FreeBSD/Linux Kernel Cross Reference
sys/crypto/sha2/sha512c.c

     /*-
      * Copyright 2005 Colin Percival
      * Copyright (c) 2015 Allan Jude <allanjude@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. 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 AUTHOR 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 AUTHOR 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/endian.h>
    #include <sys/types.h>
    
    #ifdef _KERNEL
    #include <sys/systm.h>
    #else
    #include <string.h>
    #endif
    
    #include "sha512.h"
    #include "sha512t.h"
    #include "sha384.h"
    
    #if BYTE_ORDER == BIG_ENDIAN
    
    /* Copy a vector of big-endian uint64_t into a vector of bytes */
    #define be64enc_vect(dst, src, len)     \
            memcpy((void *)dst, (const void *)src, (size_t)len)
    
    /* Copy a vector of bytes into a vector of big-endian uint64_t */
    #define be64dec_vect(dst, src, len)     \
            memcpy((void *)dst, (const void *)src, (size_t)len)
    
    #else /* BYTE_ORDER != BIG_ENDIAN */
    
    /*
     * Encode a length len/4 vector of (uint64_t) into a length len vector of
     * (unsigned char) in big-endian form.  Assumes len is a multiple of 8.
     */
    static void
    be64enc_vect(unsigned char *dst, const uint64_t *src, size_t len)
    {
            size_t i;
    
            for (i = 0; i < len / 8; i++)
                    be64enc(dst + i * 8, src[i]);
    }
    
    /*
     * Decode a big-endian length len vector of (unsigned char) into a length
     * len/4 vector of (uint64_t).  Assumes len is a multiple of 8.
     */
    static void
    be64dec_vect(uint64_t *dst, const unsigned char *src, size_t len)
    {
            size_t i;
    
            for (i = 0; i < len / 8; i++)
                    dst[i] = be64dec(src + i * 8);
    }
    
    #endif /* BYTE_ORDER != BIG_ENDIAN */
    
    /* SHA512 round constants. */
    static const uint64_t K[80] = {
            0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
            0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
            0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
            0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
            0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
            0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
            0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
            0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
            0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
            0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
            0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
            0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
            0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
            0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
           0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
           0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
           0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
           0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
           0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
           0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
           0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
           0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
           0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
           0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
           0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
           0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
           0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
           0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
           0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
           0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
           0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
           0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
           0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
           0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
           0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
           0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
           0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
           0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
           0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
           0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
   };
   
   /* Elementary functions used by SHA512 */
   #define Ch(x, y, z)     ((x & (y ^ z)) ^ z)
   #define Maj(x, y, z)    ((x & (y | z)) | (y & z))
   #define SHR(x, n)       (x >> n)
   #define ROTR(x, n)      ((x >> n) | (x << (64 - n)))
   #define S0(x)           (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
   #define S1(x)           (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))
   #define s0(x)           (ROTR(x, 1) ^ ROTR(x, 8) ^ SHR(x, 7))
   #define s1(x)           (ROTR(x, 19) ^ ROTR(x, 61) ^ SHR(x, 6))
   
   /* SHA512 round function */
   #define RND(a, b, c, d, e, f, g, h, k)                  \
           h += S1(e) + Ch(e, f, g) + k;                   \
           d += h;                                         \
           h += S0(a) + Maj(a, b, c);
   
   /* Adjusted round function for rotating state */
   #define RNDr(S, W, i, ii)                       \
           RND(S[(80 - i) % 8], S[(81 - i) % 8],   \
               S[(82 - i) % 8], S[(83 - i) % 8],   \
               S[(84 - i) % 8], S[(85 - i) % 8],   \
               S[(86 - i) % 8], S[(87 - i) % 8],   \
               W[i + ii] + K[i + ii])
   
   /* Message schedule computation */
   #define MSCH(W, ii, i)                          \
           W[i + ii + 16] = s1(W[i + ii + 14]) + W[i + ii + 9] + s0(W[i + ii + 1]) + W[i + ii]
   
   /*
    * SHA512 block compression function.  The 512-bit state is transformed via
    * the 512-bit input block to produce a new state.
    */
   static void
   SHA512_Transform(uint64_t * state, const unsigned char block[SHA512_BLOCK_LENGTH])
   {
           uint64_t W[80];
           uint64_t S[8];
           int i;
   
