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Overview
| SHA1 Hash: | 5f2b0de7cdae6cd8e50567b1c8e5d731edb81280 |
|---|---|
| Date: | 2009-11-21 21:37:02 |
| User: | dmitry |
| Comment: | Use sha1.c from git. |
Tags And Properties
- branch=trunk inherited from [a28c83647d]
- sym-trunk inherited from [a28c83647d]
Changes
Changes to src/sha1.c
@@ -2,10 +2,17 @@
** This implementation of SHA1 is adapted from the example implementation
** contained in RFC-3174.
*/
#include <stdint.h>
#include <sys/types.h>
+
+typedef struct {
+ unsigned long long size;
+ unsigned int H[5];
+ unsigned int W[16];
+} SHA1Context;
+
#include "config.h"
#include "sha1.h"
/*
* If you do not have the ISO standard stdint.h header file, then you
@@ -18,100 +25,235 @@
#define SHA1HashSize 20
#define shaSuccess 0
#define shaInputTooLong 1
#define shaStateError 2
-/*
- * This structure will hold context information for the SHA-1
- * hashing operation
+
+
+#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+
+/*
+ * Force usage of rol or ror by selecting the one with the smaller constant.
+ * It _can_ generate slightly smaller code (a constant of 1 is special), but
+ * perhaps more importantly it's possibly faster on any uarch that does a
+ * rotate with a loop.
*/
-typedef struct SHA1Context SHA1Context;
-struct SHA1Context {
- uint32_t Intermediate_Hash[SHA1HashSize/4]; /* Message Digest */
-
- uint32_t Length_Low; /* Message length in bits */
- uint32_t Length_High; /* Message length in bits */
-
- int Message_Block_Index; /* Index into message block array */
- uint8_t Message_Block[64]; /* 512-bit message blocks */
-
- int Computed; /* Is the digest computed? */
- int Corrupted; /* Is the message digest corrupted? */
-};
-
-/*
- * sha1.c
+
+#define SHA_ASM(op, x, n) ({ unsigned int __res; __asm__(op " %1,%0":"=r" (__res):"i" (n), "0" (x)); __res; })
+#define SHA_ROL(x,n) SHA_ASM("rol", x, n)
+#define SHA_ROR(x,n) SHA_ASM("ror", x, n)
+
+#else
+
+#define SHA_ROT(X,l,r) (((X) << (l)) | ((X) >> (r)))
+#define SHA_ROL(X,n) SHA_ROT(X,n,32-(n))
+#define SHA_ROR(X,n) SHA_ROT(X,32-(n),n)
+
+#endif
+
+/*
+ * If you have 32 registers or more, the compiler can (and should)
+ * try to change the array[] accesses into registers. However, on
+ * machines with less than ~25 registers, that won't really work,
+ * and at least gcc will make an unholy mess of it.
+ *
+ * So to avoid that mess which just slows things down, we force
+ * the stores to memory to actually happen (we might be better off
+ * with a 'W(t)=(val);asm("":"+m" (W(t))' there instead, as
+ * suggested by Artur Skawina - that will also make gcc unable to
+ * try to do the silly "optimize away loads" part because it won't
+ * see what the value will be).
*
- * Description:
- * This file implements the Secure Hashing Algorithm 1 as
- * defined in FIPS PUB 180-1 published April 17, 1995.
- *
- * The SHA-1, produces a 160-bit message digest for a given
- * data stream. It should take about 2**n steps to find a
- * message with the same digest as a given message and
- * 2**(n/2) to find any two messages with the same digest,
- * when n is the digest size in bits. Therefore, this
- * algorithm can serve as a means of providing a
- * "fingerprint" for a message.
- *
- * Portability Issues:
- * SHA-1 is defined in terms of 32-bit "words". This code
- * uses <stdint.h> (included via "sha1.h" to define 32 and 8
- * bit unsigned integer types. If your C compiler does not
- * support 32 bit unsigned integers, this code is not
- * appropriate.
