summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--include/libbb.h6
-rw-r--r--libbb/md5.c19
-rw-r--r--libbb/sha1.c224
3 files changed, 113 insertions, 136 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 4c99010..3f566f8 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1329,18 +1329,16 @@ void sha1_begin(sha1_ctx_t *ctx) FAST_FUNC;
void sha1_hash(const void *data, size_t length, sha1_ctx_t *ctx) FAST_FUNC;
void sha1_end(void *resbuf, sha1_ctx_t *ctx) FAST_FUNC;
typedef struct sha256_ctx_t {
- unsigned wbuflen;
- uint32_t H[8];
uint64_t total64;
+ uint32_t hash[8];
char wbuffer[64*2]; /* NB: always correctly aligned for uint64_t */
} sha256_ctx_t;
void sha256_begin(sha256_ctx_t *ctx) FAST_FUNC;
void sha256_hash(const void *buffer, size_t len, sha256_ctx_t *ctx) FAST_FUNC;
void sha256_end(void *resbuf, sha256_ctx_t *ctx) FAST_FUNC;
typedef struct sha512_ctx_t {
- unsigned wbuflen;
- uint64_t H[8];
uint64_t total64[2];
+ uint64_t hash[8];
char wbuffer[128*2]; /* NB: always correctly aligned for uint64_t */
} sha512_ctx_t;
void sha512_begin(sha512_ctx_t *ctx) FAST_FUNC;
diff --git a/libbb/md5.c b/libbb/md5.c
index eb15d75..768dfbc 100644
--- a/libbb/md5.c
+++ b/libbb/md5.c
@@ -416,15 +416,14 @@ void FAST_FUNC md5_end(void *resbuf, md5_ctx_t *ctx)
md5_hash_block(ctx->buffer, ctx);
md5_hash_block(buf, ctx);
- /* Put result from CTX in first 16 bytes following RESBUF. The result is
- * always in little endian byte order, so that a byte-wise output yields
- * to the wanted ASCII representation of the message digest.
- *
- * IMPORTANT: On some systems it is required that RESBUF is correctly
- * aligned for a 32 bits value.
+ /* The MD5 result is in little endian byte order.
+ * We (ab)use the fact that A-D are consecutive in memory.
*/
- ((uint32_t *) resbuf)[0] = SWAP_LE32(ctx->A);
- ((uint32_t *) resbuf)[1] = SWAP_LE32(ctx->B);
- ((uint32_t *) resbuf)[2] = SWAP_LE32(ctx->C);
- ((uint32_t *) resbuf)[3] = SWAP_LE32(ctx->D);
+#if BB_BIG_ENDIAN
+ ctx->A = SWAP_LE32(ctx->A);
+ ctx->B = SWAP_LE32(ctx->B);
+ ctx->C = SWAP_LE32(ctx->C);
+ ctx->D = SWAP_LE32(ctx->D);
+#endif
+ memcpy(resbuf, &ctx->A, sizeof(ctx->A) * 4);
}
diff --git a/libbb/sha1.c b/libbb/sha1.c
index 38be575..1584e98 100644
--- a/libbb/sha1.c
+++ b/libbb/sha1.c
@@ -200,20 +200,14 @@ static const uint32_t K512_lo[80] = {
static void sha256_process_block64(const void *buffer, size_t len, sha256_ctx_t *ctx)
{
const uint32_t *words = buffer;
- 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_.
- We compute the number of _bytes_ and convert to bits later. */
- len &= ~(size_t)(sizeof(uint32_t) * 16 - 1);
- ctx->total64 += len;
+ uint32_t a = ctx->hash[0];
+ uint32_t b = ctx->hash[1];
+ uint32_t c = ctx->hash[2];
+ uint32_t d = ctx->hash[3];
+ uint32_t e = ctx->hash[4];
+ uint32_t f = ctx->hash[5];
+ uint32_t g = ctx->hash[6];
+ uint32_t h = ctx->hash[7];
/* Process all bytes in the buffer with 64 bytes in each round of
the loop. */
@@ -260,14 +254,14 @@ static void sha256_process_block64(const void *buffer, size_t len, sha256_ctx_t
#undef R1
/* Add the starting values of the context according to FIPS 180-2:6.2.2
step 4. */
- ctx->H[0] = a += ctx->H[0];
- ctx->H[1] = b += ctx->H[1];
- ctx->H[2] = c += ctx->H[2];
- ctx->H[3] = d += ctx->H[3];
- ctx->H[4] = e += ctx->H[4];
- ctx->H[5] = f += ctx->H[5];
- ctx->H[6] = g += ctx->H[6];
- ctx->H[7] = h += ctx->H[7];
+ 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--;
@@ -278,22 +272,14 @@ static void sha256_process_block64(const void *buffer, size_t len, sha256_ctx_t
static void sha512_process_block128(const void *buffer, size_t len, sha512_ctx_t *ctx)
{
const uint64_t *words = buffer;
- 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_.
