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crypto: move pbkdf2_sha1 to crypto.c

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This commit is contained in:
Denis Kenzior 2016-02-10 14:32:27 -06:00
parent b190283be7
commit ac4a901518
5 changed files with 65 additions and 113 deletions
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2
Makefile.am
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@ -140,7 +140,7 @@ unit_test_hmac_sha256_SOURCES = unit/test-hmac-sha256.c \
unit_test_hmac_sha256_LDADD = ell/libell-internal.la
unit_test_pbkdf2_sha1_SOURCES = unit/test-pbkdf2-sha1.c \
src/sha1.h src/sha1.c
src/crypto.h src/crypto.c
unit_test_pbkdf2_sha1_LDADD = ell/libell-internal.la
unit_test_prf_sha1_SOURCES = unit/test-prf-sha1.c \

60
src/crypto.c
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@ -188,6 +188,66 @@ int crypto_cipher_tk_bits(enum crypto_cipher cipher)
return crypto_cipher_key_len(cipher) * 8;
}
#define SHA1_MAC_LEN 20
static void F(struct l_checksum *checksum,
const char *salt, size_t salt_len,
unsigned int iterations, unsigned int count,
unsigned char *digest)
{
unsigned char tmp[SHA1_MAC_LEN];
unsigned char buf[36];
unsigned int i, j;
memcpy(buf, salt, salt_len);
buf[salt_len + 0] = (count >> 24) & 0xff;
buf[salt_len + 1] = (count >> 16) & 0xff;
buf[salt_len + 2] = (count >> 8) & 0xff;
buf[salt_len + 3] = count & 0xff;
l_checksum_update(checksum, buf, salt_len + 4);
l_checksum_get_digest(checksum, tmp, SHA1_MAC_LEN);
memcpy(digest, tmp, SHA1_MAC_LEN);
for (i = 1; i < iterations; i++) {
l_checksum_update(checksum, tmp, SHA1_MAC_LEN);
l_checksum_get_digest(checksum, tmp, SHA1_MAC_LEN);
for (j = 0; j < SHA1_MAC_LEN; j++)
digest[j] ^= tmp[j];
}
}
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)
{
struct l_checksum *checksum;
unsigned char *ptr = output;
unsigned char digest[SHA1_MAC_LEN];
unsigned int i;
checksum = l_checksum_new_hmac(L_CHECKSUM_SHA1, password, password_len);
if (!checksum)
return false;
for (i = 1; size > 0; i++) {
size_t len;
F(checksum, salt, salt_len, iterations, i, digest);
len = size > SHA1_MAC_LEN ? SHA1_MAC_LEN : size;
memcpy(ptr, digest, len);
ptr += len;
size -= len;
}
l_checksum_free(checksum);
return true;
}
int crypto_psk_from_passphrase(const char *passphrase,
const unsigned char *ssid, size_t ssid_len,
unsigned char *out_psk)

4
src/crypto.h
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@ -54,6 +54,10 @@ bool arc4_skip(const uint8_t *key, size_t key_len, size_t skip,
int crypto_cipher_key_len(enum crypto_cipher cipher);
int crypto_cipher_tk_bits(enum crypto_cipher cipher);
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);
int crypto_psk_from_passphrase(const char *passphrase,
const unsigned char *ssid, size_t ssid_len,
unsigned char *out_psk);

109
src/sha1.c
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@ -27,112 +27,3 @@
#include <string.h>
#include <ell/ell.h>
#include "src/sha1.h"
#define SHA1_MAC_LEN 20
static void __hmac_sha1(struct l_checksum *checksum,
const void *key, size_t key_len,
const void *data, size_t data_len,
void *output, size_t size)
{
unsigned char ipad[64];
unsigned char opad[64];
unsigned char digest[SHA1_MAC_LEN];
int i;
/* if key is longer than 64 bytes reset it to key=SHA1(key) */
if (key_len > 64) {
l_checksum_update(checksum, key, key_len);
l_checksum_get_digest(checksum, digest, SHA1_MAC_LEN);
key = digest;
key_len = SHA1_MAC_LEN;
}
/* start out by storing key in pads */
memset(ipad, 0, sizeof(ipad));
memset(opad, 0, sizeof(opad));
memcpy(ipad, key, key_len);
memcpy(opad, key, key_len);
/* XOR key with ipad and opad values */
for (i = 0; i < 64; i++) {
ipad[i] ^= 0x36;
opad[i] ^= 0x5c;
}
/* perform inner SHA1 */
l_checksum_update(checksum, ipad, sizeof(ipad));
l_checksum_update(checksum, data, data_len);
l_checksum_get_digest(checksum, digest, SHA1_MAC_LEN);
/* perform outer SHA1 */
l_checksum_update(checksum, opad, sizeof(opad));
l_checksum_update(checksum, digest, SHA1_MAC_LEN);
l_checksum_get_digest(checksum, output,
size > SHA1_MAC_LEN ? SHA1_MAC_LEN : size);
}
static void F(struct l_checksum *checksum,
const char *password, size_t password_len,
const char *salt, size_t salt_len,
unsigned int iterations, unsigned int count,
unsigned char *digest)
{
unsigned char tmp1[SHA1_MAC_LEN];
unsigned char tmp2[SHA1_MAC_LEN];
unsigned char buf[36];
unsigned int i, j;
memcpy(buf, salt, salt_len);
buf[salt_len + 0] = (count >> 24) & 0xff;
buf[salt_len + 1] = (count >> 16) & 0xff;
buf[salt_len + 2] = (count >> 8) & 0xff;
buf[salt_len + 3] = count & 0xff;
__hmac_sha1(checksum, password, password_len,
buf, salt_len + 4, tmp1, SHA1_MAC_LEN);
memcpy(digest, tmp1, SHA1_MAC_LEN);
for (i = 1; i < iterations; i++) {
__hmac_sha1(checksum, password, password_len,
tmp1, SHA1_MAC_LEN, tmp2, SHA1_MAC_LEN);
memcpy(tmp1, tmp2, SHA1_MAC_LEN);
for (j = 0; j < SHA1_MAC_LEN; j++)
digest[j] ^= tmp2[j];
}
}
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)
{
struct l_checksum *checksum;
unsigned char *ptr = output;
unsigned char digest[SHA1_MAC_LEN];
unsigned int i;
checksum = l_checksum_new(L_CHECKSUM_SHA1);
if (!checksum)
return false;
for (i = 1; size > 0; i++) {
size_t len;
F(checksum, password, password_len, salt, salt_len,
iterations, i, digest);
len = size > SHA1_MAC_LEN ? SHA1_MAC_LEN : size;
memcpy(ptr, digest, len);
ptr += len;
size -= len;
}
l_checksum_free(checksum);
return true;
}

3
src/sha1.h
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@ -22,6 +22,3 @@
#include <stdbool.h>
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);