+ * Ben Herrenschmidt reports that on PPC, the C version comes close
+ * to the optimized asm with this (ie on PPC you don't want that
+ * 'volatile', since there are lots of registers).
*
- * Caveats:
- * SHA-1 is designed to work with messages less than 2^64 bits
- * long. Although SHA-1 allows a message digest to be generated
- * for messages of any number of bits less than 2^64, this
- * implementation only works with messages with a length that is
- * a multiple of the size of an 8-bit character.
- *
+ * On ARM we get the best code generation by forcing a full memory barrier
+ * between each SHA_ROUND, otherwise gcc happily get wild with spilling and
+ * the stack frame size simply explode and performance goes down the drain.
*/
+
+#if defined(__i386__) || defined(__x86_64__)
+#define setW(x, val) (*(volatile unsigned int *)&W(x) = (val))
+#elif defined(__GNUC__) && defined(__arm__)
+#define setW(x, val) do { W(x) = (val); __asm__("":::"memory"); } while (0)
+#else
+#define setW(x, val) (W(x) = (val))
+#endif
/*
- * Define the SHA1 circular left shift macro
+ * Performance might be improved if the CPU architecture is OK with
+ * unaligned 32-bit loads and a fast ntohl() is available.
+ * Otherwise fall back to byte loads and shifts which is portable,
+ * and is faster on architectures with memory alignment issues.
*/
-#define SHA1CircularShift(bits,word) \
- (((word) << (bits)) | ((word) >> (32-(bits))))
-
-/* Local Function Prototyptes */
-static void SHA1PadMessage(SHA1Context *);
-static void SHA1ProcessMessageBlock(SHA1Context *);
+
+#if defined(__i386__) || defined(__x86_64__) || \
+ defined(__ppc__) || defined(__ppc64__) || \
+ defined(__powerpc__) || defined(__powerpc64__) || \
+ defined(__s390__) || defined(__s390x__)
+
+#define get_be32(p) ntohl(*(unsigned int *)(p))
+#define put_be32(p, v) do { *(unsigned int *)(p) = htonl(v); } while (0)
+
+#else
+
+#define get_be32(p) ( \
+ (*((unsigned char *)(p) + 0) << 24) | \
+ (*((unsigned char *)(p) + 1) << 16) | \
+ (*((unsigned char *)(p) + 2) << 8) | \
+ (*((unsigned char *)(p) + 3) << 0) )
+#define put_be32(p, v) do { \
+ unsigned int __v = (v); \
+ *((unsigned char *)(p) + 0) = __v >> 24; \
+ *((unsigned char *)(p) + 1) = __v >> 16; \
+ *((unsigned char *)(p) + 2) = __v >> 8; \
+ *((unsigned char *)(p) + 3) = __v >> 0; } while (0)
+
+#endif
+
+/* This "rolls" over the 512-bit array */
+#define W(x) (array[(x)&15])
/*
- * SHA1Reset
- *
- * Description:
- * This function will initialize the SHA1Context in preparation
- * for computing a new SHA1 message digest.
- *
- * Parameters:
- * context: [in/out]
- * The context to reset.
- *
- * Returns:
- * sha Error Code.
- *
+ * Where do we get the source from? The first 16 iterations get it from
+ * the input data, the next mix it from the 512-bit array.
