/* vi: set sw=4 ts=4: */
/*
- * Based on shasum from http://www.netsw.org/crypto/hash/
- * Majorly hacked up to use Dr Brian Gladman's sha1 code
+ * Based on shasum from http://www.netsw.org/crypto/hash/
+ * Majorly hacked up to use Dr Brian Gladman's sha1 code
*
- * Copyright (C) 2002 Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK.
- * Copyright (C) 2003 Glenn L. McGrath
- * Copyright (C) 2003 Erik Andersen
+ * Copyright (C) 2002 Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK.
+ * Copyright (C) 2003 Glenn L. McGrath
+ * Copyright (C) 2003 Erik Andersen
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
- * ---------------------------------------------------------------------------
- * Issue Date: 10/11/2002
+ * ---------------------------------------------------------------------------
+ * Issue Date: 10/11/2002
*
- * This is a byte oriented version of SHA1 that operates on arrays of bytes
- * stored in memory. It runs at 22 cycles per byte on a Pentium P4 processor
+ * This is a byte oriented version of SHA1 that operates on arrays of bytes
+ * stored in memory. It runs at 22 cycles per byte on a Pentium P4 processor
+ *
+ * ---------------------------------------------------------------------------
+ *
+ * SHA256 and SHA512 parts are:
+ * Released into the Public Domain by Ulrich Drepper <drepper@redhat.com>.
+ * TODO: shrink them.
*/
#include "libbb.h"
+#define rotl32(x,n) (((x) << (n)) | ((x) >> (32 - (n))))
+#define rotr32(x,n) (((x) >> (n)) | ((x) << (32 - (n))))
+/* for sha512: */
+#define rotr64(x,n) (((x) >> (n)) | ((x) << (64 - (n))))
+#if BB_LITTLE_ENDIAN
+static inline uint64_t hton64(uint64_t v)
+{
+ return (((uint64_t)htonl(v)) << 32) | htonl(v >> 32);
+}
+#else
+#define hton64(v) (v)
+#endif
+#define ntoh64(v) hton64(v)
+
+/* To check alignment gcc has an appropriate operator. Other
+ compilers don't. */
+#if defined(__GNUC__) && __GNUC__ >= 2
+# define UNALIGNED_P(p,type) (((uintptr_t) p) % __alignof__(type) != 0)
+#else
+# define UNALIGNED_P(p,type) (((uintptr_t) p) % sizeof(type) != 0)
+#endif
+
+
#define SHA1_BLOCK_SIZE 64
#define SHA1_DIGEST_SIZE 20
#define SHA1_HASH_SIZE SHA1_DIGEST_SIZE
#define SHA1_MASK (SHA1_BLOCK_SIZE - 1)
-#define rotl32(x,n) (((x) << n) | ((x) >> (32 - n)))
-
-/* Reverse byte order in 32-bit words */
-#define ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
-#define parity(x,y,z) ((x) ^ (y) ^ (z))
-#define maj(x,y,z) (((x) & (y)) | ((z) & ((x) | (y))))
-
-/* A normal version as set out in the FIPS. This version uses */
-/* partial loop unrolling and is optimised for the Pentium 4 */
-#define rnd(f,k) \
- do { \
- t = a; a = rotl32(a,5) + f(b,c,d) + e + k + w[i]; \
- e = d; d = c; c = rotl32(b, 30); b = t; \
- } while (0)
-
static void sha1_compile(sha1_ctx_t *ctx)
{
uint32_t w[80], i, a, b, c, d, e, t;
/* words in big-endian order so an order reversal is needed */
/* here on little endian machines */
for (i = 0; i < SHA1_BLOCK_SIZE / 4; ++i)
- w[i] = htonl(ctx->wbuf[i]);
+ w[i] = ntohl(ctx->wbuf[i]);
- for (i = SHA1_BLOCK_SIZE / 4; i < 80; ++i)
