/*
 *  sha1.c
 *
/**************************** sha1.c ***************************/
/***************** See RFC 6234 for details. *******************/
/* Copyright (c) 2011 IETF Trust and the persons identified as */
/* authors of the code.  All rights reserved.                  */
/* See sha.h for terms of use and redistribution.              */

/*
 *  Description:
 *      This file implements the Secure Hashing Algorithm 1 as
 *      defined in FIPS PUB 180-1 published April 17, 1995.
 *      This file implements the Secure Hash Algorithm SHA-1
 *      as defined in the U.S. National Institute of Standards
 *      and Technology Federal Information Processing Standards
 *      Publication (FIPS PUB) 180-3 published in October 2008
 *      and formerly defined in its predecessors, FIPS PUB 180-1
 *      and FIP PUB 180-2.
 *
 *      A combined document showing all algorithms is available at
 *              http://csrc.nist.gov/publications/fips/
 *                     fips180-3/fips180-3_final.pdf
 *
 *      The SHA-1, produces a 160-bit message digest for a given
 *      The SHA-1 algorithm produces a 160-bit message digest for a
 *      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
 *      given data stream that 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
 *      uses <stdint.h> (included via "sha.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
 *      long.  This implementation uses SHA1Input() to hash the bits
 *      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.
 *
 *      that are a multiple of the size of an 8-bit octet, and then
 *      optionally uses SHA1FinalBits() to hash the final few bits of
 *      the input.
 */

#include "sha.h"
#include "sha1.h"
#include "sha-private.h"

/*
 *  Define the SHA1 circular left shift macro
 */
#define SHA1CircularShift(bits,word) \
#define SHA1_ROTL(bits,word) \
                (((word) << (bits)) | ((word) >> (32-(bits))))

/*
 * Add "length" to the length.
 * Set Corrupted when overflow has occurred.
 */
static uint32_t addTemp;
#define SHA1AddLength(context, length)                     \
    (addTemp = (context)->Length_Low,                      \
     (context)->Corrupted =                                \
        (((context)->Length_Low += (length)) < addTemp) && \
        (++(context)->Length_High == 0) ? shaInputTooLong  \
                                        : (context)->Corrupted )

/* Local Function Prototyptes */
/* Local Function Prototypes */
static void SHA1PadMessage(SHA1Context *);
static void SHA1ProcessMessageBlock(SHA1Context *);
static void SHA1ProcessMessageBlock(SHA1Context *context);
static void SHA1Finalize(SHA1Context *context, uint8_t Pad_Byte);
static void SHA1PadMessage(SHA1Context *context, uint8_t Pad_Byte);

/*
 *  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.
 *
 */
static int SHA1Reset(SHA1Context *context)
int SHA1Reset(SHA1Context *context)
{
    if (!context)
    {
  if (!context) return shaNull;

        return shaNull;
    }

    context->Length_Low             = 0;
    context->Length_High            = 0;
    context->Message_Block_Index    = 0;
  context->Length_High = context->Length_Low = 0;
  context->Message_Block_Index = 0;

  /* Initial Hash Values: FIPS 180-3 section 5.3.1 */
    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->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;
  context->Computed   = 0;
  context->Corrupted  = shaSuccess;

    return shaSuccess;
  return shaSuccess;
}

/*
 *  SHA1Result
 *
 *  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.
 *
 */
static int SHA1Result( SHA1Context *context,
                uint8_t Message_Digest[SHA1HashSize])
{
    int i;

    if (!context || !Message_Digest)
    {
        return shaNull;
    }

    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;
}

/*
 *  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 SHA context to update.
 *      message_array[ ]: [in]
 *          An array of octets representing the next portion of
 *          the message.
 *      length: [in]
 *          The length of the message in message_array
 *          The length of the message in message_array.
 *
 *  Returns:
 *      sha Error Code.
 *
 */
static int SHA1Input(    SHA1Context    *context,
                  const uint8_t  *message_array,
int SHA1Input(SHA1Context *context,
    const uint8_t *message_array, unsigned length)
                  unsigned       length)
{
    if (!length)
  if (!context) return shaNull;
    {
        return shaSuccess;
  if (!length) return shaSuccess;
    }

    if (!context || !message_array)
    {
        return shaNull;
  if (!message_array) return shaNull;
    }

    if (context->Computed)
  if (context->Computed) return context->Corrupted = shaStateError;
    {
        context->Corrupted = shaStateError;

        return shaStateError;
    }

    if (context->Corrupted)
    {
  if (context->Corrupted) return context->Corrupted;

         return context->Corrupted;
    }
    while(length-- && !context->Corrupted)
  while (length--) {
    {
    context->Message_Block[context->Message_Block_Index++] =
                    (*message_array & 0xFF);
      *message_array;