*/
-static int SHA1Reset(SHA1Context *context)
+#define SHA_SRC(t) get_be32(data + t)
+#define SHA_MIX(t) SHA_ROL(W(t+13) ^ W(t+8) ^ W(t+2) ^ W(t), 1)
+
+#define SHA_ROUND(t, input, fn, constant, A, B, C, D, E) do { \
+ unsigned int TEMP = input(t); setW(t, TEMP); \
+ E += TEMP + SHA_ROL(A,5) + (fn) + (constant); \
+ B = SHA_ROR(B, 2); } while (0)
+
+#define T_0_15(t, A, B, C, D, E) SHA_ROUND(t, SHA_SRC, (((C^D)&B)^D) , 0x5a827999, A, B, C, D, E )
+#define T_16_19(t, A, B, C, D, E) SHA_ROUND(t, SHA_MIX, (((C^D)&B)^D) , 0x5a827999, A, B, C, D, E )
+#define T_20_39(t, A, B, C, D, E) SHA_ROUND(t, SHA_MIX, (B^C^D) , 0x6ed9eba1, A, B, C, D, E )
+#define T_40_59(t, A, B, C, D, E) SHA_ROUND(t, SHA_MIX, ((B&C)+(D&(B^C))) , 0x8f1bbcdc, A, B, C, D, E )
+#define T_60_79(t, A, B, C, D, E) SHA_ROUND(t, SHA_MIX, (B^C^D) , 0xca62c1d6, A, B, C, D, E )
+
+static void blk_SHA1_Block(SHA1Context *ctx, const unsigned int *data)
+{
+ unsigned int A,B,C,D,E;
+ unsigned int array[16];
+
+ A = ctx->H[0];
+ B = ctx->H[1];
+ C = ctx->H[2];
+ D = ctx->H[3];
+ E = ctx->H[4];
+
+ /* Round 1 - iterations 0-16 take their input from 'data' */
+ T_0_15( 0, A, B, C, D, E);
+ T_0_15( 1, E, A, B, C, D);
+ T_0_15( 2, D, E, A, B, C);
+ T_0_15( 3, C, D, E, A, B);
+ T_0_15( 4, B, C, D, E, A);
+ T_0_15( 5, A, B, C, D, E);
+ T_0_15( 6, E, A, B, C, D);
+ T_0_15( 7, D, E, A, B, C);
+ T_0_15( 8, C, D, E, A, B);
+ T_0_15( 9, B, C, D, E, A);
+ T_0_15(10, A, B, C, D, E);
+ T_0_15(11, E, A, B, C, D);
+ T_0_15(12, D, E, A, B, C);
+ T_0_15(13, C, D, E, A, B);
+ T_0_15(14, B, C, D, E, A);
+ T_0_15(15, A, B, C, D, E);
+
+ /* Round 1 - tail. Input from 512-bit mixing array */
+ T_16_19(16, E, A, B, C, D);
+ T_16_19(17, D, E, A, B, C);
+ T_16_19(18, C, D, E, A, B);
+ T_16_19(19, B, C, D, E, A);
+
+ /* Round 2 */
+ T_20_39(20, A, B, C, D, E);
+ T_20_39(21, E, A, B, C, D);
+ T_20_39(22, D, E, A, B, C);
+ T_20_39(23, C, D, E, A, B);
+ T_20_39(24, B, C, D, E, A);
+ T_20_39(25, A, B, C, D, E);
+ T_20_39(26, E, A, B, C, D);
+ T_20_39(27, D, E, A, B, C);
+ T_20_39(28, C, D, E, A, B);
+ T_20_39(29, B, C, D, E, A);
+ T_20_39(30, A, B, C, D, E);
+ T_20_39(31, E, A, B, C, D);
+ T_20_39(32, D, E, A, B, C);
+ T_20_39(33, C, D, E, A, B);
+ T_20_39(34, B, C, D, E, A);
+ T_20_39(35, A, B, C, D, E);
+ T_20_39(36, E, A, B, C, D);
+ T_20_39(37, D, E, A, B, C);
+ T_20_39(38, C, D, E, A, B);
+ T_20_39(39, B, C, D, E, A);
+
+ /* Round 3 */
+ T_40_59(40, A, B, C, D, E);
+ T_40_59(41, E, A, B, C, D);
+ T_40_59(42, D, E, A, B, C);
+ T_40_59(43, C, D, E, A, B);
+ T_40_59(44, B, C, D, E, A);
+ T_40_59(45, A, B, C, D, E);
+ T_40_59(46, E, A, B, C, D);
+ T_40_59(47, D, E, A, B, C);
+ T_40_59(48, C, D, E, A, B);
+ T_40_59(49, B, C, D, E, A);
+ T_40_59(50, A, B, C, D, E);
+ T_40_59(51, E, A, B, C, D);
+ T_40_59(52, D, E, A, B, C);
+ T_40_59(53, C, D, E, A, B);
+ T_40_59(54, B, C, D, E, A);
