kcapi_aead_getdata_output - Man Page

get the pointers into output buffer

Synopsis

void kcapi_aead_getdata_output(struct kcapi_handle * handle, uint8_t * encdata, uint32_t encdatalen, int enc, uint8_t ** aad, uint32_t * aadlen, uint8_t ** data, uint32_t * datalen, uint8_t ** tag, uint32_t * taglen);

Arguments

handle

[in] cipher handle

encdata

[in] data buffer returned by the encryption operation

encdatalen

[in] size of the encryption data buffer

enc

[in] does output buffer hold encryption or decryption result?

aad

[out] AD buffer pointer; when set to NULL, no data pointer is returned; returned pointer may also be NULL

aadlen

[out] length of AD; when aad was set to NULL, no information is returned

data

[out] pointer to output buffer from AEAD encryption operation when set to NULL, no data pointer is returned

datalen

[out] length of data buffer; when data was set to NULL, no information is returned

tag

[out] tag buffer pointer; when set to NULL, no data pointer is returned; returned pointer may also be NULL

taglen

[out] length of tag; when tag was set to NULL, no information is returned

Description

This function is a service function to the consumer to locate the right ciphertext buffer offset holding the authentication tag. In addition, it provides the consumer with the length of the tag and the length of the ciphertext.

Author

Stephan Mueller <smueller@chronox.de>

Author.

Info

March 2021 libkcapi Manual 1.2.1 Programming Interface