- w[i] = rotl32(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1);
+ for (/*i = SHA1_BLOCK_SIZE / 4*/; i < 80; ++i) {
+ t = w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16];
+ w[i] = rotl32(t, 1);
+ }
a = ctx->hash[0];
b = ctx->hash[1];
d = ctx->hash[3];
e = ctx->hash[4];
+/* Reverse byte order in 32-bit words */
+#define ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
+#define parity(x,y,z) ((x) ^ (y) ^ (z))
+#define maj(x,y,z) (((x) & (y)) | ((z) & ((x) | (y))))
+/* A normal version as set out in the FIPS. This version uses */
+/* partial loop unrolling and is optimised for the Pentium 4 */
+#define rnd(f,k) \
+ do { \
+ t = a; a = rotl32(a,5) + f(b,c,d) + e + k + w[i]; \
+ e = d; d = c; c = rotl32(b, 30); b = t; \
+ } while (0)
+
for (i = 0; i < 20; ++i)
rnd(ch, 0x5a827999);
for (i = 60; i < 80; ++i)
rnd(parity, 0xca62c1d6);
+#undef ch
+#undef parity
+#undef maj
+#undef rnd
ctx->hash[0] += a;
ctx->hash[1] += b;
ctx->hash[4] += e;
}
+/* Process LEN bytes of BUFFER, accumulating context into CTX.
+ It is assumed that LEN % 64 == 0. */
+static void sha256_process_block(const void *buffer, size_t len, sha256_ctx_t *ctx)
+{
+ /* Constants for SHA256 from FIPS 180-2:4.2.2. */
+ 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
+ };
+ const uint32_t *words = buffer;
+ size_t nwords = len / sizeof(uint32_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];
+
+ /* First increment the byte count. FIPS 180-2 specifies the possible
+ length of the file up to 2^64 bits. Here we only compute the
+ number of bytes. Do a double word increment. */
+ ctx->total[0] += len;
+ if (ctx->total[0] < len)
+ ctx->total[1]++;
+
+ /* Process all bytes in the buffer with 64 bytes in each round of
+ the loop. */
+ 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;
+
+ /* Operators defined in FIPS 180-2:4.1.2. */
+#define Ch(x, y, z) ((x & y) ^ (~x & z))
+#define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
+#define S0(x) (rotr32(x, 2) ^ rotr32(x, 13) ^ rotr32(x, 22))
+#define S1(x) (rotr32(x, 6) ^ rotr32(x, 11) ^ rotr32(x, 25))
+#define R0(x) (rotr32(x, 7) ^ rotr32(x, 18) ^ (x >> 3))
+#define R1(x) (rotr32(x, 17) ^ rotr32(x, 19) ^ (x >> 10))
+
+ /* Compute the message schedule according to FIPS 180-2:6.2.2 step 2. */
+ for (unsigned t = 0; t < 16; ++t) {
+ W[t] = ntohl(*words);
+ ++words;
+ }
+ for (unsigned t = 16; t < 64; ++t)
+ W[t] = R1(W[t - 2]) + W[t - 7] + R0(W[t - 15]) + W[t - 16];
+
+ /* The actual computation according to FIPS 180-2:6.2.2 step 3. */
+ for (unsigned 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;
+ }
+#undef Ch
+#undef Maj
+#undef S0
+#undef S1
+#undef R0
+#undef R1
+ /* Add the starting values of the context according to FIPS 180-2:6.2.2
+ step 4. */
+ a += a_save;
+ b += b_save;
+ c += c_save;
+ d += d_save;
+ e += e_save;
+ f += f_save;
+ g += g_save;
+ h += h_save;
+
+ /* Prepare for the next round. */
+ nwords -= 16;
+ }
+
+ /* Put checksum in context given as argument. */
+ 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;
+}
+
+/* Process LEN bytes of BUFFER, accumulating context into CTX.
