#include "php.h"
#include "php_main.h"
#include <errno.h>
#include <limits.h>
#ifdef PHP_WIN32
# define __alignof__ __alignof
# define alloca _alloca
#else
# ifndef HAVE_ALIGNOF
# include <stddef.h>
# define __alignof__(type) offsetof (struct { char c; type member;}, member)
# endif
# if HAVE_ATTRIBUTE_ALIGNED
# define ALIGNED(size) __attribute__ ((__aligned__ (size)))
# else
# define ALIGNED(size)
# endif
#endif
#include <stdio.h>
#include <stdlib.h>
#ifdef PHP_WIN32
# include <string.h>
#else
# include <sys/param.h>
# include <sys/types.h>
# if HAVE_STRING_H
# include <string.h>
# else
# include <strings.h>
# endif
#endif
char * __php_stpncpy(char *dst, const char *src, size_t len)
{
size_t n = strlen(src);
if (n > len) {
n = len;
}
return strncpy(dst, src, len) + n;
}
void * __php_mempcpy(void * dst, const void * src, size_t len)
{
return (((char *)memcpy(dst, src, len)) + len);
}
#ifndef MIN
# define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
#ifndef MAX
# define MAX(a, b) (((a) > (b)) ? (a) : (b))
#endif
struct sha256_ctx {
uint32_t H[8];
uint32_t total[2];
uint32_t buflen;
char buffer[128];
};
#if PHP_WIN32 || (!defined(WORDS_BIGENDIAN))
# define SWAP(n) \
(((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
#else
# define SWAP(n) (n)
#endif
static const unsigned char fillbuf[64] = { 0x80, 0 };
static const uint32_t K[64] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
static void sha256_process_block (const void *buffer, size_t len, struct sha256_ctx *ctx) {
const uint32_t *words = buffer;
size_t nwords = len / sizeof (uint32_t);
unsigned int t;
uint32_t a = ctx->H[0];
uint32_t b = ctx->H[1];
uint32_t c = ctx->H[2];
uint32_t d = ctx->H[3];
uint32_t e = ctx->H[4];
uint32_t f = ctx->H[5];
uint32_t g = ctx->H[6];
uint32_t h = ctx->H[7];
ctx->total[0] += len;
if (ctx->total[0] < len) {
++ctx->total[1];
}
while (nwords > 0) {
uint32_t W[64];
uint32_t a_save = a;
uint32_t b_save = b;
uint32_t c_save = c;
uint32_t d_save = d;
uint32_t e_save = e;
uint32_t f_save = f;
uint32_t g_save = g;
uint32_t h_save = h;
#define Ch(x, y, z) ((x & y) ^ (~x & z))
#define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
#define S0(x) (CYCLIC (x, 2) ^ CYCLIC (x, 13) ^ CYCLIC (x, 22))
#define S1(x) (CYCLIC (x, 6) ^ CYCLIC (x, 11) ^ CYCLIC (x, 25))
#define R0(x) (CYCLIC (x, 7) ^ CYCLIC (x, 18) ^ (x >> 3))
#define R1(x) (CYCLIC (x, 17) ^ CYCLIC (x, 19) ^ (x >> 10))
#define CYCLIC(w, s) ((w >> s) | (w << (32 - s)))
for (t = 0; t < 16; ++t) {
W[t] = SWAP (*words);
++words;
}
for (t = 16; t < 64; ++t)
W[t] = R1 (W[t - 2]) + W[t - 7] + R0 (W[t - 15]) + W[t - 16];
for (t = 0; t < 64; ++t) {
uint32_t T1 = h + S1 (e) + Ch (e, f, g) + K[t] + W[t];
uint32_t T2 = S0 (a) + Maj (a, b, c);
h = g;
g = f;
f = e;
e = d + T1;
d = c;
c = b;
b = a;
a = T1 + T2;
}
a += a_save;
b += b_save;
c += c_save;
d += d_save;
e += e_save;
f += f_save;
g += g_save;
h += h_save;
nwords -= 16;
}
ctx->H[0] = a;
ctx->H[1] = b;
ctx->H[2] = c;
ctx->H[3] = d;
ctx->H[4] = e;
ctx->H[5] = f;
ctx->H[6] = g;
ctx->H[7] = h;
}
static void sha256_init_ctx(struct sha256_ctx *ctx) {
ctx->H[0] = 0x6a09e667;
ctx->H[1] = 0xbb67ae85;
ctx->H[2] = 0x3c6ef372;
ctx->H[3] = 0xa54ff53a;
ctx->H[4] = 0x510e527f;
ctx->H[5] = 0x9b05688c;
ctx->H[6] = 0x1f83d9ab;
ctx->H[7] = 0x5be0cd19;
ctx->total[0] = ctx->total[1] = 0;
ctx->buflen = 0;
}
