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739afd9475
It's the only one actually used Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12901
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/*
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* CDDL HEADER START
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*
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* This file and its contents are supplied under the terms of the
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* Common Development and Distribution License ("CDDL"), version 1.0.
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* You may only use this file in accordance with the terms of version
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* 1.0 of the CDDL.
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*
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* A full copy of the text of the CDDL should have accompanied this
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* source. A copy of the CDDL is also available via the Internet at
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* http://www.illumos.org/license/CDDL.
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2017, Datto, Inc. All rights reserved.
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*/
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#include <sys/dmu.h>
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#include <sys/hkdf.h>
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#include <sys/freebsd_crypto.h>
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#include <sys/hkdf.h>
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static int
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hkdf_sha512_extract(uint8_t *salt, uint_t salt_len, uint8_t *key_material,
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uint_t km_len, uint8_t *out_buf)
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{
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crypto_key_t key;
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/* initialize the salt as a crypto key */
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key.ck_length = CRYPTO_BYTES2BITS(salt_len);
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key.ck_data = salt;
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crypto_mac(&key, key_material, km_len, out_buf, SHA512_DIGEST_LENGTH);
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return (0);
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}
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static int
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hkdf_sha512_expand(uint8_t *extract_key, uint8_t *info, uint_t info_len,
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uint8_t *out_buf, uint_t out_len)
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{
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struct hmac_ctx ctx;
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crypto_key_t key;
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uint_t i, T_len = 0, pos = 0;
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uint8_t c;
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uint_t N = (out_len + SHA512_DIGEST_LENGTH) / SHA512_DIGEST_LENGTH;
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uint8_t T[SHA512_DIGEST_LENGTH];
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if (N > 255)
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return (SET_ERROR(EINVAL));
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/* initialize the salt as a crypto key */
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key.ck_length = CRYPTO_BYTES2BITS(SHA512_DIGEST_LENGTH);
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key.ck_data = extract_key;
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for (i = 1; i <= N; i++) {
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c = i;
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crypto_mac_init(&ctx, &key);
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crypto_mac_update(&ctx, T, T_len);
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crypto_mac_update(&ctx, info, info_len);
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crypto_mac_update(&ctx, &c, 1);
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crypto_mac_final(&ctx, T, SHA512_DIGEST_LENGTH);
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bcopy(T, out_buf + pos,
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(i != N) ? SHA512_DIGEST_LENGTH : (out_len - pos));
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pos += SHA512_DIGEST_LENGTH;
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}
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return (0);
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}
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/*
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* HKDF is designed to be a relatively fast function for deriving keys from a
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* master key + a salt. We use this function to generate new encryption keys
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* so as to avoid hitting the cryptographic limits of the underlying
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* encryption modes. Note that, for the sake of deriving encryption keys, the
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* info parameter is called the "salt" everywhere else in the code.
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*/
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int
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hkdf_sha512(uint8_t *key_material, uint_t km_len, uint8_t *salt,
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uint_t salt_len, uint8_t *info, uint_t info_len, uint8_t *output_key,
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uint_t out_len)
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{
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int ret;
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uint8_t extract_key[SHA512_DIGEST_LENGTH];
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ret = hkdf_sha512_extract(salt, salt_len, key_material, km_len,
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extract_key);
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if (ret != 0)
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return (ret);
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ret = hkdf_sha512_expand(extract_key, info, info_len, output_key,
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out_len);
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if (ret != 0)
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return (ret);
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return (0);
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}
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