+ It is assumed that LEN % 128 == 0. */
+static void sha512_process_block(const void *buffer, size_t len, sha512_ctx_t *ctx)
+{
+ /* Constants for SHA512 from FIPS 180-2:4.2.3. */
+ 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,
+ };
+ const uint64_t *words = buffer;
+ size_t nwords = len / sizeof(uint64_t);
+ uint64_t a = ctx->H[0];
+ uint64_t b = ctx->H[1];
+ uint64_t c = ctx->H[2];
+ uint64_t d = ctx->H[3];
+ uint64_t e = ctx->H[4];
+ uint64_t f = ctx->H[5];
+ uint64_t g = ctx->H[6];
+ uint64_t h = ctx->H[7];
+
+ /* First increment the byte count. FIPS 180-2 specifies the possible
+ length of the file up to 2^128 bits. Here we only compute the
+ number of bytes. Do a double word increment. */
+ ctx->total[0] += len;
+ if (ctx->total[0] < len)
+ ctx->total[1]++;
+
+ /* Process all bytes in the buffer with 128 bytes in each round of
+ the loop. */
+ while (nwords > 0) {
+ uint64_t W[80];
+ uint64_t a_save = a;
+ uint64_t b_save = b;
+ uint64_t c_save = c;
+ uint64_t d_save = d;
+ uint64_t e_save = e;
+ uint64_t f_save = f;
+ uint64_t g_save = g;
+ uint64_t h_save = h;
+
+ /* Operators defined in FIPS 180-2:4.1.2. */
+#define Ch(x, y, z) ((x & y) ^ (~x & z))
+#define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
+#define S0(x) (rotr64(x, 28) ^ rotr64(x, 34) ^ rotr64(x, 39))
+#define S1(x) (rotr64(x, 14) ^ rotr64(x, 18) ^ rotr64(x, 41))
+#define R0(x) (rotr64(x, 1) ^ rotr64(x, 8) ^ (x >> 7))
+#define R1(x) (rotr64(x, 19) ^ rotr64(x, 61) ^ (x >> 6))
+
+ /* Compute the message schedule according to FIPS 180-2:6.3.2 step 2. */
+ for (unsigned t = 0; t < 16; ++t) {
+ W[t] = ntoh64(*words);
+ ++words;
+ }
+ for (unsigned t = 16; t < 80; ++t)
+ W[t] = R1(W[t - 2]) + W[t - 7] + R0(W[t - 15]) + W[t - 16];
+
+ /* The actual computation according to FIPS 180-2:6.3.2 step 3. */
+ for (unsigned t = 0; t < 80; ++t) {
+ uint64_t T1 = h + S1(e) + Ch(e, f, g) + K[t] + W[t];
+ uint64_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;
+ }
+#undef Ch
+#undef Maj
+#undef S0
+#undef S1
+#undef R0
+#undef R1
+ /* Add the starting values of the context according to FIPS 180-2:6.3.2
+ step 4. */
+ a += a_save;
+ b += b_save;
+ c += c_save;
+ d += d_save;
+ e += e_save;
+ f += f_save;
+ g += g_save;
+ h += h_save;
+
+ /* Prepare for the next round. */
+ nwords -= 16;
+ }
+
+ /* Put checksum in context given as argument. */
+ 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;
+}
+
+
void FAST_FUNC sha1_begin(sha1_ctx_t *ctx)
{
ctx->count[0] = ctx->count[1] = 0;
ctx->hash[4] = 0xc3d2e1f0;
}
+/* Initialize structure containing state of computation.
+ (FIPS 180-2:5.3.2) */
+void FAST_FUNC sha256_begin(sha256_ctx_t *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;
+}
+
+/* Initialize structure containing state of computation.
