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#ifndef _PKCS7_PADDING_H_
#define _PKCS7_PADDING_H_
#include <stdint.h>
#include <stddef.h>
/* Pad a buffer with bytes as defined in PKCS#7
* Returns the number of pad bytes added, or zero if
* the buffer size is not large enough to hold the correctly padded data
*/
int pkcs7_padding_pad_buffer( uint8_t *buffer, size_t data_length, size_t buffer_size, uint8_t modulus );
int pkcs7_padding_valid( uint8_t *buffer, size_t data_length, size_t buffer_size, uint8_t modulus );
/* Given a block of pkcs7 padded data, return the actual data length in the block based on the padding applied.
* buffer_size must be a multiple of modulus
* last byte 'x' in buffer must be between 1 and modulus
* buffer_size must be at least x + 1 in size
* last 'x' bytes in buffer must be same as 'x'
* returned size will be buffer_size - 'x'
*/
size_t pkcs7_padding_data_length( uint8_t * buffer, size_t buffer_size, uint8_t modulus );
#endif
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