- We compute the number of _bytes_ and convert to bits later. */
- len &= ~(size_t)(sizeof(uint64_t) * 16 - 1);
- ctx->total64[0] += len;
- if (ctx->total64[0] < len)
- ctx->total64[1]++;
+ uint64_t a = ctx->hash[0];
+ uint64_t b = ctx->hash[1];
+ uint64_t c = ctx->hash[2];
+ uint64_t d = ctx->hash[3];
+ uint64_t e = ctx->hash[4];
+ uint64_t f = ctx->hash[5];
+ uint64_t g = ctx->hash[6];
+ uint64_t h = ctx->hash[7];
len /= (sizeof(uint64_t) * 16);
while (len) {
@@ -338,14 +324,14 @@ static void sha512_process_block128(const void *buffer, size_t len, sha512_ctx_t
#undef R1
/* Add the starting values of the context according to FIPS 180-2:6.3.2
step 4. */
- ctx->H[0] = a += ctx->H[0];
- ctx->H[1] = b += ctx->H[1];
- ctx->H[2] = c += ctx->H[2];
- ctx->H[3] = d += ctx->H[3];
- ctx->H[4] = e += ctx->H[4];
- ctx->H[5] = f += ctx->H[5];
- ctx->H[6] = g += ctx->H[6];
- ctx->H[7] = h += ctx->H[7];
+ 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--;
}
@@ -386,9 +372,8 @@ static const uint32_t init512_lo[] = {
(FIPS 180-2:5.3.2) */
void FAST_FUNC sha256_begin(sha256_ctx_t *ctx)
{
- memcpy(ctx->H, init256, sizeof(init256));
+ memcpy(ctx->hash, init256, sizeof(init256));
ctx->total64 = 0;
- ctx->wbuflen = 0;
}
/* Initialize structure containing state of computation.
(FIPS 180-2:5.3.3) */
@@ -396,9 +381,8 @@ void FAST_FUNC sha512_begin(sha512_ctx_t *ctx)
{
int i;
for (i = 0; i < 8; i++)
- ctx->H[i] = ((uint64_t)(init256[i]) << 32) + init512_lo[i];
+ ctx->hash[i] = ((uint64_t)(init256[i]) << 32) + init512_lo[i];
ctx->total64[0] = ctx->total64[1] = 0;
- ctx->wbuflen = 0;
}
@@ -406,28 +390,35 @@ void FAST_FUNC sha512_begin(sha512_ctx_t *ctx)
/* hash_compile function as required. */
void FAST_FUNC sha1_hash(const void *buffer, size_t len, sha1_ctx_t *ctx)
{
- unsigned wbuflen = ctx->total64 & SHA1_MASK;
- unsigned add = SHA1_BLOCK_SIZE - wbuflen;
+ unsigned in_buf = ctx->total64 & SHA1_MASK;
+ unsigned add = SHA1_BLOCK_SIZE - in_buf;
ctx->total64 += len;
while (len >= add) { /* transfer whole blocks while possible */
- memcpy(((unsigned char *) ctx->wbuffer) + wbuflen, buffer, add);
+ memcpy(((unsigned char *) ctx->wbuffer) + in_buf, buffer, add);
buffer = (const char *)buffer + add;
len -= add;
add = SHA1_BLOCK_SIZE;
- wbuflen = 0;
+ in_buf = 0;
sha1_process_block64(ctx);
}
- memcpy(((unsigned char *) ctx->wbuffer) + wbuflen, buffer, len);
+ memcpy(((unsigned char *) 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 (ctx->wbuflen != 0) {
+ if (in_buf != 0) {
unsigned add;
/* NB: 1/2 of wbuffer is used only in sha256_end
@@ -435,18 +426,17 @@ void FAST_FUNC sha256_hash(const void *buffer, size_t len, sha256_ctx_t *ctx)
* With buffer twice as small, it may happen that
* we have it almost full and can't add length field. */
- add = sizeof(ctx->wbuffer)/2 - ctx->wbuflen;
+ add = sizeof(ctx->wbuffer)/2 - in_buf;
if (add > len)
add = len;
