[fusl] clang-format fusl

fusl/src/crypt/crypt_sha512.c

Index: fusl/src/crypt/crypt_sha512.c
diff --git a/fusl/src/crypt/crypt_sha512.c b/fusl/src/crypt/crypt_sha512.c
index 1294e98be78f5c364e8b744c535bd5d25b43a2f3..9517e837db450e4d4741c0dffdc591b31f4b9265 100644
--- a/fusl/src/crypt/crypt_sha512.c
+++ b/fusl/src/crypt/crypt_sha512.c
@@ -17,173 +17,175 @@
 /* >=2^64 bits messages are not supported (about 2000 peta bytes) */
 
 struct sha512 {
-	uint64_t len;     /* processed message length */
-	uint64_t h[8];    /* hash state */
-	uint8_t buf[128]; /* message block buffer */
+  uint64_t len;     /* processed message length */
+  uint64_t h[8];    /* hash state */
+  uint8_t buf[128]; /* message block buffer */
 };
 
-static uint64_t ror(uint64_t n, int k) { return (n >> k) | (n << (64-k)); }
-#define Ch(x,y,z)  (z ^ (x & (y ^ z)))
-#define Maj(x,y,z) ((x & y) | (z & (x | y)))
-#define S0(x)      (ror(x,28) ^ ror(x,34) ^ ror(x,39))
-#define S1(x)      (ror(x,14) ^ ror(x,18) ^ ror(x,41))
-#define R0(x)      (ror(x,1) ^ ror(x,8) ^ (x>>7))
-#define R1(x)      (ror(x,19) ^ ror(x,61) ^ (x>>6))
+static uint64_t ror(uint64_t n, int k) {
+  return (n >> k) | (n << (64 - k));
+}
+#define Ch(x, y, z) (z ^ (x & (y ^ z)))
+#define Maj(x, y, z) ((x & y) | (z & (x | y)))
+#define S0(x) (ror(x, 28) ^ ror(x, 34) ^ ror(x, 39))
+#define S1(x) (ror(x, 14) ^ ror(x, 18) ^ ror(x, 41))
+#define R0(x) (ror(x, 1) ^ ror(x, 8) ^ (x >> 7))
+#define R1(x) (ror(x, 19) ^ ror(x, 61) ^ (x >> 6))
 
