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crypto: Move + rework prf_sha1 into crypto.c

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This commit is contained in:
Denis Kenzior 2016-02-10 14:16:32 -06:00
parent 694ed08e30
commit 6199960b52
5 changed files with 46 additions and 46 deletions
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5
Makefile.am
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@ -135,8 +135,8 @@ unit_test_hmac_sha1_SOURCES = unit/test-hmac-sha1.c \
unit_test_hmac_sha1_LDADD = ell/libell-internal.la
unit_test_hmac_sha256_SOURCES = unit/test-hmac-sha256.c \
src/sha1.h src/sha1.c \
src/crypto.h src/crypto.c
src/crypto.h src/crypto.c \
src/sha1.h src/sha1.c
unit_test_hmac_sha256_LDADD = ell/libell-internal.la
unit_test_pbkdf2_sha1_SOURCES = unit/test-pbkdf2-sha1.c \
@ -144,6 +144,7 @@ unit_test_pbkdf2_sha1_SOURCES = unit/test-pbkdf2-sha1.c \
unit_test_pbkdf2_sha1_LDADD = ell/libell-internal.la
unit_test_prf_sha1_SOURCES = unit/test-prf-sha1.c \
src/crypto.h src/crypto.c \
src/sha1.h src/sha1.c
unit_test_prf_sha1_LDADD = ell/libell-internal.la

39
src/crypto.c
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@ -241,6 +241,45 @@ int crypto_psk_from_passphrase(const char *passphrase,
return 0;
}
bool prf_sha1(const void *key, size_t key_len,
const void *prefix, size_t prefix_len,
const void *data, size_t data_len, void *output, size_t size)
{
struct l_checksum *hmac;
unsigned int i, offset = 0;
unsigned char empty = '\0';
unsigned char counter;
struct iovec iov[4] = {
[0] = { .iov_base = (void *) prefix, .iov_len = prefix_len },
[1] = { .iov_base = &empty, .iov_len = 1 },
[2] = { .iov_base = (void *) data, .iov_len = data_len },
[3] = { .iov_base = &counter, .iov_len = 1 },
};
hmac = l_checksum_new_hmac(L_CHECKSUM_SHA1, key, key_len);
if (!hmac)
return false;
/* PRF processes in 160-bit chunks (20 bytes) */
for (i = 0, counter = 0; i < (size + 19) / 20; i++, counter++) {
size_t len;
if (size - offset > 20)
len = 20;
else
len = size - offset;
l_checksum_updatev(hmac, iov, 4);
l_checksum_get_digest(hmac, output + offset, len);
offset += len;
}
l_checksum_free(hmac);
return true;
}
/*
* 802.11, Section 11.6.6.7:
* PTK = PRF-X(PMK, "Pairwise key expansion", Min(AA, SA) || Max(AA, SA) ||

4
src/crypto.h
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@ -58,6 +58,10 @@ int crypto_psk_from_passphrase(const char *passphrase,
const unsigned char *ssid, size_t ssid_len,
unsigned char *out_psk);
bool prf_sha1(const void *key, size_t key_len,
const void *prefix, size_t prefix_len,
const void *data, size_t data_len, void *output, size_t size);
bool crypto_derive_ptk(const uint8_t *pmk, size_t pmk_len, const char *label,
const uint8_t *addr1, const uint8_t *addr2,
const uint8_t *nonce1, const uint8_t *nonce2,

40
src/sha1.c
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@ -136,43 +136,3 @@ bool pbkdf2_sha1(const void *password, size_t password_len,
return true;
}
bool prf_sha1(const void *key, size_t key_len,
const void *prefix, size_t prefix_len,
const void *data, size_t data_len, void *output, size_t size)
{
struct l_checksum *checksum;
unsigned char input[1024];
size_t input_len;
unsigned int i, offset = 0;
checksum = l_checksum_new(L_CHECKSUM_SHA1);
if (!checksum)
return false;
memcpy(input, prefix, prefix_len);
input[prefix_len] = 0;
memcpy(input + prefix_len + 1, data, data_len);
input[prefix_len + 1 + data_len] = 0;
input_len = prefix_len + 1 + data_len + 1;
for (i = 0; i < (size + 19) / 20; i++) {
size_t len;
if (size - offset > SHA1_MAC_LEN)
len = SHA1_MAC_LEN;
else
len = size - offset;
__hmac_sha1(checksum, key, key_len, input, input_len,
output + offset, len);
offset += len;
input[input_len - 1]++;
}
l_checksum_free(checksum);
return true;
}

4
src/sha1.h
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@ -25,7 +25,3 @@
bool pbkdf2_sha1(const void *password, size_t password_len,
const void *salt, size_t salt_len,
unsigned int iterations, void *output, size_t size);
bool prf_sha1(const void *key, size_t key_len,
const void *prefix, size_t prefix_len,
const void *data, size_t data_len, void *output, size_t size);