__sha1_block
__sha1_block(state, data, 1);
__sha1_block(ctx->state, ctx->buffer, 1);
__sha1_block(ctx->state, data, blocks);
__sha1_block(ctx->state, ctx->buffer, 1);
__sha1_block(ctx->state, ctx->buffer, 1);
void __sha1_block(uint32_t state[5], const uint8_t *in, size_t num);