630160645.3198-11-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
348 lines
9.7 KiB
C
348 lines
9.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Crypto API support for SHA-224, SHA-256, HMAC-SHA224, and HMAC-SHA256
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*
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* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
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* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
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* Copyright 2025 Google LLC
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*/
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#include <crypto/internal/hash.h>
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#include <crypto/sha2.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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/*
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* Export and import functions. crypto_shash wants a particular format that
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* matches that used by some legacy drivers. It currently is the same as the
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* library SHA context, except the value in bytecount must be block-aligned and
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* the remainder must be stored in an extra u8 appended to the struct.
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*/
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#define SHA256_SHASH_STATE_SIZE 105
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static_assert(offsetof(struct __sha256_ctx, state) == 0);
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static_assert(offsetof(struct __sha256_ctx, bytecount) == 32);
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static_assert(offsetof(struct __sha256_ctx, buf) == 40);
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static_assert(sizeof(struct __sha256_ctx) + 1 == SHA256_SHASH_STATE_SIZE);
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static int __crypto_sha256_export(const struct __sha256_ctx *ctx0, void *out)
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{
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struct __sha256_ctx ctx = *ctx0;
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unsigned int partial;
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u8 *p = out;
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partial = ctx.bytecount % SHA256_BLOCK_SIZE;
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ctx.bytecount -= partial;
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memcpy(p, &ctx, sizeof(ctx));
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p += sizeof(ctx);
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*p = partial;
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return 0;
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}
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static int __crypto_sha256_import(struct __sha256_ctx *ctx, const void *in)
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{
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const u8 *p = in;
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memcpy(ctx, p, sizeof(*ctx));
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p += sizeof(*ctx);
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ctx->bytecount += *p;
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return 0;
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}
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/* SHA-224 */
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const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = {
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0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47,
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0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2,
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0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4,
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0x2f
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};
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EXPORT_SYMBOL_GPL(sha224_zero_message_hash);
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#define SHA224_CTX(desc) ((struct sha224_ctx *)shash_desc_ctx(desc))
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static int crypto_sha224_init(struct shash_desc *desc)
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{
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sha224_init(SHA224_CTX(desc));
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return 0;
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}
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static int crypto_sha224_update(struct shash_desc *desc,
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const u8 *data, unsigned int len)
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{
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sha224_update(SHA224_CTX(desc), data, len);
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return 0;
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}
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static int crypto_sha224_final(struct shash_desc *desc, u8 *out)
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{
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sha224_final(SHA224_CTX(desc), out);
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return 0;
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}
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static int crypto_sha224_digest(struct shash_desc *desc,
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const u8 *data, unsigned int len, u8 *out)
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{
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sha224(data, len, out);
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return 0;
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}
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static int crypto_sha224_export(struct shash_desc *desc, void *out)
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{
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return __crypto_sha256_export(&SHA224_CTX(desc)->ctx, out);
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}
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static int crypto_sha224_import(struct shash_desc *desc, const void *in)
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{
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return __crypto_sha256_import(&SHA224_CTX(desc)->ctx, in);
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}
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/* SHA-256 */
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const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {
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0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
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0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
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0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
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0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55
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};
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EXPORT_SYMBOL_GPL(sha256_zero_message_hash);
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#define SHA256_CTX(desc) ((struct sha256_ctx *)shash_desc_ctx(desc))
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static int crypto_sha256_init(struct shash_desc *desc)
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{
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sha256_init(SHA256_CTX(desc));
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return 0;
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}
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static int crypto_sha256_update(struct shash_desc *desc,
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const u8 *data, unsigned int len)
