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-rw-r--r--libbb/sha1.c290
1 files changed, 88 insertions, 202 deletions
diff --git a/libbb/sha1.c b/libbb/sha1.c
index efdb0f58e..8ecf71a9d 100644
--- a/libbb/sha1.c
+++ b/libbb/sha1.c
@@ -203,9 +203,10 @@ static const uint32_t K512_lo[80] = {
/* Process LEN bytes of BUFFER, accumulating context into CTX.
LEN is rounded _down_ to 64. */
-static void sha256_process_block64(const void *buffer, size_t len, sha256_ctx_t *ctx)
+static void sha256_process_block64(sha256_ctx_t *ctx)
{
- const uint32_t *words = buffer;
+ unsigned t;
+ uint32_t W[64];
uint32_t a = ctx->hash[0];
uint32_t b = ctx->hash[1];
uint32_t c = ctx->hash[2];
@@ -214,15 +215,9 @@ static void sha256_process_block64(const void *buffer, size_t len, sha256_ctx_t
uint32_t f = ctx->hash[5];
uint32_t g = ctx->hash[6];
uint32_t h = ctx->hash[7];
+ const uint32_t *words = (uint32_t*) ctx->wbuffer;
- /* Process all bytes in the buffer with 64 bytes in each round of
- the loop. */
- len /= (sizeof(uint32_t) * 16);
- while (len) {
- unsigned t;
- uint32_t W[64];
-
- /* Operators defined in FIPS 180-2:4.1.2. */
+ /* 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))
@@ -230,54 +225,51 @@ static void sha256_process_block64(const void *buffer, size_t len, sha256_ctx_t
#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 (t = 0; t < 16; ++t) {
- W[t] = ntohl(*words);
- words++;
- }
+ /* Compute the message schedule according to FIPS 180-2:6.2.2 step 2. */
+ for (t = 0; t < 16; ++t) {
+ W[t] = ntohl(*words);
+ words++;
+ }
- for (/*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 (t = 0; t < 64; ++t) {
- uint32_t T1 = h + S1(e) + Ch(e, f, g) + K256[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;
- }
+ for (/*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 (t = 0; t < 64; ++t) {
+ uint32_t T1 = h + S1(e) + Ch(e, f, g) + K256[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. */
- ctx->hash[0] = a += ctx->hash[0];
- ctx->hash[1] = b += ctx->hash[1];
- ctx->hash[2] = c += ctx->hash[2];
- ctx->hash[3] = d += ctx->hash[3];
- ctx->hash[4] = e += ctx->hash[4];
- ctx->hash[5] = f += ctx->hash[5];
- ctx->hash[6] = g += ctx->hash[6];
- ctx->hash[7] = h += ctx->hash[7];
-
- /* Prepare for the next round. */
- len--;
- }
+ /* Add the starting values of the context according to FIPS 180-2:6.2.2
+ step 4. */
+ ctx->hash[0] += a;
+ ctx->hash[1] += b;
+ ctx->hash[2] += c;
+ ctx->hash[3] += d;
+ ctx->hash[4] += e;
+ ctx->hash[5] += f;
+ ctx->hash[6] += g;
+ ctx->hash[7] += h;
}
/* Process LEN bytes of BUFFER, accumulating context into CTX.
