SHA2-256Hashing and digest functions

SHA2-256 Hashing checking and HMAC Functions. More...

Functions
void	sha256sum2 (unsigned char *buff, const void *data, unsigned long len, const void *data2, unsigned long len2)
	Calculate the SHA2-256 hash accross 2 data chunks. More...
void	sha256sum (unsigned char *buff, const void *data, unsigned long len)
	Calculate the SHA2-256 hash. More...
int	sha256cmp (unsigned char *digest1, unsigned char *digest2)
	Compare two SHA2-256 hashes. More...
void	sha256hmac (unsigned char *buff, const void *data, unsigned long len, const void *key, unsigned long klen)
	Hash Message Authentication Codes (HMAC) SHA2-256. More...

Detailed Description

SHA2-256 Hashing checking and HMAC Functions.

Function Documentation

int sha256cmp	(	unsigned char *	digest1,
		unsigned char *	digest2
	)

Compare two SHA2-256 hashes.

Parameters

digest1	Digest to compare.
digest2	Digest to compare.

Returns

0 on equality.

Definition at line 243 of file util.c.

                                                                     {
    return (_digest_cmp(digest1, digest2, 32));
}

void sha256hmac	(	unsigned char *	buff,
		const void *	data,
		unsigned long	len,
		const void *	key,
		unsigned long	klen
	)

Hash Message Authentication Codes (HMAC) SHA2-256.

Parameters

buff	HMAC returned in this buffer (32 bytes).
data	Data to sign.
len	Length of data.
key	Key to signwith.
klen	Length of key.

Definition at line 314 of file util.c.

References sha256sum2().

                                                                                                                      {
    _hmac(buff, data, len, key, klen, sha256sum2, 32);
}

void sha256sum	(	unsigned char *	buff,
		const void *	data,
		unsigned long	len
	)

Calculate the SHA2-256 hash.

Parameters

buff	buffer to place the hash (32 bytes).
data	First data chunk to calculate.
len	Length of data.

Definition at line 144 of file util.c.

References sha256sum2().

                                                                                {
    sha256sum2(buff, data, len, NULL, 0);
}

void sha256sum2	(	unsigned char *	buff,
		const void *	data,
		unsigned long	len,
		const void *	data2,
		unsigned long	len2
	)

Calculate the SHA2-256 hash accross 2 data chunks.

Parameters

buff	buffer to place the hash (32 bytes).
data	First data chunk to calculate.
len	Length of data.
data2	Second data chunk to calculate.
len2	Length of data2.

Definition at line 127 of file util.c.

Referenced by sha256hmac(), and sha256sum().

                                                                                                                        {
    SHA256_CTX c;

    SHA256_Init(&c);
    SHA256_Update(&c, data, len);
    if (data2) {
        SHA256_Update(&c, data2, len2);
    }
    SHA256_Final(buff, &c);
}