Separate out the HKDF functions into a separate module to
to make them available to other callers.
And add a testsuite to the module with test vectors
from RFC 5869 to ensure the integrity of the algorithm.
Signed-off-by: Hannes Reinecke <hare@xxxxxxxxxx>
Cc: Eric Biggers <ebiggers@xxxxxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx
---
crypto/Kconfig | 6 +
crypto/Makefile | 1 +
crypto/hkdf.c | 402 ++++++++++++++++++++++++++++++++++++++++++
fs/crypto/Kconfig | 1 +
fs/crypto/hkdf.c | 85 ++-------
include/crypto/hkdf.h | 18 ++
6 files changed, 443 insertions(+), 70 deletions(-)
create mode 100644 crypto/hkdf.c
create mode 100644 include/crypto/hkdf.h
diff --git a/crypto/Kconfig b/crypto/Kconfig
index a779cab668c2..bdcee33085b6 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -141,6 +141,12 @@ config CRYPTO_ACOMP
select CRYPTO_ALGAPI
select CRYPTO_ACOMP2
+config CRYPTO_HKDF
+ tristate
+ select CRYPTO_SHA1 if !CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
+ select CRYPTO_SHA256 if !CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
+ select CRYPTO_HASH2
+
config CRYPTO_MANAGER
tristate "Cryptographic algorithm manager"
select CRYPTO_MANAGER2
diff --git a/crypto/Makefile b/crypto/Makefile
index 4c99e5d376f6..5ec5b994d9ae 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
obj-$(CONFIG_CRYPTO_AKCIPHER2) += akcipher.o
obj-$(CONFIG_CRYPTO_SIG2) += sig.o
obj-$(CONFIG_CRYPTO_KPP2) += kpp.o
+obj-$(CONFIG_CRYPTO_HKDF) += hkdf.o
dh_generic-y := dh.o
dh_generic-y += dh_helper.o
diff --git a/crypto/hkdf.c b/crypto/hkdf.c
new file mode 100644
index 000000000000..26dc84f441ed
--- /dev/null
+++ b/crypto/hkdf.c
@@ -0,0 +1,402 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Implementation of HKDF ("HMAC-based Extract-and-Expand Key Derivation
+ * Function"), aka RFC 5869. See also the original paper (Krawczyk 2010):
+ * "Cryptographic Extraction and Key Derivation: The HKDF Scheme".
+ *
+ * Copyright 2019 Google LLC
+ */
+
+#include <crypto/internal/hash.h>
+#include <crypto/sha2.h>
+#include <crypto/hkdf.h>
+#include <linux/module.h>
+
+/*
+ * HKDF consists of two steps:
+ *
+ * 1. HKDF-Extract: extract a pseudorandom key from the input keying material
+ * and optional salt.
+ * 2. HKDF-Expand: expand the pseudorandom key into output keying material of
+ * any length, parameterized by an application-specific info string.
+ *
+ */
+
+/**
+ * hkdf_extract - HKDF-Extract (RFC 5869 section 2.2)
+ * @hmac_tfm: an HMAC transform using the hash function desired for HKDF. The
+ * caller is responsible for setting the @prk afterwards.
+ * @ikm: input keying material
+ * @ikmlen: length of @ikm
+ * @salt: input salt value
+ * @saltlen: length of @salt
+ * @prk: resulting pseudorandom key
+ *
+ * Extracts a pseudorandom key @prk from the input keying material
+ * @ikm with length @ikmlen and salt @salt with length @saltlen.
+ * The length of @prk is given by the digest size of @hmac_tfm.
+ * For an 'unsalted' version of HKDF-Extract @salt must be set
+ * to all zeroes and @saltlen must be set to the length of @prk.
+ *
+ * Returns 0 on success with the pseudorandom key stored in @prk,
+ * or a negative errno value otherwise.
+ */
+int hkdf_extract(struct crypto_shash *hmac_tfm, const u8 *ikm,
+ unsigned int ikmlen, const u8 *salt, unsigned int saltlen,
+ u8 *prk)
+{
+ int err;
+
+ err = crypto_shash_setkey(hmac_tfm, salt, saltlen);
+ if (!err)
+ err = crypto_shash_tfm_digest(hmac_tfm, ikm, ikmlen, prk);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(hkdf_extract);
+
+/**
+ * hkdf_expand - HKDF-Expand (RFC 5869 section 2.3)
+ * @hmac_tfm: hash context keyed with pseudorandom key
+ * @info: application-specific information
+ * @infolen: length of @info
+ * @okm: output keying material
+ * @okmlen: length of @okm
+ *
+ * This expands the pseudorandom key, which was already keyed into @hmac_tfm,
+ * into @okmlen bytes of output keying material parameterized by the
+ * application-specific @info of length @infolen bytes.
