bn: XML Security Library Reference Manual

## bn bn — Big numbers (BIGNUM) support functions implementation for OpenSSL. |

## Stability Level

Stable, unless otherwise indicated

## Functions

BIGNUM * | xmlSecOpenSSLNodeGetBNValue ()
int | xmlSecOpenSSLNodeSetBNValue ()

## Description

## Functions

### xmlSecOpenSSLNodeGetBNValue ()

    BIGNUM *
    xmlSecOpenSSLNodeGetBNValue (const xmlNodePtr cur,
                                 BIGNUM **a);

Converts the node content from CryptoBinary format (http://www.w3.org/TR/xmldsig-core/sec-CryptoBinary) to a BIGNUM. If no BIGNUM buffer provided then a new BIGNUM is created (caller is responsible for freeing it).

#### Parameters

cur | the pointer to an XML node. |
a | the BIGNUM buffer. |

#### Returns

a pointer to BIGNUM produced from CryptoBinary string or NULL if an error occurs.

### xmlSecOpenSSLNodeSetBNValue ()

    int
    xmlSecOpenSSLNodeSetBNValue (xmlNodePtr cur,
                                 const BIGNUM *a,
                                 int addLineBreaks);

Converts BIGNUM to CryptoBinary string (http://www.w3.org/TR/xmldsig-core/sec-CryptoBinary) and sets it as the content of the given node. If the addLineBreaks is set then line breaks are added before and after the CryptoBinary string.

#### Parameters

cur | the pointer to an XML node. |
a | the BIGNUM. |
addLineBreaks | if the flag is equal to 1 then linebreaks will be added before and after new buffer content. |

#### Returns

0 on success or -1 otherwise.

## Types and Values