    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)
    if ((SHA1AddLength(context, 8) == shaSuccess) &&
      (context->Message_Block_Index == SHA1_Message_Block_Size))
    {
        SHA1ProcessMessageBlock(context);
      SHA1ProcessMessageBlock(context);
    }

    message_array++;
    }
  }

  return context->Corrupted;
}

/*
 * SHA1FinalBits
 *
 * Description:
 *   This function will add in any final bits of the message.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update.
 *   message_bits: [in]
 *     The final bits of the message, in the upper portion of the
 *     byte.  (Use 0b###00000 instead of 0b00000### to input the
 *     three bits ###.)
 *   length: [in]
 *     The number of bits in message_bits, between 1 and 7.
 *
 * Returns:
 *   sha Error Code.
 */
int SHA1FinalBits(SHA1Context *context, uint8_t message_bits,
    unsigned int length)
{
  static uint8_t masks[8] = {
      /* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
      /* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
      /* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
      /* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE
  };

  static uint8_t markbit[8] = {
      /* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
      /* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
      /* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
      /* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01
  };

  if (!context) return shaNull;
  if (!length) return shaSuccess;
  if (context->Corrupted) return context->Corrupted;
  if (context->Computed) return context->Corrupted = shaStateError;
  if (length >= 8) return context->Corrupted = shaBadParam;

  SHA1AddLength(context, length);
  SHA1Finalize(context,
    (uint8_t) ((message_bits & masks[length]) | markbit[length]));

  return context->Corrupted;
}

/*
 * SHA1Result
 *
 * 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 element with index 0,
 *      the last octet of hash in the element with index 19.
 *
 * 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 SHA1Result(SHA1Context *context,
    uint8_t Message_Digest[SHA1HashSize])
{
  int i;

  if (!context) return shaNull;
  if (!Message_Digest) return shaNull;
  if (context->Corrupted) return context->Corrupted;

  if (!context->Computed)
    SHA1Finalize(context, 0x80);

  for (i = 0; i < SHA1HashSize; ++i)
    Message_Digest[i] = (uint8_t) (context->Intermediate_Hash[i>>2]
                                   >> (8 * ( 3 - ( i & 0x03 ) )));

    return shaSuccess;
  return shaSuccess;
}

/*
 *  SHA1ProcessMessageBlock
 * SHA1ProcessMessageBlock
 *
 *  Description:
 *      This function will process the next 512 bits of the message
 *      stored in the Message_Block array.
 * Description:
 *   This helper function will process the next 512 bits of the
 *   message stored in the Message_Block array.
 *
 *  Parameters:
 *      None.
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update.
 *
 *  Returns:
 *      Nothing.
 * 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.
 * Comments:
 *   Many of the variable names in this code, especially the
 *   single character names, were used because those were the
 *   names used in the Secure Hash Standard.
 *
 *
 */
static void SHA1ProcessMessageBlock(SHA1Context *context)
{
  /* Constants defined in FIPS 180-3, section 4.2.1 */
    const uint32_t K[] =    {       /* Constants defined in SHA-1   */
                            0x5A827999,
  const uint32_t K[4] = {
      0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6
                            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                */
  };

  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++)
  /*
   * 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];
    }
    W[t]  = ((uint32_t)context->Message_Block[t * 4]) << 24;
    W[t] |= ((uint32_t)context->Message_Block[t * 4 + 1]) << 16;
    W[t] |= ((uint32_t)context->Message_Block[t * 4 + 2]) << 8;
    W[t] |= ((uint32_t)context->Message_Block[t * 4 + 3]);
  }

    for(t = 16; t < 80; t++)
  for (t = 16; t < 80; t++)
    {
       W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
    W[t] = SHA1_ROTL(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];
  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++)
  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;
    }
    temp = SHA1_ROTL(5,A) + SHA_Ch(B, C, D) + E + W[t] + K[0];
    E = D;
    D = C;
    C = SHA1_ROTL(30,B);
    B = A;
    A = temp;
  }