+ T_40_59(55, A, B, C, D, E);
+ T_40_59(56, E, A, B, C, D);
+ T_40_59(57, D, E, A, B, C);
+ T_40_59(58, C, D, E, A, B);
+ T_40_59(59, B, C, D, E, A);
+
+ /* Round 4 */
+ T_60_79(60, A, B, C, D, E);
+ T_60_79(61, E, A, B, C, D);
+ T_60_79(62, D, E, A, B, C);
+ T_60_79(63, C, D, E, A, B);
+ T_60_79(64, B, C, D, E, A);
+ T_60_79(65, A, B, C, D, E);
+ T_60_79(66, E, A, B, C, D);
+ T_60_79(67, D, E, A, B, C);
+ T_60_79(68, C, D, E, A, B);
+ T_60_79(69, B, C, D, E, A);
+ T_60_79(70, A, B, C, D, E);
+ T_60_79(71, E, A, B, C, D);
+ T_60_79(72, D, E, A, B, C);
+ T_60_79(73, C, D, E, A, B);
+ T_60_79(74, B, C, D, E, A);
+ T_60_79(75, A, B, C, D, E);
+ T_60_79(76, E, A, B, C, D);
+ T_60_79(77, D, E, A, B, C);
+ T_60_79(78, C, D, E, A, B);
+ T_60_79(79, B, C, D, E, A);
+
+ ctx->H[0] += A;
+ ctx->H[1] += B;
+ ctx->H[2] += C;
+ ctx->H[3] += D;
+ ctx->H[4] += E;
+}
+
+//void SHA1Input(SHA1Context *ctx, const void *data, unsigned long len);
+
+void SHA1Reset(SHA1Context *ctx)
{
- context->Length_Low = 0;
- context->Length_High = 0;
- context->Message_Block_Index = 0;
-
- context->Intermediate_Hash[0] = 0x67452301;
- context->Intermediate_Hash[1] = 0xEFCDAB89;
- context->Intermediate_Hash[2] = 0x98BADCFE;
- context->Intermediate_Hash[3] = 0x10325476;
- context->Intermediate_Hash[4] = 0xC3D2E1F0;
-
- context->Computed = 0;
- context->Corrupted = 0;
-
- return shaSuccess;
+ ctx->size = 0;
+
+ /* Initialize H with the magic constants (see FIPS180 for constants) */
+ ctx->H[0] = 0x67452301;
+ ctx->H[1] = 0xefcdab89;
+ ctx->H[2] = 0x98badcfe;
+ ctx->H[3] = 0x10325476;
+ ctx->H[4] = 0xc3d2e1f0;
}
/*
* SHA1Result
*
@@ -129,289 +271,57 @@
*
* Returns:
* sha Error Code.
*
*/
-static int SHA1Result( SHA1Context *context,
- uint8_t Message_Digest[SHA1HashSize])
+
+void SHA1Result(SHA1Context *ctx, unsigned char hashout[20])
{
- int i;
-
- if (context->Corrupted)
- {
- return context->Corrupted;
- }
-
- if (!context->Computed)
- {
- SHA1PadMessage(context);
- for(i=0; i<64; ++i)
- {
- /* message may be sensitive, clear it out */
- context->Message_Block[i] = 0;
- }
- context->Length_Low = 0; /* and clear length */
- context->Length_High = 0;
- context->Computed = 1;
-
- }
-
- for(i = 0; i < SHA1HashSize; ++i)
- {
- Message_Digest[i] = context->Intermediate_Hash[i>>2]
- >> 8 * ( 3 - ( i & 0x03 ) );
- }
-
- return shaSuccess;
+ static const unsigned char pad[64] = { 0x80 };
+ unsigned int padlen[2];
+ int i;
+
+ /* Pad with a binary 1 (ie 0x80), then zeroes, then length */
+ padlen[0] = htonl(ctx->size >> 29);
+ padlen[1] = htonl(ctx->size << 3);
+
+ i = ctx->size & 63;
+ SHA1Input(ctx, pad, 1+ (63 & (55 - i)));
+ SHA1Input(ctx, padlen, 8);
+
+ /* Output hash */
+ for (i = 0; i < 5; i++)
+ put_be32(hashout + i*4, ctx->H[i]);
}
-/*
- * SHA1Input
- *
- * Description:
- * This function accepts an array of octets as the next portion
- * of the message.