 static const uint64_t K[80] = {
-0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
-0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
-0xd807aa98a3030242ULL, 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
-0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
-0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
-0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
-0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
-0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
-0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
-0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
-0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
-0xd192e819d6ef5218ULL, 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
-0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
-0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
-0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
-0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
-0xca273eceea26619cULL, 0xd186b8c721c0c207ULL, 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
-0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
-0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
-0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
-};
-
-static void processblock(struct sha512 *s, const uint8_t *buf)
-{
-	uint64_t W[80], t1, t2, a, b, c, d, e, f, g, h;
-	int i;
-
-	for (i = 0; i < 16; i++) {
-		W[i] = (uint64_t)buf[8*i]<<56;
-		W[i] |= (uint64_t)buf[8*i+1]<<48;
-		W[i] |= (uint64_t)buf[8*i+2]<<40;
-		W[i] |= (uint64_t)buf[8*i+3]<<32;
-		W[i] |= (uint64_t)buf[8*i+4]<<24;
-		W[i] |= (uint64_t)buf[8*i+5]<<16;
-		W[i] |= (uint64_t)buf[8*i+6]<<8;
-		W[i] |= buf[8*i+7];
-	}
-	for (; i < 80; i++)
-		W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16];
-	a = s->h[0];
-	b = s->h[1];
-	c = s->h[2];
-	d = s->h[3];
-	e = s->h[4];
-	f = s->h[5];
-	g = s->h[6];
-	h = s->h[7];
-	for (i = 0; i < 80; i++) {
-		t1 = h + S1(e) + Ch(e,f,g) + K[i] + W[i];
-		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;
-	}
-	s->h[0] += a;
-	s->h[1] += b;
-	s->h[2] += c;
-	s->h[3] += d;
-	s->h[4] += e;
-	s->h[5] += f;
-	s->h[6] += g;
-	s->h[7] += h;
+    0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
+    0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
+    0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
+    0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
+    0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
+    0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
+    0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
+    0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
+    0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
+    0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
+    0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
+    0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
+    0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
+    0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
+    0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
+    0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
+    0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
+    0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
+    0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
+    0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
+    0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
+    0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
+    0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
+    0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
+    0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
+    0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
+    0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL};
+
+static void processblock(struct sha512* s, const uint8_t* buf) {
+  uint64_t W[80], t1, t2, a, b, c, d, e, f, g, h;
+  int i;
+
+  for (i = 0; i < 16; i++) {
+    W[i] = (uint64_t)buf[8 * i] << 56;
+    W[i] |= (uint64_t)buf[8 * i + 1] << 48;
+    W[i] |= (uint64_t)buf[8 * i + 2] << 40;
+    W[i] |= (uint64_t)buf[8 * i + 3] << 32;
+    W[i] |= (uint64_t)buf[8 * i + 4] << 24;
+    W[i] |= (uint64_t)buf[8 * i + 5] << 16;
+    W[i] |= (uint64_t)buf[8 * i + 6] << 8;
+    W[i] |= buf[8 * i + 7];
+  }
+  for (; i < 80; i++)
+    W[i] = R1(W[i - 2]) + W[i - 7] + R0(W[i - 15]) + W[i - 16];
+  a = s->h[0];
+  b = s->h[1];
+  c = s->h[2];
+  d = s->h[3];
+  e = s->h[4];
+  f = s->h[5];
+  g = s->h[6];
+  h = s->h[7];
+  for (i = 0; i < 80; i++) {
+    t1 = h + S1(e) + Ch(e, f, g) + K[i] + W[i];
+    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;
+  }
+  s->h[0] += a;
+  s->h[1] += b;
+  s->h[2] += c;
+  s->h[3] += d;
+  s->h[4] += e;
+  s->h[5] += f;
+  s->h[6] += g;
+  s->h[7] += h;
 }
 
-static void pad(struct sha512 *s)
-{
-	unsigned r = s->len % 128;
-
-	s->buf[r++] = 0x80;
-	if (r > 112) {
-		memset(s->buf + r, 0, 128 - r);
-		r = 0;
-		processblock(s, s->buf);
-	}
-	memset(s->buf + r, 0, 120 - r);
-	s->len *= 8;
-	s->buf[120] = s->len >> 56;
-	s->buf[121] = s->len >> 48;
-	s->buf[122] = s->len >> 40;
-	s->buf[123] = s->len >> 32;
-	s->buf[124] = s->len >> 24;
-	s->buf[125] = s->len >> 16;
-	s->buf[126] = s->len >> 8;
-	s->buf[127] = s->len;
-	processblock(s, s->buf);
+static void pad(struct sha512* s) {
+  unsigned r = s->len % 128;
+
+  s->buf[r++] = 0x80;
+  if (r > 112) {
+    memset(s->buf + r, 0, 128 - r);
+    r = 0;
+    processblock(s, s->buf);
+  }
+  memset(s->buf + r, 0, 120 - r);
+  s->len *= 8;
+  s->buf[120] = s->len >> 56;
+  s->buf[121] = s->len >> 48;
+  s->buf[122] = s->len >> 40;
+  s->buf[123] = s->len >> 32;
+  s->buf[124] = s->len >> 24;
+  s->buf[125] = s->len >> 16;
+  s->buf[126] = s->len >> 8;
+  s->buf[127] = s->len;
+  processblock(s, s->buf);
 }
 