    for(t = 20; t < 40; t++)
  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;
    }
    temp = SHA1_ROTL(5,A) + SHA_Parity(B, C, D) + E + W[t] + K[1];
    E = D;
    D = C;
    C = SHA1_ROTL(30,B);
    B = A;
    A = temp;
  }

    for(t = 40; t < 60; t++)
  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;
    }
    temp = SHA1_ROTL(5,A) + SHA_Maj(B, C, D) + E + W[t] + K[2];
    E = D;
    D = C;
    C = SHA1_ROTL(30,B);
    B = A;
    A = temp;
  }

    for(t = 60; t < 80; t++)
  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;
    }
    temp = SHA1_ROTL(5,A) + SHA_Parity(B, C, D) + E + W[t] + K[3];
    E = D;
    D = C;
    C = SHA1_ROTL(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->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;
  context->Message_Block_Index = 0;
}

/*
 * SHA1Finalize

 *
 * Description:
 *   This helper function finishes off the digest calculations.
 *
 * Parameters:
 *   context: [in/out]
 *     The SHA context to update.
 *   Pad_Byte: [in]
 *     The last byte to add to the message block before the 0-padding
 *     and length.  This will contain the last bits of the message
 *     followed by another single bit.  If the message was an
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
 *
 * Returns:
 *   sha Error Code.
 *
 */
static void SHA1Finalize(SHA1Context *context, uint8_t Pad_Byte)
{
  int i;
  SHA1PadMessage(context, Pad_Byte);
  /* message may be sensitive, clear it out */
  for (i = 0; i < SHA1_Message_Block_Size; ++i)
    context->Message_Block[i] = 0;
  context->Length_High = 0;     /* and clear length */
  context->Length_Low = 0;
  context->Computed = 1;
}

/*
 *  SHA1PadMessage
 * 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
 * Description:
 *   According to the standard, the message must be padded to the next
 *   even multiple of 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 helper function will pad
 *   the message according to those rules by filling the Message_Block
 *      accordingly.  It will also call the ProcessMessageBlock function
 *      provided appropriately.  When it returns, it can be assumed that
 *      the message digest has been computed.
 *   array accordingly.  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.
 * Parameters:
 *   context: [in/out]
 *     The context to pad.
 *   Pad_Byte: [in]
 *     The last byte to add to the message block before the 0-padding
 *     and length.  This will contain the last bits of the message
 *     followed by another single bit.  If the message was an
 *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
 *
 * Returns:
 *   Nothing.
 *
 */

static void SHA1PadMessage(SHA1Context *context)
static void SHA1PadMessage(SHA1Context *context, uint8_t Pad_Byte)
{
    /*
     *  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)
  /*
   * 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 >= (SHA1_Message_Block_Size - 8)) {
    {
        context->Message_Block[context->Message_Block_Index++] = 0x80;
    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
        while(context->Message_Block_Index < 64)
        {
            context->Message_Block[context->Message_Block_Index++] = 0;
        }

        SHA1ProcessMessageBlock(context);

        while(context->Message_Block_Index < 56)
    while (context->Message_Block_Index < SHA1_Message_Block_Size)
        {
            context->Message_Block[context->Message_Block_Index++] = 0;
        }
      context->Message_Block[context->Message_Block_Index++] = 0;

    }
    else
    SHA1ProcessMessageBlock(context);
  } else
    {
        context->Message_Block[context->Message_Block_Index++] = 0x80;
    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
        while(context->Message_Block_Index < 56)
        {
            context->Message_Block[context->Message_Block_Index++] = 0;
        }

  while (context->Message_Block_Index < (SHA1_Message_Block_Size - 8))
    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;
  /*
   * Store the message length as the last 8 octets
   */
  context->Message_Block[56] = (uint8_t) (context->Length_High >> 24);
  context->Message_Block[57] = (uint8_t) (context->Length_High >> 16);
  context->Message_Block[58] = (uint8_t) (context->Length_High >> 8);
  context->Message_Block[59] = (uint8_t) (context->Length_High);
  context->Message_Block[60] = (uint8_t) (context->Length_Low >> 24);
  context->Message_Block[61] = (uint8_t) (context->Length_Low >> 16);
  context->Message_Block[62] = (uint8_t) (context->Length_Low >> 8);
  context->Message_Block[63] = (uint8_t) (context->Length_Low);

    SHA1ProcessMessageBlock(context);
  SHA1ProcessMessageBlock(context);
}