+ * This is thread-safe and may be called by multiple threads in parallel.
+ *
+ * Returns 0 on success with output keying material stored in @okm,
+ * or a negative errno value otherwise.
+ */
+int hkdf_expand(struct crypto_shash *hmac_tfm,
+ const u8 *info, unsigned int infolen,
+ u8 *okm, unsigned int okmlen)
+{
+ SHASH_DESC_ON_STACK(desc, hmac_tfm);
+ unsigned int i, hashlen = crypto_shash_digestsize(hmac_tfm);
+ int err;
+ const u8 *prev = NULL;
+ u8 counter = 1;
+ u8 tmp[HASH_MAX_DIGESTSIZE];
+
+ if (WARN_ON(okmlen > 255 * hashlen ||
+ hashlen > HASH_MAX_DIGESTSIZE))
+ return -EINVAL;
+
+ memzero_explicit(tmp, HASH_MAX_DIGESTSIZE);
+
+ desc->tfm = hmac_tfm;
+
+ for (i = 0; i < okmlen; i += hashlen) {
+ err = crypto_shash_init(desc);
+ if (err)
+ goto out;
+
+ if (prev) {
+ err = crypto_shash_update(desc, prev, hashlen);
+ if (err)
+ goto out;
+ }
+
+ if (infolen) {
+ err = crypto_shash_update(desc, info, infolen);
+ if (err)
+ goto out;
+ }
+
+ BUILD_BUG_ON(sizeof(counter) != 1);
+ if (okmlen - i < hashlen) {
+ err = crypto_shash_finup(desc, &counter, 1, tmp);
+ if (err)
+ goto out;
+ memcpy(&okm[i], tmp, okmlen - i);
+ memzero_explicit(tmp, sizeof(tmp));
+ } else {
+ err = crypto_shash_finup(desc, &counter, 1, &okm[i]);
+ if (err)
+ goto out;
+ }
+ counter++;
+ prev = &okm[i];
+ }
+ err = 0;
+out:
+ if (unlikely(err))
+ memzero_explicit(okm, okmlen); /* so caller doesn't need to */
+ shash_desc_zero(desc);
+ memzero_explicit(tmp, HASH_MAX_DIGESTSIZE);
+ return err;
+}
+EXPORT_SYMBOL_GPL(hkdf_expand);
+
+struct hkdf_testvec {
+ const char *test;
+ const u8 *ikm;
+ const u8 *salt;
+ const u8 *info;
+ const u8 *prk;
+ const u8 *okm;
+ u16 ikm_size;
+ u16 salt_size;
+ u16 info_size;
+ u16 prk_size;
+ u16 okm_size;
+};
+
+/*
+ * HKDF test vectors from RFC5869
+ */
+static const struct hkdf_testvec hkdf_sha256_tv[] = {
+ {
+ .test = "basic hdkf test",
+ .ikm = "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
+ "\x0b\x0b\x0b\x0b\x0b\x0b",
+ .ikm_size = 22,
+ .salt = "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c",
+ .salt_size = 13,
+ .info = "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9",
+ .info_size = 10,
+ .prk = "\x07\x77\x09\x36\x2c\x2e\x32\xdf\x0d\xdc\x3f\x0d\xc4\x7b\xba\x63"
+ "\x90\xb6\xc7\x3b\xb5\x0f\x9c\x31\x22\xec\x84\x4a\xd7\xc2\xb3\xe5",
+ .prk_size = 32,
+ .okm = "\x3c\xb2\x5f\x25\xfa\xac\xd5\x7a\x90\x43\x4f\x64\xd0\x36\x2f\x2a"
+ "\x2d\x2d\x0a\x90\xcf\x1a\x5a\x4c\x5d\xb0\x2d\x56\xec\xc4\xc5\xbf"
+ "\x34\x00\x72\x08\xd5\xb8\x87\x18\x58\x65",
+ .okm_size = 42,
+ }, {
+ .test = "hkdf test with long input",
+ .ikm = "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"
+ "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
+ "\x20\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f"
+ "\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f"
+ "\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f",
+ .ikm_size = 80,
+ .salt = "\x60\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f"
+ "\x70\x71\x72\x73\x74\x75\x76\x77,\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f"
