Hash

Hashing functions. More...

Functions
void	hmac256 (const uint8_t *data, size_t length, const uint8_t *key, size_t key_length, uint8_t hmac_hash[32])
	Implement HMAC algorithm.
void	md5::init_hash (uint32_t h[4])
	Initialize MD5 hash.
void	md5::md5_stream (uint32_t hash[4], const uint8_t data[], uint64_t length)
	MD5 hash calculation, streaming version: hash is updated with new hash at each call.
void	md5::hash_to_text (uint32_t hash[4], char *text)
	Print hash code to text.
void	md5::print_hash (uint32_t hash[4])
	Print hash code to stdout.
void	sha256::init_hash (uint32_t hash[8])
	Initialize SHA256 hash.
void	sha256::sha256 (const uint8_t data[], size_t length, uint32_t hash[8])
	Return SHA256 hash.
void	sha256::sha256_next (const uint8_t data[], uint32_t length, uint32_t hash[8], size_t total_length, uint8_t *tmpbuf)
	Compute SHA256 hash of chunks of data, using preallocated temporary buffer to store padded data.
void	sha256::sha256_stream (uint32_t hash[8], const uint8_t data[], uint64_t length)
	Compute SHA256 hash, updating hash value at every invocation.
void	sha256::to_little (uint32_t hash[8])
	Convert hash value to little endian.
void	sha256::hash_to_text (uint32_t hash[8], char *text)
	Convert SHA256 hash to text.
void	sha256::print_hash (uint32_t hash[8])
	Print SHA256 hash to standard output.

Detailed Description

Hashing functions.

Function Documentation

hash_to_text() [1/2]

void md5::hash_to_text ( uint32_t  hash[4], char *  text  )

inline

Print hash code to text.

Parameters

[in]	hash	hash code
[out]	text	null-terminated out buffer

hash_to_text() [2/2]

void sha256::hash_to_text ( uint32_t  hash[8], char *  text  )

inline

Convert SHA256 hash to text.

Parameters

[in]	hash	SHA256 hash
[out]	text	null-terminated output string

hmac256()

void hmac256	(	const uint8_t *	data,
		size_t	length,
		const uint8_t *	key,
		size_t	key_length,
		uint8_t	hmac_hash[32]
	)

Implement HMAC algorithm.

Parameters

[in]	data	pointer to data to sign
[in]	length	size of data buffer
[in]	key	key
[in]	key_length	key size, if smaller than 64 then a new 64 byte key is generated
[out]	hmac_hash	computed HMAC hash

References alloc_padded(), sha256::init_hash(), sha256::sha256(), sha256::sha256_stream(), and sha256::to_little().

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init_hash() [1/2]

void md5::init_hash ( uint32_t  h[4] )

inline

Initialize MD5 hash.

Parameters

[out]

h

hash code

init_hash() [2/2]

void sha256::init_hash ( uint32_t  hash[8] )

inline

Initialize SHA256 hash.

First 32 bits of the fractional parts of the square roots of the first 8 primes 2..19

Parameters

[out]

hash

returned hash code

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md5_stream()

void md5::md5_stream	(	uint32_t	hash[4],
		const uint8_t	data[],
		uint64_t	length
	)

MD5 hash calculation, streaming version: hash is updated with new hash at each call.

Parameters

[in,out]	MD5	hash updated at each call, initialize with init_hash
[in]	data	data to hash
[in]	length	size of data buffer

print_hash() [1/2]

void md5::print_hash

(

uint32_t

hash[4]

)

Print hash code to stdout.

Parameters

[in]

hash

hash code

print_hash() [2/2]

void sha256::print_hash

(

uint32_t

hash[8]

)

Print SHA256 hash to standard output.

Parameters

[in]

hash

SHA256 hash

sha256()

void sha256::sha256	(	const uint8_t	data[],
		size_t	length,
		uint32_t	hash[8]
	)

Return SHA256 hash.

Parameters

[in]	data	data to hash
[in]	length	size of data buffer
[out]	hash	returned hash value

References alloc_padded(), sha256::init_hash(), next_div_by(), sha256::sha256(), sha256::sha256_stream(), and sha256::to_little().

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sha256_next()

void sha256::sha256_next	(	const uint8_t	data[],
		uint32_t	length,
		uint32_t	hash[8],
		size_t	total_length,
		uint8_t *	tmpbuf
	)

Compute SHA256 hash of chunks of data, using preallocated temporary buffer to store padded data.

The SHA256 algorithm requires the total size of the hashed data to be added to the data itself as the last 8 bytes of the input buffer. When encoding the intermediate chunks length contains the size of the chunk and total_length can be either zero or equal to length. When encoding the last chunk, length needs to be equal to the chunk size and total_length equal to the total length of the buffer i.e. the sum of the sizes of the individual chunks.

Parameters

[in]	data	data to hash
[in]	length	size of chunk
[in,out]	hash	SHA256 hash
[in]	total_length	total length of data buffer

References alloc_padded(), and sha256::sha256_stream().

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sha256_stream()

void sha256::sha256_stream	(	uint32_t	hash[8],
		const uint8_t	data[],
		uint64_t	length
	)

Compute SHA256 hash, updating hash value at every invocation.

Parameters

[in,out]	hash	SH256 hash
[in]	data	data to hash
[in]	length	size of data buffer

References lshift(), and right_rotate().

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to_little()

void sha256::to_little ( uint32_t  hash[8] )

inline

Convert hash value to little endian.

Parameters

[in,out]

hash

SHA256 hash

References to_little_endian().

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