-static void sha512_init(struct sha512 *s)
-{
-	s->len = 0;
-	s->h[0] = 0x6a09e667f3bcc908ULL;
-	s->h[1] = 0xbb67ae8584caa73bULL;
-	s->h[2] = 0x3c6ef372fe94f82bULL;
-	s->h[3] = 0xa54ff53a5f1d36f1ULL;
-	s->h[4] = 0x510e527fade682d1ULL;
-	s->h[5] = 0x9b05688c2b3e6c1fULL;
-	s->h[6] = 0x1f83d9abfb41bd6bULL;
-	s->h[7] = 0x5be0cd19137e2179ULL;
+static void sha512_init(struct sha512* s) {
+  s->len = 0;
+  s->h[0] = 0x6a09e667f3bcc908ULL;
+  s->h[1] = 0xbb67ae8584caa73bULL;
+  s->h[2] = 0x3c6ef372fe94f82bULL;
+  s->h[3] = 0xa54ff53a5f1d36f1ULL;
+  s->h[4] = 0x510e527fade682d1ULL;
+  s->h[5] = 0x9b05688c2b3e6c1fULL;
+  s->h[6] = 0x1f83d9abfb41bd6bULL;
+  s->h[7] = 0x5be0cd19137e2179ULL;
 }
 
-static void sha512_sum(struct sha512 *s, uint8_t *md)
-{
-	int i;
-
-	pad(s);
-	for (i = 0; i < 8; i++) {
-		md[8*i] = s->h[i] >> 56;
-		md[8*i+1] = s->h[i] >> 48;
-		md[8*i+2] = s->h[i] >> 40;
-		md[8*i+3] = s->h[i] >> 32;
-		md[8*i+4] = s->h[i] >> 24;
-		md[8*i+5] = s->h[i] >> 16;
-		md[8*i+6] = s->h[i] >> 8;
-		md[8*i+7] = s->h[i];
-	}
+static void sha512_sum(struct sha512* s, uint8_t* md) {
+  int i;
+
+  pad(s);
+  for (i = 0; i < 8; i++) {
+    md[8 * i] = s->h[i] >> 56;
+    md[8 * i + 1] = s->h[i] >> 48;
+    md[8 * i + 2] = s->h[i] >> 40;
+    md[8 * i + 3] = s->h[i] >> 32;
+    md[8 * i + 4] = s->h[i] >> 24;
+    md[8 * i + 5] = s->h[i] >> 16;
+    md[8 * i + 6] = s->h[i] >> 8;
+    md[8 * i + 7] = s->h[i];
+  }
 }
 
-static void sha512_update(struct sha512 *s, const void *m, unsigned long len)
-{
-	const uint8_t *p = m;
-	unsigned r = s->len % 128;
-
-	s->len += len;
-	if (r) {
-		if (len < 128 - r) {
-			memcpy(s->buf + r, p, len);
-			return;
-		}
-		memcpy(s->buf + r, p, 128 - r);
-		len -= 128 - r;
-		p += 128 - r;
-		processblock(s, s->buf);
-	}
-	for (; len >= 128; len -= 128, p += 128)
-		processblock(s, p);
-	memcpy(s->buf, p, len);
+static void sha512_update(struct sha512* s, const void* m, unsigned long len) {
+  const uint8_t* p = m;
+  unsigned r = s->len % 128;
+
+  s->len += len;
+  if (r) {
+    if (len < 128 - r) {
+      memcpy(s->buf + r, p, len);
+      return;
+    }
+    memcpy(s->buf + r, p, 128 - r);
+    len -= 128 - r;
+    p += 128 - r;
+    processblock(s, s->buf);
+  }
+  for (; len >= 128; len -= 128, p += 128)
+    processblock(s, p);
+  memcpy(s->buf, p, len);
 }
 
 static const unsigned char b64[] =
-"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
-
-static char *to64(char *s, unsigned int u, int n)
-{
-	while (--n >= 0) {
-		*s++ = b64[u % 64];
-		u /= 64;
-	}
-	return s;
+    "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+static char* to64(char* s, unsigned int u, int n) {
+  while (--n >= 0) {
+    *s++ = b64[u % 64];
+    u /= 64;
+  }
+  return s;
 }
 
 /* key limit is not part of the original design, added for DoS protection.
@@ -196,176 +198,177 @@ static char *to64(char *s, unsigned int u, int n)
 #define ROUNDS_MAX 9999999
 
