Merge fdk-aac 'v2.0.3' into dabplus2dabplus2

1 files changed, 399 insertions, 0 deletions

diff --git a/sha1.c b/sha1.c
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+++ b/sha1.c
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+/*!
+ * \copy
+ *     Copyright (c)  1998, 2009 Paul E. Jones <paulej@packetizer.com>
+ *     All rights reserved.
+ *
+ *     Redistribution and use in source and binary forms, with or without
+ *     modification, are permitted provided that the following conditions
+ *     are met:
+ *
+ *        * Redistributions of source code must retain the above copyright
+ *          notice, this list of conditions and the following disclaimer.
+ *
+ *        * Redistributions in binary form must reproduce the above copyright
+ *          notice, this list of conditions and the following disclaimer in
+ *          the documentation and/or other materials provided with the
+ *          distribution.
+ *
+ *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *     "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ *     FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ *     COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *     BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ *     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ *     ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *     POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*
+ *  Description:
+ *      This file implements the Secure Hashing Standard as defined
+ *      in FIPS PUB 180-1 published April 17, 1995.
+ *
+ *      The Secure Hashing Standard, which uses the Secure Hashing
+ *      Algorithm (SHA), produces a 160-bit message digest for a
+ *      given data stream.  In theory, it is highly improbable that
+ *      two messages will produce the same message digest.  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 was
+ *      written with the expectation that the processor has at least
+ *      a 32-bit machine word size.  If the machine word size is larger,
+ *      the code should still function properly.  One caveat to that
+ *      is that the input functions taking characters and character
+ *      arrays assume that only 8 bits of information are stored in each
+ *      character.
+ *
+ *  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 circular shift macro
+ */
+#define SHA1CircularShift(bits,word) \
+                ((((word) << (bits)) & 0xFFFFFFFF) | \
+                ((word) >> (32-(bits))))
+
+/* Function prototypes */
+void SHA1ProcessMessageBlock(SHA1Context *);
+void SHA1PadMessage(SHA1Context *);
+
+/*
+ *  SHA1Reset
+ *
+ *  Description:
+ *      This function will initialize the SHA1Context in preparation
+ *      for computing a new message digest.
+ *
+ *  Parameters:
+ *      context: [in/out]
+ *          The context to reset.
+ *
+ *  Returns:
+ *      Nothing.
+ *
+ *  Comments:
+ *
+ */
+void SHA1Reset(SHA1Context *context)
+{
+    context->Length_Low             = 0;
+    context->Length_High            = 0;
+    context->Message_Block_Index    = 0;
+
+    context->Message_Digest[0]      = 0x67452301;
+    context->Message_Digest[1]      = 0xEFCDAB89;
+    context->Message_Digest[2]      = 0x98BADCFE;
+    context->Message_Digest[3]      = 0x10325476;
+    context->Message_Digest[4]      = 0xC3D2E1F0;
+
+    context->Computed   = 0;
+    context->Corrupted  = 0;
+}
+
+/*
+ *  SHA1Result
+ *
+ *  Description:
+ *      This function will return the 160-bit message digest into the
+ *      digest array provided as a parameter.
+ *
+ *  Parameters:
+ *      context: [in/out]
+ *          The context to use to calculate the SHA-1 hash.
+ *      digest: [out]
+ *          An array of characters where the digest is written.
+ *
+ *  Returns:
+ *      1 if successful, 0 if it failed.
+ *
+ *  Comments:
+ *
+ */
+int SHA1Result(SHA1Context *context, unsigned char *digest)
+{
+    int i;
+
+    if (context->Corrupted)
+    {
+        return 0;
+    }
+
+    if (!context->Computed)
+    {
+        SHA1PadMessage(context);
+        context->Computed = 1;
+    }
+
+    for (i = 0; i < SHA_DIGEST_LENGTH; i++)
+        digest[i] = context->Message_Digest[i / 4] >> (8 * (3 - (i % 4)));
+
+    return 1;
+}
+
+/*
+ *  SHA1Input
+ *
+ *  Description:
+ *      This function accepts an array of octets as the next portion of
+ *      the message.
+ *
+ *  Parameters:
+ *      context: [in/out]
+ *          The SHA-1 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:
+ *      Nothing.
