diff options
Diffstat (limited to 'crypto/sha1.c')
| -rw-r--r-- | crypto/sha1.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/crypto/sha1.c b/crypto/sha1.c new file mode 100644 index 000000000000..ecef4bf2d9c0 --- /dev/null +++ b/crypto/sha1.c @@ -0,0 +1,201 @@ +// 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"); |