           /* 1. Prepare the first part of the message schedule W. */
           be64dec_vect(W, block, SHA512_BLOCK_LENGTH);
   
           /* 2. Initialize working variables. */
           memcpy(S, state, SHA512_DIGEST_LENGTH);
   
           /* 3. Mix. */
           for (i = 0; i < 80; i += 16) {
                   RNDr(S, W, 0, i);
                   RNDr(S, W, 1, i);
                   RNDr(S, W, 2, i);
                   RNDr(S, W, 3, i);
                   RNDr(S, W, 4, i);
                   RNDr(S, W, 5, i);
                   RNDr(S, W, 6, i);
                   RNDr(S, W, 7, i);
                   RNDr(S, W, 8, i);
                   RNDr(S, W, 9, i);
                   RNDr(S, W, 10, i);
                   RNDr(S, W, 11, i);
                   RNDr(S, W, 12, i);
                   RNDr(S, W, 13, i);
                   RNDr(S, W, 14, i);
                   RNDr(S, W, 15, i);
   
                   if (i == 64)
                           break;
                   MSCH(W, 0, i);
                   MSCH(W, 1, i);
                   MSCH(W, 2, i);
                   MSCH(W, 3, i);
                   MSCH(W, 4, i);
                   MSCH(W, 5, i);
                   MSCH(W, 6, i);
                   MSCH(W, 7, i);
                   MSCH(W, 8, i);
                   MSCH(W, 9, i);
                   MSCH(W, 10, i);
                   MSCH(W, 11, i);
                   MSCH(W, 12, i);
                   MSCH(W, 13, i);
                   MSCH(W, 14, i);
                   MSCH(W, 15, i);
           }
   
           /* 4. Mix local working variables into global state */
           for (i = 0; i < 8; i++)
                   state[i] += S[i];
   }
   
   static unsigned char PAD[SHA512_BLOCK_LENGTH] = {
           0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
           0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
           0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
           0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
           0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
           0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
           0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
           0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
   };
   
   /* Add padding and terminating bit-count. */
   static void
   SHA512_Pad(SHA512_CTX * ctx)
   {
           size_t r;
   
           /* Figure out how many bytes we have buffered. */
           r = (ctx->count[1] >> 3) & 0x7f;
   
           /* Pad to 112 mod 128, transforming if we finish a block en route. */
           if (r < 112) {
                   /* Pad to 112 mod 128. */
                   memcpy(&ctx->buf[r], PAD, 112 - r);
           } else {
                   /* Finish the current block and mix. */
                   memcpy(&ctx->buf[r], PAD, 128 - r);
                   SHA512_Transform(ctx->state, ctx->buf);
   
                   /* The start of the final block is all zeroes. */
                   memset(&ctx->buf[0], 0, 112);
           }
   
           /* Add the terminating bit-count. */
           be64enc_vect(&ctx->buf[112], ctx->count, 16);
   
           /* Mix in the final block. */
           SHA512_Transform(ctx->state, ctx->buf);
   }
   
   /* SHA-512 initialization.  Begins a SHA-512 operation. */
   void
   SHA512_Init(SHA512_CTX * ctx)
   {
   
           /* Zero bits processed so far */
           ctx->count[0] = ctx->count[1] = 0;
   
           /* Magic initialization constants */
           ctx->state[0] = 0x6a09e667f3bcc908ULL;
           ctx->state[1] = 0xbb67ae8584caa73bULL;
           ctx->state[2] = 0x3c6ef372fe94f82bULL;
           ctx->state[3] = 0xa54ff53a5f1d36f1ULL;
           ctx->state[4] = 0x510e527fade682d1ULL;
           ctx->state[5] = 0x9b05688c2b3e6c1fULL;
           ctx->state[6] = 0x1f83d9abfb41bd6bULL;
           ctx->state[7] = 0x5be0cd19137e2179ULL;
   }
   
   /* Add bytes into the hash */
   void
   SHA512_Update(SHA512_CTX * ctx, const void *in, size_t len)
   {
           uint64_t bitlen[2];
           uint64_t r;
           const unsigned char *src = in;
   