+ *
+ *  Comments:
+ *
+ */
+void SHA1Input(     SHA1Context         *context,
+                    const unsigned char *message_array,
+                    unsigned            length)
+{
+    if (!length)
+    {
+        return;
+    }
+
+    if (context->Computed || context->Corrupted)
+    {
+        context->Corrupted = 1;
+        return;
+    }
+
+    while(length-- && !context->Corrupted)
+    {
+        context->Message_Block[context->Message_Block_Index++] =
+                                                (*message_array & 0xFF);
+
+        context->Length_Low += 8;
+        /* Force it to 32 bits */
+        context->Length_Low &= 0xFFFFFFFF;
+        if (context->Length_Low == 0)
+        {
+            context->Length_High++;
+            /* Force it to 32 bits */
+            context->Length_High &= 0xFFFFFFFF;
+            if (context->Length_High == 0)
+            {
+                /* Message is too long */
+                context->Corrupted = 1;
+            }
+        }
+
+        if (context->Message_Block_Index == 64)
+        {
+            SHA1ProcessMessageBlock(context);
+        }
+
+        message_array++;
+    }
+}
+
+/*
+ *  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 the SHAContext, especially the
+ *      single character names, were used because those were the names
+ *      used in the publication.
+ *
+ *
+ */
+void SHA1ProcessMessageBlock(SHA1Context *context)
+{
+    const unsigned K[] =            /* Constants defined in SHA-1   */
+    {
+        0x5A827999,
+        0x6ED9EBA1,
+        0x8F1BBCDC,
+        0xCA62C1D6
+    };
+    int         t;                  /* Loop counter                 */
+    unsigned    temp;               /* Temporary word value         */
+    unsigned    W[80];              /* Word sequence                */
+    unsigned    A, B, C, D, E;      /* Word buffers                 */
+
+    /*
+     *  Initialize the first 16 words in the array W
+     */
+    for(t = 0; t < 16; t++)
+    {
+        W[t] = ((unsigned) context->Message_Block[t * 4]) << 24;
+        W[t] |= ((unsigned) context->Message_Block[t * 4 + 1]) << 16;
+        W[t] |= ((unsigned) context->Message_Block[t * 4 + 2]) << 8;
+        W[t] |= ((unsigned) 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->Message_Digest[0];
+    B = context->Message_Digest[1];
+    C = context->Message_Digest[2];
+    D = context->Message_Digest[3];
+    E = context->Message_Digest[4];
+
+    for(t = 0; t < 20; t++)
+    {
+        temp =  SHA1CircularShift(5,A) +
+                ((B & C) | ((~B) & D)) + E + W[t] + K[0];
+        temp &= 0xFFFFFFFF;
+        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];
+        temp &= 0xFFFFFFFF;
+        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];
+        temp &= 0xFFFFFFFF;
+        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];
+        temp &= 0xFFFFFFFF;
+        E = D;
+        D = C;
+        C = SHA1CircularShift(30,B);
+        B = A;
+        A = temp;
+    }
+
+    context->Message_Digest[0] =
+                        (context->Message_Digest[0] + A) & 0xFFFFFFFF;
+    context->Message_Digest[1] =
+                        (context->Message_Digest[1] + B) & 0xFFFFFFFF;
+    context->Message_Digest[2] =
+                        (context->Message_Digest[2] + C) & 0xFFFFFFFF;
+    context->Message_Digest[3] =
+                        (context->Message_Digest[3] + D) & 0xFFFFFFFF;
+    context->Message_Digest[4] =
+                        (context->Message_Digest[4] + E) & 0xFFFFFFFF;
+
+    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 SHA1ProcessMessageBlock()
+ *      appropriately.  When it returns, it can be assumed that the
+ *      message digest has been computed.
+ *
+ *  Parameters:
+ *      context: [in/out]
+ *          The context to pad
+ *
+ *  Returns:
+ *      Nothing.
+ *
+ *  Comments:
+ *
+ */
+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) & 0xFF;
+    context->Message_Block[57] = (context->Length_High >> 16) & 0xFF;
+    context->Message_Block[58] = (context->Length_High >> 8) & 0xFF;
+    context->Message_Block[59] = (context->Length_High) & 0xFF;
+    context->Message_Block[60] = (context->Length_Low >> 24) & 0xFF;
+    context->Message_Block[61] = (context->Length_Low >> 16) & 0xFF;
+    context->Message_Block[62] = (context->Length_Low >> 8) & 0xFF;
+    context->Message_Block[63] = (context->Length_Low) & 0xFF;
+
+    SHA1ProcessMessageBlock(context);
+}