static void * sha256_finish_ctx(struct sha256_ctx *ctx, void *resbuf) {
uint32_t bytes = ctx->buflen;
size_t pad;
unsigned int i;
ctx->total[0] += bytes;
if (ctx->total[0] < bytes) {
++ctx->total[1];
}
pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
memcpy(&ctx->buffer[bytes], fillbuf, pad);
*(uint32_t *) &ctx->buffer[bytes + pad + 4] = SWAP (ctx->total[0] << 3);
*(uint32_t *) &ctx->buffer[bytes + pad] = SWAP ((ctx->total[1] << 3) |
(ctx->total[0] >> 29));
sha256_process_block(ctx->buffer, bytes + pad + 8, ctx);
for (i = 0; i < 8; ++i) {
((uint32_t *) resbuf)[i] = SWAP(ctx->H[i]);
}
return resbuf;
}
static void sha256_process_bytes(const void *buffer, size_t len, struct sha256_ctx *ctx) {
if (ctx->buflen != 0) {
size_t left_over = ctx->buflen;
size_t add = 128 - left_over > len ? len : 128 - left_over;
memcpy(&ctx->buffer[left_over], buffer, add);
ctx->buflen += add;
if (ctx->buflen > 64) {
sha256_process_block(ctx->buffer, ctx->buflen & ~63, ctx);
ctx->buflen &= 63;
memcpy(ctx->buffer, &ctx->buffer[(left_over + add) & ~63], ctx->buflen);
}
buffer = (const char *) buffer + add;
len -= add;
}
if (len >= 64) {
#if __GNUC__ >= 2
# define UNALIGNED_P(p) (((uintptr_t) p) % __alignof__ (uint32_t) != 0)
#else
# define UNALIGNED_P(p) (((uintptr_t) p) % sizeof (uint32_t) != 0)
#endif
if (UNALIGNED_P (buffer))
while (len > 64) {
sha256_process_block(memcpy(ctx->buffer, buffer, 64), 64, ctx);
buffer = (const char *) buffer + 64;
len -= 64;
} else {
sha256_process_block(buffer, len & ~63, ctx);
buffer = (const char *) buffer + (len & ~63);
len &= 63;
}
}
if (len > 0) {
size_t left_over = ctx->buflen;
memcpy(&ctx->buffer[left_over], buffer, len);
left_over += len;
if (left_over >= 64) {
sha256_process_block(ctx->buffer, 64, ctx);
left_over -= 64;
memcpy(ctx->buffer, &ctx->buffer[64], left_over);
}
ctx->buflen = left_over;
}
}
static const char sha256_salt_prefix[] = "$5$";
static const char sha256_rounds_prefix[] = "rounds=";
#define SALT_LEN_MAX 16
#define ROUNDS_DEFAULT 5000
#define ROUNDS_MIN 1000
#define ROUNDS_MAX 999999999
static const char b64t[64] =
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
char * php_sha256_crypt_r(const char *key, const char *salt, char *buffer, int buflen)
{
#ifdef PHP_WIN32
# if _MSC <= 1300
# pragma pack(push, 16)
unsigned char alt_result[32];
unsigned char temp_result[32];
# pragma pack(pop)
# else
__declspec(align(32)) unsigned char alt_result[32];
__declspec(align(32)) unsigned char temp_result[32];
# endif
#else
unsigned char alt_result[32] ALIGNED(__alignof__ (uint32_t));
unsigned char temp_result[32] ALIGNED(__alignof__ (uint32_t));
#endif
struct sha256_ctx ctx;
struct sha256_ctx alt_ctx;
size_t salt_len;
size_t key_len;
size_t cnt;
char *cp;
char *copied_key = NULL;
char *copied_salt = NULL;
char *p_bytes;
char *s_bytes;
size_t rounds = ROUNDS_DEFAULT;
zend_bool rounds_custom = 0;
if (strncmp(sha256_salt_prefix, salt, sizeof(sha256_salt_prefix) - 1) == 0) {
salt += sizeof(sha256_salt_prefix) - 1;
}
if (strncmp(salt, sha256_rounds_prefix, sizeof(sha256_rounds_prefix) - 1) == 0) {
const char *num = salt + sizeof(sha256_rounds_prefix) - 1;
char *endp;
unsigned long int srounds = strtoul(num, &endp, 10);
if (*endp == '$') {
salt = endp + 1;
rounds = MAX(ROUNDS_MIN, MIN(srounds, ROUNDS_MAX));
rounds_custom = 1;
}
}
salt_len = MIN(strcspn(salt, "$"), SALT_LEN_MAX);