           /* Number of bytes left in the buffer from previous updates */
           r = (ctx->count[1] >> 3) & 0x7f;
   
           /* Convert the length into a number of bits */
           bitlen[1] = ((uint64_t)len) << 3;
           bitlen[0] = ((uint64_t)len) >> 61;
   
           /* Update number of bits */
           if ((ctx->count[1] += bitlen[1]) < bitlen[1])
                   ctx->count[0]++;
           ctx->count[0] += bitlen[0];
   
           /* Handle the case where we don't need to perform any transforms */
           if (len < SHA512_BLOCK_LENGTH - r) {
                   memcpy(&ctx->buf[r], src, len);
                   return;
           }
   
           /* Finish the current block */
           memcpy(&ctx->buf[r], src, SHA512_BLOCK_LENGTH - r);
           SHA512_Transform(ctx->state, ctx->buf);
           src += SHA512_BLOCK_LENGTH - r;
           len -= SHA512_BLOCK_LENGTH - r;
   
           /* Perform complete blocks */
           while (len >= SHA512_BLOCK_LENGTH) {
                   SHA512_Transform(ctx->state, src);
                   src += SHA512_BLOCK_LENGTH;
                   len -= SHA512_BLOCK_LENGTH;
           }
   
           /* Copy left over data into buffer */
           memcpy(ctx->buf, src, len);
   }
   
   /*
    * SHA-512 finalization.  Pads the input data, exports the hash value,
    * and clears the context state.
    */
   void
   SHA512_Final(unsigned char digest[static SHA512_DIGEST_LENGTH], SHA512_CTX *ctx)
   {
   
           /* Add padding */
           SHA512_Pad(ctx);
   
           /* Write the hash */
           be64enc_vect(digest, ctx->state, SHA512_DIGEST_LENGTH);
   
           /* Clear the context state */
           explicit_bzero(ctx, sizeof(*ctx));
   }
   
   /*** SHA-512t: *********************************************************/
   /*
    * the SHA512t transforms are identical to SHA512 so reuse the existing function
    */
   void
   SHA512_224_Init(SHA512_CTX * ctx)
   {
   
           /* Zero bits processed so far */
           ctx->count[0] = ctx->count[1] = 0;
   
           /* Magic initialization constants */
           ctx->state[0] = 0x8c3d37c819544da2ULL;
           ctx->state[1] = 0x73e1996689dcd4d6ULL;
           ctx->state[2] = 0x1dfab7ae32ff9c82ULL;
           ctx->state[3] = 0x679dd514582f9fcfULL;
           ctx->state[4] = 0x0f6d2b697bd44da8ULL;
           ctx->state[5] = 0x77e36f7304c48942ULL;
           ctx->state[6] = 0x3f9d85a86a1d36c8ULL;
           ctx->state[7] = 0x1112e6ad91d692a1ULL;
   }
   
   void
   SHA512_224_Update(SHA512_CTX * ctx, const void *in, size_t len)
   {
   
           SHA512_Update(ctx, in, len);
   }
   
   void
   SHA512_224_Final(unsigned char digest[static SHA512_224_DIGEST_LENGTH], SHA512_CTX * ctx)
   {
   
           /* Add padding */
           SHA512_Pad(ctx);
   
           /* Write the hash */
           be64enc_vect(digest, ctx->state, SHA512_224_DIGEST_LENGTH);
   
           /* Clear the context state */
           explicit_bzero(ctx, sizeof(*ctx));
   }
   
   void
   SHA512_256_Init(SHA512_CTX * ctx)
   {
   
           /* Zero bits processed so far */
           ctx->count[0] = ctx->count[1] = 0;
   
           /* Magic initialization constants */
           ctx->state[0] = 0x22312194fc2bf72cULL;
           ctx->state[1] = 0x9f555fa3c84c64c2ULL;
           ctx->state[2] = 0x2393b86b6f53b151ULL;
           ctx->state[3] = 0x963877195940eabdULL;
           ctx->state[4] = 0x96283ee2a88effe3ULL;
           ctx->state[5] = 0xbe5e1e2553863992ULL;
           ctx->state[6] = 0x2b0199fc2c85b8aaULL;
           ctx->state[7] = 0x0eb72ddc81c52ca2ULL;
   }
   
   void
   SHA512_256_Update(SHA512_CTX * ctx, const void *in, size_t len)
   {
   
           SHA512_Update(ctx, in, len);
   }
   
   void
   SHA512_256_Final(unsigned char digest[static SHA512_256_DIGEST_LENGTH], SHA512_CTX * ctx)
   {
   