- *
- * Parameters:
- * context: [in/out]
- * The SHA context to update
- * message_array: [in]
- * An array of characters representing the next portion of
- * the message.
- * length: [in]
- * The length of the message in message_array
- *
- * Returns:
- * sha Error Code.
- *
- */
-static
-int SHA1Input( SHA1Context *context,
- const uint8_t *message_array,
- unsigned length)
+void SHA1Input(SHA1Context *ctx, const void *data, unsigned long len)
{
- if (!length)
- {
- return shaSuccess;
- }
-
- if (context->Computed)
- {
- context->Corrupted = shaStateError;
-
- return shaStateError;
- }
-
- if (context->Corrupted)
- {
- return context->Corrupted;
- }
- while(length-- && !context->Corrupted)
- {
- context->Message_Block[context->Message_Block_Index++] =
- (*message_array & 0xFF);
-
- context->Length_Low += 8;
- if (context->Length_Low == 0)
- {
- context->Length_High++;
- if (context->Length_High == 0)
- {
- /* Message is too long */
- context->Corrupted = 1;
- }
- }
-
- if (context->Message_Block_Index == 64)
- {
- SHA1ProcessMessageBlock(context);
- }
-
- message_array++;
- }
-
- return shaSuccess;
-}
-
-/*
- * SHA1ProcessMessageBlock
- *
- * Description:
- * This function will process the next 512 bits of the message
- * stored in the Message_Block array.
- *
- * Parameters:
- * None.
- *
- * Returns:
- * Nothing.
- *
- * Comments:
- * Many of the variable names in this code, especially the
- * single character names, were used because those were the
- * names used in the publication.
- *
- *
- */
-static void SHA1ProcessMessageBlock(SHA1Context *context)
-{
- const uint32_t K[] = { /* Constants defined in SHA-1 */
- 0x5A827999,
- 0x6ED9EBA1,
- 0x8F1BBCDC,
- 0xCA62C1D6
- };
- int t; /* Loop counter */
- uint32_t temp; /* Temporary word value */
- uint32_t W[80]; /* Word sequence */
- uint32_t A, B, C, D, E; /* Word buffers */
-
- /*
- * Initialize the first 16 words in the array W
- */
- for(t = 0; t < 16; t++)
- {
- W[t] = context->Message_Block[t * 4] << 24;
- W[t] |= context->Message_Block[t * 4 + 1] << 16;
- W[t] |= context->Message_Block[t * 4 + 2] << 8;
- W[t] |= context->Message_Block[t * 4 + 3];
- }
-
- for(t = 16; t < 80; t++)
- {
- W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
- }
-
- A = context->Intermediate_Hash[0];
- B = context->Intermediate_Hash[1];
- C = context->Intermediate_Hash[2];
- D = context->Intermediate_Hash[3];
- E = context->Intermediate_Hash[4];
-
- for(t = 0; t < 20; t++)
- {
- temp = SHA1CircularShift(5,A) +
- ((B & C) | ((~B) & D)) + E + W[t] + K[0];
- E = D;
- D = C;
- C = SHA1CircularShift(30,B);
-
- B = A;
- A = temp;
- }
-
- for(t = 20; t < 40; t++)
- {
- temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1];
- E = D;
- D = C;
- C = SHA1CircularShift(30,B);
- B = A;
- A = temp;
- }
-
- for(t = 40; t < 60; t++)
- {
- temp = SHA1CircularShift(5,A) +
- ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];
- E = D;
- D = C;
- C = SHA1CircularShift(30,B);
- B = A;
- A = temp;
- }
-
- for(t = 60; t < 80; t++)
- {
- temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3];
- E = D;
- D = C;
