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#ifndef OPENSSL_HEADER_DIGEST_MD32_COMMON_H

#define OPENSSL_HEADER_DIGEST_MD32_COMMON_H

#include <openssl/base.h>

#include <assert.h>

#include "../../internal.h"

#if defined(__cplusplus)

extern "C" {

#endif

// This is a generic 32-bit "collector" for message digest algorithms. It

// collects input character stream into chunks of 32-bit values and invokes the

// block function that performs the actual hash calculations.

//

// To make use of this mechanism, the hash context should be defined with the

// following parameters.

//

//     typedef struct <name>_state_st {

//       uint32_t h[<chaining length> / sizeof(uint32_t)];

//       uint32_t Nl, Nh;

//       uint8_t data[<block size>];

//       unsigned num;

//       ...

//     } <NAME>_CTX;

//

// <chaining length> is the output length of the hash in bytes, before

// any truncation (e.g. 64 for SHA-224 and SHA-256, 128 for SHA-384 and

// SHA-512).

//

// |h| is the hash state and is updated by a function of type

// |crypto_md32_block_func|. |data| is the partial unprocessed block and has

// |num| bytes. |Nl| and |Nh| maintain the number of bits processed so far.

// A crypto_md32_block_func should incorporate |num_blocks| of input from |data|

// into |state|. It is assumed the caller has sized |state| and |data| for the

// hash function.

typedef void (*crypto_md32_block_func)(uint32_t *state, const uint8_t *data,

                                       size_t num_blocks);

// crypto_md32_update adds |len| bytes from |in| to the digest. |data| must be a

// buffer of length |block_size| with the first |*num| bytes containing a

// partial block. This function combines the partial block with |in| and

// incorporates any complete blocks into the digest state |h|. It then updates

// |data| and |*num| with the new partial block and updates |*Nh| and |*Nl| with

// the data consumed.

static inline void crypto_md32_update(crypto_md32_block_func block_func,

                                      uint32_t *h, uint8_t *data,

                                      size_t block_size, unsigned *num,

                                      uint32_t *Nh, uint32_t *Nl,

                                      const uint8_t *in, size_t len) {

  if (len == 0) {

    return;

  }

  uint32_t l = *Nl + (((uint32_t)len) << 3);

  if (l < *Nl) {

    // Handle carries.

    (*Nh)++;

  }

  *Nh += (uint32_t)(len >> 29);

  *Nl = l;

  size_t n = *num;

  if (n != 0) {

    if (len >= block_size || len + n >= block_size) {

      OPENSSL_memcpy(data + n, in, block_size - n);

      block_func(h, data, 1);

      n = block_size - n;

      in += n;

      len -= n;

      *num = 0;

      // Keep |data| zeroed when unused.

      OPENSSL_memset(data, 0, block_size);

    } else {

      OPENSSL_memcpy(data + n, in, len);

      *num += (unsigned)len;

      return;

    }

  }

  n = len / block_size;

  if (n > 0) {

    block_func(h, in, n);

    n *= block_size;

    in += n;

    len -= n;

  }

  if (len != 0) {

    *num = (unsigned)len;

    OPENSSL_memcpy(data, in, len);

  }

}

Unexecuted instantiation: bcm.c:crypto_md32_update

Unexecuted instantiation: md5.c:crypto_md32_update

Unexecuted instantiation: md4.c:crypto_md32_update

// crypto_md32_final incorporates the partial block and trailing length into the

// digest state |h|. The trailing length is encoded in little-endian if

// |is_big_endian| is zero and big-endian otherwise. |data| must be a buffer of

// length |block_size| with the first |*num| bytes containing a partial block.

// |Nh| and |Nl| contain the total number of bits processed. On return, this

// function clears the partial block in |data| and

// |*num|.

//

// This function does not serialize |h| into a final digest. This is the

// responsibility of the caller.

static inline void crypto_md32_final(crypto_md32_block_func block_func,

                                     uint32_t *h, uint8_t *data,

                                     size_t block_size, unsigned *num,

                                     uint32_t Nh, uint32_t Nl,

                                     int is_big_endian) {

  // |data| always has room for at least one byte. A full block would have

  // been consumed.

  size_t n = *num;

  assert(n < block_size);

  data[n] = 0x80;

  n++;

  // Fill the block with zeros if there isn't room for a 64-bit length.

  if (n > block_size - 8) {

    OPENSSL_memset(data + n, 0, block_size - n);

    n = 0;

    block_func(h, data, 1);

  }

  OPENSSL_memset(data + n, 0, block_size - 8 - n);

  // Append a 64-bit length to the block and process it.

  if (is_big_endian) {

    CRYPTO_store_u32_be(data + block_size - 8, Nh);

    CRYPTO_store_u32_be(data + block_size - 4, Nl);

  } else {

    CRYPTO_store_u32_le(data + block_size - 8, Nl);

    CRYPTO_store_u32_le(data + block_size - 4, Nh);

  }

  block_func(h, data, 1);

  *num = 0;

  OPENSSL_memset(data, 0, block_size);

}

Unexecuted instantiation: bcm.c:crypto_md32_final

Unexecuted instantiation: md5.c:crypto_md32_final

Unexecuted instantiation: md4.c:crypto_md32_final

#if defined(__cplusplus)

}  // extern C

#endif

#endif  // OPENSSL_HEADER_DIGEST_MD32_COMMON_H