+ "\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f"
+ "\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f"
+ "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf",
+ .salt_size = 80,
+ .info = "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf"
+ "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf"
+ "\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf"
+ "\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef"
+ "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff",
+ .info_size = 80,
+ .prk = "\x06\xa6\xb8\x8c\x58\x53\x36\x1a\x06\x10\x4c\x9c\xeb\x35\xb4\x5c"
+ "\xef\x76\x00\x14\x90\x46\x71\x01\x4a\x19\x3f\x40\xc1\x5f\xc2\x44",
+ .prk_size = 32,
+ .okm = "\xb1\x1e\x39\x8d\xc8\x03\x27\xa1\xc8\xe7\xf7\x8c\x59\x6a\x49\x34"
+ "\x4f\x01\x2e\xda\x2d\x4e\xfa\xd8\xa0\x50\xcc\x4c\x19\xaf\xa9\x7c"
+ "\x59\x04\x5a\x99\xca\xc7\x82\x72\x71\xcb\x41\xc6\x5e\x59\x0e\x09"
+ "\xda\x32\x75\x60\x0c\x2f\x09\xb8\x36\x77\x93\xa9\xac\xa3\xdb\x71"
+ "\xcc\x30\xc5\x81\x79\xec\x3e\x87\xc1\x4c\x01\xd5\xc1\xf3\x43\x4f"
+ "\x1d\x87",
+ .okm_size = 82,
+ }, {
+ .test = "hkdf test with zero salt and info",
+ .ikm = "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
+ "\x0b\x0b\x0b\x0b\x0b\x0b",
+ .ikm_size = 22,
+ .salt = NULL,
+ .salt_size = 0,
+ .info = NULL,
+ .info_size = 0,
+ .prk = "\0x19\xef\x24\xa3\x2c\x71\x7b\x16\x7f\x33\xa9\x1d\x6f\x64\x8b\xdf"
+ "\x96\x59\x67\x76\xaf\xdb\x63\x77\xac\x43\x4c\x1c\x29\x3c\xcb\x04",
+ .prk_size = 32,
+ .okm = "\x8d\xa4\xe7\x75\xa5\x63\xc1\x8f\x71\x5f\x80\x2a\x06\x3c\x5a\x31"
+ "\xb8\xa1\x1f\x5c\x5e\xe1\x87\x9e\xc3\x45\x4e\x5f\x3c\x73\x8d\x2d"
+ "\x9d\x20\x13\x95\xfa\xa4\xb6\x1a\x96\xc8",
+ .okm_size = 42,
+ }
+};
+
+static const struct hkdf_testvec hkdf_sha1_tv[] = {
+ {
+ .test = "basic hkdf test",
+ .ikm = "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b",
+ .ikm_size = 11,
+ .salt = "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c",
+ .salt_size = 13,
+ .info = "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9",
+ .info_size = 10,
+ .prk = "\x9b\x6c\x18\xc4\x32\xa7\xbf\x8f\x0e\x71\xc8\xeb\x88\xf4\xb3\x0b"
+ "\xaa\x2b\xa2\x43",
+ .prk_size = 20,
+ .okm = "\x08\x5a\x01\xea\x1b\x10\xf3\x69\x33\x06\x8b\x56\xef\xa5\xad\x81"
+ "\xa4\xf1\x4b\x82\x2f\x5b\x09\x15\x68\xa9\xcd\xd4\xf1\x55\xfd\xa2"
+ "\xc2\x2e\x42\x24\x78\xd3\x05\xf3\xf8\x96",
+ .okm_size = 42,
+ }, {
+ .test = "hkdf test with long input",
+ .ikm = "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"
+ "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
+ "\x20\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f"
+ "\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f"
+ "\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f",
+ .ikm_size = 80,
+ .salt = "\x60\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f"
+ "\x70\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f"
+ "\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f"
+ "\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f"
+ "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf",
