bool aws_cryptosdk_frame_serialized()

in source/framefmt.c [249:271]

• 16 lines of code
• 11 McCabe index (conditional complexity)

bool aws_cryptosdk_frame_serialized(
    const struct aws_cryptosdk_frame *frame,
    const struct aws_cryptosdk_alg_properties *alg_props,
    size_t plaintext_size) {
    if (frame == NULL || alg_props == NULL) {
        return false;
    }

    // Check that both iv, authtag buffers contain the correct amount of bytes
    bool iv_size_valid  = (frame->iv.capacity == alg_props->iv_len);
    bool tag_size_valid = (frame->authtag.capacity == alg_props->tag_len);

    // Check that both iv, authtag buffers are empty and ready for writting
    bool iv_empty  = (frame->iv.len == 0);
    bool tag_empty = (frame->authtag.len == 0);

    // Check that the ciphertext buffer has the correct size
    bool ciphertext_size_valid = ((frame->type == FRAME_TYPE_SINGLE || frame->type == FRAME_TYPE_FRAME) &&
                                  frame->ciphertext.capacity == plaintext_size) ||
                                 (frame->type == FRAME_TYPE_FINAL && frame->ciphertext.capacity <= plaintext_size);

    return (ciphertext_size_valid && iv_empty && iv_size_valid && tag_empty && tag_size_valid);
}