87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
|
|
/** @file
|
|
*
|
|
* @defgroup sha256 SHA-256 hash library
|
|
* @{
|
|
* @ingroup app_common
|
|
*
|
|
* @brief This module calculates SHA-256 (SHA-2, FIPS-180) hashes.
|
|
*
|
|
* @details To use this module, first call @ref sha256_init on a @ref sha256_context_t instance. Then call @ref
|
|
* sha256_update with the data to be hashed. This step can optionally be done with multiple
|
|
* calls to @ref sha256_update, each with a section of the data (in the correct order).
|
|
* After all data has been passed to @ref sha256_update, call @ref sha256_final to finalize
|
|
* and extract the hash value.
|
|
*
|
|
* This code is adapted from code by Brad Conte, retrieved from
|
|
* https://github.com/B-Con/crypto-algorithms.
|
|
*
|
|
*/
|
|
|
|
#ifndef SHA256_H
|
|
#define SHA256_H
|
|
|
|
|
|
#include <stdint.h>
|
|
|
|
#define SHA256_DIGEST_SIZE 32
|
|
|
|
/**@brief Current state of a hash operation.
|
|
*/
|
|
typedef struct {
|
|
uint64_t count;
|
|
union {
|
|
uint8_t buf[64];
|
|
uint32_t buf32[64 / 4];
|
|
};
|
|
uint32_t state[8]; // upto SHA2
|
|
}SHA256_CTX;
|
|
|
|
/**@brief Function for initializing a @ref sha256_context_t instance.
|
|
*
|
|
* @param[out] ctx Context instance to be initialized.
|
|
*
|
|
* @retval BES_SUCCESS If the instance was successfully initialized.
|
|
* @retval BES_ERROR_NULL If the parameter was NULL.
|
|
*/
|
|
uint32_t _sha256_init(SHA256_CTX *ctx);
|
|
|
|
/**@brief Function for calculating the hash of an array of uint8_t data.
|
|
*
|
|
* @details This function can be called multiple times in sequence. This is equivalent to calling
|
|
* the function once on a concatenation of the data from the different calls.
|
|
*
|
|
* @param[in,out] ctx Hash instance.
|
|
* @param[in] data Data to be hashed.
|
|
* @param[in] len Length of the data to be hashed.
|
|
*
|
|
* @retval BES_SUCCESS If the data was successfully hashed.
|
|
* @retval BES_ERROR_NULL If the ctx parameter was NULL or the data parameter was NULL, while the len parameter was not zero.
|
|
*/
|
|
uint32_t _sha256_update(SHA256_CTX *ctx, const uint8_t * data, uint32_t len);
|
|
|
|
/**@brief Function for extracting the hash value from a hash instance.
|
|
*
|
|
* @details This function should be called after all data to be hashed has been passed to the hash
|
|
* instance (by one or more calls to @ref sha256_update).
|
|
*
|
|
* Do not call @ref sha256_update again after @ref sha256_final has been called.
|
|
*
|
|
* @param[in,out] ctx Hash instance.
|
|
* @param[out] hash Array to hold the extracted hash value (assumed to be 32 bytes long).
|
|
* @param[in] le Store the hash in little-endian.
|
|
*
|
|
* @retval BES_SUCCESS If the has value was successfully extracted.
|
|
* @retval BES_ERROR_NULL If a parameter was NULL.
|
|
*/
|
|
uint32_t _sha256_final(SHA256_CTX *ctx, uint8_t * hash, uint8_t le);
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif // SHA256_H
|
|
|
|
/** @} */
|