- memcpy(&ctx->wbuffer[ctx->wbuflen], buffer, add);
- ctx->wbuflen += add;
+ memcpy(&ctx->wbuffer[in_buf], buffer, add);
+ in_buf += add;
/* If we still didn't collect full wbuffer, bail out */
- if (ctx->wbuflen < sizeof(ctx->wbuffer)/2)
+ if (in_buf < sizeof(ctx->wbuffer)/2)
return;
sha256_process_block64(ctx->wbuffer, 64, ctx);
- ctx->wbuflen = 0;
buffer = (const char *)buffer + add;
len -= add;
}
@@ -454,7 +444,7 @@ void FAST_FUNC sha256_hash(const void *buffer, size_t len, sha256_ctx_t *ctx)
/* Process available complete blocks. */
if (len >= 64) {
if (UNALIGNED_P(buffer, uint32_t)) {
- while (len > 64) {
+ while (len >= 64) {
sha256_process_block64(memcpy(ctx->wbuffer, buffer, 64), 64, ctx);
buffer = (const char *)buffer + 64;
len -= 64;
@@ -469,33 +459,40 @@ void FAST_FUNC sha256_hash(const void *buffer, size_t len, sha256_ctx_t *ctx)
/* Move remaining bytes into internal buffer. */
if (len > 0) {
memcpy(ctx->wbuffer, buffer, len);
- ctx->wbuflen = len;
}
}
void FAST_FUNC sha512_hash(const void *buffer, size_t len, sha512_ctx_t *ctx)
{
- if (ctx->wbuflen != 0) {
+ unsigned in_buf = ctx->total64[0] & 127;
+
+ /* First increment the byte count. FIPS 180-2 specifies the possible
+ length of the file up to 2^128 _bits_.
+ We compute the number of _bytes_ and convert to bits later. */
+ ctx->total64[0] += len;
+ if (ctx->total64[0] < len)
+ ctx->total64[1]++;
+
+ if (in_buf != 0) {
unsigned add;
- add = sizeof(ctx->wbuffer)/2 - ctx->wbuflen;
+ add = sizeof(ctx->wbuffer)/2 - in_buf;
if (add > len)
add = len;
- memcpy(&ctx->wbuffer[ctx->wbuflen], buffer, add);
- ctx->wbuflen += add;
+ memcpy(&ctx->wbuffer[in_buf], buffer, add);
+ in_buf += add;
- if (ctx->wbuflen < sizeof(ctx->wbuffer)/2)
+ if (in_buf < sizeof(ctx->wbuffer)/2)
return;
sha512_process_block128(ctx->wbuffer, 128, ctx);
- ctx->wbuflen = 0;
buffer = (const char *)buffer + add;
len -= add;
}
if (len >= 128) {
if (UNALIGNED_P(buffer, uint64_t)) {
- while (len > 128) {
+ while (len >= 128) {
sha512_process_block128(memcpy(ctx->wbuffer, buffer, 128), 128, ctx);
buffer = (const char *)buffer + 128;
len -= 128;
@@ -509,20 +506,19 @@ void FAST_FUNC sha512_hash(const void *buffer, size_t len, sha512_ctx_t *ctx)
if (len > 0) {
memcpy(ctx->wbuffer, buffer, len);
- ctx->wbuflen = len;
}
}
void FAST_FUNC sha1_end(void *resbuf, sha1_ctx_t *ctx)
{
- unsigned i, wbuflen, pad;
+ unsigned i, pad, in_buf;
/* Pad the buffer to the next 64-byte boundary with 0x80,0,0,0... */
- wbuflen = ctx->total64 & SHA1_MASK;
- ((uint8_t *)ctx->wbuffer)[wbuflen++] = 0x80;
- pad = SHA1_BLOCK_SIZE - wbuflen;
- memset(((uint8_t *)ctx->wbuffer) + wbuflen, 0, pad);
+ in_buf = ctx->total64 & SHA1_MASK;
+ ((uint8_t *)ctx->wbuffer)[in_buf++] = 0x80;
+ pad = SHA1_BLOCK_SIZE - in_buf;
+ memset(((uint8_t *)ctx->wbuffer) + in_buf, 0, pad);
/* We need 1+8 or more empty positions, one for the padding byte
* (above) and eight for the length count.