           /* Add padding */
           SHA512_Pad(ctx);
   
           /* Write the hash */
           be64enc_vect(digest, ctx->state, SHA512_256_DIGEST_LENGTH);
   
           /* Clear the context state */
           explicit_bzero(ctx, sizeof(*ctx));
   }
   
   /*** SHA-384: *********************************************************/
   /*
    * the SHA384 and SHA512 transforms are identical, so SHA384 is skipped
    */
   
   /* SHA-384 initialization.  Begins a SHA-384 operation. */
   void
   SHA384_Init(SHA384_CTX * ctx)
   {
   
           /* Zero bits processed so far */
           ctx->count[0] = ctx->count[1] = 0;
   
           /* Magic initialization constants */
           ctx->state[0] = 0xcbbb9d5dc1059ed8ULL;
           ctx->state[1] = 0x629a292a367cd507ULL;
           ctx->state[2] = 0x9159015a3070dd17ULL;
           ctx->state[3] = 0x152fecd8f70e5939ULL;
           ctx->state[4] = 0x67332667ffc00b31ULL;
           ctx->state[5] = 0x8eb44a8768581511ULL;
           ctx->state[6] = 0xdb0c2e0d64f98fa7ULL;
           ctx->state[7] = 0x47b5481dbefa4fa4ULL;
   }
   
   /* Add bytes into the SHA-384 hash */
   void
   SHA384_Update(SHA384_CTX * ctx, const void *in, size_t len)
   {
   
           SHA512_Update((SHA512_CTX *)ctx, in, len);
   }
   
   /*
    * SHA-384 finalization.  Pads the input data, exports the hash value,
    * and clears the context state.
    */
   void
   SHA384_Final(unsigned char digest[static SHA384_DIGEST_LENGTH], SHA384_CTX *ctx)
   {
   
           /* Add padding */
           SHA512_Pad((SHA512_CTX *)ctx);
   
           /* Write the hash */
           be64enc_vect(digest, ctx->state, SHA384_DIGEST_LENGTH);
   
           /* Clear the context state */
           explicit_bzero(ctx, sizeof(*ctx));
   }
   
   #ifdef WEAK_REFS
   /* When building libmd, provide weak references. Note: this is not
      activated in the context of compiling these sources for internal
      use in libcrypt.
    */
   #undef SHA512_Init
   __weak_reference(_libmd_SHA512_Init, SHA512_Init);
   #undef SHA512_Update
   __weak_reference(_libmd_SHA512_Update, SHA512_Update);
   #undef SHA512_Final
   __weak_reference(_libmd_SHA512_Final, SHA512_Final);
   #undef SHA512_Transform
   __weak_reference(_libmd_SHA512_Transform, SHA512_Transform);
   
   #undef SHA512_224_Init
   __weak_reference(_libmd_SHA512_224_Init, SHA512_224_Init);
   #undef SHA512_224_Update
   __weak_reference(_libmd_SHA512_224_Update, SHA512_224_Update);
   #undef SHA512_224_Final
   __weak_reference(_libmd_SHA512_224_Final, SHA512_224_Final);
   
   #undef SHA512_256_Init
   __weak_reference(_libmd_SHA512_256_Init, SHA512_256_Init);
   #undef SHA512_256_Update
   __weak_reference(_libmd_SHA512_256_Update, SHA512_256_Update);
   #undef SHA512_256_Final
   __weak_reference(_libmd_SHA512_256_Final, SHA512_256_Final);
   
   #undef SHA384_Init
   __weak_reference(_libmd_SHA384_Init, SHA384_Init);
   #undef SHA384_Update
   __weak_reference(_libmd_SHA384_Update, SHA384_Update);
   #undef SHA384_Final
   __weak_reference(_libmd_SHA384_Final, SHA384_Final);
   #endif

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