Merge trunk.

1 files changed, 375 insertions, 0 deletions

diff --git a/lib/sha1.c b/lib/sha1.c
new file mode 100644
index 00000000..ee4fcc19
--- /dev/null
+++ b/lib/sha1.c
@@ -0,0 +1,375 @@
+/*
+ * SHA1 hashing code copied from Lepton's crack <http://usuarios.lycos.es/reinob/>
+ *
+ * Adapted to be API-compatible with the previous (GPL-incompatible) code.
+ */
+
+/*
+ *  sha1.c
+ *
+ *  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.
+ *
+ *  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.
+ *
+ */
+
+#include "sha1.h"
+
+/*
+ *  Define the SHA1 circular left shift macro
+ */
+#define SHA1CircularShift(bits,word) \
+       (((word) << (bits)) | ((word) >> (32-(bits))))
+
+/* Local Function Prototyptes */
+static void sha1_pad(sha1_state_t *);
+static void sha1_process_block(sha1_state_t *);
+
+/*
+ *  sha1_init
+ *
+ *  Description:
+ *      This function will initialize the sha1_state_t in preparation
+ *      for computing a new SHA1 message digest.
+ *
+ *  Parameters:
+ *      context: [in/out]
+ *          The context to reset.
+ *
+ *  Returns:
+ *      sha Error Code.
+ *
+ */
+int sha1_init(sha1_state_t * context)
+{
+	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;
+}
+
+/*
+ *  sha1_finish
+ *
+ *  Description:
+ *      This function will return the 160-bit message digest into the
+ *      Message_Digest array  provided by the caller.
+ *      NOTE: The first octet of hash is stored in the 0th element,
+ *            the last octet of hash in the 19th element.
+ *
+ *  Parameters:
+ *      context: [in/out]
+ *          The context to use to calculate the SHA-1 hash.
+ *      Message_Digest: [out]
+ *          Where the digest is returned.
+ *
+ *  Returns:
+ *      sha Error Code.
+ *
+ */
+int sha1_finish(sha1_state_t * context, uint8_t Message_Digest[sha1_hash_size])
+{
+	int i;
+
+	if (!context || !Message_Digest) {
+		return shaNull;
+	}
+
+	if (context->Corrupted) {
+		return context->Corrupted;
+	}
+
+	if (!context->Computed) {
+		sha1_pad(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 < sha1_hash_size; ++i) {
+		Message_Digest[i] = context->Intermediate_Hash[i >> 2]
+		    >> 8 * (3 - (i & 0x03));
+	}
+
+	return shaSuccess;
+}
+
+/*
+ *  sha1_append
+ *
+ *  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.
+ *
+ */
+int
+sha1_append(sha1_state_t * context,
+	  const uint8_t * message_array, unsigned length)
+{
+	if (!length) {
+		return shaSuccess;
+	}
+
+	if (!context || !message_array) {
+		return shaNull;
+	}
+
+	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) {
+			sha1_process_block(context);
+		}
+
+		message_array++;
+	}
+
+	return shaSuccess;
+}
+
+/*
+ *  sha1_process_block
+ *
+ *  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 sha1_process_block(sha1_state_t * 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;
+}
+
+/*
+ *  sha1_pad
+ *
+ *  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 sha1_pad(sha1_state_t * 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;
+		}
+
+		sha1_process_block(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;
+
+	sha1_process_block(context);
+}