@@ -543,77 +539,61 @@ void FAST_FUNC sha1_end(void *resbuf, sha1_ctx_t *ctx)
sha1_process_block64(ctx);
- /* Extract the hash value as bytes in case resbuf is
- * misaligned for 32-bit words */
- for (i = 0; i < ARRAY_SIZE(ctx->hash); ++i) {
- uint32_t t = ctx->hash[i];
- t = ntohl(t); /* paranoia. this can be a macro */
- move_to_unaligned32(resbuf, t); /* ditto */
- resbuf = (char*)resbuf + 4;
- }
+#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));
}
-
-/* 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. */
- unsigned bytes = ctx->wbuflen;
- unsigned pad;
-
- /* Now count remaining bytes. */
- ctx->total64 += bytes;
+ unsigned i, pad, in_buf;
/* 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->wbuffer[bytes], 0, pad);
- ctx->wbuffer[bytes] = 0x80;
+ in_buf = ctx->total64 & 63;
+ pad = (in_buf >= 56 ? 64 + 56 - in_buf : 56 - in_buf);
+ memset(&ctx->wbuffer[in_buf], 0, pad);
+ ctx->wbuffer[in_buf] = 0x80;
/* Put the 64-bit file length in *bits* at the end of the buffer. */
{
uint64_t t = ctx->total64 << 3;
t = hton64(t);
/* wbuffer is suitably aligned for this */
- *(uint64_t *) &ctx->wbuffer[bytes + pad] = t;
+ *(uint64_t *) &ctx->wbuffer[in_buf + pad] = t;
}
/* Process last bytes. */
- sha256_process_block64(ctx->wbuffer, bytes + pad + 8, ctx);
+ sha256_process_block64(ctx->wbuffer, in_buf + pad + 8, ctx);
- for (unsigned i = 0; i < 8; ++i)
- ((uint32_t *) resbuf)[i] = ntohl(ctx->H[i]);
+#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));
}
-/* 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)
{
- unsigned bytes = ctx->wbuflen;
- unsigned pad;
-
- ctx->total64[0] += bytes;
- if (ctx->total64[0] < bytes)
- ctx->total64[1]++;
+ unsigned i, pad, in_buf;
/* 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->wbuffer[bytes], 0, pad);
- ctx->wbuffer[bytes] = 0x80;
+ in_buf = ctx->total64[0] & 127;
+ pad = in_buf >= 112 ? 128 + 112 - in_buf : 112 - in_buf;
+ memset(&ctx->wbuffer[in_buf], 0, pad);
+ ctx->wbuffer[in_buf] = 0x80;
- *(uint64_t *) &ctx->wbuffer[bytes + pad + 8] = hton64(ctx->total64[0] << 3);
- *(uint64_t *) &ctx->wbuffer[bytes + pad] = hton64((ctx->total64[1] << 3) | (ctx->total64[0] >> 61));
+ *(uint64_t *) &ctx->wbuffer[in_buf + pad + 8] = hton64(ctx->total64[0] << 3);
+ *(uint64_t *) &ctx->wbuffer[in_buf + pad] = hton64((ctx->total64[1] << 3) | (ctx->total64[0] >> 61));
- sha512_process_block128(ctx->wbuffer, bytes + pad + 16, ctx);
+ sha512_process_block128(ctx->wbuffer, in_buf + pad + 16, ctx);
- for (unsigned i = 0; i < 8; ++i)
- ((uint64_t *) resbuf)[i] = hton64(ctx->H[i]);
+#if BB_LITTLE_ENDIAN
+ for (i = 0; i < ARRAY_SIZE(ctx->hash); ++i)
+ ctx->hash[i] = hton64(ctx->hash[i]);
+#endif
+ memcpy(resbuf, ctx->hash, sizeof(ctx->hash));
}
generated by cgit v1.1 at 2024-12-26 08:26:16 +0000