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{
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sha256_update(SHA256_CTX(desc), data, len);
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return 0;
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}
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static int crypto_sha256_final(struct shash_desc *desc, u8 *out)
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{
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sha256_final(SHA256_CTX(desc), out);
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return 0;
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}
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static int crypto_sha256_digest(struct shash_desc *desc,
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const u8 *data, unsigned int len, u8 *out)
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{
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sha256(data, len, out);
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return 0;
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}
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static int crypto_sha256_export(struct shash_desc *desc, void *out)
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{
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return __crypto_sha256_export(&SHA256_CTX(desc)->ctx, out);
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}
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static int crypto_sha256_import(struct shash_desc *desc, const void *in)
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{
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return __crypto_sha256_import(&SHA256_CTX(desc)->ctx, in);
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}
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/* HMAC-SHA224 */
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#define HMAC_SHA224_KEY(tfm) ((struct hmac_sha224_key *)crypto_shash_ctx(tfm))
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#define HMAC_SHA224_CTX(desc) ((struct hmac_sha224_ctx *)shash_desc_ctx(desc))
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static int crypto_hmac_sha224_setkey(struct crypto_shash *tfm,
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const u8 *raw_key, unsigned int keylen)
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{
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hmac_sha224_preparekey(HMAC_SHA224_KEY(tfm), raw_key, keylen);
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return 0;
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}
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static int crypto_hmac_sha224_init(struct shash_desc *desc)
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{
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hmac_sha224_init(HMAC_SHA224_CTX(desc), HMAC_SHA224_KEY(desc->tfm));
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return 0;
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}
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static int crypto_hmac_sha224_update(struct shash_desc *desc,
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const u8 *data, unsigned int len)
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{
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hmac_sha224_update(HMAC_SHA224_CTX(desc), data, len);
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return 0;
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}
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static int crypto_hmac_sha224_final(struct shash_desc *desc, u8 *out)
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{
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hmac_sha224_final(HMAC_SHA224_CTX(desc), out);
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return 0;
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}
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static int crypto_hmac_sha224_digest(struct shash_desc *desc,
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const u8 *data, unsigned int len,
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u8 *out)
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{
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hmac_sha224(HMAC_SHA224_KEY(desc->tfm), data, len, out);
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return 0;
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}
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static int crypto_hmac_sha224_export(struct shash_desc *desc, void *out)
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{
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return __crypto_sha256_export(&HMAC_SHA224_CTX(desc)->ctx.sha_ctx, out);
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}
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static int crypto_hmac_sha224_import(struct shash_desc *desc, const void *in)
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{
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struct hmac_sha224_ctx *ctx = HMAC_SHA224_CTX(desc);
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ctx->ctx.ostate = HMAC_SHA224_KEY(desc->tfm)->key.ostate;
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return __crypto_sha256_import(&ctx->ctx.sha_ctx, in);
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}
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/* HMAC-SHA256 */
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#define HMAC_SHA256_KEY(tfm) ((struct hmac_sha256_key *)crypto_shash_ctx(tfm))
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#define HMAC_SHA256_CTX(desc) ((struct hmac_sha256_ctx *)shash_desc_ctx(desc))
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static int crypto_hmac_sha256_setkey(struct crypto_shash *tfm,
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const u8 *raw_key, unsigned int keylen)
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{
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hmac_sha256_preparekey(HMAC_SHA256_KEY(tfm), raw_key, keylen);
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return 0;
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}
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static int crypto_hmac_sha256_init(struct shash_desc *desc)
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{
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hmac_sha256_init(HMAC_SHA256_CTX(desc), HMAC_SHA256_KEY(desc->tfm));
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return 0;
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}
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static int crypto_hmac_sha256_update(struct shash_desc *desc,
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const u8 *data, unsigned int len)
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{
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hmac_sha256_update(HMAC_SHA256_CTX(desc), data, len);
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return 0;
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}
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static int crypto_hmac_sha256_final(struct shash_desc *desc, u8 *out)
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{
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hmac_sha256_final(HMAC_SHA256_CTX(desc), out);
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return 0;
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}
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static int crypto_hmac_sha256_digest(struct shash_desc *desc,
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const u8 *data, unsigned int len,
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u8 *out)
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{
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hmac_sha256(HMAC_SHA256_KEY(desc->tfm), data, len, out);
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return 0;
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}
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static int crypto_hmac_sha256_export(struct shash_desc *desc, void *out)
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{