 /* hash n bytes of the repeated md message digest */
-static void hashmd(struct sha512 *s, unsigned int n, const void *md)
-{
-	unsigned int i;
+static void hashmd(struct sha512* s, unsigned int n, const void* md) {
+  unsigned int i;
 
-	for (i = n; i > 64; i -= 64)
-		sha512_update(s, md, 64);
-	sha512_update(s, md, i);
+  for (i = n; i > 64; i -= 64)
+    sha512_update(s, md, 64);
+  sha512_update(s, md, i);
 }
 
-static char *sha512crypt(const char *key, const char *setting, char *output)
-{
-	struct sha512 ctx;
-	unsigned char md[64], kmd[64], smd[64];
-	unsigned int i, r, klen, slen;
-	char rounds[20] = "";
-	const char *salt;
-	char *p;
-
-	/* reject large keys */
-	for (i = 0; i <= KEY_MAX && key[i]; i++);
-	if (i > KEY_MAX)
-		return 0;
-	klen = i;
-
-	/* setting: $6$rounds=n$salt$ (rounds=n$ and closing $ are optional) */
-	if (strncmp(setting, "$6$", 3) != 0)
-		return 0;
-	salt = setting + 3;
-
-	r = ROUNDS_DEFAULT;
-	if (strncmp(salt, "rounds=", sizeof "rounds=" - 1) == 0) {
-		unsigned long u;
-		char *end;
-
-		/*
-		 * this is a deviation from the reference:
-		 * bad rounds setting is rejected if it is
-		 * - empty
-		 * - unterminated (missing '$')
-		 * - begins with anything but a decimal digit
-		 * the reference implementation treats these bad
-		 * rounds as part of the salt or parse them with
-		 * strtoul semantics which may cause problems
-		 * including non-portable hashes that depend on
-		 * the host's value of ULONG_MAX.
-		 */
-		salt += sizeof "rounds=" - 1;
-		if (!isdigit(*salt))
-			return 0;
-		u = strtoul(salt, &end, 10);
-		if (*end != '$')
-			return 0;
-		salt = end+1;
-		if (u < ROUNDS_MIN)
-			r = ROUNDS_MIN;
-		else if (u > ROUNDS_MAX)
-			r = ROUNDS_MAX;
-		else
-			r = u;
-		/* needed when rounds is zero prefixed or out of bounds */
-		sprintf(rounds, "rounds=%u$", r);
-	}
-
-	for (i = 0; i < SALT_MAX && salt[i] && salt[i] != '$'; i++)
-		/* reject characters that interfere with /etc/shadow parsing */
-		if (salt[i] == '\n' || salt[i] == ':')
-			return 0;
-	slen = i;
-
-	/* B = sha(key salt key) */
-	sha512_init(&ctx);
-	sha512_update(&ctx, key, klen);
-	sha512_update(&ctx, salt, slen);
-	sha512_update(&ctx, key, klen);
-	sha512_sum(&ctx, md);
-
-	/* A = sha(key salt repeat-B alternate-B-key) */
-	sha512_init(&ctx);
-	sha512_update(&ctx, key, klen);
-	sha512_update(&ctx, salt, slen);
-	hashmd(&ctx, klen, md);
-	for (i = klen; i > 0; i >>= 1)
-		if (i & 1)
-			sha512_update(&ctx, md, sizeof md);
-		else
-			sha512_update(&ctx, key, klen);
-	sha512_sum(&ctx, md);
-
-	/* DP = sha(repeat-key), this step takes O(klen^2) time */
-	sha512_init(&ctx);
-	for (i = 0; i < klen; i++)
-		sha512_update(&ctx, key, klen);
-	sha512_sum(&ctx, kmd);
-
-	/* DS = sha(repeat-salt) */
-	sha512_init(&ctx);
-	for (i = 0; i < 16 + md[0]; i++)
-		sha512_update(&ctx, salt, slen);
-	sha512_sum(&ctx, smd);
-
-	/* iterate A = f(A,DP,DS), this step takes O(rounds*klen) time */
-	for (i = 0; i < r; i++) {
-		sha512_init(&ctx);
-		if (i % 2)
-			hashmd(&ctx, klen, kmd);
-		else
-			sha512_update(&ctx, md, sizeof md);
-		if (i % 3)
-			sha512_update(&ctx, smd, slen);
-		if (i % 7)
-			hashmd(&ctx, klen, kmd);
-		if (i % 2)
-			sha512_update(&ctx, md, sizeof md);
-		else
-			hashmd(&ctx, klen, kmd);
