sha256.c File Reference
`#include "common.h"`
`#include "sha256.h"`
`#include "crypto.h"`

## Functions

void | hmac_sha256_vector (const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
| hmac_sha256_vector - HMAC-SHA256 over data vector (RFC 2104) @key: Key for HMAC operations @key_len: Length of the key in bytes @num_elem: Number of elements in the data vector @addr: Pointers to the data areas @len: Lengths of the data blocks @mac: Buffer for the hash (32 bytes) More...
void | hmac_sha256 (const u8 *key, size_t key_len, const u8 *data, size_t data_len, u8 *mac)
| hmac_sha256 - HMAC-SHA256 over data buffer (RFC 2104) @key: Key for HMAC operations @key_len: Length of the key in bytes @data: Pointers to the data area @data_len: Length of the data area @mac: Buffer for the hash (20 bytes) More...
void | sha256_prf (const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf, size_t buf_len)
| sha256_prf - SHA256-based Pseudo-Random Function (IEEE 802.11r, 8.5.1.5.2) @key: Key for PRF @key_len: Length of the key in bytes @label: A unique label for each purpose of the PRF @data: Extra data to bind into the key @data_len: Length of the data @buf: Buffer for the generated pseudo-random key @buf_len: Number of bytes of key to generate More...

## Function Documentation

## hmac_sha256()

void hmac_sha256 | ( | const u8 * | key,
|  | size_t | key_len,
|  | const u8 * | data,
|  | size_t | data_len,
|  | u8 * | mac
| ) |  |

hmac_sha256 - HMAC-SHA256 over data buffer (RFC 2104) @key: Key for HMAC operations @key_len: Length of the key in bytes @data: Pointers to the data area @data_len: Length of the data area @mac: Buffer for the hash (20 bytes)

References data, and hmac_sha256_vector().

## hmac_sha256_vector()

void hmac_sha256_vector | ( | const u8 * | key,
|  | size_t | key_len,
|  | size_t | num_elem,
|  | const u8 * | addr[],
|  | const size_t * | len,
|  | u8 * | mac
| ) |  |

hmac_sha256_vector - HMAC-SHA256 over data vector (RFC 2104) @key: Key for HMAC operations @key_len: Length of the key in bytes @num_elem: Number of elements in the data vector @addr: Pointers to the data areas @len: Lengths of the data blocks @mac: Buffer for the hash (32 bytes)

References len, os_memcpy, os_memset, SHA256_MAC_LEN, and sha256_vector().

Referenced by hmac_sha256(), and sha256_prf().

## sha256_prf()

void sha256_prf | ( | const u8 * | key,
|  | size_t | key_len,
|  | const char * | label,
|  | const u8 * | data,
|  | size_t | data_len,
|  | u8 * | buf,
|  | size_t | buf_len
| ) |  |

sha256_prf - SHA256-based Pseudo-Random Function (IEEE 802.11r, 8.5.1.5.2) @key: Key for PRF @key_len: Length of the key in bytes @label: A unique label for each purpose of the PRF @data: Extra data to bind into the key @data_len: Length of the data @buf: Buffer for the generated pseudo-random key @buf_len: Number of bytes of key to generate

This function is used to derive new, cryptographically separate keys from a given key.

References data, hmac_sha256_vector(), len, os_memcpy, os_strlen, SHA256_MAC_LEN, and WPA_PUT_LE16.