key_len = strlen(key);
if ((key - (char *) 0) % __alignof__ (uint32_t) != 0) {
char *tmp = (char *) alloca(key_len + __alignof__(uint32_t));
key = copied_key = memcpy(tmp + __alignof__(uint32_t) - (tmp - (char *) 0) % __alignof__(uint32_t), key, key_len);
}
if ((salt - (char *) 0) % __alignof__(uint32_t) != 0) {
char *tmp = (char *) alloca(salt_len + 1 + __alignof__(uint32_t));
salt = copied_salt =
memcpy(tmp + __alignof__(uint32_t) - (tmp - (char *) 0) % __alignof__ (uint32_t), salt, salt_len);
copied_salt[salt_len] = 0;
}
sha256_init_ctx(&ctx);
sha256_process_bytes(key, key_len, &ctx);
sha256_process_bytes(salt, salt_len, &ctx);
sha256_init_ctx(&alt_ctx);
sha256_process_bytes(key, key_len, &alt_ctx);
sha256_process_bytes(salt, salt_len, &alt_ctx);
sha256_process_bytes(key, key_len, &alt_ctx);
sha256_finish_ctx(&alt_ctx, alt_result);
for (cnt = key_len; cnt > 32; cnt -= 32) {
sha256_process_bytes(alt_result, 32, &ctx);
}
sha256_process_bytes(alt_result, cnt, &ctx);
for (cnt = key_len; cnt > 0; cnt >>= 1) {
if ((cnt & 1) != 0) {
sha256_process_bytes(alt_result, 32, &ctx);
} else {
sha256_process_bytes(key, key_len, &ctx);
}
}
sha256_finish_ctx(&ctx, alt_result);
sha256_init_ctx(&alt_ctx);
for (cnt = 0; cnt < key_len; ++cnt) {
sha256_process_bytes(key, key_len, &alt_ctx);
}
sha256_finish_ctx(&alt_ctx, temp_result);
cp = p_bytes = alloca(key_len);
for (cnt = key_len; cnt >= 32; cnt -= 32) {
cp = __php_mempcpy((void *)cp, (const void *)temp_result, 32);
}
memcpy(cp, temp_result, cnt);
sha256_init_ctx(&alt_ctx);
for (cnt = 0; cnt < (size_t) (16 + alt_result[0]); ++cnt) {
sha256_process_bytes(salt, salt_len, &alt_ctx);
}
sha256_finish_ctx(&alt_ctx, temp_result);
cp = s_bytes = alloca(salt_len);
for (cnt = salt_len; cnt >= 32; cnt -= 32) {
cp = __php_mempcpy(cp, temp_result, 32);
}
memcpy(cp, temp_result, cnt);
for (cnt = 0; cnt < rounds; ++cnt) {
sha256_init_ctx(&ctx);
if ((cnt & 1) != 0) {
sha256_process_bytes(p_bytes, key_len, &ctx);
} else {
sha256_process_bytes(alt_result, 32, &ctx);
}
if (cnt % 3 != 0) {
sha256_process_bytes(s_bytes, salt_len, &ctx);
}
if (cnt % 7 != 0) {
sha256_process_bytes(p_bytes, key_len, &ctx);
}
if ((cnt & 1) != 0) {
sha256_process_bytes(alt_result, 32, &ctx);
} else {
sha256_process_bytes(p_bytes, key_len, &ctx);
}
sha256_finish_ctx(&ctx, alt_result);
}
cp = __php_stpncpy(buffer, sha256_salt_prefix, MAX(0, buflen));
buflen -= sizeof(sha256_salt_prefix) - 1;
if (rounds_custom) {
#ifdef PHP_WIN32
int n = _snprintf(cp, MAX(0, buflen), "%s%u$", sha256_rounds_prefix, rounds);
#else
int n = snprintf(cp, MAX(0, buflen), "%s%zu$", sha256_rounds_prefix, rounds);
#endif
cp += n;
buflen -= n;
}
cp = __php_stpncpy(cp, salt, MIN ((size_t) MAX (0, buflen), salt_len));
buflen -= MIN((size_t) MAX (0, buflen), salt_len);
if (buflen > 0) {
*cp++ = '$';
--buflen;
}
#define b64_from_24bit(B2, B1, B0, N) \
do { \
unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0); \
int n = (N); \
while (n-- > 0 && buflen > 0) \
{ \
*cp++ = b64t[w & 0x3f]; \
--buflen; \
w >>= 6; \
} \
} while (0)
b64_from_24bit(alt_result[0], alt_result[10], alt_result[20], 4);
b64_from_24bit(alt_result[21], alt_result[1], alt_result[11], 4);
b64_from_24bit(alt_result[12], alt_result[22], alt_result[2], 4);
b64_from_24bit(alt_result[3], alt_result[13], alt_result[23], 4);