+ .salt_size = 80,
+ .info = "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf"
+ "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf"
+ "\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf"
+ "\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef"
+ "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff",
+ .info_size = 80,
+ .prk = "\x8a\xda\xe0\x9a\x2a\x30\x70\x59\x47\x8d\x30\x9b\x26\xc4\x11\x5a"
+ "\x22\x4c\xfa\xf6",
+ .prk_size = 20,
+ .okm = "\x0b\xd7\x70\xa7\x4d\x11\x60\xf7\xc9\xf1\x2c\xd5\x91\x2a\x06\xeb"
+ "\xff\x6a\xdc\xae\x89\x9d\x92\x19\x1f\xe4\x30\x56\x73\xba\x2f\xfe"
+ "\x8f\xa3\xf1\xa4\xe5\xad\x79\xf3\xf3\x34\xb3\xb2\x02\xb2\x17\x3c"
+ "\x48\x6e\xa3\x7c\xe3\xd3\x97\xed\x03\x4c\x7f\x9d\xfe\xb1\x5c\x5e"
+ "\x92\x73\x36\xd0\x44\x1f\x4c\x43\x00\xe2\xcf\xf0\xd0\x90\x0b\x52"
+ "\xd3\xb4",
+ .okm_size = 82,
+ }, {
+ .test = "hkdf test with zero salt and info",
+ .ikm = "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
+ "\x0b\x0b\x0b\x0b\x0b\x0b",
+ .ikm_size = 22,
+ .salt = NULL,
+ .salt_size = 0,
+ .info = NULL,
+ .info_size = 0,
+ .prk = "\xda\x8c\x8a\x73\xc7\xfa\x77\x28\x8e\xc6\xf5\xe7\xc2\x97\x78\x6a"
+ "\xa0\xd3\x2d\x01",
+ .prk_size = 20,
+ .okm = "\x0a\xc1\xaf\x70\x02\xb3\xd7\x61\xd1\xe5\x52\x98\xda\x9d\x05\x06"
+ "\xb9\xae\x52\x05\x72\x20\xa3\x06\xe0\x7b\x6b\x87\xe8\xdf\x21\xd0"
+ "\xea\x00\x03\x3d\xe0\x39\x84\xd3\x49\x18",
+ .okm_size = 42,
+ }, {
+ .test = "unsalted hkdf test with zero info",
+ .ikm = "\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c\x0c"
+ "\x0c\x0c\x0c\x0c\x0c\x0c",
+ .ikm_size = 22,
+ .salt = "\0x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
+ "\x00\x00\x00\x00",
+ .salt_size = 20,
+ .info = NULL,
+ .info_size = 0,
+ .prk = "\x2a\xdc\xca\xda\x18\x77\x9e\x7c\x20\x77\xad\x2e\xb1\x9d\x3f\x3e"
+ "\x73\x13\x85\xdd",
+ .prk_size = 20,
+ .okm = "\x2c\x91\x11\x72\x04\xd7\x45\xf3\x50\x0d\x63\x6a\x62\xf6\x4f\x0a"
+ "\xb3\xba\xe5\x48\xaa\x53\xd4\x23\xb0\xd1\xf2\x7e\xbb\xa6\xf5\xe5"
+ "\x67\x3a\x08\x1d\x70\xcc\xe7\xac\xfc\x48",
+ .okm_size = 42,
+ }
+};
+
+static int hkdf_test(const char *shash, const struct hkdf_testvec *tv)
+{ struct crypto_shash *tfm = NULL;
+ u8 *prk = NULL, *okm = NULL;
+ unsigned int prk_size;
+ const char *driver;
+ int err;
+
+ tfm = crypto_alloc_shash(shash, 0, 0);
+ if (IS_ERR(tfm)) {
+ pr_err("%s(%s): failed to allocate transform: %ld\n",
+ tv->test, shash, PTR_ERR(tfm));
+ return PTR_ERR(tfm);
+ }
+ driver = crypto_shash_driver_name(tfm);
+
+ prk_size = crypto_shash_digestsize(tfm);
+ prk = kzalloc(prk_size, GFP_KERNEL);
+ if (!prk) {
+ err = -ENOMEM;
+ goto out_free;
+ }
+
+ if (tv->prk_size != prk_size) {
+ pr_err("%s(%s): prk size mismatch (vec %u, digest %u\n",
+ tv->test, driver, tv->prk_size, prk_size);
+ err = -EINVAL;
+ goto out_free;
+ }
+
+ err = hkdf_extract(tfm, tv->ikm, tv->ikm_size,
+ tv->salt, tv->salt_size, prk);
+ if (err) {
+ pr_err("%s(%s): hkdf_extract failed with %d\n",
+ tv->test, driver, err);
+ goto out_free;
+ }
+
+ if (memcmp(prk, tv->prk, tv->prk_size)) {
+ pr_err("%s(%s): hkdf_extract prk mismatch\n",