LEN is rounded _down_ to 128. */
-static void sha512_process_block128(const void *buffer, size_t len, sha512_ctx_t *ctx)
+static void sha512_process_block128(sha512_ctx_t *ctx)
{
- const uint64_t *words = buffer;
+ unsigned t;
+ uint64_t W[80];
uint64_t a = ctx->hash[0];
uint64_t b = ctx->hash[1];
uint64_t c = ctx->hash[2];
@@ -286,13 +278,9 @@ static void sha512_process_block128(const void *buffer, size_t len, sha512_ctx_t
uint64_t f = ctx->hash[5];
uint64_t g = ctx->hash[6];
uint64_t h = ctx->hash[7];
+ const uint32_t *words = (uint32_t*) ctx->wbuffer;
- len /= (sizeof(uint64_t) * 16);
- while (len) {
- unsigned t;
- uint64_t W[80];
-
- /* Operators defined in FIPS 180-2:4.1.2. */
+ /* 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))
@@ -300,58 +288,56 @@ static void sha512_process_block128(const void *buffer, size_t len, sha512_ctx_t
#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 (t = 0; t < 16; ++t) {
- W[t] = ntoh64(*words);
- words++;
- }
- for (/*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 (t = 0; t < 80; ++t) {
- uint64_t K512_t = ((uint64_t)(K256[t]) << 32) + K512_lo[t];
- uint64_t T1 = h + S1(e) + Ch(e, f, g) + K512_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;
- }
+ /* Compute the message schedule according to FIPS 180-2:6.3.2 step 2. */
+ for (t = 0; t < 16; ++t) {
+ W[t] = ntoh64(*words);
+ words++;
+ }
+ for (/*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 (t = 0; t < 80; ++t) {
+ uint64_t K512_t = ((uint64_t)(K256[t]) << 32) + K512_lo[t];
+ uint64_t T1 = h + S1(e) + Ch(e, f, g) + K512_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. */
- ctx->hash[0] = a += ctx->hash[0];
- ctx->hash[1] = b += ctx->hash[1];
- ctx->hash[2] = c += ctx->hash[2];
- ctx->hash[3] = d += ctx->hash[3];
- ctx->hash[4] = e += ctx->hash[4];
- ctx->hash[5] = f += ctx->hash[5];
- ctx->hash[6] = g += ctx->hash[6];
- ctx->hash[7] = h += ctx->hash[7];
-
- len--;
- }
+ /* Add the starting values of the context according to FIPS 180-2:6.3.2
+ step 4. */
+ ctx->hash[0] += a;
+ ctx->hash[1] += b;
+ ctx->hash[2] += c;
+ ctx->hash[3] += d;
+ ctx->hash[4] += e;
+ ctx->hash[5] += f;
+ ctx->hash[6] += g;
+ ctx->hash[7] += h;
}
void FAST_FUNC sha1_begin(sha1_ctx_t *ctx)
{
- ctx->total64 = 0;
ctx->hash[0] = 0x67452301;
ctx->hash[1] = 0xefcdab89;
ctx->hash[2] = 0x98badcfe;
ctx->hash[3] = 0x10325476;
ctx->hash[4] = 0xc3d2e1f0;
+ ctx->total64 = 0;
+ ctx->process_block = sha1_process_block64;
}
static const uint32_t init256[] = {
@@ -380,6 +366,7 @@ void FAST_FUNC sha256_begin(sha256_ctx_t *ctx)
{
memcpy(ctx->hash, init256, sizeof(init256));
ctx->total64 = 0;
+ ctx->process_block = sha256_process_block64;
}
/* Initialize structure containing state of computation.
(FIPS 180-2:5.3.3) */
@@ -405,64 +392,16 @@ void FAST_FUNC sha1_hash(const void *buffer, size_t len, sha1_ctx_t *ctx)
len -= add;
add = SHA1_BLOCK_SIZE;
in_buf = 0;
- sha1_process_block64(ctx);
+ ctx->process_block(ctx);
}
memcpy(ctx->wbuffer + in_buf, buffer, len);
}
-void FAST_FUNC sha256_hash(const void *buffer, size_t len, sha256_ctx_t *ctx)
-{
- unsigned in_buf = ctx->total64 & 63;
-
- /* First increment the byte count. FIPS 180-2 specifies the possible
- length of the file up to 2^64 _bits_.
- We compute the number of _bytes_ and convert to bits later. */
- ctx->total64 += len;
-
- /* When we already have some bits in our internal buffer concatenate
- both inputs first. */
- if (in_buf != 0) {
- unsigned add;
-
- add = sizeof(ctx->wbuffer) - in_buf;
- if (add > len)
- add = len;
- memcpy(ctx->wbuffer + in_buf, buffer, add);
- in_buf += add;
-
- /* If we still didn't collect full wbuffer, bail out */
- if (in_buf < sizeof(ctx->wbuffer))
- return;
-
- sha256_process_block64(ctx->wbuffer, 64, ctx);
- 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_block64(memcpy(ctx->wbuffer, buffer, 64), 64, ctx);
- buffer = (const char *)buffer + 64;
- len -= 64;
- }
- } else {
- sha256_process_block64(buffer, len /*& ~63*/, ctx);
- buffer = (const char *)buffer + (len & ~63);
- len &= 63;
- }
- }
-
- /* Move remaining bytes into internal buffer. */
- if (len > 0)
- memcpy(ctx->wbuffer, buffer, len);
-}
-
void FAST_FUNC sha512_hash(const void *buffer, size_t len, sha512_ctx_t *ctx)
{
unsigned in_buf = ctx->total64[0] & 127;
+ unsigned add = 128 - in_buf;
/* First increment the byte count. FIPS 180-2 specifies the possible
length of the file up to 2^128 _bits_.
