Function Hacl_P256_ecdsa_sign_p256_without_hash

pub unsafe extern "C" fn Hacl_P256_ecdsa_sign_p256_without_hash(
    signature: *mut u8,
    msg_len: u32,
    msg: *mut u8,
    private_key: *mut u8,
    nonce: *mut u8,
) -> bool

Create an ECDSA signature WITHOUT hashing first.

This function is intended to receive a hash of the input. For convenience, we recommend using one of the hash-and-sign combined functions above.

The argument msg MUST be at least 32 bytes (i.e. msg_len >= 32).

NOTE: The equivalent functions in OpenSSL and Fiat-Crypto both accept inputs smaller than 32 bytes. These libraries left-pad the input with enough zeroes to reach the minimum 32 byte size. Clients who need behavior identical to OpenSSL need to perform the left-padding themselves.

The function returns true for successful creation of an ECDSA signature and false otherwise.

The outparam signature (R || S) points to 64 bytes of valid memory, i.e., uint8_t[64]. The argument msg points to msg_len bytes of valid memory, i.e., uint8_t[msg_len]. The arguments private_key and nonce point to 32 bytes of valid memory, i.e., uint8_t[32].

The function also checks whether private_key and nonce are valid values: • 0 < private_key < the order of the curve • 0 < nonce < the order of the curve