LCOV - code coverage report
Current view: top level - common/utils - sha224-256.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 101 118 85.6 %
Date: 2021-10-27 03:06:47 Functions: 11 13 84.6 %

          Line data    Source code
       1             : /************************* sha224-256.c ************************/
       2             : /***************** See RFC 6234 for details. *******************/
       3             : /* Copyright (c) 2011 IETF Trust and the persons identified as */
       4             : /* authors of the code.  All rights reserved.                  */
       5             : /* See sha.h for terms of use and redistribution.              */
       6             : 
       7             : /*
       8             :  * Description:
       9             :  *   This file implements the Secure Hash Algorithms SHA-224 and
      10             :  *   SHA-256 as defined in the U.S. National Institute of Standards
      11             :  *   and Technology Federal Information Processing Standards
      12             :  *   Publication (FIPS PUB) 180-3 published in October 2008
      13             :  *   and formerly defined in its predecessors, FIPS PUB 180-1
      14             :  *   and FIP PUB 180-2.
      15             :  *
      16             :  *   A combined document showing all algorithms is available at
      17             :  *       http://csrc.nist.gov/publications/fips/
      18             :  *              fips180-3/fips180-3_final.pdf
      19             :  *
      20             :  *   The SHA-224 and SHA-256 algorithms produce 224-bit and 256-bit
      21             :  *   message digests for a given data stream.  It should take about
      22             :  *   2**n steps to find a message with the same digest as a given
      23             :  *   message and 2**(n/2) to find any two messages with the same
      24             :  *   digest, when n is the digest size in bits.  Therefore, this
      25             :  *   algorithm can serve as a means of providing a
      26             :  *   "fingerprint" for a message.
      27             :  *
      28             :  * Portability Issues:
      29             :  *   SHA-224 and SHA-256 are defined in terms of 32-bit "words".
      30             :  *   This code uses <stdint.h> (included via "sha.h") to define 32-
      31             :  *   and 8-bit unsigned integer types.  If your C compiler does not
      32             :  *   support 32-bit unsigned integers, this code is not
      33             :  *   appropriate.
      34             :  *
      35             :  * Caveats:
      36             :  *   SHA-224 and SHA-256 are designed to work with messages less
      37             :  *   than 2^64 bits long.  This implementation uses SHA224/256Input()
      38             :  *   to hash the bits that are a multiple of the size of an 8-bit
      39             :  *   octet, and then optionally uses SHA224/256FinalBits()
      40             :  *   to hash the final few bits of the input.
      41             :  */
      42             : 
      43             : #include "sha.h"
      44             : #include "sha-private.h"
      45             : 
      46             : /* Define the SHA shift, rotate left, and rotate right macros */
      47             : #define SHA256_SHR(bits,word)      ((word) >> (bits))
      48             : #define SHA256_ROTL(bits,word)                         \
      49             :   (((word) << (bits)) | ((word) >> (32-(bits))))
      50             : #define SHA256_ROTR(bits,word)                         \
      51             :   (((word) >> (bits)) | ((word) << (32-(bits))))
      52             : 
      53             : /* Define the SHA SIGMA and sigma macros */
      54             : #define SHA256_SIGMA0(word)   \
      55             :   (SHA256_ROTR( 2,word) ^ SHA256_ROTR(13,word) ^ SHA256_ROTR(22,word))
      56             : #define SHA256_SIGMA1(word)   \
      57             :   (SHA256_ROTR( 6,word) ^ SHA256_ROTR(11,word) ^ SHA256_ROTR(25,word))
      58             : #define SHA256_sigma0(word)   \
      59             :   (SHA256_ROTR( 7,word) ^ SHA256_ROTR(18,word) ^ SHA256_SHR( 3,word))
      60             : #define SHA256_sigma1(word)   \
      61             :   (SHA256_ROTR(17,word) ^ SHA256_ROTR(19,word) ^ SHA256_SHR(10,word))
      62             : 
      63             : /*
      64             :  * Add "length" to the length.
      65             :  * Set Corrupted when overflow has occurred.