+ (FIPS 180-2:5.3.3) */
+void FAST_FUNC sha512_begin(sha512_ctx_t *ctx)
+{
+ ctx->H[0] = 0x6a09e667f3bcc908ULL;
+ ctx->H[1] = 0xbb67ae8584caa73bULL;
+ ctx->H[2] = 0x3c6ef372fe94f82bULL;
+ ctx->H[3] = 0xa54ff53a5f1d36f1ULL;
+ ctx->H[4] = 0x510e527fade682d1ULL;
+ ctx->H[5] = 0x9b05688c2b3e6c1fULL;
+ ctx->H[6] = 0x1f83d9abfb41bd6bULL;
+ ctx->H[7] = 0x5be0cd19137e2179ULL;
+ ctx->total[0] = ctx->total[1] = 0;
+ ctx->buflen = 0;
+}
+
+
/* SHA1 hash data in an array of bytes into hash buffer and call the */
/* hash_compile function as required. */
void FAST_FUNC sha1_hash(const void *data, size_t length, sha1_ctx_t *ctx)
uint32_t freeb = SHA1_BLOCK_SIZE - pos;
const unsigned char *sp = data;
- if ((ctx->count[0] += length) < length)
+ ctx->count[0] += length;
+ if (ctx->count[0] < length)
ctx->count[1]++;
while (length >= freeb) { /* transfer whole blocks while possible */
memcpy(((unsigned char *) ctx->wbuf) + pos, sp, length);
}
+void FAST_FUNC sha256_hash(const void *buffer, size_t len, sha256_ctx_t *ctx)
+{
+ /* When we already have some bits in our internal buffer concatenate
+ both inputs first. */
+ 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;
+ /* The regions in the following copy operation cannot overlap. */
+ memcpy(ctx->buffer,
+ &ctx->buffer[(left_over + add) & ~63],
+ ctx->buflen);
+ }
+
+ buffer = (const char *)buffer + add;
+ len -= add;
+ }
+
+ /* Process available complete blocks. */
+ if (len >= 64) {
+ if (UNALIGNED_P(buffer, uint32_t)) {
+ 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;
+ }
+ }
+
+ /* Move remaining bytes into internal buffer. */
+ 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;
+ }
+}
+
+void FAST_FUNC sha512_hash(const void *buffer, size_t len, sha512_ctx_t *ctx)
+{
+ /* When we already have some bits in our internal buffer concatenate
+ both inputs first. */
+ if (ctx->buflen != 0) {
+ size_t left_over = ctx->buflen;
+ size_t add = 256 - left_over > len ? len : 256 - left_over;
+
+ memcpy(&ctx->buffer[left_over], buffer, add);
+ ctx->buflen += add;
+
+ if (ctx->buflen > 128) {
+ sha512_process_block(ctx->buffer, ctx->buflen & ~127, ctx);
+
+ ctx->buflen &= 127;
+ /* The regions in the following copy operation cannot overlap. */
+ memcpy(ctx->buffer,
+ &ctx->buffer[(left_over + add) & ~127],
+ ctx->buflen);
+ }
+
+ buffer = (const char *)buffer + add;
+ len -= add;
+ }
+
+ /* Process available complete blocks. */
+ if (len >= 128) {
+// #if BB_ARCH_REQUIRES_ALIGNMENT
+ if (UNALIGNED_P(buffer, uint64_t)) {
+ while (len > 128) {
+ sha512_process_block(memcpy(ctx->buffer, buffer, 128),
+ 128, ctx);
+ buffer = (const char *)buffer + 128;
+ len -= 128;
+ }
+ } else
+// #endif
+ {
+ sha512_process_block(buffer, len & ~127, ctx);
+ buffer = (const char *)buffer + (len & ~127);
+ len &= 127;
+ }
+ }
+
+ /* Move remaining bytes into internal buffer. */
+ if (len > 0) {
+ size_t left_over = ctx->buflen;
+
+ memcpy(&ctx->buffer[left_over], buffer, len);
+ left_over += len;
+ if (left_over >= 128) {
+ sha512_process_block(ctx->buffer, 128, ctx);
+ left_over -= 128;
+ memcpy(ctx->buffer, &ctx->buffer[128], left_over);
+ }
+ ctx->buflen = left_over;
+ }
+}
+
+
void* FAST_FUNC sha1_end(void *resbuf, sha1_ctx_t *ctx)
{
/* SHA1 Final padding and digest calculation */
return resbuf;
}
+
+
+/* Process the remaining bytes in the internal buffer and the usual
+ prolog according to the standard and write the result to RESBUF.