-		sha512_sum(&ctx, md);
-	}
-
-	/* output is $6$rounds=n$salt$hash */
-	p = output;
-	p += sprintf(p, "$6$%s%.*s$", rounds, slen, salt);
+static char* sha512crypt(const char* key, const char* setting, char* output) {
+  struct sha512 ctx;
+  unsigned char md[64], kmd[64], smd[64];
+  unsigned int i, r, klen, slen;
+  char rounds[20] = "";
+  const char* salt;
+  char* p;
+
+  /* reject large keys */
+  for (i = 0; i <= KEY_MAX && key[i]; i++)
+    ;
+  if (i > KEY_MAX)
+    return 0;
+  klen = i;
+
+  /* setting: $6$rounds=n$salt$ (rounds=n$ and closing $ are optional) */
+  if (strncmp(setting, "$6$", 3) != 0)
+    return 0;
+  salt = setting + 3;
+
+  r = ROUNDS_DEFAULT;
+  if (strncmp(salt, "rounds=", sizeof "rounds=" - 1) == 0) {
+    unsigned long u;
+    char* end;
+
+    /*
+     * this is a deviation from the reference:
+     * bad rounds setting is rejected if it is
+     * - empty
+     * - unterminated (missing '$')
+     * - begins with anything but a decimal digit
+     * the reference implementation treats these bad
+     * rounds as part of the salt or parse them with
+     * strtoul semantics which may cause problems
+     * including non-portable hashes that depend on
+     * the host's value of ULONG_MAX.
+     */
+    salt += sizeof "rounds=" - 1;
+    if (!isdigit(*salt))
+      return 0;
+    u = strtoul(salt, &end, 10);
+    if (*end != '$')
+      return 0;
+    salt = end + 1;
+    if (u < ROUNDS_MIN)
+      r = ROUNDS_MIN;
+    else if (u > ROUNDS_MAX)
+      r = ROUNDS_MAX;
+    else
+      r = u;
+    /* needed when rounds is zero prefixed or out of bounds */
+    sprintf(rounds, "rounds=%u$", r);
+  }
+
+  for (i = 0; i < SALT_MAX && salt[i] && salt[i] != '$'; i++)
+    /* reject characters that interfere with /etc/shadow parsing */
+    if (salt[i] == '\n' || salt[i] == ':')
+      return 0;
+  slen = i;
+
+  /* B = sha(key salt key) */
+  sha512_init(&ctx);
+  sha512_update(&ctx, key, klen);
+  sha512_update(&ctx, salt, slen);
+  sha512_update(&ctx, key, klen);
+  sha512_sum(&ctx, md);
+
+  /* A = sha(key salt repeat-B alternate-B-key) */
+  sha512_init(&ctx);
+  sha512_update(&ctx, key, klen);
+  sha512_update(&ctx, salt, slen);
+  hashmd(&ctx, klen, md);
+  for (i = klen; i > 0; i >>= 1)
+    if (i & 1)
+      sha512_update(&ctx, md, sizeof md);
+    else
+      sha512_update(&ctx, key, klen);
+  sha512_sum(&ctx, md);
+
+  /* DP = sha(repeat-key), this step takes O(klen^2) time */
+  sha512_init(&ctx);
+  for (i = 0; i < klen; i++)
+    sha512_update(&ctx, key, klen);
+  sha512_sum(&ctx, kmd);
+
+  /* DS = sha(repeat-salt) */
+  sha512_init(&ctx);
+  for (i = 0; i < 16 + md[0]; i++)
+    sha512_update(&ctx, salt, slen);
+  sha512_sum(&ctx, smd);
+
+  /* iterate A = f(A,DP,DS), this step takes O(rounds*klen) time */
+  for (i = 0; i < r; i++) {
+    sha512_init(&ctx);
+    if (i % 2)
+      hashmd(&ctx, klen, kmd);
+    else
+      sha512_update(&ctx, md, sizeof md);
+    if (i % 3)
+      sha512_update(&ctx, smd, slen);
+    if (i % 7)
+      hashmd(&ctx, klen, kmd);
+    if (i % 2)
+      sha512_update(&ctx, md, sizeof md);
+    else
+      hashmd(&ctx, klen, kmd);
+    sha512_sum(&ctx, md);
+  }
+
+  /* output is $6$rounds=n$salt$hash */
+  p = output;