      66             :  */
      67             : static uint32_t addTemp;
      68             : #define SHA224_256AddLength(context, length)               \
      69             :   (addTemp = (context)->Length_Low, (context)->Corrupted = \
      70             :     (((context)->Length_Low += (length)) < addTemp) &&     \
      71             :     (++(context)->Length_High == 0) ? shaInputTooLong :    \
      72             :                                       (context)->Corrupted )
      73             : 
      74             : /* Local Function Prototypes */
      75             : static int SHA224_256Reset(SHA256Context *context, uint32_t *H0);
      76             : static void SHA224_256ProcessMessageBlock(SHA256Context *context);
      77             : static void SHA224_256Finalize(SHA256Context *context,
      78             :   uint8_t Pad_Byte);
      79             : static void SHA224_256PadMessage(SHA256Context *context,
      80             :   uint8_t Pad_Byte);
      81             : static int SHA224_256ResultN(SHA256Context *context,
      82             :   uint8_t Message_Digest[ ], int HashSize);
      83             : 
      84             : /* Initial Hash Values: FIPS 180-3 section 5.3.2 */
      85             : static uint32_t SHA224_H0[SHA256HashSize/4] = {
      86             :     0xC1059ED8, 0x367CD507, 0x3070DD17, 0xF70E5939,
      87             :     0xFFC00B31, 0x68581511, 0x64F98FA7, 0xBEFA4FA4
      88             : };
      89             : 
      90             : /* Initial Hash Values: FIPS 180-3 section 5.3.3 */
      91             : static uint32_t SHA256_H0[SHA256HashSize/4] = {
      92             :   0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
      93             :   0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
      94             : };
      95             : 
      96             : /*
      97             :  * SHA224Reset
      98             :  *
      99             :  * Description:
     100             :  *   This function will initialize the SHA224Context in preparation
     101             :  *   for computing a new SHA224 message digest.
     102             :  *
     103             :  * Parameters:
     104             :  *   context: [in/out]
     105             :  *     The context to reset.
     106             :  *
     107             :  * Returns:
     108             :  *   sha Error Code.
     109             :  */
     110           1 : int SHA224Reset(SHA224Context *context)
     111             : {
     112           1 :   return SHA224_256Reset(context, SHA224_H0);
     113             : }
     114             : 
     115             : /*
     116             :  * SHA224Input
     117             :  *
     118             :  * Description:
     119             :  *   This function accepts an array of octets as the next portion
     120             :  *   of the message.
     121             :  *
     122             :  * Parameters:
     123             :  *   context: [in/out]
     124             :  *     The SHA context to update.
     125             :  *   message_array[ ]: [in]
     126             :  *     An array of octets representing the next portion of
     127             :  *     the message.
     128             :  *   length: [in]
     129             :  *     The length of the message in message_array.
     130             :  *
     131             :  * Returns:
     132             :  *   sha Error Code.
     133             :  *
     134             :  */
     135           1 : int SHA224Input(SHA224Context *context, const uint8_t *message_array,
     136             :     unsigned int length)
     137             : {
     138           1 :   return SHA256Input(context, message_array, length);
     139             : }
     140             : 
     141             : /*
     142             :  * SHA224FinalBits
     143             :  *
     144             :  * Description:
     145             :  *   This function will add in any final bits of the message.
     146             :  *
     147             :  * Parameters:
     148             :  *   context: [in/out]
     149             :  *     The SHA context to update.
     150             :  *   message_bits: [in]
     151             :  *     The final bits of the message, in the upper portion of the
     152             :  *     byte.  (Use 0b###00000 instead of 0b00000### to input the
     153             :  *     three bits ###.)
     154             :  *   length: [in]
     155             :  *     The number of bits in message_bits, between 1 and 7.
     156             :  *
     157             :  * Returns:
     158             :  *   sha Error Code.
     159             :  */
     160           0 : int SHA224FinalBits(SHA224Context *context,
     161             :                     uint8_t message_bits, unsigned int length)
     162             : {
     163           0 :   return SHA256FinalBits(context, message_bits, length);
     164             : }
     165             : 
     166             : /*
     167             :  * SHA224Result
     168             :  *
     169             :  * Description:
     170             :  *   This function will return the 224-bit message digest
     171             :  *   into the Message_Digest array provided by the caller.
     172             :  *   NOTE:
     173             :  *    The first octet of hash is stored in the element with index 0,
     174             :  *    the last octet of hash in the element with index 27.
