hook_hash

Retreive the 32 byte namespace biased SHA512H of the currently executing Hook

Behaviour

• Look up the hash of the hook installed on hook account at position hook_no
• Write the 32 byte hash to write_ptr

Definition

C

int64_t hook_hash (
    uint32_t write_ptr,
    uint32_t write_len,
  	int32_t  hook_no
);

Example

C

uint8_t hash[32];
int64_t bytes_written = 
    hook_hash(hash, 32, -1);

Parameters

Name	Type	Description
write_ptr	uint32_t	Pointer to a buffer of a suitable size to store the output. Should be at least 32 bytes.
write_len	uint32_t	Length of the output buffer.
hook_no	int32_t	The position in the hook chain the hook is located at, or -1 for the currently executing hook.

Return Code

Type	Description
int64_t	The number of bytes written If negative, an error: OUT_OF_BOUNDS - pointers/lengths specified outside of hook memory. DOESNT_EXIST - The specified hook sequence number doesn't exist in the hook chain.