util_sha512h

Compute an sha512-half over some data

Behaviour

C

• Compute an SHA512 hash over the data pointed to by read_ptr

• Write the first half of the hash to write_ptr

Javascript

• Compute an SHA512 hash over the data pointed to by data

• Return the first half of the hash

Definition

C

int64_t util_sha512h (
    uint32_t write_ptr,
    uint32_t write_len,
    uint32_t read_ptr,
    uint32_t read_len
);

Javascript

function util_sha512h(data: ByteArray | HexString): ErrorCode | ByteArray

Example

C

C

uint8_t hash_out[32];
if (util_sha512h(hash_out, 32, data_in_ptr, data_in_len) < 0)
	rollback("Could not generate Hash", 23, 1);

Javascript

if (util_sha512h(data) < 0)
    rollback("Could not generate Hash", 1)

Parameters

C

Name	Type	Description
write_ptr	uint32_t	Pointer to a buffer the hash will be written to
write_len	uint32_t	Length of output buffer, should be at least 32.
read_ptr	uint32_t	Pointer to the buffer data will be read from (to compute the hash over)
read_len	uint32_t	Length of input data

Javascript

Name	Type	Description
data	ByteArray or HexString	The data to compute the hash over, can be provided as an array of numbers or a string.

Return Code

C

Type	Description
int64_t	The number of bytes written, should always be 32. If negative, an error: OUT_OF_BOUNDS - pointers/lengths specified outside of hook memory. TOO_SMALL - Output buffer isn't large enough

Javascript

Type	Description
ByteArray	ErrorCode if there is an error in computing the hash, otherwise returns the SHA512-half hash as an array of numbers.