     175             :  *
     176             :  * Parameters:
     177             :  *   context: [in/out]
     178             :  *     The context to use to calculate the SHA hash.
     179             :  *   Message_Digest[ ]: [out]
     180             :  *     Where the digest is returned.
     181             :  *
     182             :  * Returns:
     183             :  *   sha Error Code.
     184             :  */
     185           1 : int SHA224Result(SHA224Context *context,
     186             :     uint8_t Message_Digest[SHA224HashSize])
     187             : {
     188           1 :   return SHA224_256ResultN(context, Message_Digest, SHA224HashSize);
     189             : }
     190             : 
     191             : /*
     192             :  * SHA256Reset
     193             :  *
     194             :  * Description:
     195             :  *   This function will initialize the SHA256Context in preparation
     196             :  *   for computing a new SHA256 message digest.
     197             :  *
     198             :  * Parameters:
     199             :  *   context: [in/out]
     200             :  *     The context to reset.
     201             :  *
     202             :  * Returns:
     203             :  *   sha Error Code.
     204             :  */
     205           1 : int SHA256Reset(SHA256Context *context)
     206             : {
     207           1 :   return SHA224_256Reset(context, SHA256_H0);
     208             : }
     209             : 
     210             : /*
     211             :  * SHA256Input
     212             :  *
     213             :  * Description:
     214             :  *   This function accepts an array of octets as the next portion
     215             :  *   of the message.
     216             :  *
     217             :  * Parameters:
     218             :  *   context: [in/out]
     219             :  *     The SHA context to update.
     220             :  *   message_array[ ]: [in]
     221             :  *     An array of octets representing the next portion of
     222             :  *     the message.
     223             :  *   length: [in]
     224             :  *     The length of the message in message_array.
     225             :  *
     226             :  * Returns:
     227             :  *   sha Error Code.
     228             :  */
     229           2 : int SHA256Input(SHA256Context *context, const uint8_t *message_array,
     230             :     unsigned int length)
     231             : {
     232           2 :   if (!context) return shaNull;
     233           2 :   if (!length) return shaSuccess;
     234           2 :   if (!message_array) return shaNull;
     235           2 :   if (context->Computed) return context->Corrupted = shaStateError;
     236           2 :   if (context->Corrupted) return context->Corrupted;
     237             : 
     238          16 :   while (length--) {
     239          14 :     context->Message_Block[context->Message_Block_Index++] =
     240          14 :             *message_array;
     241             : 
     242          14 :     if ((SHA224_256AddLength(context, 8) == shaSuccess) &&
     243             :       (context->Message_Block_Index == SHA256_Message_Block_Size))
     244           0 :       SHA224_256ProcessMessageBlock(context);
     245             : 
     246          14 :     message_array++;
     247             :   }
     248             : 
     249           2 :   return context->Corrupted;
     250             : 
     251             : }
     252             : 
     253             : /*
     254             :  * SHA256FinalBits
     255             :  *
     256             :  * Description:
     257             :  *   This function will add in any final bits of the message.
     258             :  *
     259             :  * Parameters:
     260             :  *   context: [in/out]
     261             :  *     The SHA context to update.
     262             :  *   message_bits: [in]
     263             :  *     The final bits of the message, in the upper portion of the
     264             :  *     byte.  (Use 0b###00000 instead of 0b00000### to input the
     265             :  *     three bits ###.)
     266             :  *   length: [in]
     267             :  *     The number of bits in message_bits, between 1 and 7.
     268             :  *
     269             :  * Returns:
     270             :  *   sha Error Code.
     271             :  */
     272           0 : int SHA256FinalBits(SHA256Context *context,
     273             :                     uint8_t message_bits, unsigned int length)
     274             : {
     275             :   static uint8_t masks[8] = {
     276             :       /* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
     277             :       /* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
     278             :       /* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
     279             :       /* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE
     280             :   };
     281             :   static uint8_t markbit[8] = {
     282             :       /* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
     283             :       /* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
     284             :       /* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
     285             :       /* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01
     286             :   };
     287             : 
     288           0 :   if (!context) return shaNull;
     289           0 :   if (!length) return shaSuccess;
     290           0 :   if (context->Corrupted) return context->Corrupted;
     291           0 :   if (context->Computed) return context->Corrupted = shaStateError;
     292           0 :   if (length >= 8) return context->Corrupted = shaBadParam;
     293             : 
     294           0 :   SHA224_256AddLength(context, length);
     295           0 :   SHA224_256Finalize(context, (uint8_t)
     296           0 :     ((message_bits & masks[length]) | markbit[length]));
     297             : 
     298           0 :   return context->Corrupted;
     299             : }
     300             : 
     301             : /*
     302             :  * SHA256Result
     303             :  *
     304             :  * Description:
     305             :  *   This function will return the 256-bit message digest
     306             :  *   into the Message_Digest array provided by the caller.