+ tv->test, driver);
+ err = -EINVAL;
+ goto out_free;
+ }
+
+ okm = kzalloc(tv->okm_size, GFP_KERNEL);
+ if (!okm) {
+ err = -ENOMEM;
+ goto out_free;
+ }
+
+ err = crypto_shash_setkey(tfm, tv->prk, tv->prk_size);
+ if (err) {
+ pr_err("%s(%s): failed to set prk, error %d\n",
+ tv->test, driver, err);
+ goto out_free;
+ }
+
+ err = hkdf_expand(tfm, tv->info, tv->info_size,
+ okm, tv->okm_size);
+ if (err) {
+ pr_err("%s(%s): hkdf_expand() failed with %d\n",
+ tv->test, driver, err);
+ } else if (memcmp(okm, tv->okm, tv->okm_size)) {
+ pr_err("%s(%s): hkdf_expand() okm mismatch\n",
+ tv->test, driver);
+ print_hex_dump(KERN_ERR, "okm: ", DUMP_PREFIX_NONE, 16, 1, okm, tv->okm_size, false);
+ err = -EINVAL;
+ }
+out_free:
+ kfree(okm);
+ kfree(prk);
+ crypto_free_shash(tfm);
+ return err;
+}
+
+static int __init crypto_hkdf_module_init(void)
+{
+ int ret = 0, i;
+
+ if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(hkdf_sha256_tv); i++) {
+ ret = hkdf_test("hmac(sha256)", &hkdf_sha256_tv[i]);
+ if (ret)
+ return ret;
+ }
+ for (i = 0; i < ARRAY_SIZE(hkdf_sha1_tv); i++) {
+ ret = hkdf_test("hmac(sha1)", &hkdf_sha1_tv[i]);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static void __exit crypto_hkdf_module_exit(void) {}
+
+module_init(crypto_hkdf_module_init);
+module_exit(crypto_hkdf_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("HMAC-based Key Derivation Function (HKDF)");
+MODULE_ALIAS_CRYPTO("hkdf");
diff --git a/fs/crypto/Kconfig b/fs/crypto/Kconfig
index 5aff5934baa1..0ea56f588a4a 100644
--- a/fs/crypto/Kconfig
+++ b/fs/crypto/Kconfig
@@ -3,6 +3,7 @@ config FS_ENCRYPTION
bool "FS Encryption (Per-file encryption)"
select CRYPTO
select CRYPTO_HASH
+ select CRYPTO_HKDF
select CRYPTO_SKCIPHER
select CRYPTO_LIB_SHA256
select KEYS
diff --git a/fs/crypto/hkdf.c b/fs/crypto/hkdf.c
index 5a384dad2c72..855a0f4b7318 100644
--- a/fs/crypto/hkdf.c
+++ b/fs/crypto/hkdf.c
@@ -1,9 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
/*
- * Implementation of HKDF ("HMAC-based Extract-and-Expand Key Derivation
- * Function"), aka RFC 5869. See also the original paper (Krawczyk 2010):
- * "Cryptographic Extraction and Key Derivation: The HKDF Scheme".
- *
* This is used to derive keys from the fscrypt master keys.
*
* Copyright 2019 Google LLC
@@ -11,6 +7,7 @@
#include <crypto/hash.h>
#include <crypto/sha2.h>
+#include <crypto/hkdf.h>
#include "fscrypt_private.h"
@@ -44,20 +41,6 @@
* there's no way to persist a random salt per master key from kernel mode.
*/
-/* HKDF-Extract (RFC 5869 section 2.2), unsalted */
-static int hkdf_extract(struct crypto_shash *hmac_tfm, const u8 *ikm,
- unsigned int ikmlen, u8 prk[HKDF_HASHLEN])
-{
- static const u8 default_salt[HKDF_HASHLEN];
- int err;
-
- err = crypto_shash_setkey(hmac_tfm, default_salt, HKDF_HASHLEN);
- if (err)
- return err;
-
- return crypto_shash_tfm_digest(hmac_tfm, ikm, ikmlen, prk);
-}
-
/*
* Compute HKDF-Extract using the given master key as the input keying material,
* and prepare an HMAC transform object keyed by the resulting pseudorandom key.
