util_verify

Verify a cryptographic signature

Behaviour

Verify a cryptographic signature

• If the public key is prefixed with 0xED then use ED25519
• Otherwise assume SECP256k1

Definition

C

int64_t util_verify (
    uint32_t dread_ptr,
    uint32_t dread_len,
    uint32_t sread_ptr,
    uint32_t sread_len,
    uint32_t kread_ptr,
    uint32_t kread_len
);

Example

C

if (!util_verify(payload_ptr,    payload_len,
                 signature_ptr,  signature_len,
                 publickey_ptr,  publickey_len))
	rollback("Invalid Signature", 17, 60);

Parameters

Name	Type	Description
dread_ptr	uint32_t	Pointer to the signed data
dread_len	uint32_t	Length of the signed data
sread_ptr	uint32_t	Pointer to the signature
sread_len	uint32_t	Length of the signature
kread_ptr	uint32_t	Pointer to the public key
kread_len	uint32_t	Length of the public key

Return Code

Type	Description
int64_t	0 - validation failed, the signature is invalid. 1 - validation succeeded, the signature is valid. If negative, an error: OUT_OF_BOUNDS - pointers/lengths specified outside of hook memory.