From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- crypto/hmac.c | 263 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 263 insertions(+) create mode 100644 crypto/hmac.c (limited to 'crypto/hmac.c') diff --git a/crypto/hmac.c b/crypto/hmac.c new file mode 100644 index 000000000..3610ff0b6 --- /dev/null +++ b/crypto/hmac.c @@ -0,0 +1,263 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Cryptographic API. + * + * HMAC: Keyed-Hashing for Message Authentication (RFC2104). + * + * Copyright (c) 2002 James Morris + * Copyright (c) 2006 Herbert Xu + * + * The HMAC implementation is derived from USAGI. + * Copyright (c) 2002 Kazunori Miyazawa / USAGI + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct hmac_ctx { + struct crypto_shash *hash; +}; + +static inline void *align_ptr(void *p, unsigned int align) +{ + return (void *)ALIGN((unsigned long)p, align); +} + +static inline struct hmac_ctx *hmac_ctx(struct crypto_shash *tfm) +{ + return align_ptr(crypto_shash_ctx_aligned(tfm) + + crypto_shash_statesize(tfm) * 2, + crypto_tfm_ctx_alignment()); +} + +static int hmac_setkey(struct crypto_shash *parent, + const u8 *inkey, unsigned int keylen) +{ + int bs = crypto_shash_blocksize(parent); + int ds = crypto_shash_digestsize(parent); + int ss = crypto_shash_statesize(parent); + char *ipad = crypto_shash_ctx_aligned(parent); + char *opad = ipad + ss; + struct hmac_ctx *ctx = align_ptr(opad + ss, + crypto_tfm_ctx_alignment()); + struct crypto_shash *hash = ctx->hash; + SHASH_DESC_ON_STACK(shash, hash); + unsigned int i; + + if (fips_enabled && (keylen < 112 / 8)) + return -EINVAL; + + shash->tfm = hash; + + if (keylen > bs) { + int err; + + err = crypto_shash_digest(shash, inkey, keylen, ipad); + if (err) + return err; + + keylen = ds; + } else + memcpy(ipad, inkey, keylen); + + memset(ipad + keylen, 0, bs - keylen); + memcpy(opad, ipad, bs); + + for (i = 0; i < bs; i++) { + ipad[i] ^= HMAC_IPAD_VALUE; + opad[i] ^= HMAC_OPAD_VALUE; + } + + return crypto_shash_init(shash) ?: + crypto_shash_update(shash, ipad, bs) ?: + crypto_shash_export(shash, ipad) ?: + crypto_shash_init(shash) ?: + crypto_shash_update(shash, opad, bs) ?: + crypto_shash_export(shash, opad); +} + +static int hmac_export(struct shash_desc *pdesc, void *out) +{ + struct shash_desc *desc = shash_desc_ctx(pdesc); + + return crypto_shash_export(desc, out); +} + +static int hmac_import(struct shash_desc *pdesc, const void *in) +{ + struct shash_desc *desc = shash_desc_ctx(pdesc); + struct hmac_ctx *ctx = hmac_ctx(pdesc->tfm); + + desc->tfm = ctx->hash; + + return crypto_shash_import(desc, in); +} + +static int hmac_init(struct shash_desc *pdesc) +{ + return hmac_import(pdesc, crypto_shash_ctx_aligned(pdesc->tfm)); +} + +static int hmac_update(struct shash_desc *pdesc, + const u8 *data, unsigned int nbytes) +{ + struct shash_desc *desc = shash_desc_ctx(pdesc); + + return crypto_shash_update(desc, data, nbytes); +} + +static int hmac_final(struct shash_desc *pdesc, u8 *out) +{ + struct crypto_shash *parent = pdesc->tfm; + int ds = crypto_shash_digestsize(parent); + int ss = crypto_shash_statesize(parent); + char *opad = crypto_shash_ctx_aligned(parent) + ss; + struct shash_desc *desc = shash_desc_ctx(pdesc); + + return crypto_shash_final(desc, out) ?: + crypto_shash_import(desc, opad) ?: + crypto_shash_finup(desc, out, ds, out); +} + +static int hmac_finup(struct shash_desc *pdesc, const u8 *data, + unsigned int nbytes, u8 *out) +{ + + struct crypto_shash *parent = pdesc->tfm; + int ds = crypto_shash_digestsize(parent); + int ss = crypto_shash_statesize(parent); + char *opad = crypto_shash_ctx_aligned(parent) + ss; + struct shash_desc *desc = shash_desc_ctx(pdesc); + + return crypto_shash_finup(desc, data, nbytes, out) ?: + crypto_shash_import(desc, opad) ?: + crypto_shash_finup(desc, out, ds, out); +} + +static int hmac_init_tfm(struct crypto_shash *parent) +{ + struct crypto_shash *hash; + struct shash_instance *inst = shash_alg_instance(parent); + struct crypto_shash_spawn *spawn = shash_instance_ctx(inst); + struct hmac_ctx *ctx = hmac_ctx(parent); + + hash = crypto_spawn_shash(spawn); + if (IS_ERR(hash)) + return PTR_ERR(hash); + + parent->descsize = sizeof(struct shash_desc) + + crypto_shash_descsize(hash); + + ctx->hash = hash; + return 0; +} + +static void hmac_exit_tfm(struct crypto_shash *parent) +{ + struct hmac_ctx *ctx = hmac_ctx(parent); + crypto_free_shash(ctx->hash); +} + +static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb) +{ + struct shash_instance *inst; + struct crypto_shash_spawn *spawn; + struct crypto_alg *alg; + struct shash_alg *salg; + u32 mask; + int err; + int ds; + int ss; + + err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask); + if (err) + return err; + + inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); + if (!inst) + return -ENOMEM; + spawn = shash_instance_ctx(inst); + + err = crypto_grab_shash(spawn, shash_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), 0, mask); + if (err) + goto err_free_inst; + salg = crypto_spawn_shash_alg(spawn); + alg = &salg->base; + + /* The underlying hash algorithm must not require a key */ + err = -EINVAL; + if (crypto_shash_alg_needs_key(salg)) + goto err_free_inst; + + ds = salg->digestsize; + ss = salg->statesize; + if (ds > alg->cra_blocksize || + ss < alg->cra_blocksize) + goto err_free_inst; + + err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg); + if (err) + goto err_free_inst; + + inst->alg.base.cra_priority = alg->cra_priority; + inst->alg.base.cra_blocksize = alg->cra_blocksize; + inst->alg.base.cra_alignmask = alg->cra_alignmask; + + ss = ALIGN(ss, alg->cra_alignmask + 1); + inst->alg.digestsize = ds; + inst->alg.statesize = ss; + + inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) + + ALIGN(ss * 2, crypto_tfm_ctx_alignment()); + + inst->alg.init = hmac_init; + inst->alg.update = hmac_update; + inst->alg.final = hmac_final; + inst->alg.finup = hmac_finup; + inst->alg.export = hmac_export; + inst->alg.import = hmac_import; + inst->alg.setkey = hmac_setkey; + inst->alg.init_tfm = hmac_init_tfm; + inst->alg.exit_tfm = hmac_exit_tfm; + + inst->free = shash_free_singlespawn_instance; + + err = shash_register_instance(tmpl, inst); + if (err) { +err_free_inst: + shash_free_singlespawn_instance(inst); + } + return err; +} + +static struct crypto_template hmac_tmpl = { + .name = "hmac", + .create = hmac_create, + .module = THIS_MODULE, +}; + +static int __init hmac_module_init(void) +{ + return crypto_register_template(&hmac_tmpl); +} + +static void __exit hmac_module_exit(void) +{ + crypto_unregister_template(&hmac_tmpl); +} + +subsys_initcall(hmac_module_init); +module_exit(hmac_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("HMAC hash algorithm"); +MODULE_ALIAS_CRYPTO("hmac"); -- cgit v1.2.3