+
+ IMPORTANT: On some systems it is required that RESBUF is correctly
+ aligned for a 32 bits value. */
+void* FAST_FUNC sha256_end(void *resbuf, sha256_ctx_t *ctx)
+{
+ /* Take yet unprocessed bytes into account. */
+ uint32_t bytes = ctx->buflen;
+ size_t pad;
+
+ /* Now count remaining bytes. */
+ ctx->total[0] += bytes;
+ if (ctx->total[0] < bytes)
+ ctx->total[1]++;
+
+ /* Pad the buffer to the next 64-byte boundary with 0x80,0,0,0...
+ (FIPS 180-2:5.1.1) */
+ pad = (bytes >= 56 ? 64 + 56 - bytes : 56 - bytes);
+ memset(&ctx->buffer[bytes], 0, pad);
+ ctx->buffer[bytes] = 0x80;
+
+ /* Put the 64-bit file length in *bits* at the end of the buffer. */
+ *(uint32_t *) &ctx->buffer[bytes + pad + 4] = ntohl(ctx->total[0] << 3);
+ *(uint32_t *) &ctx->buffer[bytes + pad] = ntohl((ctx->total[1] << 3) | (ctx->total[0] >> 29));
+
+ /* Process last bytes. */
+ sha256_process_block(ctx->buffer, bytes + pad + 8, ctx);
+
+ /* Put result from CTX in first 32 bytes following RESBUF. */
+ for (unsigned i = 0; i < 8; ++i)
+ ((uint32_t *) resbuf)[i] = ntohl(ctx->H[i]);
+
+ return resbuf;
+}
+
+/* Process the remaining bytes in the internal buffer and the usual
+ prolog according to the standard and write the result to RESBUF.
+
+ IMPORTANT: On some systems it is required that RESBUF is correctly
+ aligned for a 64 bits value. */
+void* FAST_FUNC sha512_end(void *resbuf, sha512_ctx_t *ctx)
+{
+ /* Take yet unprocessed bytes into account. */
+ uint64_t bytes = ctx->buflen;
+ size_t pad;
+
+ /* Now count remaining bytes. */
+ ctx->total[0] += bytes;
+ if (ctx->total[0] < bytes)
+ ctx->total[1]++;
+
+ /* Pad the buffer to the next 128-byte boundary with 0x80,0,0,0...
+ (FIPS 180-2:5.1.2) */
+ pad = bytes >= 112 ? 128 + 112 - bytes : 112 - bytes;
+ memset(&ctx->buffer[bytes], 0, pad);
+ ctx->buffer[bytes] = 0x80;
+
+ /* Put the 128-bit file length in *bits* at the end of the buffer. */
+ *(uint64_t *) &ctx->buffer[bytes + pad + 8] = hton64(ctx->total[0] << 3);
+ *(uint64_t *) &ctx->buffer[bytes + pad] = hton64((ctx->total[1] << 3) | (ctx->total[0] >> 61));
+
+ /* Process last bytes. */
+ sha512_process_block(ctx->buffer, bytes + pad + 16, ctx);
+
+ /* Put result from CTX in first 64 bytes following RESBUF. */
+ for (unsigned i = 0; i < 8; ++i)
+ ((uint64_t *) resbuf)[i] = hton64(ctx->H[i]);
+
+ return resbuf;
+}
projects / oweals / busybox.git / commitdiff