+  p += sprintf(p, "$6$%s%.*s$", rounds, slen, salt);
 #if 1
-	static const unsigned char perm[][3] = {
-		0,21,42,22,43,1,44,2,23,3,24,45,25,46,4,
-		47,5,26,6,27,48,28,49,7,50,8,29,9,30,51,
-		31,52,10,53,11,32,12,33,54,34,55,13,56,14,35,
-		15,36,57,37,58,16,59,17,38,18,39,60,40,61,19,
-		62,20,41 };
-	for (i=0; i<21; i++) p = to64(p,
-		(md[perm[i][0]]<<16)|(md[perm[i][1]]<<8)|md[perm[i][2]], 4);
+  static const unsigned char perm[][3] = {
+      0,  21, 42, 22, 43, 1,  44, 2,  23, 3,  24, 45, 25, 46, 4,  47,
+      5,  26, 6,  27, 48, 28, 49, 7,  50, 8,  29, 9,  30, 51, 31, 52,
+      10, 53, 11, 32, 12, 33, 54, 34, 55, 13, 56, 14, 35, 15, 36, 57,
+      37, 58, 16, 59, 17, 38, 18, 39, 60, 40, 61, 19, 62, 20, 41};
+  for (i = 0; i < 21; i++)
+    p = to64(p, (md[perm[i][0]] << 16) | (md[perm[i][1]] << 8) | md[perm[i][2]],
+             4);
 #else
-	p = to64(p, (md[0]<<16)|(md[21]<<8)|md[42], 4);
-	p = to64(p, (md[22]<<16)|(md[43]<<8)|md[1], 4);
-	p = to64(p, (md[44]<<16)|(md[2]<<8)|md[23], 4);
-	p = to64(p, (md[3]<<16)|(md[24]<<8)|md[45], 4);
-	p = to64(p, (md[25]<<16)|(md[46]<<8)|md[4], 4);
-	p = to64(p, (md[47]<<16)|(md[5]<<8)|md[26], 4);
-	p = to64(p, (md[6]<<16)|(md[27]<<8)|md[48], 4);
-	p = to64(p, (md[28]<<16)|(md[49]<<8)|md[7], 4);
-	p = to64(p, (md[50]<<16)|(md[8]<<8)|md[29], 4);
-	p = to64(p, (md[9]<<16)|(md[30]<<8)|md[51], 4);
-	p = to64(p, (md[31]<<16)|(md[52]<<8)|md[10], 4);
-	p = to64(p, (md[53]<<16)|(md[11]<<8)|md[32], 4);
-	p = to64(p, (md[12]<<16)|(md[33]<<8)|md[54], 4);
-	p = to64(p, (md[34]<<16)|(md[55]<<8)|md[13], 4);
-	p = to64(p, (md[56]<<16)|(md[14]<<8)|md[35], 4);
-	p = to64(p, (md[15]<<16)|(md[36]<<8)|md[57], 4);
-	p = to64(p, (md[37]<<16)|(md[58]<<8)|md[16], 4);
-	p = to64(p, (md[59]<<16)|(md[17]<<8)|md[38], 4);
-	p = to64(p, (md[18]<<16)|(md[39]<<8)|md[60], 4);
-	p = to64(p, (md[40]<<16)|(md[61]<<8)|md[19], 4);
-	p = to64(p, (md[62]<<16)|(md[20]<<8)|md[41], 4);
+  p = to64(p, (md[0] << 16) | (md[21] << 8) | md[42], 4);
+  p = to64(p, (md[22] << 16) | (md[43] << 8) | md[1], 4);
+  p = to64(p, (md[44] << 16) | (md[2] << 8) | md[23], 4);
+  p = to64(p, (md[3] << 16) | (md[24] << 8) | md[45], 4);
+  p = to64(p, (md[25] << 16) | (md[46] << 8) | md[4], 4);
+  p = to64(p, (md[47] << 16) | (md[5] << 8) | md[26], 4);
+  p = to64(p, (md[6] << 16) | (md[27] << 8) | md[48], 4);
+  p = to64(p, (md[28] << 16) | (md[49] << 8) | md[7], 4);
+  p = to64(p, (md[50] << 16) | (md[8] << 8) | md[29], 4);
+  p = to64(p, (md[9] << 16) | (md[30] << 8) | md[51], 4);
+  p = to64(p, (md[31] << 16) | (md[52] << 8) | md[10], 4);
+  p = to64(p, (md[53] << 16) | (md[11] << 8) | md[32], 4);
+  p = to64(p, (md[12] << 16) | (md[33] << 8) | md[54], 4);
+  p = to64(p, (md[34] << 16) | (md[55] << 8) | md[13], 4);
+  p = to64(p, (md[56] << 16) | (md[14] << 8) | md[35], 4);
+  p = to64(p, (md[15] << 16) | (md[36] << 8) | md[57], 4);
+  p = to64(p, (md[37] << 16) | (md[58] << 8) | md[16], 4);
+  p = to64(p, (md[59] << 16) | (md[17] << 8) | md[38], 4);
+  p = to64(p, (md[18] << 16) | (md[39] << 8) | md[60], 4);
+  p = to64(p, (md[40] << 16) | (md[61] << 8) | md[19], 4);
+  p = to64(p, (md[62] << 16) | (md[20] << 8) | md[41], 4);
 #endif
-	p = to64(p, md[63], 2);
-	*p = 0;
-	return output;
+  p = to64(p, md[63], 2);
+  *p = 0;
+  return output;
 }
 
