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BN_CTX_start (3)
  • >> BN_CTX_start (3) ( Разные man: Библиотечные вызовы )
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    NAME

    BN_CTX_start, BN_CTX_get, BN_CTX_end - use temporary BIGNUM variables
     
    

    SYNOPSIS

     #include <openssl/bn.h>
    
    

     void BN_CTX_start(BN_CTX *ctx);
    
    

     BIGNUM *BN_CTX_get(BN_CTX *ctx);
    
    

     void BN_CTX_end(BN_CTX *ctx);
    
    
     

    DESCRIPTION

    These functions are used to obtain temporary BIGNUM variables from a BN_CTX (which can been created by using BN_CTX_new(3)) in order to save the overhead of repeatedly creating and freeing BIGNUMs in functions that are called from inside a loop.

    A function must call BN_CTX_start() first. Then, BN_CTX_get() may be called repeatedly to obtain temporary BIGNUMs. All BN_CTX_get() calls must be made before calling any other functions that use the ctx as an argument.

    Finally, BN_CTX_end() must be called before returning from the function. When BN_CTX_end() is called, the BIGNUM pointers obtained from BN_CTX_get() become invalid.  

    RETURN VALUES

    BN_CTX_start() and BN_CTX_end() return no values.

    BN_CTX_get() returns a pointer to the BIGNUM, or NULL on error. Once BN_CTX_get() has failed, the subsequent calls will return NULL as well, so it is sufficient to check the return value of the last BN_CTX_get() call. In case of an error, an error code is set, which can be obtained by ERR_get_error(3).  

    SEE ALSO

    BN_CTX_new(3)  

    HISTORY

    BN_CTX_start(), BN_CTX_get() and BN_CTX_end() were added in OpenSSL 0.9.5.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    SEE ALSO
    HISTORY


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