- C = SHA1CircularShift(30,B);
- B = A;
- A = temp;
- }
-
- context->Intermediate_Hash[0] += A;
- context->Intermediate_Hash[1] += B;
- context->Intermediate_Hash[2] += C;
- context->Intermediate_Hash[3] += D;
- context->Intermediate_Hash[4] += E;
-
- context->Message_Block_Index = 0;
-}
-
-/*
- * SHA1PadMessage
- *
-
- * Description:
- * According to the standard, the message must be padded to an even
- * 512 bits. The first padding bit must be a '1'. The last 64
- * bits represent the length of the original message. All bits in
- * between should be 0. This function will pad the message
- * according to those rules by filling the Message_Block array
- * accordingly. It will also call the ProcessMessageBlock function
- * provided appropriately. When it returns, it can be assumed that
- * the message digest has been computed.
- *
- * Parameters:
- * context: [in/out]
- * The context to pad
- * ProcessMessageBlock: [in]
- * The appropriate SHA*ProcessMessageBlock function
- * Returns:
- * Nothing.
- *
- */
-static void SHA1PadMessage(SHA1Context *context)
-{
- /*
- * Check to see if the current message block is too small to hold
- * the initial padding bits and length. If so, we will pad the
- * block, process it, and then continue padding into a second
- * block.
- */
- if (context->Message_Block_Index > 55)
- {
- context->Message_Block[context->Message_Block_Index++] = 0x80;
- while(context->Message_Block_Index < 64)
- {
- context->Message_Block[context->Message_Block_Index++] = 0;
- }
-
- SHA1ProcessMessageBlock(context);
-
- while(context->Message_Block_Index < 56)
- {
- context->Message_Block[context->Message_Block_Index++] = 0;
- }
- }
- else
- {
- context->Message_Block[context->Message_Block_Index++] = 0x80;
- while(context->Message_Block_Index < 56)
- {
-
- context->Message_Block[context->Message_Block_Index++] = 0;
- }
- }
-
- /*
- * Store the message length as the last 8 octets
- */
- context->Message_Block[56] = context->Length_High >> 24;
- context->Message_Block[57] = context->Length_High >> 16;
- context->Message_Block[58] = context->Length_High >> 8;
- context->Message_Block[59] = context->Length_High;
- context->Message_Block[60] = context->Length_Low >> 24;
- context->Message_Block[61] = context->Length_Low >> 16;
- context->Message_Block[62] = context->Length_Low >> 8;
- context->Message_Block[63] = context->Length_Low;
-
- SHA1ProcessMessageBlock(context);
-}
-
+ int lenW = ctx->size & 63;
+
+ ctx->size += len;
+
+ /* Read the data into W and process blocks as they get full */
+ if (lenW) {
+ int left = 64 - lenW;
+ if (len < left)
+ left = len;
+ memcpy(lenW + (char *)ctx->W, data, left);
+ lenW = (lenW + left) & 63;
+ len -= left;
+ data = ((const char *)data + left);
+ if (lenW)
+ return;
+ blk_SHA1_Block(ctx, ctx->W);
+ }
+ while (len >= 64) {
+ blk_SHA1_Block(ctx, data);
+ data = ((const char *)data + 64);
+ len -= 64;
+ }
+ if (len)
+ memcpy(ctx->W, data, len);
+}
/*
** Convert a digest into base-16. digest should be declared as
** "unsigned char digest[20]" in the calling function. The SHA1
** digest is stored in the first 20 bytes. zBuf should