Manual Pages for UNIX Operating System command usage for man BN_bn2bin

OpenSSL                                       BN_bn2bin(3openssl)



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     BN_bn2bin, BN_bin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn,
     BN_dec2bn, BN_print, BN_print_fp, BN_bn2mpi, BN_mpi2bn -
     format conversions

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      #include 

      int BN_bn2bin(const BIGNUM *a, unsigned char *to);
      BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret);

      char *BN_bn2hex(const BIGNUM *a);
      char *BN_bn2dec(const BIGNUM *a);
      int BN_hex2bn(BIGNUM **a, const char *str);
      int BN_dec2bn(BIGNUM **a, const char *str);

      int BN_print(BIO *fp, const BIGNUM *a);
      int BN_print_fp(FILE *fp, const BIGNUM *a);

      int BN_bn2mpi(const BIGNUM *a, unsigned char *to);
      BIGNUM *BN_mpi2bn(unsigned char *s, int len, BIGNUM *ret);


DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
     BN_bn2bin() converts the absolute value of aaaa into big-endian
     form and stores it at ttttoooo. ttttoooo must point to BN_num_bytes(aaaa)
     bytes of memory.

     BN_bin2bn() converts the positive integer in big-endian form
     of length lllleeeennnn at ssss into a BBBBIIIIGGGGNNNNUUUUMMMM and places it in rrrreeeetttt. If
     rrrreeeetttt is NULL, a new BBBBIIIIGGGGNNNNUUUUMMMM is created.

     BN_bn2hex() and BN_bn2dec() return printable strings
     containing the hexadecimal and decimal encoding of aaaa
     respectively. For negative numbers, the string is prefaced
     with a leading '-'. The string must be freed later using
     OPENSSL_free().

     BN_hex2bn() converts the string ssssttttrrrr containing a hexadecimal
     number to a BBBBIIIIGGGGNNNNUUUUMMMM and stores it in **bbbbnnnn. If *bbbbnnnn is NULL, a
     new BBBBIIIIGGGGNNNNUUUUMMMM is created. If bbbbnnnn is NULL, it only computes the
     number's length in hexadecimal digits. If the string starts
     with '-', the number is negative. BN_dec2bn() is the same
     using the decimal system.

     BN_print() and BN_print_fp() write the hexadecimal encoding
     of aaaa, with a leading '-' for negative numbers, to the BBBBIIIIOOOO or
     FFFFIIIILLLLEEEE ffffpppp.

     BN_bn2mpi() and BN_mpi2bn() convert BBBBIIIIGGGGNNNNUUUUMMMMs from and to a
     format that consists of the number's length in bytes
     represented as a 4-byte big-endian number, and the number



25/Sep/2002            Last change: 0.9.8o                      1






OpenSSL                                       BN_bn2bin(3openssl)



     itself in big-endian format, where the most significant bit
     signals a negative number (the representation of numbers
     with the MSB set is prefixed with null byte).

     BN_bn2mpi() stores the representation of aaaa at ttttoooo, where ttttoooo
     must be large enough to hold the result. The size can be
     determined by calling BN_bn2mpi(aaaa, NULL).

     BN_mpi2bn() converts the lllleeeennnn bytes long representation at ssss
     to a BBBBIIIIGGGGNNNNUUUUMMMM and stores it at rrrreeeetttt, or in a newly allocated
     BBBBIIIIGGGGNNNNUUUUMMMM if rrrreeeetttt is NULL.

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     BN_bn2bin() returns the length of the big-endian number
     placed at ttttoooo.  BN_bin2bn() returns the BBBBIIIIGGGGNNNNUUUUMMMM, NULL on
     error.

     BN_bn2hex() and BN_bn2dec() return a null-terminated string,
     or NULL on error. BN_hex2bn() and BN_dec2bn() return the
     number's length in hexadecimal or decimal digits, and 0 on
     error.

     BN_print_fp() and BN_print() return 1 on success, 0 on write
     errors.

     BN_bn2mpi() returns the length of the representation.
     BN_mpi2bn() returns the BBBBIIIIGGGGNNNNUUUUMMMM, and NULL on error.

     The error codes can be obtained by ERR_get_error(3).

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     bn(3), ERR_get_error(3), BN_zero(3), ASN1_INTEGER_to_BN(3),
     BN_num_bytes(3)

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     BN_bn2bin(), BN_bin2bn(), BN_print_fp() and BN_print() are
     available in all versions of SSLeay and OpenSSL.

     BN_bn2hex(), BN_bn2dec(), BN_hex2bn(), BN_dec2bn(),
     BN_bn2mpi() and BN_mpi2bn() were added in SSLeay 0.9.0.















25/Sep/2002            Last change: 0.9.8o                      2