b64_from_24bit(alt_result[24], alt_result[4], alt_result[14], 4);
b64_from_24bit(alt_result[15], alt_result[25], alt_result[5], 4);
b64_from_24bit(alt_result[6], alt_result[16], alt_result[26], 4);
b64_from_24bit(alt_result[27], alt_result[7], alt_result[17], 4);
b64_from_24bit(alt_result[18], alt_result[28], alt_result[8], 4);
b64_from_24bit(alt_result[9], alt_result[19], alt_result[29], 4);
b64_from_24bit(0, alt_result[31], alt_result[30], 3);
if (buflen <= 0) {
errno = ERANGE;
buffer = NULL;
} else
*cp = '\0';
sha256_init_ctx(&ctx);
sha256_finish_ctx(&ctx, alt_result);
memset(temp_result, '\0', sizeof(temp_result));
memset(p_bytes, '\0', key_len);
memset(s_bytes, '\0', salt_len);
memset(&ctx, '\0', sizeof(ctx));
memset(&alt_ctx, '\0', sizeof(alt_ctx));
if (copied_key != NULL) {
memset(copied_key, '\0', key_len);
}
if (copied_salt != NULL) {
memset(copied_salt, '\0', salt_len);
}
return buffer;
}
char * php_sha256_crypt(const char *key, const char *salt)
{
static char *buffer;
static int buflen;
int needed = (sizeof(sha256_salt_prefix) - 1
+ sizeof(sha256_rounds_prefix) + 9 + 1
+ strlen(salt) + 1 + 43 + 1);
if (buflen < needed) {
char *new_buffer = (char *) realloc(buffer, needed);
if (new_buffer == NULL) {
return NULL;
}
buffer = new_buffer;
buflen = needed;
}
return php_sha256_crypt_r(key, salt, buffer, buflen);
}
#ifdef TEST
static const struct
{
const char *input;
const char result[32];
} tests[] =
{
{ "abc",
"\xba\x78\x16\xbf\x8f\x01\xcf\xea\x41\x41\x40\xde\x5d\xae\x22\x23"
"\xb0\x03\x61\xa3\x96\x17\x7a\x9c\xb4\x10\xff\x61\xf2\x00\x15\xad" },
{ "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
"\x24\x8d\x6a\x61\xd2\x06\x38\xb8\xe5\xc0\x26\x93\x0c\x3e\x60\x39"
"\xa3\x3c\xe4\x59\x64\xff\x21\x67\xf6\xec\xed\xd4\x19\xdb\x06\xc1" },
{ "",
"\xe3\xb0\xc4\x42\x98\xfc\x1c\x14\x9a\xfb\xf4\xc8\x99\x6f\xb9\x24"
"\x27\xae\x41\xe4\x64\x9b\x93\x4c\xa4\x95\x99\x1b\x78\x52\xb8\x55" },
{ "a",
"\xca\x97\x81\x12\xca\x1b\xbd\xca\xfa\xc2\x31\xb3\x9a\x23\xdc\x4d"
"\xa7\x86\xef\xf8\x14\x7c\x4e\x72\xb9\x80\x77\x85\xaf\xee\x48\xbb" },
{ "message digest",
"\xf7\x84\x6f\x55\xcf\x23\xe1\x4e\xeb\xea\xb5\xb4\xe1\x55\x0c\xad"
"\x5b\x50\x9e\x33\x48\xfb\xc4\xef\xa3\xa1\x41\x3d\x39\x3c\xb6\x50" },
{ "abcdefghijklmnopqrstuvwxyz",
"\x71\xc4\x80\xdf\x93\xd6\xae\x2f\x1e\xfa\xd1\x44\x7c\x66\xc9\x52"
"\x5e\x31\x62\x18\xcf\x51\xfc\x8d\x9e\xd8\x32\xf2\xda\xf1\x8b\x73" },
{ "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
"\x24\x8d\x6a\x61\xd2\x06\x38\xb8\xe5\xc0\x26\x93\x0c\x3e\x60\x39"
"\xa3\x3c\xe4\x59\x64\xff\x21\x67\xf6\xec\xed\xd4\x19\xdb\x06\xc1" },
{ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
"\xdb\x4b\xfc\xbd\x4d\xa0\xcd\x85\xa6\x0c\x3c\x37\xd3\xfb\xd8\x80"
"\x5c\x77\xf1\x5f\xc6\xb1\xfd\xfe\x61\x4e\xe0\xa7\xc8\xfd\xb4\xc0" },
{ "123456789012345678901234567890123456789012345678901234567890"
"12345678901234567890",
"\xf3\x71\xbc\x4a\x31\x1f\x2b\x00\x9e\xef\x95\x2d\xd8\x3c\xa8\x0e"
"\x2b\x60\x02\x6c\x8e\x93\x55\x92\xd0\xf9\xc3\x08\x45\x3c\x81\x3e" }
};
#define ntests (sizeof (tests) / sizeof (tests[0]))
static const struct
{
const char *salt;
const char *input;
const char *expected;
} tests2[] =
{
{ "$5$saltstring", "Hello world!",
"$5$saltstring$5B8vYYiY.CVt1RlTTf8KbXBH3hsxY/GNooZaBBGWEc5" },
{ "$5$rounds=10000$saltstringsaltstring", "Hello world!",
"$5$rounds=10000$saltstringsaltst$3xv.VbSHBb41AL9AvLeujZkZRBAwqFMz2."