@@ -471,39 +410,16 @@ void FAST_FUNC sha512_hash(const void *buffer, size_t len, sha512_ctx_t *ctx)
if (ctx->total64[0] < len)
ctx->total64[1]++;
- if (in_buf != 0) {
- unsigned add;
-
- add = sizeof(ctx->wbuffer) - in_buf;
- if (add > len)
- add = len;
+ while (len >= add) { /* transfer whole blocks while possible */
memcpy(ctx->wbuffer + in_buf, buffer, add);
- in_buf += add;
-
- if (in_buf < sizeof(ctx->wbuffer))
- return;
-
- sha512_process_block128(ctx->wbuffer, 128, ctx);
buffer = (const char *)buffer + add;
len -= add;
+ add = 128;
+ in_buf = 0;
+ sha512_process_block128(ctx);
}
- if (len >= 128) {
- if (UNALIGNED_P(buffer, uint64_t)) {
- while (len >= 128) {
- sha512_process_block128(memcpy(ctx->wbuffer, buffer, 128), 128, ctx);
- buffer = (const char *)buffer + 128;
- len -= 128;
- }
- } else {
- sha512_process_block128(buffer, len /*& ~127*/, ctx);
- buffer = (const char *)buffer + (len & ~127);
- len &= 127;
- }
- }
-
- if (len > 0)
- memcpy(ctx->wbuffer, buffer, len);
+ memcpy(ctx->wbuffer + in_buf, buffer, len);
}
@@ -528,48 +444,18 @@ void FAST_FUNC sha1_end(void *resbuf, sha1_ctx_t *ctx)
/* wbuffer is suitably aligned for this */
*(uint64_t *) (&ctx->wbuffer[SHA1_BLOCK_SIZE - 8]) = t;
}
- sha1_process_block64(ctx);
+ ctx->process_block(ctx);
if (pad >= 8)
break;
}
+ in_buf = (ctx->process_block == sha1_process_block64) ? 5 : 8;
/* This way we do not impose alignment constraints on resbuf: */
#if BB_LITTLE_ENDIAN
- for (i = 0; i < ARRAY_SIZE(ctx->hash); ++i)
- ctx->hash[i] = htonl(ctx->hash[i]);
-#endif
- memcpy(resbuf, ctx->hash, sizeof(ctx->hash));
-}
-
-void FAST_FUNC sha256_end(void *resbuf, sha256_ctx_t *ctx)
-{
- unsigned i, pad, in_buf;
-
- in_buf = ctx->total64 & 63;
- /* Pad the buffer to the next 64-byte boundary with 0x80,0,0,0...
- * (FIPS 180-2:5.1.1)
- */
- ctx->wbuffer[in_buf++] = 0x80;
-
- while (1) {
- pad = 64 - in_buf;
- memset(ctx->wbuffer + in_buf, 0, pad);
- in_buf = 0;
- if (pad >= 8) {
- uint64_t t = ctx->total64 << 3;
- t = hton64(t);
- *(uint64_t *) (&ctx->wbuffer[64 - 8]) = t;
- }
- sha256_process_block64(ctx->wbuffer, 64, ctx);
- if (pad >= 8)
- break;
- }
-
-#if BB_LITTLE_ENDIAN
- for (i = 0; i < ARRAY_SIZE(ctx->hash); ++i)
+ for (i = 0; i < in_buf; ++i)
ctx->hash[i] = htonl(ctx->hash[i]);
#endif
- memcpy(resbuf, ctx->hash, sizeof(ctx->hash));
+ memcpy(resbuf, ctx->hash, sizeof(ctx->hash[0]) * in_buf);
}
void FAST_FUNC sha512_end(void *resbuf, sha512_ctx_t *ctx)
@@ -596,7 +482,7 @@ void FAST_FUNC sha512_end(void *resbuf, sha512_ctx_t *ctx)
t = hton64(t);
*(uint64_t *) (&ctx->wbuffer[128 - 16]) = t;
}
- sha512_process_block128(ctx->wbuffer, 128, ctx);
+ sha512_process_block128(ctx);
if (pad >= 16)
break;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 08:11:30 +0000