-char *__crypt_sha512(const char *key, const char *setting, char *output)
-{
-	static const char testkey[] = "Xy01@#\x01\x02\x80\x7f\xff\r\n\x81\t !";
-	static const char testsetting[] = "$6$rounds=1234$abc0123456789$";
-	static const char testhash[] = "$6$rounds=1234$abc0123456789$BCpt8zLrc/RcyuXmCDOE1ALqMXB2MH6n1g891HhFj8.w7LxGv.FTkqq6Vxc/km3Y0jE0j24jY5PIv/oOu6reg1";
-	char testbuf[128];
-	char *p, *q;
-
-	p = sha512crypt(key, setting, output);
-	/* self test and stack cleanup */
-	q = sha512crypt(testkey, testsetting, testbuf);
-	if (!p || q != testbuf || memcmp(testbuf, testhash, sizeof testhash))
-		return "*";
-	return p;
+char* __crypt_sha512(const char* key, const char* setting, char* output) {
+  static const char testkey[] = "Xy01@#\x01\x02\x80\x7f\xff\r\n\x81\t !";
+  static const char testsetting[] = "$6$rounds=1234$abc0123456789$";
+  static const char testhash[] =
+      "$6$rounds=1234$abc0123456789$BCpt8zLrc/"
+      "RcyuXmCDOE1ALqMXB2MH6n1g891HhFj8.w7LxGv.FTkqq6Vxc/km3Y0jE0j24jY5PIv/"
+      "oOu6reg1";
+  char testbuf[128];
+  char *p, *q;
+
+  p = sha512crypt(key, setting, output);
+  /* self test and stack cleanup */
+  q = sha512crypt(testkey, testsetting, testbuf);
+  if (!p || q != testbuf || memcmp(testbuf, testhash, sizeof testhash))
+    return "*";
+  return p;
 }