"opqey6IcA" },
{ "$5$rounds=5000$toolongsaltstring", "This is just a test",
"$5$rounds=5000$toolongsaltstrin$Un/5jzAHMgOGZ5.mWJpuVolil07guHPvOW8"
"mGRcvxa5" },
{ "$5$rounds=1400$anotherlongsaltstring",
"a very much longer text to encrypt. This one even stretches over more"
"than one line.",
"$5$rounds=1400$anotherlongsalts$Rx.j8H.h8HjEDGomFU8bDkXm3XIUnzyxf12"
"oP84Bnq1" },
{ "$5$rounds=77777$short",
"we have a short salt string but not a short password",
"$5$rounds=77777$short$JiO1O3ZpDAxGJeaDIuqCoEFysAe1mZNJRs3pw0KQRd/" },
{ "$5$rounds=123456$asaltof16chars..", "a short string",
"$5$rounds=123456$asaltof16chars..$gP3VQ/6X7UUEW3HkBn2w1/Ptq2jxPyzV/"
"cZKmF/wJvD" },
{ "$5$rounds=10$roundstoolow", "the minimum number is still observed",
"$5$rounds=1000$roundstoolow$yfvwcWrQ8l/K0DAWyuPMDNHpIVlTQebY9l/gL97"
"2bIC" },
};
#define ntests2 (sizeof (tests2) / sizeof (tests2[0]))
int main(void) {
struct sha256_ctx ctx;
char sum[32];
int result = 0;
int cnt, i;
char buf[1000];
static const char expected[32] =
"\xcd\xc7\x6e\x5c\x99\x14\xfb\x92\x81\xa1\xc7\xe2\x84\xd7\x3e\x67"
"\xf1\x80\x9a\x48\xa4\x97\x20\x0e\x04\x6d\x39\xcc\xc7\x11\x2c\xd0";
for (cnt = 0; cnt < (int) ntests; ++cnt) {
sha256_init_ctx(&ctx);
sha256_process_bytes(tests[cnt].input, strlen(tests[cnt].input), &ctx);
sha256_finish_ctx(&ctx, sum);
if (memcmp(tests[cnt].result, sum, 32) != 0) {
printf("test %d run %d failed\n", cnt, 1);
result = 1;
}
sha256_init_ctx(&ctx);
for (i = 0; tests[cnt].input[i] != '\0'; ++i) {
sha256_process_bytes(&tests[cnt].input[i], 1, &ctx);
}
sha256_finish_ctx(&ctx, sum);
if (memcmp(tests[cnt].result, sum, 32) != 0) {
printf("test %d run %d failed\n", cnt, 2);
result = 1;
}
}
memset(buf, 'a', sizeof(buf));
sha256_init_ctx(&ctx);
for (i = 0; i < 1000; ++i) {
sha256_process_bytes (buf, sizeof (buf), &ctx);
}
sha256_finish_ctx(&ctx, sum);
if (memcmp(expected, sum, 32) != 0) {
printf("test %d failed\n", cnt);
result = 1;
}
for (cnt = 0; cnt < ntests2; ++cnt) {
char *cp = php_sha256_crypt(tests2[cnt].input, tests2[cnt].salt);
if (strcmp(cp, tests2[cnt].expected) != 0) {
printf("test %d: expected \"%s\", got \"%s\"\n", cnt, tests2[cnt].expected, cp);
result = 1;
}
}
if (result == 0)
puts("all tests OK");
return result;
}
#endif