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return __crypto_sha256_export(&HMAC_SHA256_CTX(desc)->ctx.sha_ctx, out);
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}
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static int crypto_hmac_sha256_import(struct shash_desc *desc, const void *in)
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{
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struct hmac_sha256_ctx *ctx = HMAC_SHA256_CTX(desc);
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ctx->ctx.ostate = HMAC_SHA256_KEY(desc->tfm)->key.ostate;
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return __crypto_sha256_import(&ctx->ctx.sha_ctx, in);
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}
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/* Algorithm definitions */
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static struct shash_alg algs[] = {
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{
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.base.cra_name = "sha224",
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.base.cra_driver_name = "sha224-lib",
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.base.cra_priority = 300,
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.base.cra_blocksize = SHA224_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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.digestsize = SHA224_DIGEST_SIZE,
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.init = crypto_sha224_init,
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.update = crypto_sha224_update,
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.final = crypto_sha224_final,
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.digest = crypto_sha224_digest,
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.export = crypto_sha224_export,
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.import = crypto_sha224_import,
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.descsize = sizeof(struct sha224_ctx),
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.statesize = SHA256_SHASH_STATE_SIZE,
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},
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{
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.base.cra_name = "sha256",
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.base.cra_driver_name = "sha256-lib",
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.base.cra_priority = 300,
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.base.cra_blocksize = SHA256_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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.digestsize = SHA256_DIGEST_SIZE,
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.init = crypto_sha256_init,
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.update = crypto_sha256_update,
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.final = crypto_sha256_final,
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.digest = crypto_sha256_digest,
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.export = crypto_sha256_export,
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.import = crypto_sha256_import,
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.descsize = sizeof(struct sha256_ctx),
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.statesize = SHA256_SHASH_STATE_SIZE,
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},
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{
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.base.cra_name = "hmac(sha224)",
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.base.cra_driver_name = "hmac-sha224-lib",
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.base.cra_priority = 300,
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.base.cra_blocksize = SHA224_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct hmac_sha224_key),
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.base.cra_module = THIS_MODULE,
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.digestsize = SHA224_DIGEST_SIZE,
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.setkey = crypto_hmac_sha224_setkey,
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.init = crypto_hmac_sha224_init,
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.update = crypto_hmac_sha224_update,
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.final = crypto_hmac_sha224_final,
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.digest = crypto_hmac_sha224_digest,
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.export = crypto_hmac_sha224_export,
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.import = crypto_hmac_sha224_import,
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.descsize = sizeof(struct hmac_sha224_ctx),
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.statesize = SHA256_SHASH_STATE_SIZE,
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},
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{
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.base.cra_name = "hmac(sha256)",
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.base.cra_driver_name = "hmac-sha256-lib",
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.base.cra_priority = 300,
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.base.cra_blocksize = SHA256_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct hmac_sha256_key),
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.base.cra_module = THIS_MODULE,
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.digestsize = SHA256_DIGEST_SIZE,
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.setkey = crypto_hmac_sha256_setkey,
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.init = crypto_hmac_sha256_init,
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.update = crypto_hmac_sha256_update,
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.final = crypto_hmac_sha256_final,
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.digest = crypto_hmac_sha256_digest,
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.export = crypto_hmac_sha256_export,
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.import = crypto_hmac_sha256_import,
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.descsize = sizeof(struct hmac_sha256_ctx),
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.statesize = SHA256_SHASH_STATE_SIZE,
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},
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};
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static int __init crypto_sha256_mod_init(void)
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{
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return crypto_register_shashes(algs, ARRAY_SIZE(algs));
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}
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module_init(crypto_sha256_mod_init);
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static void __exit crypto_sha256_mod_exit(void)
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{
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crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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}
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module_exit(crypto_sha256_mod_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Crypto API support for SHA-224, SHA-256, HMAC-SHA224, and HMAC-SHA256");
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MODULE_ALIAS_CRYPTO("sha224");
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MODULE_ALIAS_CRYPTO("sha224-lib");
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MODULE_ALIAS_CRYPTO("sha256");
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MODULE_ALIAS_CRYPTO("sha256-lib");
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MODULE_ALIAS_CRYPTO("hmac(sha224)");
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MODULE_ALIAS_CRYPTO("hmac-sha224-lib");
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MODULE_ALIAS_CRYPTO("hmac(sha256)");
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MODULE_ALIAS_CRYPTO("hmac-sha256-lib");
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