Date: Mon, 9 Nov 2020 14:15:06 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r367524 - stable/12/sys/opencrypto Message-ID: <202011091415.0A9EF6kt087538@repo.freebsd.org>
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Author: markj Date: Mon Nov 9 14:15:06 2020 New Revision: 367524 URL: https://svnweb.freebsd.org/changeset/base/367524 Log: Add hmac_init_ipad() and hmac_init_opad() This is a merge of a small portion of r359374 which makes it easier to maintain OpenCrypto drivers in stable/12. No functional change intended; this is a direct commit to stable/12. Discussed with: jhb Modified: stable/12/sys/opencrypto/crypto.c stable/12/sys/opencrypto/cryptodev.h Modified: stable/12/sys/opencrypto/crypto.c ============================================================================== --- stable/12/sys/opencrypto/crypto.c Mon Nov 9 13:54:29 2020 (r367523) +++ stable/12/sys/opencrypto/crypto.c Mon Nov 9 14:15:06 2020 (r367524) @@ -380,6 +380,53 @@ crypto_terminate(struct proc **pp, void *q) } static void +hmac_init_pad(const struct auth_hash *axf, const char *key, int klen, + void *auth_ctx, uint8_t padval) +{ + uint8_t hmac_key[HMAC_MAX_BLOCK_LEN]; + u_int i; + + KASSERT(axf->blocksize <= sizeof(hmac_key), + ("Invalid HMAC block size %d", axf->blocksize)); + + /* + * If the key is larger than the block size, use the digest of + * the key as the key instead. + */ + memset(hmac_key, 0, sizeof(hmac_key)); + if (klen > axf->blocksize) { + axf->Init(auth_ctx); + axf->Update(auth_ctx, key, klen); + axf->Final(hmac_key, auth_ctx); + klen = axf->hashsize; + } else + memcpy(hmac_key, key, klen); + + for (i = 0; i < axf->blocksize; i++) + hmac_key[i] ^= padval; + + axf->Init(auth_ctx); + axf->Update(auth_ctx, hmac_key, axf->blocksize); + explicit_bzero(hmac_key, sizeof(hmac_key)); +} + +void +hmac_init_ipad(const struct auth_hash *axf, const char *key, int klen, + void *auth_ctx) +{ + + hmac_init_pad(axf, key, klen, auth_ctx, HMAC_IPAD_VAL); +} + +void +hmac_init_opad(const struct auth_hash *axf, const char *key, int klen, + void *auth_ctx) +{ + + hmac_init_pad(axf, key, klen, auth_ctx, HMAC_OPAD_VAL); +} + +static void crypto_destroy(void) { struct crypto_ret_worker *ret_worker; Modified: stable/12/sys/opencrypto/cryptodev.h ============================================================================== --- stable/12/sys/opencrypto/cryptodev.h Mon Nov 9 13:54:29 2020 (r367523) +++ stable/12/sys/opencrypto/cryptodev.h Mon Nov 9 14:15:06 2020 (r367524) @@ -546,6 +546,14 @@ extern int crypto_usercrypto; /* userland may do cryp extern int crypto_userasymcrypto; /* userland may do asym crypto reqs */ extern int crypto_devallowsoft; /* only use hardware crypto */ +/* Helper routines for drivers to initialize auth contexts for HMAC. */ +struct auth_hash; + +void hmac_init_ipad(const struct auth_hash *axf, const char *key, int klen, + void *auth_ctx); +void hmac_init_opad(const struct auth_hash *axf, const char *key, int klen, + void *auth_ctx); + /* * Crypto-related utility routines used mainly by drivers. *
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