     307             :  *   NOTE:
     308             :  *    The first octet of hash is stored in the element with index 0,
     309             :  *    the last octet of hash in the element with index 31.
     310             :  *
     311             :  * Parameters:
     312             :  *   context: [in/out]
     313             :  *     The context to use to calculate the SHA hash.
     314             :  *   Message_Digest[ ]: [out]
     315             :  *     Where the digest is returned.
     316             :  *
     317             :  * Returns:
     318             :  *   sha Error Code.
     319             :  */
     320           1 : int SHA256Result(SHA256Context *context,
     321             :                  uint8_t Message_Digest[SHA256HashSize])
     322             : {
     323           1 :   return SHA224_256ResultN(context, Message_Digest, SHA256HashSize);
     324             : }
     325             : 
     326             : /*
     327             :  * SHA224_256Reset
     328             :  *
     329             :  * Description:
     330             :  *   This helper function will initialize the SHA256Context in
     331             :  *   preparation for computing a new SHA-224 or SHA-256 message digest.
     332             :  *
     333             :  * Parameters:
     334             :  *   context: [in/out]
     335             :  *     The context to reset.
     336             :  *   H0[ ]: [in]
     337             :  *     The initial hash value array to use.
     338             :  *
     339             :  * Returns:
     340             :  *   sha Error Code.
     341             :  */
     342           2 : static int SHA224_256Reset(SHA256Context *context, uint32_t *H0)
     343             : {
     344           2 :   if (!context) return shaNull;
     345             : 
     346           2 :   context->Length_High = context->Length_Low = 0;
     347           2 :   context->Message_Block_Index  = 0;
     348             : 
     349           2 :   context->Intermediate_Hash[0] = H0[0];
     350           2 :   context->Intermediate_Hash[1] = H0[1];
     351           2 :   context->Intermediate_Hash[2] = H0[2];
     352           2 :   context->Intermediate_Hash[3] = H0[3];
     353           2 :   context->Intermediate_Hash[4] = H0[4];
     354           2 :   context->Intermediate_Hash[5] = H0[5];
     355           2 :   context->Intermediate_Hash[6] = H0[6];
     356           2 :   context->Intermediate_Hash[7] = H0[7];
     357             : 
     358           2 :   context->Computed  = 0;
     359           2 :   context->Corrupted = shaSuccess;
     360             : 
     361           2 :   return shaSuccess;
     362             : }
     363             : 
     364             : /*
     365             :  * SHA224_256ProcessMessageBlock
     366             :  *
     367             :  * Description:
     368             :  *   This helper function will process the next 512 bits of the
     369             :  *   message stored in the Message_Block array.
     370             :  *
     371             :  * Parameters:
     372             :  *   context: [in/out]
     373             :  *     The SHA context to update.
     374             :  *
     375             :  * Returns:
     376             :  *   Nothing.
     377             :  *
     378             :  * Comments:
     379             :  *   Many of the variable names in this code, especially the
     380             :  *   single character names, were used because those were the
     381             :  *   names used in the Secure Hash Standard.