@@ -69,6 +52,7 @@ int fscrypt_init_hkdf(struct fscrypt_hkdf *hkdf, const u8 *master_key,
unsigned int master_key_size)
{
struct crypto_shash *hmac_tfm;
+ static const u8 default_salt[HKDF_HASHLEN];
u8 prk[HKDF_HASHLEN];
int err;
@@ -84,7 +68,8 @@ int fscrypt_init_hkdf(struct fscrypt_hkdf *hkdf, const u8 *master_key,
goto err_free_tfm;
}
- err = hkdf_extract(hmac_tfm, master_key, master_key_size, prk);
+ err = hkdf_extract(hmac_tfm, master_key, master_key_size,
+ default_salt, HKDF_HASHLEN, prk);
if (err)
goto err_free_tfm;
@@ -118,61 +103,21 @@ int fscrypt_hkdf_expand(const struct fscrypt_hkdf *hkdf, u8 context,
u8 *okm, unsigned int okmlen)
{
SHASH_DESC_ON_STACK(desc, hkdf->hmac_tfm);
- u8 prefix[9];
- unsigned int i;
+ u8 *full_info;
int err;
- const u8 *prev = NULL;
- u8 counter = 1;
- u8 tmp[HKDF_HASHLEN];
-
- if (WARN_ON_ONCE(okmlen > 255 * HKDF_HASHLEN))
- return -EINVAL;
+ full_info = kzalloc(infolen + 9, GFP_KERNEL);
+ if (!full_info)
+ return -ENOMEM;
desc->tfm = hkdf->hmac_tfm;
- memcpy(prefix, "fscrypt\0", 8);
- prefix[8] = context;
-
- for (i = 0; i < okmlen; i += HKDF_HASHLEN) {
-
- err = crypto_shash_init(desc);
- if (err)
- goto out;
-
- if (prev) {
- err = crypto_shash_update(desc, prev, HKDF_HASHLEN);
- if (err)
- goto out;
- }
-
- err = crypto_shash_update(desc, prefix, sizeof(prefix));
- if (err)
- goto out;
-
- err = crypto_shash_update(desc, info, infolen);
- if (err)
- goto out;
-
- BUILD_BUG_ON(sizeof(counter) != 1);
- if (okmlen - i < HKDF_HASHLEN) {
- err = crypto_shash_finup(desc, &counter, 1, tmp);
- if (err)
- goto out;
- memcpy(&okm[i], tmp, okmlen - i);
- memzero_explicit(tmp, sizeof(tmp));
- } else {
- err = crypto_shash_finup(desc, &counter, 1, &okm[i]);
- if (err)
- goto out;
- }
- counter++;
- prev = &okm[i];
- }
- err = 0;
-out:
- if (unlikely(err))
- memzero_explicit(okm, okmlen); /* so caller doesn't need to */
- shash_desc_zero(desc);
+ memcpy(full_info, "fscrypt\0", 8);
+ full_info[8] = context;
+ memcpy(full_info + 9, info, infolen);
+
+ err = hkdf_expand(hkdf->hmac_tfm, full_info, infolen + 9,
+ okm, okmlen);
+ kfree_sensitive(full_info);
return err;
}
diff --git a/include/crypto/hkdf.h b/include/crypto/hkdf.h
new file mode 100644
index 000000000000..c1f23a32a6b6
--- /dev/null
+++ b/include/crypto/hkdf.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * HKDF: HMAC-based Key Derivation Function (HKDF), RFC 5869
+ *
+ * Extracted from fs/crypto/hkdf.c, which has
+ * Copyright 2019 Google LLC
+ */
+
+#ifndef _CRYPTO_HKDF_H
+#define _CRYPTO_HKDF_H
+
+int hkdf_extract(struct crypto_shash *hmac_tfm, const u8 *ikm,
+ unsigned int ikmlen, const u8 *salt, unsigned int saltlen,
+ u8 *prk);
+int hkdf_expand(struct crypto_shash *hmac_tfm,
+ const u8 *info, unsigned int infolen,
+ u8 *okm, unsigned int okmlen);
+#endif
--
2.35.3
