Module blocks 

Fixed SHA-256 block builders for the performance-profile WOTS datapath.

Every builder returns sixteen already-decoded, big-endian SHA-256 words. There is no byte-order conversion left for a compression lane to infer. The builders are deliberately fixed-size: accepting an arbitrary byte stream in hardware would spend area on length and padding machinery that the HASHSIGS_SHA256_GENERIC_V1 protocol never exercises.

Structs

ChainBlockInput

Input to one randomized WOTS chain transition.

EndpointPairInput

Two adjacent 32-byte endpoints forming an ordinary public-key hash block.

PrfBlockInput

Input to the domain-separated PRF block builder.

SecretDataInput

Input to the 64-byte secret-segment first-block builder.

Constants

ENDPOINT_STREAM_BITS

Bit length of the concatenated 67 public-key endpoints.

ENDPOINT_STREAM_BYTES

Bytes in the concatenated 67 public-key endpoints.

HASH_BYTES

Bytes in one SHA-256 digest or WOTS segment.

HASH_INPUT_BITS

Bit length of the 32-byte fixed inputs.

PRF_INPUT_BITS

Bit length of 0x03 || seed || u16_be(index).

SECRET_INPUT_BITS

Bit length of a 64-byte secret-segment preimage.

SHA_BLOCK_BYTES

Bytes in one SHA-256 compression block.

Functions

bytes_to_words_be_kernel

Convert 64 explicitly ordered bytes to sixteen big-endian words.

chain_block_kernel

Build the padded 32-byte chain preimage state XOR mask.

endpoint_final_block_kernel

Build final public-key hash block 33 from endpoint 66 and fixed padding.

endpoint_pair_block_kernel

Build one ordinary, full data block from two adjacent endpoints.

hash_words_to_bytes_kernel

Convert eight SHA-256 words to their canonical 32-byte representation.

initial_state_words_kernel

Return the FIPS 180-4 SHA-256 initial chaining value in RHDL widths.

prf_block_kernel

Build 0x03 || seed || u16_be(index) plus SHA-256 padding.

private_seed_block_kernel

Build the padded block that hashes a caller-supplied private seed.

secret_data_block_kernel

Build the first, unpadded data block of function_key || secret_prf.

secret_padding_block_kernel

Build the fixed second padding block for every 64-byte secret preimage.

sha256_32_byte_block_kernel

Build the sole padded block for an arbitrary protocol-owned 32-byte value.

software_padded_block

Independently construct one SHA-256 padded byte block in software.

software_words_from_bytes

Convert a software byte block into SHA-256 big-endian words.

Type Aliases

HashBytes

Byte-oriented digest input used at WOTS context-storage boundaries.

HashWords

Eight big-endian SHA-256 chaining or digest words.

ShaBlock

Big-endian words presented to a SHA-256 compression lane.