     382             :  */
     383           2 : static void SHA224_256ProcessMessageBlock(SHA256Context *context)
     384             : {
     385             :   /* Constants defined in FIPS 180-3, section 4.2.2 */
     386             :   static const uint32_t K[64] = {
     387             :       0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
     388             :       0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
     389             :       0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
     390             :       0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
     391             :       0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
     392             :       0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
     393             :       0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
     394             :       0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
     395             :       0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
     396             :       0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
     397             :       0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
     398             :       0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
     399             :       0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
     400             :   };
     401             :   int        t, t4;                   /* Loop counter */
     402             :   uint32_t   temp1, temp2;            /* Temporary word value */
     403             :   uint32_t   W[64];                   /* Word sequence */
     404             :   uint32_t   A, B, C, D, E, F, G, H;  /* Word buffers */
     405             : 
     406             :   /*
     407             :    * Initialize the first 16 words in the array W
     408             :    */
     409          34 :   for (t = t4 = 0; t < 16; t++, t4 += 4)
     410          32 :     W[t] = (((uint32_t)context->Message_Block[t4]) << 24) |
     411          32 :            (((uint32_t)context->Message_Block[t4 + 1]) << 16) |
     412          32 :            (((uint32_t)context->Message_Block[t4 + 2]) << 8) |
     413          32 :            (((uint32_t)context->Message_Block[t4 + 3]));
     414             : 
     415          98 :   for (t = 16; t < 64; t++)
     416          96 :     W[t] = SHA256_sigma1(W[t-2]) + W[t-7] +
     417          96 :         SHA256_sigma0(W[t-15]) + W[t-16];
     418             : 
     419           2 :   A = context->Intermediate_Hash[0];
     420           2 :   B = context->Intermediate_Hash[1];
     421           2 :   C = context->Intermediate_Hash[2];
     422           2 :   D = context->Intermediate_Hash[3];
     423           2 :   E = context->Intermediate_Hash[4];
     424           2 :   F = context->Intermediate_Hash[5];
     425           2 :   G = context->Intermediate_Hash[6];
     426           2 :   H = context->Intermediate_Hash[7];
     427             : 
     428         130 :   for (t = 0; t < 64; t++) {
     429         128 :     temp1 = H + SHA256_SIGMA1(E) + SHA_Ch(E,F,G) + K[t] + W[t];
     430         128 :     temp2 = SHA256_SIGMA0(A) + SHA_Maj(A,B,C);
     431             :     H = G;
     432             :     G = F;
     433             :     F = E;
     434         128 :     E = D + temp1;
     435             :     D = C;
     436             :     C = B;
     437             :     B = A;
     438         128 :     A = temp1 + temp2;
     439             :   }
     440             : 
     441           2 :   context->Intermediate_Hash[0] += A;
     442           2 :   context->Intermediate_Hash[1] += B;
     443           2 :   context->Intermediate_Hash[2] += C;
     444           2 :   context->Intermediate_Hash[3] += D;
     445           2 :   context->Intermediate_Hash[4] += E;
     446           2 :   context->Intermediate_Hash[5] += F;
     447           2 :   context->Intermediate_Hash[6] += G;
     448           2 :   context->Intermediate_Hash[7] += H;
     449             : 
     450           2 :   context->Message_Block_Index = 0;
     451           2 : }
     452             : 
     453             : /*
     454             :  * SHA224_256Finalize
     455             :  *
     456             :  * Description:
     457             :  *   This helper function finishes off the digest calculations.
     458             :  *
     459             :  * Parameters:
     460             :  *   context: [in/out]
     461             :  *     The SHA context to update.
     462             :  *   Pad_Byte: [in]
     463             :  *     The last byte to add to the message block before the 0-padding
     464             :  *     and length.  This will contain the last bits of the message
     465             :  *     followed by another single bit.  If the message was an
     466             :  *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
     467             :  *
     468             :  * Returns:
     469             :  *   sha Error Code.
     470             :  */
     471           2 : static void SHA224_256Finalize(SHA256Context *context,
     472             :     uint8_t Pad_Byte)
     473             : {
     474             :   int i;
     475           2 :   SHA224_256PadMessage(context, Pad_Byte);
     476             :   /* message may be sensitive, so clear it out */
     477         130 :   for (i = 0; i < SHA256_Message_Block_Size; ++i)
     478         128 :     context->Message_Block[i] = 0;
     479           2 :   context->Length_High = 0;     /* and clear length */
     480           2 :   context->Length_Low = 0;
     481           2 :   context->Computed = 1;
     482           2 : }
     483             : 
     484             : /*
     485             :  * SHA224_256PadMessage
     486             :  *
     487             :  * Description:
     488             :  *   According to the standard, the message must be padded to the next
     489             :  *   even multiple of 512 bits.  The first padding bit must be a '1'.
     490             :  *   The last 64 bits represent the length of the original message.
