import { Fr } from '@aztec/foundation/curves/bn254';
/**
 * Formats a buffer as an array of fields. Splits the input into 31-byte chunks, and stores each
 * of them into a field, omitting the field's first byte, then adds zero-fields at the end until the max length.
 * @param input - Input to format.
 * @param targetLength - Length of the target array in number of fields.
 * @returns A field with the total length in bytes, followed by an array of fields such that their concatenation is equal to the input buffer, followed by enough zeroes to reach targetLength.
 */
export declare function bufferAsFields(input: Buffer, targetLength: number): Fr[];
/**
 * Recovers a buffer from an array of fields previously encoded with bufferAsFields.
 *
 * The first field encodes the byte length of the original buffer. The remaining fields
 * each carry 31 bytes of payload (the leading byte of each 32-byte field element is skipped).
 *
 * If the declared byte length exceeds the bytes available from the payload fields, the result
 * is zero-padded to the full declared length. This is important for correctness when the field
 * array has been truncated (e.g. contract class logs reconstructed from blobs using a short
 * emittedLength): without padding, the resulting buffer would be shorter than declared, causing
 * bytecode commitment computations to diverge from what the circuit produced.
 *
 * @param fields - An output from bufferAsFields: [byteLength, ...payloadFields].
 * @returns A buffer of exactly `byteLength` bytes.
 */
export declare function bufferFromFields(fields: Fr[]): Buffer;
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