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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237// SPDX-License-Identifier: GPL-2.0-or-later/* * Crypto API support for MD5 and HMAC-MD5 * * Copyright 2025 Google LLC */#include <crypto/internal/hash.h>#include <crypto/md5.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 MD5 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 MD5_SHASH_STATE_SIZE (sizeof(struct md5_ctx) + 1)static_assert(sizeof(struct md5_ctx) == sizeof(struct md5_state));static_assert(offsetof(struct md5_ctx, state) == offsetof(struct md5_state, hash));static_assert(offsetof(struct md5_ctx, bytecount) == offsetof(struct md5_state, byte_count));static_assert(offsetof(struct md5_ctx, buf) == offsetof(struct md5_state, block));
static int __crypto_md5_export(const struct md5_ctx *ctx0, void *out){ struct md5_ctx ctx = *ctx0; unsigned int partial; u8 *p = out;
partial = ctx.bytecount % MD5_BLOCK_SIZE; ctx.bytecount -= partial; memcpy(p, &ctx, sizeof(ctx)); p += sizeof(ctx); *p = partial; return 0;}
static int __crypto_md5_import(struct md5_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_md5_export_core(const struct md5_ctx *ctx, void *out){ memcpy(out, ctx, offsetof(struct md5_ctx, buf)); return 0;}
static int __crypto_md5_import_core(struct md5_ctx *ctx, const void *in){ memcpy(ctx, in, offsetof(struct md5_ctx, buf)); return 0;}
const u8 md5_zero_message_hash[MD5_DIGEST_SIZE] = { 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04, 0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e,};EXPORT_SYMBOL_GPL(md5_zero_message_hash);
#define MD5_CTX(desc) ((struct md5_ctx *)shash_desc_ctx(desc))
static int crypto_md5_init(struct shash_desc *desc){ md5_init(MD5_CTX(desc)); return 0;}
static int crypto_md5_update(struct shash_desc *desc, const u8 *data, unsigned int len){ md5_update(MD5_CTX(desc), data, len); return 0;}
static int crypto_md5_final(struct shash_desc *desc, u8 *out){ md5_final(MD5_CTX(desc), out); return 0;}
static int crypto_md5_digest(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out){ md5(data, len, out); return 0;}
static int crypto_md5_export(struct shash_desc *desc, void *out){ return __crypto_md5_export(MD5_CTX(desc), out);}
static int crypto_md5_import(struct shash_desc *desc, const void *in){ return __crypto_md5_import(MD5_CTX(desc), in);}
static int crypto_md5_export_core(struct shash_desc *desc, void *out){ return __crypto_md5_export_core(MD5_CTX(desc), out);}
static int crypto_md5_import_core(struct shash_desc *desc, const void *in){ return __crypto_md5_import_core(MD5_CTX(desc), in);}
#define HMAC_MD5_KEY(tfm) ((struct hmac_md5_key *)crypto_shash_ctx(tfm))#define HMAC_MD5_CTX(desc) ((struct hmac_md5_ctx *)shash_desc_ctx(desc))
static int crypto_hmac_md5_setkey(struct crypto_shash *tfm, const u8 *raw_key, unsigned int keylen){ hmac_md5_preparekey(HMAC_MD5_KEY(tfm), raw_key, keylen); return 0;}
static int crypto_hmac_md5_init(struct shash_desc *desc){ hmac_md5_init(HMAC_MD5_CTX(desc), HMAC_MD5_KEY(desc->tfm)); return 0;}
static int crypto_hmac_md5_update(struct shash_desc *desc, const u8 *data, unsigned int len){ hmac_md5_update(HMAC_MD5_CTX(desc), data, len); return 0;}
static int crypto_hmac_md5_final(struct shash_desc *desc, u8 *out){ hmac_md5_final(HMAC_MD5_CTX(desc), out); return 0;}
static int crypto_hmac_md5_digest(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out){ hmac_md5(HMAC_MD5_KEY(desc->tfm), data, len, out); return 0;}
static int crypto_hmac_md5_export(struct shash_desc *desc, void *out){ return __crypto_md5_export(&HMAC_MD5_CTX(desc)->hash_ctx, out);}
static int crypto_hmac_md5_import(struct shash_desc *desc, const void *in){ struct hmac_md5_ctx *ctx = HMAC_MD5_CTX(desc);
ctx->ostate = HMAC_MD5_KEY(desc->tfm)->ostate; return __crypto_md5_import(&ctx->hash_ctx, in);}
static int crypto_hmac_md5_export_core(struct shash_desc *desc, void *out){ return __crypto_md5_export_core(&HMAC_MD5_CTX(desc)->hash_ctx, out);}
static int crypto_hmac_md5_import_core(struct shash_desc *desc, const void *in){ struct hmac_md5_ctx *ctx = HMAC_MD5_CTX(desc);
ctx->ostate = HMAC_MD5_KEY(desc->tfm)->ostate; return __crypto_md5_import_core(&ctx->hash_ctx, in);}
static struct shash_alg algs[] = { { .base.cra_name = "md5", .base.cra_driver_name = "md5-lib", .base.cra_priority = 300, .base.cra_blocksize = MD5_BLOCK_SIZE, .base.cra_module = THIS_MODULE, .digestsize = MD5_DIGEST_SIZE, .init = crypto_md5_init, .update = crypto_md5_update, .final = crypto_md5_final, .digest = crypto_md5_digest, .export = crypto_md5_export, .import = crypto_md5_import, .export_core = crypto_md5_export_core, .import_core = crypto_md5_import_core, .descsize = sizeof(struct md5_ctx), .statesize = MD5_SHASH_STATE_SIZE, }, { .base.cra_name = "hmac(md5)", .base.cra_driver_name = "hmac-md5-lib", .base.cra_priority = 300, .base.cra_blocksize = MD5_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct hmac_md5_key), .base.cra_module = THIS_MODULE, .digestsize = MD5_DIGEST_SIZE, .setkey = crypto_hmac_md5_setkey, .init = crypto_hmac_md5_init, .update = crypto_hmac_md5_update, .final = crypto_hmac_md5_final, .digest = crypto_hmac_md5_digest, .export = crypto_hmac_md5_export, .import = crypto_hmac_md5_import, .export_core = crypto_hmac_md5_export_core, .import_core = crypto_hmac_md5_import_core, .descsize = sizeof(struct hmac_md5_ctx), .statesize = MD5_SHASH_STATE_SIZE, },};
static int __init crypto_md5_mod_init(void){ return crypto_register_shashes(algs, ARRAY_SIZE(algs));}module_init(crypto_md5_mod_init);
static void __exit crypto_md5_mod_exit(void){ crypto_unregister_shashes(algs, ARRAY_SIZE(algs));}module_exit(crypto_md5_mod_exit);
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Crypto API support for MD5 and HMAC-MD5");
MODULE_ALIAS_CRYPTO("md5");MODULE_ALIAS_CRYPTO("md5-lib");MODULE_ALIAS_CRYPTO("hmac(md5)");MODULE_ALIAS_CRYPTO("hmac-md5-lib");