     491             :  *   All bits in between should be 0.  This helper function will pad
     492             :  *   the message according to those rules by filling the
     493             :  *   Message_Block array accordingly.  When it returns, it can be
     494             :  *   assumed that the message digest has been computed.
     495             :  *
     496             :  * Parameters:
     497             :  *   context: [in/out]
     498             :  *     The context to pad.
     499             :  *   Pad_Byte: [in]
     500             :  *     The last byte to add to the message block before the 0-padding
     501             :  *     and length.  This will contain the last bits of the message
     502             :  *     followed by another single bit.  If the message was an
     503             :  *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
     504             :  *
     505             :  * Returns:
     506             :  *   Nothing.
     507             :  */
     508           2 : static void SHA224_256PadMessage(SHA256Context *context,
     509             :     uint8_t Pad_Byte)
     510             : {
     511             :   /*
     512             :    * Check to see if the current message block is too small to hold
     513             :    * the initial padding bits and length.  If so, we will pad the
     514             :    * block, process it, and then continue padding into a second
     515             :    * block.
     516             :    */
     517           2 :   if (context->Message_Block_Index >= (SHA256_Message_Block_Size-8)) {
     518           0 :     context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
     519           0 :     while (context->Message_Block_Index < SHA256_Message_Block_Size)
     520           0 :       context->Message_Block[context->Message_Block_Index++] = 0;
     521           0 :     SHA224_256ProcessMessageBlock(context);
     522             :   } else
     523           2 :     context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
     524             : 
     525          98 :   while (context->Message_Block_Index < (SHA256_Message_Block_Size-8))
     526          96 :     context->Message_Block[context->Message_Block_Index++] = 0;
     527             : 
     528             :   /*
     529             :    * Store the message length as the last 8 octets
     530             :    */
     531           2 :   context->Message_Block[56] = (uint8_t)(context->Length_High >> 24);
     532           2 :   context->Message_Block[57] = (uint8_t)(context->Length_High >> 16);
     533           2 :   context->Message_Block[58] = (uint8_t)(context->Length_High >> 8);
     534           2 :   context->Message_Block[59] = (uint8_t)(context->Length_High);
     535           2 :   context->Message_Block[60] = (uint8_t)(context->Length_Low >> 24);
     536           2 :   context->Message_Block[61] = (uint8_t)(context->Length_Low >> 16);
     537           2 :   context->Message_Block[62] = (uint8_t)(context->Length_Low >> 8);
     538           2 :   context->Message_Block[63] = (uint8_t)(context->Length_Low);
     539             : 
     540           2 :   SHA224_256ProcessMessageBlock(context);
     541           2 : }
     542             : 
     543             : /*
     544             :  * SHA224_256ResultN
     545             :  *
     546             :  * Description:
     547             :  *   This helper function will return the 224-bit or 256-bit message
     548             :  *   digest into the Message_Digest array provided by the caller.
     549             :  *   NOTE:
     550             :  *    The first octet of hash is stored in the element with index 0,
     551             :  *    the last octet of hash in the element with index 27/31.
     552             :  *
     553             :  * Parameters:
     554             :  *   context: [in/out]
     555             :  *     The context to use to calculate the SHA hash.
     556             :  *   Message_Digest[ ]: [out]
     557             :  *     Where the digest is returned.
     558             :  *   HashSize: [in]
     559             :  *     The size of the hash, either 28 or 32.
     560             :  *
     561             :  * Returns:
     562             :  *   sha Error Code.
     563             :  */
     564           2 : static int SHA224_256ResultN(SHA256Context *context,
     565             :     uint8_t Message_Digest[ ], int HashSize)
     566             : {
     567             :   int i;
     568             : 
     569           2 :   if (!context) return shaNull;
     570           2 :   if (!Message_Digest) return shaNull;
     571           2 :   if (context->Corrupted) return context->Corrupted;
     572             : 
     573           2 :   if (!context->Computed)
     574           2 :     SHA224_256Finalize(context, 0x80);
     575             : 
     576          62 :   for (i = 0; i < HashSize; ++i)
     577          60 :     Message_Digest[i] = (uint8_t)
     578          60 :       (context->Intermediate_Hash[i>>2] >> 8 * ( 3 - ( i & 0x03 ) ));
     579             : 
     580             :   return shaSuccess;
     581             : }

Generated by: LCOV version 1.14